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Accession number:20211110075432

Title:Investigation on secondary electron emission characteristics of double-layer structures

Authors:Wang, Dan (1); He, Yongning (1); Guo, Junjiang (2, 3, 4); Cai, Yahui (1); Mao, Zhangsong (1); Ye, Ming (1)

Author affiliation:(1) School of Microelectronics, Xian Jiaotong University, Xian; 710049, China; (2) State Key Laboratory of Transient Optics and Photonics, Xian Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xian; 710119, China; (3) Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Shaanxi Key Lab of Information Photonic Technique, School of Electronics and Information Engineering, Xian Jiaotong University, Xian; 710049, China; (4) University of Chinese Academy of Sciences (UCAS), Beijing; 100049, China

Corresponding author:He, Yongning(yongning@mail.xjtu.edu.cn)

Source title:Journal of Applied Physics

Abbreviated source title:J Appl Phys

Volume:129

Issue:9

Issue date:March 7, 2021

Publication year:2021

Article number:093304

Language:English

ISSN:00218979

E-ISSN:10897550

CODEN:JAPIAU

Document type:Journal article (JA)

Publisher:American Institute of Physics Inc.

Abstract:Secondary electron (SE) emission (SEE) from material surfaces is a frequent phenomenon in space and vacuum environments. SEE modulation is important since it governs the performance of some devices such as electronic multipliers or induces some detrimental effects such as multipactors. Surface coating has been reported to modulate SEE effectively, whereas SEE behaviors of coating structures are not clearly understood yet, and the appropriate theory to describe SEE characteristics quantitatively for coating structures is less developed so far. Here, we have prepared four alumina coatings possessing various thicknesses to research the SEE characteristics of coating structures and have shown how the coating thickness affects the SEE behaviors. Besides, by considering coating/substrate as an ideal double-layer structure, we have derived several equations to describe the producing, transmitting, and escaping processes of excited inner SEs and finally constructed a unidimensional SEE model for double-layer structures. The model is applicable to reveal the dependence of trueSE yield (TSEY) on the top and bottom layers' physical properties and estimate TSEY proportions contributed by the top and bottom layers at random energy points. By employing the concept, SEE characteristics of Al2O3/Si, MgO/Si, and TiO2/Si double-layer structureshave been quantitatively interpreted. Moreover, the abnormal SEY curve with a double-hump shape, which is induced by the peak position distinction of SiO2/Si structures, can also be explained. This work is of great significance to comprehend TSEY modulating regularities of various double-layer structures applied in surface engineering.<br/> © 2021 Author(s).

Number of references:31

Main heading:Magnesia

Controlled terms:Coatings - Titanium dioxide - Alumina - Silica - Secondary emission - Thickness measurement - Silicon - Aluminum oxide

Uncontrolled terms:Coating structures - Coating thickness - Double layer structure - Secondary electron emissions - Secondary electrons - Surface coatings - Surface engineering - Vacuum environment

Classification code:549.3 Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals - 804.2 Inorganic Compounds - 813.2 Coating Materials - 943.2 Mechanical Variables Measurements

DOI:10.1063/5.0023325

Database:Compendex

Accession number:20215111372727

Title:Optimization of the epitaxial structure of low-loss 885nm high-power laser diodes

Authors:Wu, Shun-Hua (1, 2); Li, Te (2); Wang, Dan (2); Yu, Xue-Cheng (2); Wang, Zhen-Fu (2); Liu, Guo-Jun (1)

Author affiliation:(1) State Key Laboratory of High Power Semiconductor Laser, Changchun University of Science and Technology, Jilin, Changchun; 130022, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Shannxi, Xi'an; 710119, China

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11907

Part number:1 of 1

Issue title:Sixteenth National Conference on Laser Technology and Optoelectronics

Issue date:2021

Publication year:2021

Article number:1190714

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510646636

Document type:Conference article (CA)

Conference name:16th National Conference on Laser Technology and Optoelectronics

Conference date:June 3, 2021 - June 6, 2021

Conference location:Shanghai, China

Conference code:175236

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">Aiming at the epitaxial structure of the high-power 885nm laser diodes, the factors limiting the further increase of the output power and the power conversion efficiency were investigated. According to the analysis, the epitaxial structure of the laser diodes was optimized, and the influence of the waveguide layer thickness on the carrier absorption loss and the series resistance was theoretically simulated. The results showed that the asymmetric waveguide structure with the thickness ratio of the N-side and the P-side of 6:4 can reduce the carrier absorption loss to the greatest extent. Based on the simulation results, the 885nm laser bars with the optimized epitaxial structure were fabricated and tested under the ambient temperature of 25 in a quasi-continuous wave mode of 250μs and 200Hz. The slope efficiency reaches 1.26W/A, while the series resistance is only 1.2mω. The power of 277.6W is achieved at 250A injection current and the maximum power conversion efficiency exceeds 64%.<br/></div> © 2021 SPIE.

Number of references:23

Main heading:Diodes

Controlled terms:Waveguides - Conversion efficiency - Epitaxial growth - Electric resistance - High power lasers

Uncontrolled terms:885nm - Absorption loss - Asymmetric waveguides - Carrier absorption - Epitaxial structure - High power - High power conversion - High power conversion efficiency - Low-loss - Power conversion efficiencies

Classification code:525.5 Energy Conversion Issues - 701.1 Electricity: Basic Concepts and Phenomena - 714.3 Waveguides - 744.1 Lasers, General - 802.3 Chemical Operations - 933.1.2 Crystal Growth

Numerical data indexing:Electric current 2.50E+02A, Frequency 2.00E+02Hz, Percentage 6.40E+01%, Power 1.26E+00W, Power 2.776E+02W, Size 6.35E-01m, Size 8.85E-07m, Time 2.50E-04s

DOI:10.1117/12.2602879

Funding details: Number: 61504167, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2015JQ6263,2018JM6010, Acronym: -, Sponsor: Natural Science Foundation of Shanxi Province;

Funding text:This work was supported by the National Natural Science Foundation of China (Grant No.61504167), the Natural Science Foundation of Shannxi Province, China(Grant Nos.2019ZY-CXPT-03-05, 2018JM6010, 2015JQ6263) and the Talent Project of Science and Technology Department of Shannxi Province (No.2017KJXX-72).

Database:Compendex

Accession number:20215011329574

Title:Optical separation and discrimination of chiral particles by vector beams with orbital angular momentum (Open Access)

Authors:Li, Manman (1); Yan, Shaohui (1); Zhang, Yanan (1); Chen, Xu (1); Yao, Baoli (1, 2)

Corresponding author:Yao, Baoli(yaobl@opt.ac.cn)

Source title:Nanoscale Advances

Abbreviated source title:Nanoscale Adv.

Volume:3

Issue:24

Issue date:December 21, 2021

Publication year:2021

Pages:6897-6902

Language:English

E-ISSN:25160230

Document type:Journal article (JA)

Publisher:Royal Society of Chemistry

Abstract:<div data-language="eng" data-ev-field="abstract">Chirality describes a reduced symmetry and abounds in nature. The handedness-dependent response usually occurs only when a chiral object interacts with another chiral entity. Light carrying orbital angular momentum (OAM) is inherently chiral due to the helical wave front. Here, we put forward a scheme that enables optical separation and simultaneous discrimination of single chiral particles using focused vector beams with OAM. Such focused vector vortex beams carrying radial-splitting optical chirality can selectively trap one enantiomer inside or outside the intensity maxima depending on the sign of the OAM. The particles with different chirality parameters can be trapped on different orbits and experience enhanced orbital motion. Moreover, the magnitude of OAM as well as the size of particle plays an important role in the chiral separation and discrimination. In addition to particle manipulation, the discussion of OAM in chiral light-matter interactions has potential application in, for example, optical enantioseparation or chiral detection. This journal is<br/></div> © The Royal Society of Chemistry.

Number of references:45

Main heading:Chirality

Controlled terms:Wavefronts - Separation - Angular momentum

Uncontrolled terms:Chiral discrimination - Chiral particles - Helical wave fronts - Optical chirality - Optical separation - Orbital angular momentum - Orbital motions - Radial splitting - Vector beams - Vector-vortex beams

Classification code:802.3 Chemical Operations - 931.3 Atomic and Molecular Physics

DOI:10.1039/d1na00530h

Funding details: Number: 11904395,11974417, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: ZDBS-LY-JSC035, Acronym: CAS, Sponsor: Chinese Academy of Sciences;

Funding text:This research is supported by the Natural Science Foundation of China (NSFC) under Grant Nos 11904395 and 11974417, and the Key Research Program of Frontier Sciences, CAS, Grant No. ZDBS-LY-JSC035.

Database:Compendex

Open Access type(s): All Open Access, Gold, Green

Accession number:20210509874631

Title:Optical system design of polarization imaging spectrometer based on aperture division

Authors:Chang, Lingying (1); Pan, Qian (1); Qiu, Yuehong (2); Zhao, Baochang (2)

Author affiliation:(1) Xi'an University of Post and Telecommunications, Xian; 710121, China; (2) Xian Institute Optics and Precision Mechanics, Chinese Academy of Sciences, Xian; 710119, China

Corresponding author:Chang, Lingying(sophia_chang@126.com)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11761

Part number:1 of 1

Issue title:Fourth International Conference on Photonics and Optical Engineering

Issue date:2021

Publication year:2021

Article number:117611K

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510643574

Document type:Conference article (CA)

Conference name:4th International Conference on Photonics and Optical Engineering

Conference date:October 15, 2020 - October 16, 2020

Conference location:Xi'an, China

Conference code:166676

Sponsor:Chinese Optical Society; High-speed Photography and Photonics Committee of Chinese Optical Society; Optics and Photonics Society of Singapore; Shaanxi Optical Society; The Society of Photo-Optical Instrumentation Engineers (SPIE)

Publisher:SPIE

Abstract:Based on the principle of acousto-optic tunable filter and aperture division, the new method that can obtain a high spectral full polarization and image information was proposed. It was improved the accuracy of target detection and object recognition by this method. The Optical system of polarization imaging spectrometer based on aperture divisionandacousto-optic tunable filter was designed in this paper, which was used in the 2.16-meter telescope and spectral range is 450-900 nm.First,the working principle of polarization imaging spectrometer based on aperture division was introduced.Then, the design scheme of optical system and the principle of information acquisition were studied.Finally, the design parameters were assigned and theoptical systems were designed.The whole system MTF reach 0.6 in 32lp/mm.The olarization imaging spectrometer based on aperture division can improve the observation capacity.<br/> © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

Number of references:12

Main heading:Optical systems

Controlled terms:Object detection - Spectrometers - Optical design - Polarization - Bandpass filters - Object recognition

Uncontrolled terms:Acousto-optic tunable filters - Design parameters - Full polarization - Image information - Imaging spectrometers - Information acquisitions - Polarization imaging - Tunable filters

Classification code:703.2 Electric Filters - 723.2 Data Processing and Image Processing - 741.1 Light/Optics - 741.3 Optical Devices and Systems

Numerical data indexing:Size 2.16e+00m

DOI:10.1117/12.2586810

Funding details: Number: 61475190, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:Project supported by National Natural Science Foundation of China(Grant No.61475190)

Database:Compendex

Accession number:20204409417426

Title:Analysis of corrected Cerenkov emission during electron radiotherapy by Monte Carlo method

Authors:Li, Yi (1, 2, 4); Liu, Hongjun (1, 3); Huang, Nan (1); Wang, Zhaolu (1); Zhang, Chunmin (2)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) School of Physics, Xi'an Jiaotong University, Xi'an; 710049, China; (3) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China; (4) University of Chinese Academy of Science, Beijing; 100084, China

Corresponding authors:Liu, Hongjun(liuhongjun@opt.ac.cn); Zhang, Chunmin(zcm@xjtu.edu.cn)

Source title:Applied Radiation and Isotopes

Abbreviated source title:Appl. Radiat. Isot.

Volume:168

Issue date:February 2021

Publication year:2021

Article number:109481

Language:English

ISSN:09698043

E-ISSN:18729800

CODEN:ARISEF

Document type:Journal article (JA)

Publisher:Elsevier Ltd

Abstract:Cerenkov emission during electron radiotherapy had been emerging as a new dose assessment approach for clinical radiotherapy and could be imaged through a standard commercial camera. The purpose of this work aimed to study the accuracy of corrected Cerenkov emission method during electron radiotherapy by Monte Carlo (MC) method. GAMOS MC software was used to model the physics of electron therapy and calculated dose and Cerenkov photon distribution in water phantom. Compared to ionization chamber and diode measurement, MC simulated dose discrepancy was less than 1% in percentage depth dose (PDD) curves and less than. 2% in crossline profile curves, which was acceptable for clinical criterion. Compared to ionization chamber dose measurement, MC simulated Cerenkov discrepancy was less than 2% in crossline profile distribution, which was acceptable for clinical criterion. However, the Cerenkov PDD curves tended to overestimate the dose at the build-up region and underestimate the dose at the remaining attenuation region. After increasing the Cerenkov distribution depth to 2–3 mm, the discrepancy became well within 1% at the remaining attenuation region, which was acceptable for clinical criterion. Therefore, corrected Cerenkov emission could be used to assess PDD accuracy and crossline profile accuracy during electron radiotherapy.<br/> © 2020 Elsevier Ltd

Number of references:27

Main heading:Radiotherapy

Controlled terms:Electrons - Monte Carlo methods - Electron emission - Ionization chambers

Uncontrolled terms:Cerenkov photons - Clinical radiotherapy - Diode measurements - Dose assessments - Dose measurement - Emission method - Profile accuracies - Profile distributions

Classification code:461.6 Medicine and Pharmacology - 622.3 Radioactive Material Applications - 922.2 Mathematical Statistics

Numerical data indexing:Percentage 1.00e+00%, Percentage 2.00e+00%

DOI:10.1016/j.apradiso.2020.109481

Funding details: Number: 41530422,QNLM2016ORP0111, Acronym: -, Sponsor: -;Number: 11604377,61775234,61975232, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2012AA121101, Acronym: -, Sponsor: National High-tech Research and Development Program;

Funding text:This work was supported by following financial programs. The National Natural Science Foundation of China ( 61975232 , 61775234 , 11604377 ), Qingdao National Laboratory supported this work for Marine Science and Technology of China ( QNLM2016ORP0111 ), The Key Program of National Natural Science Foundation of China ( 41530422 ), National High Technology Research and Development Program of China (Program 863) ( 2012AA121101 ). We thank Varian Company for providing machine information.This work was supported by following financial programs. The National Natural Science Foundation of China (61975232, 61775234, 11604377), Qingdao National Laboratory supported this work for Marine Science and Technology of China (QNLM2016ORP0111), The Key Program of National Natural Science Foundation of China (41530422), National High Technology Research and Development Program of China (Program 863) (2012AA121101). We thank Varian Company for providing machine information. All authors in this study and many colleagues helped to collect and analyze data. Their support and helps should be appreciated.

Database:Compendex

Accession number:20204709521265

Title:The mutual influence between rare earth element doping and femtosecond laser-induced effects in Ga-As-Sb-S chalcogenide glass

Authors:Liu, Lutao (1, 2); Chen, Fengyi (3); Cui, Jian (1, 2); Xiao, Xusheng (1); Xu, Yantao (1, 2); Hou, Chaoqi (1, 2); Cui, Xiaoxia (1, 2); Guo, Haitao (1, 2, 4)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences (CAS), Xi'an; Shaanxi; 710119, China; (2) Centre for Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences (UCAS), Beijing; 100049, China; (3) School of Physics, Northwest University, Xi'an; Shaanxi; 710069, China; (4) Collaborative Innovation Centre of Extreme Optics, Shanxi University, Taiyuan; Shanxi; 030006, China

Corresponding author:Guo, Haitao(guoht_001@opt.ac.cn)

Source title:Ceramics International

Abbreviated source title:Ceram Int

Volume:47

Issue:5

Issue date:March 1, 2021

Publication year:2021

Pages:6388-6396

Language:English

ISSN:02728842

CODEN:CINNDH

Document type:Journal article (JA)

Publisher:Elsevier Ltd

Abstract:Femtosecond laser-induced damage thresholds (LIDTs) of Ga<inf>0.8</inf>As<inf>29.2</inf>Sb<inf>10</inf>S<inf>60</inf> glasses doped with gradient Tm<sup>3+</sup> concentrations and the effects of laser-induced damage on the glass' luminescence properties were studied in this work. Tm<sup>3+</sup> doping in the glass considerably decreased the LIDT, from 3394.8 to 1881.8 mJ/cm<sup>2</sup>, when the Tm<sup>3+</sup> concentration increased from 0 to 5000 ppmw. This was related to the absorption of Tm<sup>3+</sup> around the femtosecond laser's wavelength and microstructural changes caused by the Tm<sup>3+</sup> doping. On the other hand, the femtosecond laser changed the glass matrix's elemental distribution and microstructure. Although the laser damaged the glass, the luminescence properties were barely affected. Based on the changes, femtosecond laser damage mechanism of chalcogenide glass doped with rare earth element was firstly proposed.<br/> © 2020

Number of references:51

Main heading:Femtosecond lasers

Controlled terms:Antimony compounds - Gallium compounds - Rare earths - Rare earth elements - Laser damage - Chalcogenides - Glass - Thulium compounds

Uncontrolled terms:Chalcogenide glass - Elemental distribution - Femtoseconds - Glass matrices - Laser induced damage thresholds - Luminescence properties - Microstructural changes - Rare-earth element doping

Classification code:547.2 Rare Earth Metals - 744.1 Lasers, General - 744.8 Laser Beam Interactions - 804.2 Inorganic Compounds - 812.3 Glass

DOI:10.1016/j.ceramint.2020.10.219

Funding details: Number: 2019JQ-236,2019JM-113, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;Number: JCTD-2018-19, Acronym: -, Sponsor: -;Number: IOSKL2020KF11, Acronym: SKLIOE, Sponsor: State Key Laboratory on Integrated Optoelectronics;Number: 61935006,62005312, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:This study was financially supported by the National Natural Science Foundation of China (No. 61935006 , 62005312 ), CAS Interdisciplinary Innovation Team Project ( JCTD-2018-19 ), and the Natural Science Basic Research Project in Shaanxi Province ( 2019JM-113 , 2019JQ-236 ), Open Fund of the State Key Laboratory of Integrated Optoelectronics ( IOSKL2020KF11 ). The authors thank Mr. Junjiang Guo for assistance with the experiments.

Database:Compendex

Accession number:20212010355746

Title:Application and Research of NaYF<inf>4</inf>:Yb<sup>3+</sup>/Eu<sup>3+</sup> Upconverting Luminescent Micro-Nano Particles in Anti-Counterfeiting Identification

Title of translation:NaYF<inf>4</inf>:Yb<sup>3+</sup>/Eu<sup>3+</sup>上转换发光微纳粒子在防伪识别中的应用研究

Authors:Wang, Chong (1); Mo, Jian-Ye (1, 2); Li, Dong-Dong (1); She, Jiang-Bo (2); Liu, Zhen (2)

Source title:Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis

Abbreviated source title:Guang Pu Xue Yu Guang Pu Fen Xi

Volume:41

Issue:5

Issue date:May 2021

Publication year:2021

Pages:1525-1529

Language:Chinese

ISSN:10000593

CODEN:GYGFED

Document type:Journal article (JA)

Publisher:Science Press

Abstract:<div data-language="eng" data-ev-field="abstract">Rare earth doped upconversion luminescent micro-nano particles have great application prospects in anti-counterfeit identification. First of all, in the article NaYF<inf>4</inf>:Yb<sup>3+</sup>/Eu<sup>3+</sup> micro-nano particles prepared by hydrothermal synthesis method, The size, morphology and crystallinity of NaYF<inf>4</inf>:Yb<sup>3+</sup>/Eu<sup>3+</sup> micro-nano particles were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope, and the luminescence properties of NaYF<inf>4</inf>:Yb<sup>3+</sup>/Eu<sup>3+</sup> micro-nano particles were analyzed using a 980 nm pump source; Secondly, NaYF<inf>4</inf>:Yb<sup>3+</sup>/Eu<sup>3+</sup> micro-nano particles and alcohol were mixed in a certain proportion to make a screen printing agent and combined with a network-customized screen template, different anti-counterfeit patterns were printed on the paper. After air drying, the words were exposed to a 980 nm laser and camera were used to study it. Finally, the printed words were divided into two parts, one was stored indoors at a constant temperature of 25℃, and the other was stored in the outdoor natural environment in January in winter. The storage locations are all Xi'an. After one week, in different environments the words were again tested with the same experimental instruments for imaging. The experiment and test results show that the diffraction peak of NaYF<inf>4</inf>:Yb<sup>3+</sup>/Eu<sup>3+</sup> micro-nano particles is a completely consistent standard card of NaYF<inf>4</inf>, and no other impurities are generated. In this experiment, The synthesized micro-nano particles are all hexagonal in shape, and the average length and cross-sectional width are 209 and 175 nm respectively. The surface of the nanocrystal is smooth, defect-free, unbent, with high crystallinity and good dispersion. The electron diffraction ring corresponds to the 312, 300, and 302 crystal planes of NaYF<inf>4</inf>:Yb<sup>3+</sup>/Eu<sup>3+</sup> micro-nano particles. NaYF<inf>4</inf>:Yb<sup>3+</sup>/Eu<sup>3+</sup> micro-nano particles are affected by doped ions, it produces four visible lights of blue, green, yellow and red by different energy level transitions. Through fluorescence spectrum analysis of NaYF<inf>4</inf>:Yb<sup>3+</sup>/Eu<sup>3+</sup> micro-nano particles. The asymmetry ratio of Eu<sup>3+</sup> ion is about 1. This result shows that the magnetic dipole transition is equivalent to the electric dipole transition. Screen printing agent of NaYF<inf>4</inf>:Yb<sup>3+</sup>/Eu<sup>3+</sup> micro-nano particles are good in different environments, the results are clear and easy to identify. However, affected by the storage environment, The results of indoor imaging have not changed much from the original imaging results. All characters of outdoor imaging are affected by moisture in the natural environment, the brightness is slightly reduced, but they can still be recognized. The imaging results show that the prepared NaYF<inf>4</inf>:Yb<sup>3+</sup>/Eu<sup>3+</sup> micro-nano particles have the characteristics of stability and reliability in anti-counterfeiting identification, but they are still affected by natural environmental factors with a controllable degree. On the whole, it has great application prospects in anti-counterfeiting identification.<br/></div> © 2021, Peking University Press. All right reserved.

Number of references:16

Main heading:Hydrothermal synthesis

Controlled terms:Crime - Luminescence - Morphology - Scanning electron microscopy - Rare earths - Light - Screen printing - Crystallinity - Crystal impurities - Nanoparticles - Transmission electron microscopy

Uncontrolled terms:Cross sectional width - Electric dipole transition - Energy level transitions - Fluorescence spectrum analysis - Luminescence properties - Magnetic dipole transition - Natural environmental factors - Stability and reliabilities

Classification code:741.1 Light/Optics - 745.1 Printing - 761 Nanotechnology - 802.2 Chemical Reactions - 804.2 Inorganic Compounds - 931.2 Physical Properties of Gases, Liquids and Solids - 933 Solid State Physics - 933.1 Crystalline Solids - 933.1.1 Crystal Lattice - 951 Materials Science - 971 Social Sciences

Numerical data indexing:Size 1.75e-07m, Size 2.09e-07m, Size 9.80e-07m

DOI:10.3964/j.issn.1000-0593(2021)05-1525-05

Database:Compendex

Accession number:20213610874252

Title:Terahertz photoconductive antenna based on antireflection dielectric metasurfaces with embedded plasmonic nanodisks

Authors:Jiang, Xiao-Qiang (1, 2); Fan, Wen-Hui (1, 2, 3); Song, Chao (1); Chen, Xu (1); Wu, Qi (1, 2)

Corresponding author:Fan, Wen-Hui(fanwh@opt.ac.cn)

Source title:Applied Optics

Abbreviated source title:Appl. Opt.

Volume:60

Issue:26

Issue date:September 10, 2021

Publication year:2021

Pages:7921-7928

Language:English

ISSN:1559128X

E-ISSN:21553165

CODEN:APOPAI

Document type:Journal article (JA)

Publisher:Optica Publishing Group (formerly OSA)

Abstract:<div data-language="eng" data-ev-field="abstract">By taking advantage of dielectric metasurfaces and plasmonic nanostructures, a terahertz photoconductive antenna (THz-PCA) is proposed and investigated in detail. The designed dielectric metasurfaces can reduce the optical reflection down to 1.4% and accelerate the switching process (electric conductive to resistive) that broadens the THz spectrum emitted from THz-PCA. Simultaneously, the embedded plasmonic nanostructures can realize 11.2 times enhancement in local electric field without affecting the switching process and the damage threshold of the THz-PCA. Simulated results indicate that the proposed THz-PCA is 70.56 times stronger in THz radiation power than that of the traditional THz-PCA. The significant enhancement ensures the proposed THz-PCA has great prospects in promoting THz technology based on the THz-PCA.<br/></div> © 2021 Optical Society of America

Number of references:41

Main heading:Nanostructures

Controlled terms:Antennas - Photoconductivity - Plasmonics - Terahertz waves - Electric fields

Uncontrolled terms:Anti-reflection - Damage threshold - Local electric field - Optical reflection - Photoconductive antennas - Plasmonic nanostructures - Simulated results - Switching process

Classification code:701.1 Electricity: Basic Concepts and Phenomena - 711 Electromagnetic Waves - 741.1 Light/Optics - 761 Nanotechnology - 932.3 Plasma Physics - 933 Solid State Physics

Numerical data indexing:Percentage 1.40e+00%

DOI:10.1364/AO.431678

Funding details: Number: 61675230,61905276, Acronym: NNSFC, Sponsor: National Natural Science Foundation of China;Number: 2020JQ-437, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;

Funding text:Funding. National Natural Science Foundation of China (61675230, 61905276); Natural Science Foundation of Shaanxi Province (2020JQ-437).

Database:Compendex

Accession number:20214111016451

Title:Ultrahigh-Q terahertz sensor based on simple all-dielectric metasurface with toroidal dipole resonance

Authors:Jiang, Xiao-Qiang (1, 2); Fan, Wen-Hui (1, 2, 3); Chen, Xu (1); Yan, Hui (1, 2)

Corresponding author:Fan, Wen-Hui(fanwh@opt.ac.cn)

Source title:Applied Physics Express

Abbreviated source title:Appl. Phys. Express

Volume:14

Issue:10

Issue date:October 2021

Publication year:2021

Article number:102008

Language:English

ISSN:18820778

E-ISSN:18820786

Document type:Journal article (JA)

Publisher:IOP Publishing Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">A simple all-dielectric metasurface with symmetric structure, exhibiting strong toroidal dipole (TD) resonance and ultrahigh quality factor (Q-factor), is proposed. The physical mechanisms of the TD resonance are investigated by calculating the electromagnetic field and the scattering power of multipoles. Simulated results demonstrate that the Q-factor is up to 3.71 × 104 and the corresponding figure of merit is 636.7. Moreover, the TD resonance can be excited under both x- and y-polarized incident terahertz waves due to the symmetric structure. The remarkable performances make the proposed metasurface has feasible capability for biological and chemical sensing in terahertz range.<br/></div> © 2021 The Japan Society of Applied Physics.

Number of references:31

Main heading:Terahertz waves

Controlled terms:Chemical sensors - Q factor measurement - Electromagnetic fields - Resonance

Uncontrolled terms:Dipole resonances - Metasurface - Multipoles - Physical mechanism - Power - Quality factors - Simple++ - Simulated results - Symmetric structures - Terahertz sensors

Classification code:701 Electricity and Magnetism - 711 Electromagnetic Waves - 801 Chemistry - 931.1 Mechanics - 942.2 Electric Variables Measurements

DOI:10.35848/1882-0786/ac27b7

Database:Compendex

Accession number:20212210422607

Title:Magneto-optically reorientation-induced image reconstruction in bulk nematic liquid crystals (Open Access)

Authors:ZHANG, YONGBIN (1, 2); WANG, ZHAOLU (1); HUANG, NAN (1); LIU, HONGJUN (1, 3)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China; (3) University of Chinese Academy of Sciences, Beijing; 100084, China

Corresponding author:LIU, HONGJUN(liuhongjun@opt.ac.cn)

Source title:Optics Express

Abbreviated source title:Opt. Express

Volume:29

Issue:11

Issue date:May 24, 2021

Publication year:2021

Pages:17581-17590

Language:English

E-ISSN:10944087

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">We theoretically propose the magneto-optically reorientation-induced image reconstruction in bulk nematic liquid crystals (NLCs). The underlying signals are reinforced and recovered at the expense of scattering noise under reorientation-induced self-focusing nonlinearity. The intensity perturbation gain is derived and the numerical results are presented to show the response of NLC molecules to the diffusive images. The nonlinear image recovery is influenced by the input light intensity, the magnetic field direction, and the correlation length. The results suggest an alternative approach to detect noisy images and promote the application of NLCs in image processing.<br/></div> © 2021 Optical Society of America.

Number of references:34

Main heading:Nematic liquid crystals

Controlled terms:Image reconstruction - Magnetos

Uncontrolled terms:Bulk nematic - Correlation lengths - Image recovery - Input light - Magnetic field direction - Numerical results - Scattering noise - Self-focusing

Classification code:705.2 Electric Generators - 708.4 Magnetic Materials

DOI:10.1364/OE.425642

Funding details: Number: 61775234,61975232, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:National Natural Science Foundation of China (61775234, 61975232).

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20212410479921

Title:Enhanced optical absorption surface of titanium fabricated by a femtosecond laser assisted with airflow pressure (Open Access)

Authors:Li, Xun (1, 3); Li, Ming (1); Liu, Hongjun (1, 2)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi'an; 710119, China; (2) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding authors:Li, Ming(liming@opt.ac.cn); Liu, Hongjun(liuhongjun@opt.ac.cn)

Source title:Chinese Optics Letters

Abbreviated source title:Chin. Opt. Lett.

Volume:19

Issue:9

Issue date:September 2021

Publication year:2021

Article number:091404

Language:English

ISSN:16717694

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">We propose an effective way to achieve an enhanced optical absorption surface of titanium alloy 7 (Ti7) fabricated by a femtosecond (fs) laser assisted with airflow pressure. The effect of laser scanning speed and laser power on the surfaces' morphology and average reflectivity was studied. In order to further reduce the surface's reflectivity, different airflow pressure was introduced during the fabrication of Ti7 by a fs laser. Furthermore, the average reflectivity of samples fabricated under different laser parameters assisted with airflow was presented. In addition, the high and low temperature tests of all samples were performed to test the stability performance of the hybrid micro/nanostructures in extreme environments. It is demonstrated that the airflow pressure has an important influence on the micro/nanostructures for light trapping, the average reflectivity of which could be as low as 2.31% over a broad band of 250-2300 nm before high and low temperature tests, and the reflection for specific wavelengths can go below 1.5%.<br/></div> © 2021 OSA - The Optical Society. All rights reserved.

Number of references:45

Main heading:Reflection

Controlled terms:Surface morphology - Fabrication - Morphology - Titanium alloys - Light absorption - Temperature - Femtosecond lasers

Uncontrolled terms:Broad bands - Extreme environment - Femtosecond (fs) laser - Laser parameters - Laser scanning speed - Light-trapping - Micro/nanostructures - Stability performance

Classification code:542.3 Titanium and Alloys - 641.1 Thermodynamics - 741.1 Light/Optics - 744.1 Lasers, General - 931.2 Physical Properties of Gases, Liquids and Solids - 951 Materials Science

Numerical data indexing:Percentage 1.50e+00%, Percentage 2.31e+00%, Size 2.50e-07m to 2.30e-06m

DOI:10.3788/COL202119.091404

Funding details: Number: 2018YFB1107704, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;Number: S2019-YF-ZDCXL-ZDLGY-0253,S2020-YF-ZDCXL-ZDLGY-0021, Acronym: -, Sponsor: Shanxi Provincial Key Research and Development Project;Number: S2019-ZDZX-ZNZC-3.1-0001, Acronym: -, Sponsor: Key Science and Technology Program of Shaanxi Province;

Funding text:This work was supported by the National Key R&D Program of China (No. 2018YFB1107704), the Key Research and Development Program of Shaanxi Province (Nos. S2019-YF-ZDCXL-ZDLGY-0253 and S2020-YF-ZDCXL-ZDLGY-0021), and the Major Science and Technology Projects in Shaanxi Province (No. S2019-ZDZX-ZNZC-3.1-0001).

Database:Compendex

Open Access type(s): All Open Access, Bronze

Accession number:20212310450853

Title:Accuracy-enhanced coherent Ising machine using the quantum adiabatic theorem (Open Access)

Authors:Li, Lin (1, 2); Liu, Hongjun (1, 3); Huang, Nan (1); Wang, Zhaolu (1)

Corresponding author:Liu, Hongjun(liuhongjun@opt.ac.cn)

Source title:Optics Express

Abbreviated source title:Opt. Express

Volume:29

Issue:12

Issue date:June 7, 2021

Publication year:2021

Pages:18530-18539

Language:English

E-ISSN:10944087

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">The coherent Ising machine (CIM) implemented by degenerate optical parametric oscillator (DOPO) networks is a novel optical platform to accelerate computation of hard combinatorial optimization problems. Nevertheless, with the increase of the problem size, the probability of the machine being trapped by local minima increases exponentially. According to the quantum adiabatic theorem, a physical system will remain in its instantaneous ground state if the time-dependent Hamiltonian varies slowly enough. Here, we propose a method to help the machine partially avoid getting stuck in local minima by introducing quantum adiabatic evolution to the ground-state-search process of the CIM, which we call A-CIM. Numerical simulation results demonstrate that A-CIM can obtain improved solution accuracy in solving MAXCUT problems of vertices ranging from 10 to 2000 than CIM. The proposed machine that is based on quantum adiabatic theorem is expected to solve optimization problems more correctly.<br/></div> © 2021 Optical Society of America.

Number of references:49

Main heading:Ground state

Controlled terms:Optical parametric oscillators - Quantum theory - Computation theory - Hamiltonians - Combinatorial optimization

Uncontrolled terms:Adiabatic evolution - Combinatorial optimization problems - Degenerate optical parametric oscillators - Optical platforms - Optimization problems - Quantum adiabatic theorem - Solution accuracy - Time-dependent Hamiltonians

Classification code:721.1 Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory - 921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory - 921.5 Optimization Techniques - 931.4 Quantum Theory; Quantum Mechanics

DOI:10.1364/OE.426476

Funding details: Number: 61775234,61975232, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:National Natural Science Foundation of China (61775234, 61975232).

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20213110707030

Title:A Comprehensive Review on Parallel Phase-shifting Digital Holography(Invited)

Title of translation:同步相移数字全息综述(特邀)

Authors:Zhang, Meiling (1); Gao, Peng (1); Wen, Kai (1); Zhuo, Kequn (1); Wang, Yang (1); Liu, Lixin (1); Min, Junwei (2); Yao, Baoli (2)

Author affiliation:(1) School of Physics and Optoelectronic Engineering, Xidian University, Xi'an; 710071, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China

Corresponding author:Yao, Baoli(yaobl@opt.ac.c.cn)

Source title:Guangzi Xuebao/Acta Photonica Sinica

Abbreviated source title:Guangzi Xuebao

Volume:50

Issue:7

Issue date:July 25, 2021

Publication year:2021

Article number:0709001

Language:Chinese

ISSN:10044213

CODEN:GUXUED

Document type:Journal article (JA)

Publisher:Chinese Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">Phase-shifting Digital Holography(PSDH), which combines phase-shifting technology with digital holography, provides a fast, non-invasive, and high-precision approach for the three-dimensional morphology or refractive index distribution of microscopic objects. Compared with the off-axis digital holography, the phase-shifting on-axis digital holography makes full utilization of Spatial-bandwidth Product (SBP) of the CCD camera. The conventional phase-shifting digital holography needs to records multiple phase-shifting holograms in a step-by-step manner, from which the artifact-free phase and amplitude images of a sample can be reconstructed. To enhance the imaging speed of PSDH, parallel phase-shifting technique (or simultaneous phase-shifting technique) was proposed, with which multiple phase-shifting holograms can be obtained at the same time. In this paper, the concept and implementation of phase-shifting technologies are introduced firstly. Then, three different approaches of parallel phase-shifting, which are based on multiple CCDs, pixelated phase-mask, and parallel beam-splitting, are reviewed. Eventually, the applications of parallel PSDH in the biomedical field, air/liquid flow visualization, surface topography, micro-/nano-scale device inspection are introduced.<br/></div> © 2021, Science Press. All right reserved.

Number of references:122

Main heading:Holograms

Controlled terms:Lithography - Topography - Refractive index - CCD cameras

Uncontrolled terms:Digital holography - Microscopic objects - Off-axis digital holographies - Phase-shifting digital holography - Phase-shifting technique - Phase-shifting technology - Refractive-index distribution - Three dimensional morphology

Classification code:714.2 Semiconductor Devices and Integrated Circuits - 741.1 Light/Optics - 742.2 Photographic Equipment - 743 Holography - 951 Materials Science

DOI:10.3788/gzxb20215007.0709001

Funding details: Number: 61975233,62075177, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2020JQ-324, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;Number: -, Acronym: SKLTOP, Sponsor: State Key Laboratory of Transient Optics and Photonics;Number: -, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;

Funding text:Foundation item：National Natural Science Foundation of China（Nos. 62075177，61975233），Natural Science Foundation of Shaanxi Province（Nos.2020JM-193，2020JQ-324），Fundamental Research Funds for the Central Universities（No.JB210513），State Key Laboratory of Transient Optics and Photonics（No.SKLST201804），State Key Laboratory of Jiangxi Province for Image Processing and Pattern Recognition（No.ET202080417）

Database:Compendex

Accession number:20211610236249

Title:Research progress of 0.9 ~ 1.0 μm near-infrared continuous-wave fiber lasers

Title of translation:0.9~1.0 μm近红外连续光纤激光器的研究进展

Authors:Dang, Wen-Jia (1); Li, Zhe (2, 3); Lu, Na (1); Li, Yu-Ting (1); Zhang, Lei (1); Tian, Xiao (1)

Author affiliation:(1) School of Science, Xi'an Aeronautical University, Xi'an; 710077, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Dang, Wen-Jia(wenjia_dang@126.com)

Source title:Chinese Optics

Abbreviated source title:Chin. Opt.

Volume:14

Issue:2

Issue date:March 2021

Publication year:2021

Pages:264-274

Language:Chinese

ISSN:20971842

Document type:Journal article (JA)

Publisher:Editorial Office of Chinese Optics

Abstract:<div data-language="eng" data-ev-field="abstract">Near-infrared continuous-wave fiber lasers with wavelengths of 0.9~1.0 μm have important application prospects in the fields of high-power blue and ultraviolet laser generation, high-power single-mode pump sources, biomedicine and lidars. They have thus become a heavily researched topic in recent years. At present, their gain mechanisms mainly include a rare earth ion gain or a nonlinear effect gain. In this paper, the research progress of 0.9~1.0 μm fiber lasers based on these two kinds of gain mechanisms are reviewed in detail, and the technical bottlenecks and solutions of these lasers are analyzed. Furthermore, the potential directions for the future of their research are proposed.<br/></div> Copyright ©2021 Chinese Optics. All rights reserved.

Number of references:64

Main heading:Fiber lasers

Controlled terms:Continuous wave lasers - Infrared devices - Infrared lasers - Metal ions - Pumping (laser) - Rare earths - Ultraviolet lasers

Uncontrolled terms:Continuous Wave - High power - Near Infrared - Near-infrared - Near-infrared laser with a wavelength of 0.9~1.0 μm - Near-infrared lasers - Nonlinear effect - Nonlinear effect gain - Rare earth ion gain - Rare earth ions

Classification code:531.1 Metallurgy - 744.1 Lasers, General - 744.4 Solid State Lasers - 804.2 Inorganic Compounds

Numerical data indexing:Size 9.00E-07m to 1.00E-06m

DOI:10.37188/CO.2020-0193

Funding details: Number: 2019KRM093, Acronym: -, Sponsor: -;Number: 2018ZDXM-GY-051, Acronym: -, Sponsor: -;Number: 17JK0394,19JK0429, Acronym: -, Sponsor: Education Department of Shaanxi Province;Number: 2019JQ-914, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;

Funding text:基金项目：陕 西 省 自 然 科 学 基 础 研 究 计 划 资 助 项 目 （ No. 2019JQ-914） ； 陕 西 省 创 新 能 力 支 撑 计 划 项 目 （No. 2019KRM093）；陕西省教育厅专项科研计划项目（No. 17JK0394，No. 19JK0429）；陕西省科技厅重点研发 计划项目（No. 2018ZDXM-GY-051） Supported by the Natural Science Basic Research Program of Shaanxi (No. 2019JQ-914); Innovation Capabil-ity Support Program of Shaanxi (No. 2019KRM093); Scientific Research Program Funded by Shaanxi Provin-cial Education Department (No. 17JK0394, No. 19JK0429); Key Research and Development Program Fund of Shaanxi Science and Technology Department (No. 2018ZDXM-GY-051)Supported by the Natural Science Basic Research Program of Shaanxi (No. 2019JQ-914); Innovation Capability Support Program of Shaanxi (No. 2019KRM093); Scientific Research Program Funded by Shaanxi Provincial Education Department (No. 17JK0394, No. 19JK0429); Key Research and Development Program Fund of Shaanxi Science and Technology Department (No. 2018ZDXM-GY-051)

Database:Compendex

Accession number:20220111429924

Title:Dual-wavelength in-line digital holography with untrained deep neural networks

Authors:Bai, Chen (1); Peng, Tong (1, 2); Min, Junwei (1); Li, Runze (1); Zhou, Yuan (1); Yao, Baoli (1, 3)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) Xi'an Jiaotong University, Xi'an; 710049, China; (3) Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao; 266200, China

Corresponding author:Yao, Baoli(yaobl@opt.ac.cn)

Source title:Photonics Research

Abbreviated source title:Photon. Res.

Volume:9

Issue:12

Issue date:December 1, 2021

Publication year:2021

Pages:2501-2510

Language:English

ISSN:23279125

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">Dual-wavelength in-line digital holography (DIDH) is one of the popular methods for quantitative phase imaging of objects with non-contact and high-accuracy features. Two technical challenges in the reconstruction of these objects include suppressing the amplified noise and the twin-image that respectively originate from the phase difference and the phase-conjugated wavefronts. In contrast to the conventional methods, the deep learning network has become a powerful tool for estimating phase information in DIDH with the assistance of noise suppressing or twin-image removing ability. However, most of the current deep learning-based methods rely on supervised learning and training instances, thereby resulting in weakness when it comes to applying this training to practical imaging settings. In this paper, a new DIDH network (DIDH-Net) is proposed, which encapsulates the prior image information and the physical imaging process in an untrained deep neural network. The DIDHNet can effectively suppress the amplified noise and the twin-image of the DIDH simultaneously by automatically adjusting the weights of the network. The obtained results demonstrate that the proposed method with robust phase reconstruction is well suited to improve the imaging performance of DIDH.<br/></div> © 2021 Chinese Laser Press.

Number of references:40

Main heading:Deep neural networks

Controlled terms:Holography - Learning systems

Uncontrolled terms:Conventional methods - Dual-wavelength - High-accuracy - In-line digital holography - Learning network - Non-contact - Phase difference - Quantitative phase imaging - Technical challenges - Twin-image

Classification code:461.4 Ergonomics and Human Factors Engineering - 743 Holography - 746 Imaging Techniques

DOI:10.1364/PRJ.441054

Funding details: Number: 61905277,61975233, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2021401, Acronym: YIPA CAS, Sponsor: Youth Innovation Promotion Association of the Chinese Academy of Sciences;Number: 2020GY-008, Acronym: -, Sponsor: Key Research and Development Projects of Shaanxi Province;

Funding text:Funding. National Natural Science Foundation of China (61905277, 61975233); Key Research and Development Projects of Shaanxi Province (2020GY-008); Youth Innovation Promotion Association of the Chinese Academy of Sciences (2021401).

Database:Compendex

Accession number:20214411106031

Title:Research progress of tunable fiber light sources with wavelength near 1 μm

Title of translation:近1 μm波段可调谐光纤光源的研究进展

Authors:Dang, Wen-Jia (1); Gao, Qi (2, 3); Li, Zhe (2, 3); Li, Gang (2, 3)

Corresponding authors:Li, Zhe(lizhe@opt.ac.cn); Li, Zhe(lizhe@opt.ac.cn); Li, Gang(ligang85@opt.ac.cn); Li, Gang(ligang85@opt.ac.cn)

Source title:Chinese Optics

Abbreviated source title:Chin. Opt.

Volume:14

Issue:5

Issue date:September 2021

Publication year:2021

Pages:1120-1132

Language:Chinese

ISSN:20971842

Document type:Journal article (JA)

Publisher:Editorial Office of Chinese Optics

Abstract:<div data-language="eng" data-ev-field="abstract">Tunable fiber light sources with wavelength near 1 μm are widely used in optical fiber sensing, laser cooling, photochemical, spectroscopy and medical fields. They have thus become an area of focus in fiber light source research in recent years. The development history of fiber light sources with wavelength tuning ability is firstly summarized systematically. Then, their problems and possible solutions are analyzed. Finally, the future developments of tunable fiber light sources near 1 μm are prospected.<br/></div> © 2021, China Science Publishing & Media LTD. All right reserved.

Number of references:57

Main heading:Fiber lasers

Controlled terms:Laser cooling - Optical fibers

Uncontrolled terms:Cooling fields - Fiber light source - Optical fiber sensing - Raman fiber lasers - Random fiber laser - Random fibers - Sensing lasers - Superfluorescent fiber sources - Tunable wavelength - Tunables

Classification code:741.1.2 Fiber Optics - 744.4 Solid State Lasers - 744.9 Laser Applications - 931.3 Atomic and Molecular Physics

Numerical data indexing:Size 1.00E-06m

DOI:10.37188/CO.2021-0125

Funding details: Number: 2017YFB1104400, Acronym: -, Sponsor: -;

Funding text:收稿日期：2021-06-10；修订日期：2021-07-13 基金项目：国家重点研发计划项目（No. 2017YFB1104400） Supported by National Key R& D Program of China (No. 2017YFB1104400).

Database:Compendex

Accession number:20211910310695

Title:Molybdenum Carbide Buried in D-Shaped Fibers as a Novel Saturable Absorber Device for Ultrafast Photonics Applications

Authors:Liu, Sicong (1); Shang, Shiguang (2); Lv, Ruidong (3); Wang, Yonggang (1, 4); Wang, Jiang (1); Ren, Wei (2); Wang, Yishan (4)

Author affiliation:(1) School of Physics and Information Technology, Shaanxi Normal University, Xi'an; 710119, China; (2) School of Science, Xi'An Institute of Posts and Telecommunications, Xi'an; 710121, China; (3) School of Electronic Science and Engineering, Xi'An Jiaotong University, Xi'an; 710049, China; (4) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China

Corresponding author:Wang, Yonggang(chinawygxjw@snnu.edu.cn)

Source title:ACS Applied Materials and Interfaces

Abbreviated source title:ACS Appl. Mater. Interfaces

Volume:13

Issue:16

Issue date:April 28, 2021

Publication year:2021

Pages:19128-19137

Language:English

ISSN:19448244

E-ISSN:19448252

Document type:Journal article (JA)

Publisher:American Chemical Society

Abstract:<div data-language="eng" data-ev-field="abstract">Study of nonlinear laser-matter interactions in 2D materials has promoted development of photonics applications. As a typical MXene material, molybdenum carbide (Mo2C) has attracted much attention because of its graphene-like structure. Here, a type of D-shaped fiber (DF)-buried Mo2C saturable absorber (SA) fabricated by magnetron-sputtering deposition (MSD) and sol-gel technique is reported. The Mo2C material was buried between the bottom DF and the upper amorphous silica fabricated by sol-gel technology. Therefore, the DF-based SA effectively solves the problem of material shedding and aging, thus improving the stability and damage threshold of the fiber laser. Application of the SA in erbium-doped fiber laser and stable passive Q-switched operation with a maximum pulse energy of 430.47 nJ is realized. By adjusting the polarization state and pump power, high-power mode-locked pulses are generated with a pulse duration and output power of 199 fs and 54.13 mW, respectively. Further, bound-state soliton pulses are obtained with a pulse width of 312 fs and soliton interval of 1.26 ps for the first time based on MXene materials. Moreover, by application of the SA in ytterbium-doped fiber lasers, a stable dissipative soliton mode-locked pulse is obtained with a pulse width of 23 ps. These results indicate that the DF-based buried Mo2C as a novel SA provides a reliable method for all-fiber and multifunctional high-power ultrafast laser.<br/></div> © 2021 American Chemical Society.

Number of references:45

Main heading:Fiber lasers

Controlled terms:Saturable absorbers - Silica - Sol-gel process - Molybdenum compounds - Optical pumping - Sol-gels - Ultrafast lasers - Fibers - Carbides

Uncontrolled terms:Dissipative solitons - Erbium doped fiber laser - Magnetron-sputtering deposition - Photonics applications - Polarization state - Sol-gel technology - Ultra-fast photonics - Ytterbium-doped fiber lasers

Classification code:744.1 Lasers, General - 744.4 Solid State Lasers - 804 Chemical Products Generally - 804.2 Inorganic Compounds - 812.1 Ceramics - 812.3 Glass

Numerical data indexing:Energy 4.30e-07J, Power 5.41e-02W, Time 1.26e-12s, Time 1.99e-13s, Time 2.30e-11s, Time 3.12e-13s

DOI:10.1021/acsami.1c01345

Funding details: Number: GK201702005, Acronym: -, Sponsor: -;Number: 61690222, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2019TS117, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;

Funding text:This work is supported by the Central University Special Fund Basic Research and Operating Expense (GK201702005), Fundamental Research Funds for the Central Universities (2019TS117), and National Natural Science Foundation of China (61690222).

Database:Compendex

Accession number:20210509874615

Title:GaAs material photorefractive response time measurement based on spectral probe

Authors:Yang, Qing (1); Yin, Fei (1, 2); Wang, Tao (2); Gao, Guilong (2); He, Kai (2); Yan, Xin (2)

Author affiliation:(1) School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi; 710049, China; (2) Key Laboratory of Ultrafast Photoelectric Diagnostics Technology, Xian Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences (CAS), Xian, Shaanxi; 710119, China

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11761

Part number:1 of 1

Issue title:Fourth International Conference on Photonics and Optical Engineering

Issue date:2021

Publication year:2021

Article number:117610U

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510643574

Document type:Conference article (CA)

Conference name:4th International Conference on Photonics and Optical Engineering

Conference date:October 15, 2020 - October 16, 2020

Conference location:Xi'an, China

Conference code:166676

Publisher:SPIE

Abstract:The ultrafast all-optical solid-state framing camera(UASFC) technique is a new diagnostic method based on the semiconductor photorefractive effect. The ultra-fast response characteristics of this method are mainly determined by the response time of the semiconductor material's photorefractive index change. How to quickly and accurately measure the photorefractive index response time of semiconductor materials is an important step in the development of all-optical solid ultra-fast diagnostic chip. In this paper, the 100fs pulsed laser is divided into two beams. One of which is used as excitation light to generate pulsed X-ray source; the other beam is measured as a spectral probe light. Through the test of GaAs material, the response time of the refractive index change of GaAs material was less than 5ps, which laid a foundation for further optimization experiment and accurate measurement.<br/> © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

Number of references:13

Main heading:Gallium arsenide

Controlled terms:III-V semiconductors - Semiconductor lasers - Photoreactivity - Refractive index - Semiconducting gallium - Probes

Uncontrolled terms:Accurate measurement - Diagnostic methods - Excitation light - Photorefractive effects - Photorefractive index - Photorefractive response - Pulsed x-ray sources - Refractive index changes

Classification code:712.1 Semiconducting Materials - 712.1.1 Single Element Semiconducting Materials - 741.1 Light/Optics - 744.4.1 Semiconductor Lasers - 804 Chemical Products Generally

Numerical data indexing:Time 1.00e-13s, Time 5.00e-12s

DOI:10.1117/12.2586950

Database:Compendex

Accession number:20212510525586

Title:Advances in G-stack diode laser using macro-channel water cooling and high thermal conductivity material packaging

Authors:Han, Yang (1); Sun, Lichen (1); Fu, Tuanwei (1); Gao, Lijun (1); Zheng, Yanfang (1); Chen, Yunzhu (1); Zhang, Xiaojuan (1); Yan, Minna (1); Zhao, Sicheng (1); Yang, Kai (1); Gao, Lei (1); Zah, Chungen (1); Liu, Xingsheng (1, 2)

Author affiliation:(1) Focuslight Technologies Inc., 56 Zhangba 6th Road, Xi'an High-Tech Zone, Xi'an, Shaanxi; 710077, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an Hi-Tech Industrial Development Zone, No. 17 Xinxi Road, New Industrial Park, Xi'an, Shaanxi; 710119, China

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11668

Part number:1 of 1

Issue title:High-Power Diode Laser Technology XIX

Issue date:2021

Publication year:2021

Article number:116680W

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510641716

Document type:Conference article (CA)

Conference name:High-Power Diode Laser Technology XIX 2021

Conference date:March 6, 2021 - March 11, 2021

Conference location:Virtual, Online, United states

Conference code:169165

Sponsor:The Society of Photo-Optical Instrumentation Engineers (SPIE)

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">There are strong demands at the market to increase power and reliability for high power diode laser. In parallel to this the requirements for cooler and package for the high power diode laser increase. Superior heat dissipation capability and low thermal resistance are some of the key attributes for the diode laser package design in the near future. The most common method of removing the large amounts of waste heat in a diode laser is using a micro-channel cooler. However, a microchannel cooler requires water to meet demanding specifications to avoid failures due to corrosion, which increases the overall cost to operate and maintain the laser. We demonstrate advances in a new macro-channel water cooling diode laser which are designed to eliminate the failure mechanisms associated with micro-channel coolers, and enhance the laser heat dissipation and the long-term reliability. For the package adopting the high thermal conductivity material, the maximum output power is 100 W per bar in CW mode. Due to the advantage of compact design, high power, high reliability and fast axis collimation, the new diode laser has the potential to be widely used in many fields, such as pumping solid state laser, hair removal, industry and research. © 2021 SPIE.<br/></div> © 2021 SPIE. All rights reserved.

Number of references:8

Main heading:Semiconductor lasers

Controlled terms:Cooling water - Corrosion - Thermoelectric equipment - Waste heat - Failure (mechanical) - Heat resistance - Pumping (laser) - Reliability - Cooling systems - Solid state lasers - Laser beam welding - Power semiconductor diodes

Uncontrolled terms:Failure mechanism - Fast axis collimations - Heat dissipation capability - High power diode laser - High thermal conductivity - Material packaging - Maximum output power - Microchannel coolers

Classification code:525.4 Energy Losses (industrial and residential) - 538.2.1 Welding Processes - 615.4 Thermoelectric Energy - 714.2 Semiconductor Devices and Integrated Circuits - 744.1 Lasers, General - 744.4 Solid State Lasers - 744.4.1 Semiconductor Lasers - 744.9 Laser Applications

Numerical data indexing:Power 1.00e+02W

DOI:10.1117/12.2582695

Database:Compendex

Accession number:20210609900370

Title:Research on the X-ray wavelength division multiplexing technology for blackout region communication (Open Access)

Authors:LI, YAO (1); SU, TONG (2); SHENG, LIZHI (2); XU, NENG (2); ZHAO, BAOSHENG (2)

Author affiliation:(1) Shaanxi Province Key Laboratory of Thin Films Technology and Optical Test, College of Optoelectronic Engineering, Xi'an Technological University, Xi'an; 710021, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences (CAS), Xi'an; 710119, China

Corresponding author:LI, YAO(liyao_xatu@163.com)

Source title:Optica Applicata

Abbreviated source title:Opt Appl

Volume:50

Issue:4

Issue date:2021

Publication year:2021

Pages:619-632

Language:English

ISSN:00785466

E-ISSN:18997015

CODEN:OPAPBZ

Document type:Journal article (JA)

Publisher:Wroc&lstrok;aw University of Science and Technology

Abstract:After the concept of X-ray communication was proposed, its application in complex electromagnetic environment has received more attention, such as data transmission in re-enter special electromagnetic condition. In this article, a new type of X-ray source was introduced firstly, which was expected to generate multiple characteristic lines and achieve wavelength division multiplexing technology in X-ray band. Then an experimental platform was built for analyzing transmission characteristics of X-ray photon in various plasma media. Finally, the calculation model for a link power equation was given. Experiment results show that transmittance of 8-18 keV X-ray signal is relatively stable, atomic numbers from 29 to 42 are the most suitable materials for wavelength division multiplexing, the X-ray communication system is expected to realize about 200 kbps data transmission rate in adjacent space.<br/> © 2020 WrocÅ&sbquo;aw University of Science and Technology. All rights reserved.

Number of references:28

Main heading:Atoms

Controlled terms:Data transfer - Plasma sheaths - Wavelength division multiplexing

Uncontrolled terms:Calculation models - Data transmission rates - Electromagnetic environments - Experimental platform - Multiple characteristics - Transmission characteristics - Wavelength division multiplexing technology - X-ray wavelengths

Classification code:931.3 Atomic and Molecular Physics - 932.3 Plasma Physics

Numerical data indexing:Bit_Rate 2.00e+05bit/s

DOI:10.37190/OA200409

Funding details: Number: 20JY031, Acronym: -, Sponsor: -;Number: 11805150,61901470,62001364, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 20JK0665, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Provincial Department of Education;Number: 2020JQ-818, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;

Funding text:Acknowledgements – This article was supported by NSFC of China (No. 61901470, No. 62001364 and No. 11805150) and the Basic Research Program of Shaanxi Province Natural Science Foundation (No. 2020JQ-818), the Natural Science Foundation of Shaanxi Provincial Department of Education (No. 20JK0665), and the Collaborative Innovation Center Project of Shaanxi Provincial Department of Education (20JY031). The quasi-static and dynamic-dusty experiments were carried out in the College of Aerospace Science and Technology, XIDIAN University and XIOPM, respectively.

Database:Compendex

Open Access type(s): All Open Access, Green

Accession number:20210809975867

Title:Research Progress of Attosecond Pulse Generation and Characterization (Invited)

Title of translation:阿秒脉冲产生和测量技术研究进展(特邀)

Authors:Wang, Hushan (1); Cao, Huabao (1); Pi, Liangwen (1); Huang, Pei (1); Wang, Xianglin (1); Xu, Peng (1); Yuan, Hao (1, 2); Liu, Xin (1, 2); Wang, Yishan (1); Zhao, Wei (1); Fu, Yuxi (1)

Corresponding author:Wang, Yishan(yshwang@opt.ac.cn)

Source title:Guangzi Xuebao/Acta Photonica Sinica

Abbreviated source title:Guangzi Xuebao

Volume:50

Issue:1

Issue date:January 25, 2021

Publication year:2021

Article number:0132001

Language:Chinese

ISSN:10044213

CODEN:GUXUED

Document type:Journal article (JA)

Publisher:Chinese Optical Society

Abstract:Attosecond pulse light source, born at the turn of 21st centruy, is a fully coherent light source with attosecond-temporal and nano-spatial resolution, leading to the remarkable progress and breakthroughs in attosecond science in the past two decades. New research methods and important innovation opportunities in physics, chemistry, biology, materials, information and other fields have emerged with the advent of attoseond pulse. This review surveys the important efforts aimed at developing attosecond pulses, mainly summarizes the key technologies and status of high-order harmonics, attosecond pulse generation and attosecond pulse measurement, and presents the development prospects of attosecond pulse research in the end.<br/> © 2021, Science Press. All right reserved.

Number of references:164

Main heading:Light sources

Controlled terms:Light

Uncontrolled terms:Attosecond pulse - Attosecond pulse generation - Attosecond science - Attoseconds - Development prospects - High order harmonics - Key technologies - Spatial resolution

Classification code:741.1 Light/Optics

DOI:10.3788/gzxb20215001.0132001

Funding details: Number: S19-020, Acronym: -, Sponsor: -;Number: 202005YK01, Acronym: -, Sponsor: -;Number: 61690222,92050107,XAB2019B25, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: J20-021, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2019JCW-03, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;

Funding text:Foundation item：Natural Science Basic Research Program of Shaanxi（No. 2019JCW-03），Major Science and Technology Infrastructure Pre-research Program of the CAS（No. J20-021-Ⅲ），National Natural Science Foundation of China（No. 92050107），National Natural Science Foundation of China（No. 61690222），CAS"Light of West China"Program（No. XAB2019B25），Science and Technology Program of Xi'an（No. 202005YK01），Key Deployment Research Program of XIOPM（No. S19-020-Ⅲ）

Database:Compendex

Accession number:20213010677900

Title:Waveguide Optimization and Efficiency Characteristic Analysis of 808 nm Laser Diodes

Title of translation:808 nm半导体激光芯片波导优化与效率特性分析

Authors:Chang, Yi-Dong (1, 2); Wang, Zhen-Fu (2); Zhang, Xiao-Ying (3); Yang, Guo-Wen (2); Li, Te (2); Du, Yu-Qi (1, 2); Zhao, Yu-Liang (1, 2); Liu, Yu-Xian (1, 2); Lan, Yu (1, 2)

Author affiliation:(1) University of Chinese Academy of Sciences, Beijing; 100049, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) Shaanxi Institute of Metrology Science, Xi'an; 710100, China

Corresponding author:Wang, Zhen-Fu(wzf2718@opt.ac.cn)

Source title:Faguang Xuebao/Chinese Journal of Luminescence

Abbreviated source title:Faguang Xuebao

Volume:42

Issue:7

Issue date:July 2021

Publication year:2021

Pages:1040-1048

Language:Chinese

ISSN:10007032

CODEN:FAXUEW

Document type:Journal article (JA)

Publisher:Editorial Office of Chinese Optics

Abstract:<div data-language="eng" data-ev-field="abstract">The waveguide thickness of 808 nm InAlGaAs/AlGaAs laser diode chip was optimized in this paper. The study found that when the thickness ratio of the N-waveguide to the P-waveguide was 1.8, the chip had the highest power conversion efficiency. Chip-on-submount(COS) packaged single emitters and fiber-coupled modules@core diameter 62.5 μm, numerical aperture(NA) 0.22 were presented based on this conclusion, and the efficiency characteristic of the devices in the range of -10-90℃ was analyzed. The results showed that when the temperature increased from -10 to 90℃, the carrier leakage ratio of COS single emitter increased from 1.18% to 16.67%, and the carrier leakage ratio of fiber-coupled module increased from 1.99% to 17.73%, indicating that the increase of carrier leakage caused by temperature rise was the main factor leading to the decrease of power conversion efficiency. Moreover, the effects of high-temperature aging, thermal vacuum conditions and space radiation on the power conversion efficiency of fiber-coupled module were studied and the internal factors that lead to the reduction of the device's power conversion efficiency were revealed.<br/></div> © 2021, Science Press. All right reserved.

Number of references:21

Main heading:Semiconductor lasers

Controlled terms:Radiation effects - Diodes - Fibers - Waveguides - Conversion efficiency

Uncontrolled terms:Efficiency characteristic - Fiber coupled modules - High temperature aging - Numerical aperture - Power conversion efficiencies - Thermal vacuum condition - Waveguide optimization - Waveguide thickness

Classification code:525.5 Energy Conversion Issues - 714.3 Waveguides - 744.4.1 Semiconductor Lasers

Numerical data indexing:Percentage 1.18e+00% to 1.67e+01%, Percentage 1.99e+00% to 1.77e+01%, Size 6.25e-05m, Size 8.08e-07m

DOI:10.37188/CJL.20210108

Funding details: Number: 2017KJXX-72, Acronym: -, Sponsor: -;Number: 61504167, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2019ZY-CXPT-03-05,2019ZY-CXPT-03-05,2018JM6010,2015JQ6263, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;Number: JM6010,JQ6263, Acronym: -, Sponsor: -;

Funding text:收稿日期: 2021-03-24; 修订日期: 2021-04-08 基金项目: 国家自然科学基金(61504167); 陕西省自然科学基金(2019ZY-CXPT-03-05,2018JM6010,2015JQ6263); 陕西省科技厅 人才项目(2017KJXX-72)资助 Supported by National Natural Science Foundation of China(61504167);Natural Science Foundation of Shaanxi Province (2019ZY-CXPT-03-05,2018JM6010,2015JQ6263);Talent Project of Science and Technology Department of Shaanxi Province (2017KJXX-72)

Database:Compendex

Accession number:20212510535091

Title:Preparation and Electromagnetic Wave Absorbing Mechanism of Helical Amorphous Carbon Nanotube/Bismaleimide (HACNT/BMI) Resin Composites

Title of translation:螺旋型非晶态碳纳米管/双马来酰亚胺树脂(HACNT/BMI)复合材料的制备及吸波机理

Authors:Zhu, Ruoxing (1, 2); Zhao, Tingkai (2); She, Shengfei (3); Li, Tiehu (2)

Author affiliation:(1) Library of Northwestern Polytechnical University, Xi'an; 710072, China; (2) School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an; 710072, China; (3) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Science, Xi'an; 710119, China

Source title:Cailiao Daobao/Materials Reports

Abbreviated source title:Cailiao Daobao/Mater. Rep.

Volume:35

Issue:10

Issue date:May 25, 2021

Publication year:2021

Pages:10216-10220

Language:Chinese

ISSN:1005023X

Document type:Journal article (JA)

Publisher:Cailiao Daobaoshe/ Materials Review

Abstract:<div data-language="eng" data-ev-field="abstract">New electromagnetic wave absorbing materials are the hotspot and focus of research in national defense science and technology. Carbonmaterials, as light absorbing materials, have been widely valued by researchers. In this study, we prepared helical amorphous carbon nanotube/bismaleimide (HACNT/BMI) resin composites and investigated their electromagnetic wave absorbing properties. We used helical amorphous carbon nanotubes as adsorbing agents, bismaleimide as matrix to prepare HACNT/BMI resin composites. Helical amorphous carbon nanotubes were prepared by floating catalytic chemical vapor deposition method. Scanning electron microscope (SEM), transmission electron microscope(TEM), X-ray diffractometer (XRD) and Raman spectroscopy were used to characterize the morphology and structure of samples. The electromagnetic parameters of HACNT/BMI composites were measured by vector network analyzer. The results showed that the increasing in the content of absorbing agent enhanced the electromagnetic wave absorbing properties of HACNT/BMI composites. The maximum absorption peak reached -18.35 dB, the widest absorbing bandwidth reached 2.56 GHz(9.52~12.08 GHz) when the R<inf>L</inf> belows -10 dB, and the reflection loss exceeded 97%. Moreover, the absorption peak of HACNT/BMI composites with higher content of HACNTs shifted towards lower frequency compared to that of the sample with lower content of HACNTs. Our results indicate that the helical structures of HACNTs plays an important role in enhancing the electromagnetic wave absorbing performance of HACNT/BMI composites. The HACNTs could increase the possibility of multiple reflection of electromagnetic wave and the path length of scattered waves. As a result, the energy loss of incident electromagnetic wave was increased.<br/></div> © 2021, Materials Review Magazine. All right reserved.

Number of references:21

Main heading:Transmission electron microscopy

Controlled terms:Chemical vapor deposition - Energy dissipation - Electric network analyzers - Scanning electron microscopy - Carbon nanotubes - Incident light - Resins - Amorphous carbon - Circular waveguides

Uncontrolled terms:Catalytic chemical vapor deposition - Electromagnetic parameters - Morphology and structures - Science and Technology - Vector network analyzers - Wave absorbing materials - Wave absorbing performance - Wave-absorbing property

Classification code:525.4 Energy Losses (industrial and residential) - 714.3 Waveguides - 741.1 Light/Optics - 761 Nanotechnology - 802.2 Chemical Reactions - 815.1.1 Organic Polymers - 933.1 Crystalline Solids - 933.2 Amorphous Solids

Numerical data indexing:Decibel -1.00e+01dB, Decibel -1.84e+01dB, Frequency 9.52e+09Hz to 1.21e+10Hz, Percentage 9.70e+01%

DOI:10.11896/cldb.20030156

Database:Compendex

Accession number:20214611146508

Title:Progress of NUV and FUV MCP-based photon-counting imaging detectors

Authors:Li, Shizhao (1); Liu, Yong-An (2); Sheng, Li-Zhi (2)

Author affiliation:(1) Chongqing Vocational Institute Of Engineering, Chongqing; 402260, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China

Corresponding author:Li, Shizhao(249427750@qq.com)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11915

Part number:1 of 1

Issue title:International Conference on Optics and Image Processing, ICOIP 2021

Issue date:2021

Publication year:2021

Article number:1191508

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510646957

Document type:Conference article (CA)

Conference name:2021 International Conference on Optics and Image Processing, ICOIP 2021

Conference date:June 4, 2021 - June 6, 2021

Conference location:Guilin, China

Conference code:173231

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">Photon counting imaging technology has been widely used in nuclear radiation detection, space environment detection, astronomy observation, nuclear physics and ultra-weak bioluminescence. In this paper, the progress and parameters of NUV (160-320nm) and FUV (102-170nm) photon-counting imaging detectors were described. The NUV detector was developed based on a sealed MCP-image intensifier which comprises input window, photocathode, MCP stack, Ge-layer and its ceramic substrate. To maximize the quantum efficiency, a Cesium Telluride (Cs2Te) photocathode was adopted, which was deposited on input window and mounted close to the MCP. For the FUV detector, because of the lower cut-off wavelength, there are no suitable window materials in this band and the open-faced design should be used to meet the requirements of the detection. Therefore, a Cesium Iodide (CsI) photocathode deposited on the input surface of the MCP was used to optimize detector efficiency. By using an existing wedge and strip anode (WSA), the imaging performance of the NUV and FUV detectors was tested respectively. Experimental results show that the quantum efficiency of Cs2Te is 12.1% (at 230nm), the spatial resolution of NUV and FUV detectors is better than 70μm, the dark count rate of NUV and FUV detectors is about 10.5- A nd 2.3-counts/s&lowast;cm2 respectively.<br/></div> © 2021 SPIE.

Number of references:6

Main heading:Photons

Controlled terms:Cesium iodide - Photocathodes - Tellurium compounds - Quantum efficiency

Uncontrolled terms:Environment detection - Imaging detector - Imaging technology - MCP - Nuclear radiations - Photon-counting imaging - Radiation detection - Space environment - Ultra-weak - Ultraviolet

Classification code:714.1 Electron Tubes - 741.3 Optical Devices and Systems - 804 Chemical Products Generally - 931.3 Atomic and Molecular Physics - 931.4 Quantum Theory; Quantum Mechanics

Numerical data indexing:Electric current 1.05E+01A, Percentage 1.21E+01%, Size 1.02E-07m to 1.70E-07m, Size 1.60E-07m to 3.20E-07m, Size 2.30E-07m, Size 7.00E-05m

DOI:10.1117/12.2605898

Database:Compendex

Accession number:20220211450487

Title:Standoff detection of explosive materials using time-gated UV-Raman spectroscopy

Authors:Wang, Bo (1, 2); Zhang, Pu (1); Zhang, Shuyao (3); Zhu, Xiangping (1); Zhao, Wei (1)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, No.17 Xinxi Road, New Industrial Park, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, No. 19 Yuquan Road, Shijingshan District, Beijing; 100049, China; (3) Northwest University, No.1 Xuefu Road, Guodu Edu. & Tech. Industrial Park, Xi'an; 710119, China

Corresponding author:Zhang, Pu

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12064

Part number:1 of 1

Issue title:AOPC 2021: Optical Spectroscopy and Imaging

Issue date:2021

Publication year:2021

Article number:120640Q

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510650039

Document type:Conference article (CA)

Conference name:2021 Applied Optics and Photonics China: Optical Spectroscopy and Imaging, AOPC 2021

Conference date:June 20, 2021 - June 22, 2021

Conference location:Beijing, China

Conference code:175875

Sponsor:Chinese Society for Optical Engineering

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">Improvised explosive devices (IED) and homemade explosives (HMEs) have become the preferred choice for terrorists and insurgents. It's a challenge to develop the techniques to detect explosive hazards at standoff distances. In this paper, a standoff UV Raman spectrum detection system for explosive detection was developed, which can realize 2-10m Raman spectrum detection of solid, solution and trace potassium nitrate samples. The relationship between Raman signal intensity (RSI) and pulse energy, detection distance and sample concentration was studied. The experimental results show that the RSI is approximately proportional to the pluse energy and contains nonlinear terms. It has an inverse square relationship with the detection distance and a linear relationship with the sample concentration. The concentration of solution and trace potassium nitrate samples of were successfully predicted at 2m distance, and the root mean square error of prediction (RMSEP) was 11.7 and 6.1, respectively.A simple and effective method for preparing trace potassium nitrate is presented.<br/></div> Copyright © 2021 SPIE.

Number of references:5

Main heading:Explosives detection

Controlled terms:Potash - Nitrates - Raman scattering - Explosives - Inverse problems - Mean square error - Potassium Nitrate - Raman spectroscopy

Uncontrolled terms:Detection of explosive materials - Explosive Detection - Explosive hazards - Improvised explosives devices - Raman signal intensity - Sample concentration - Spectrum detection - Standoff detection - Standoff Raman - UV-Raman spectroscopy

Classification code:741.1 Light/Optics - 801 Chemistry - 804.2 Inorganic Compounds - 922.2 Mathematical Statistics

Numerical data indexing:Size 2.00E+00m to 1.00E+01m, Size 2.00E+00m

DOI:10.1117/12.2606981

Funding details: Number: 2019B090917012, Acronym: -, Sponsor: -;Number: 62075237, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:We would like to acknowledge support from the Natural Science Foundation of China under Grant 62075237 and the Key Field Research and Development Plan Project of Guangdong Province 2019B090917012.

Database:Compendex

Accession number:20212110414100

Title:Testing Characterization and Simulating Optimization of High-power Laser Diode Array Chips

Title of translation:高功率半导体激光列阵芯片测试表征与仿真优化

Authors:Du, Yu-Qi (1, 2); Wang, Zhen-Fu (1); Zhang, Xiao-Ying (3); Yang, Guo-Wen (1); Li, Te (1); Liu, Yu-Xian (1, 2); Li, Bo (1, 2); Chang, Yi-Dong (1, 2); Zhao, Yu-Liang (1, 2); Lan, Yu (1, 2)

Corresponding author:Wang, Zhen-Fu(wzf2718@opt.ac.cn)

Source title:Faguang Xuebao/Chinese Journal of Luminescence

Abbreviated source title:Faguang Xuebao

Volume:42

Issue:5

Issue date:May 2021

Publication year:2021

Pages:674-681

Language:Chinese

ISSN:10007032

CODEN:FAXUEW

Document type:Journal article (JA)

Publisher:Editorial Office of Chinese Optics

Abstract:<div data-language="eng" data-ev-field="abstract">Due to small size, light weight, high efficiency and long operation life, high power semiconductor laser array chips have gradually entered into mass-markets and emerged applications, such as laser pumping, materials processing, medical therapy and lidar. However, limited by high-temperature working environments such as material processing, the development of high power semiconductor laser is hindered. Since laser diode arrays work in high-temperature working environments and generate great quantity during operating, the output power and reliability of high power semiconductor laser is decreased, which is caused by reducing in slope efficiency, increasing in threshold current, and wavelength redshift. Hence, it is vital to research the optoelectronic performance and laser diode array optimization of semiconductor laser under high temperature. To improve the high temperature performance of high-power semiconductor laser chips, firstly, the influence mechanism of environment temperature on internal quantum efficiency is analyzed theoretically. Secondly, in order to quantify the main factors affecting the stability of the chip, the high-power semiconductor laser array chips test system was built to study the characteristics of the laser diode array chips at 15-60℃, and analyze energy loss distribution at various temperatures. The experimental results show that when the temperature rises from 15℃ to 60℃, the percentage of carrier leakage loss increases sharply from 2.30% to 11.36%, which is the main factor affecting the high temperature operation of semiconductor laser array chips. Finally, the chip structure simulation shows that increasing the Al composition of the waveguide layer to 20% can effectively limit carrier leakage, balance the increase in series resistance caused by the increase of Al composition, and obtain high electro-optical conversion efficiency. This research can provide a reference for the design of high-temperature laser diode array chips.<br/></div> © 2021, Science Press. All right reserved.

Number of references:22

Main heading:Semiconductor lasers

Controlled terms:Energy dissipation - Optical radar - Power semiconductor diodes - Electric resistance - High temperature operations - Laser materials processing - Pumping (laser)

Uncontrolled terms:Energy loss distributions - Environment temperature - High power laser diode arrays - High power semiconductor laser - High temperature performance - Internal quantum efficiency - Materials processing - Semiconductor laser arrays

Classification code:525.4 Energy Losses (industrial and residential) - 701.1 Electricity: Basic Concepts and Phenomena - 714.2 Semiconductor Devices and Integrated Circuits - 716.2 Radar Systems and Equipment - 741.3 Optical Devices and Systems - 744.1 Lasers, General - 744.4.1 Semiconductor Lasers - 744.9 Laser Applications

Numerical data indexing:Percentage 2.00e+01%, Percentage 2.30e+00% to 1.14e+01%

DOI:10.37188/CJL.20210014

Funding details: Number: 61504167, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2019ZY-CXPT-03-05,2018JM6010,2015JQ6263, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;Number: 2017KJXX-72,2019ZY-CXPT-03-05,JM6010,JQ6263, Acronym: -, Sponsor: -;

Funding text:收稿日期: 2021-01-05; 修订日期: 2021-01-19 基金项目: 国家自然科学基金(61504167); 陕西省自然科学基金(2019ZY-CXPT-03-05,2018JM6010,2015JQ6263); 陕西省科技厅 人才项目(2017KJXX-72)资助 Supported by National Natural Science Foundation of China(61504167);Natural Science Foundation of Shaanxi Province (2019ZY-CXPT-03-05,2018JM6010,2015JQ6263); Talent Project of Science and Technology Department of Shaanxi Province (2017KJXX-72)

Database:Compendex

Accession number:20211410162170

Title:The effect of oceanic turbulence on optical receiving systems

Authors:Sun, Shu-Wei (1, 2); Kang, Fu-Zeng (1); Wang, Hao (1, 2)

Corresponding author:Kang, Fu-Zeng

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11763

Part number:1 of 1

Issue title:Seventh Symposium on Novel Photoelectronic Detection Technology and Applications

Issue date:2021

Publication year:2021

Article number:1176354

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510643611

Document type:Conference article (CA)

Conference name:7th Symposium on Novel Photoelectronic Detection Technology and Applications

Conference date:November 5, 2020 - November 7, 2020

Conference location:Kunming, China

Conference code:167886

Sponsor:Chinese Society for Optical Engineering (CSOE); Science and Technology on Low-light-level Night Vision Laboratory

Publisher:SPIE

Abstract:With the development of underwater optical communication, imaging and sensing, studies of the effect of oceanic turbulence on optical receiving systems have received increasing attention and become a research focus. Until now, the effect of atmosphere turbulence on optical receiving systems have studied widely and in depth, but those in oceanic turbulence have been researched seldom. It is known that the atmosphere turbulence is induced by the temperature fluctuation, while the oceanic turbulence is induced by both the temperature fluctuation and the salinity fluctuation. Thus, the behavior of laser propagation through oceanic turbulence is very different from that in atmosphere turbulence.The paper focuses on the influence of phase disturbance of optical signal caused by oceanic turbulence on optical receiving, including the theoretical modeling of couple efficiency of space optical signal into single-mode fiber received by annular aperture and the variance of angle-of-arrival (AOA) fluctuation received by finite aperture. The research shows that the couple efficiency of single-mode fiber and the variance of angle-of-arrival fluctuation in oceanic turbulence depend on propagation distance, receiving aperture and oceanic turbulence parameter. The results obtained in this paper will be useful for optical receiving systems involving oceanic turbulence channels.<br/> © 2021 SPIE

Number of references:12

Main heading:Efficiency

Controlled terms:Single mode fibers - Temperature distribution - Direction of arrival - Light propagation - Underwater optical wireless communication

Uncontrolled terms:Angle of arrival fluctuations - Atmosphere turbulence - Propagation distances - Receiving aperture - Salinity fluctuation - Temperature fluctuation - Theoretical modeling - Underwater optical communications

Classification code:641.1 Thermodynamics - 675 Marine Engineering - 716.1 Information Theory and Signal Processing - 741.1 Light/Optics - 741.1.2 Fiber Optics - 913.1 Production Engineering

DOI:10.1117/12.2587149

Database:Compendex

Accession number:20211810295262

Title:Unobtrusive vital signs and activity monitoring based on dual mode fiber

Authors:Xu, Wei (1, 2); Bian, Shihang (3); Dong, Bo (1, 2, 4); Shen, Ying (3); Han, Shuying (3); Yu, Changyuan (5); Zhao, Wei (1, 2, 4); Wang, Yishan (1, 2, 4)

Corresponding author:Dong, Bo(dbo1978@163.com)

Source title:Optical Fiber Technology

Abbreviated source title:Opt. Fiber Technol.

Volume:64

Issue date:July 2021

Publication year:2021

Article number:102530

Language:English

ISSN:10685200

CODEN:OFTEFV

Document type:Journal article (JA)

Publisher:Academic Press Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">A solid unobtrusive fiber-optic sensor based on modal interference in dual mode fiber (DMF) embedded in a thin mat is proposed and investigated theoretically and experimentally, realizing real-time vital signs and activity monitoring. The whole sensing setup only consists of one laser diode, one section of DMF, one photo-detector and few standard single mode fibers (SMFs). The DMF fiber is sandwiched into the SMFs using core-offset splicing, i.e., SMF-DMF-SMF structure. The optimal value of the core offset is numerically simulated and experimentally validated. It has to be noted that all the fibers used in the experiment are with 900-μm protection jacket, which can effectively avoid fiber breaking. The proposed sensor is both investigated in different postures and different subjects. And the results of vital signs monitoring performance show great consistency compared with commercial monitors. Besides, the activity monitoring is also addressed with one-second discrimination resolution, identifying three basic states, i.e., on bed, body movement and off bed. It is easy to fabricate and shows great potential in future non-invasive vital signs and activity monitoring applications.<br/></div> © 2021 Elsevier Inc.

Number of references:29

Main heading:Single mode fibers

Controlled terms:Structural optimization - Patient monitoring - Fiber optic sensors

Uncontrolled terms:Activity monitoring - Body movements - Dual-mode fibers - Modal interference - Optimal values - Standard single mode fibers - Vital sign - Vital signs monitoring

Classification code:461.6 Medicine and Pharmacology - 741.1.2 Fiber Optics - 921.5 Optimization Techniques

Numerical data indexing:Size 9.00e-04m

DOI:10.1016/j.yofte.2021.102530

Funding details: Number: Y829321213, Acronym: -, Sponsor: -;Number: 61971372, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:The work is partially financially supported by the CAS Pioneer Hundred Talents Program (Y829321213) and National Natural Science Foundation of China (61971372).

Database:Compendex

Accession number:20213410819650

Title:Femtosecond Chirped Pulse Amplification System with Liquid Crystal Spatial Light Modulator for Spectral Modulation

Title of translation:基于液晶空间光调制器进行光谱调制的飞秒啁啾脉冲放大系统

Authors:Duan, Yufei (1, 2); Li, Feng (1); Yang, Zhi (1); Li, Qianglong (1); Yang, Yang (1); Wu, Tianhao (1, 2); Wang, Yishan (1); Yang, Xiaojun (1)

Corresponding authors:Li, Feng(lifeng@opt.ac.cn); Yang, Xiaojun(yxj@opt.ac.cn)

Source title:Zhongguo Jiguang/Chinese Journal of Lasers

Abbreviated source title:Zhongguo Jiguang

Volume:48

Issue:11

Issue date:June 10, 2021

Publication year:2021

Article number:1101001

Language:Chinese

ISSN:02587025

CODEN:ZHJIDO

Document type:Journal article (JA)

Publisher:Science Press

Abstract:<div data-language="eng" data-ev-field="abstract">Objective: Compared with traditional solid-state lasers, such as slats and wafers, femtosecond fiber lasers have many advantages, including compact structures, good beam quality, stable systems, and good heat dissipation. They are widely used in various application fields, particularly in the field of fine material processing. The current femtosecond fiber laser is mainly used to reduce the problems of nonlinearity and device damage in the amplification process using the chirped pulse amplification technology to obtain a femtosecond laser with its peak power and narrow pulse width meeting processing requirements. Owing to the increase in the energy demand of an industrial fiber laser, the amplification classes also gradually increase, rendering the narrowing effect due to an uneven gain medium increasingly severe and influencing the final spectral width. Thus, its occurrence increases the compressed pulse width limit, reduces the pulse peak power, and severely impacts the thermal diffusion in processing. Currently, the gain narrowing problem of a femtosecond fiber laser can be solved using self-phase modulation, a new amplifying stage system, or dielectric layer filters. However, these approaches can only form fixed spectral modulation, which cannot solve the gain narrowing problem in different amplification or laser systems with different power requirements of the same amplification system. Therefore, programmable devices are proposed to achieve the controllability of spectral modulation. Among them, the liquid crystal spatial light modulator, a common element for beam shaping and pulse shaping, exhibits higher regulating precision than the general acousto-optic filter. For a fiber laser seed source, its spectral width is only a few nanometers or tens of nanometers; the liquid crystal spatial light modulator is more suitable for fiber laser spectral modulation. This study focuses on the characteristics of the spatial light modulator and the requirement of a chirp pulse amplification system for spectral modulation. The solutions of a spectral shaping system are proposed based on the two-dimensional (2D) intensity-type liquid crystal spatial light modulator for spectral modulation. The chirped pulse amplification system eliminates the gain narrowing problem and achieves a narrower output pulse duration. Methods: Herein, the 2D intensity-type liquid crystal spatial light modulator was used for spectral modulation. First, the seed source is amplified using the single-mode amplification system and enters the spectral shaping system, which comprises the polarization-splitting prism, grating, and the intensity of reflection-type liquid crystal spatial light modulator to perform various spectral modulation shapes and verify the programmability and high precision of the spectral shaping system. Then, the subsequent multi-mode amplification and main amplification systems with an optical fiber aperture of 25 μm were established. The shape required for spectral shaping, which can be compared with the initial spectrum function to achieve a 2D grayscale map, was obtained using the step-by-step Fourier transform method combined with reverse operation. Next, the grayscale image was loaded into the spatial light modulator, and the spectral widths before and after the addition of the grayscale image were compared to investigate the influence of the shaping system on the spectra and the reasons for the spectral shape formation. Finally, the near-limited output pulse duration of the femtosecond laser was obtained by compressing an appropriate distance by the 1450 line/mm grating, and the pulse duration was measured using an autocorrelation instrument to determine the optimization results of pulse duration. Results and Discussions: The spectrum can be reshaped into flat-top, central-depression, triangle, continuous- depression, and other shapes using the spectral shaping system (Fig.4). Generally, as the spectral shaping becomes more complex and its shaping effect becomes worse, the modulation of the liquid crystal void generated using the liquid crystal spatial light modulator becomes increasingly obvious. After adding the main amplification system, the spectral width before entering the amplification system is reduced by approximately 1.5 nm (Fig.5) and the gain narrowing effect is evident. The grayscale map obtained using reverse operation was loaded on the 2D liquid crystal spatial light modulator to obtain the super-Gaussian spectral shape (Fig.6) after spectral shaping and amplification. The full width at half maximum of this spectrum is approximately 9.5 nm. The spectral width is approximately 2.5 nm, and the corresponding limited pulse duration is reduced from 222 fs to approximately 164 fs. Finally, the pulse duration of 170 fs, close to the limit, can be obtained after the laser with spectral shaping is compressed through the grating. Compared with that of direct compression, the pulse duration is decreased by 86 fs. Moreover, the pulse shape has a side lobe owing to the liquid crystal spacing problem of the liquid crystal spatial light modulator (Fig.7). Conclusions: Results show that the spectral shaping system can realize the arbitrary spectral modulation using the liquid crystal spatial light modulator. It can also set the spectral bandpass characteristics by regulating the function of different spectral component gains and realize dynamic matching using the subsequent amplification spectrum. Thus, this system is suitable for different conditions of gain spectrum modulation demand and can achieve a pulse duration close to the limit to meet the narrow output pulse duration and peak power of a femtosecond laser. Moreover, it achieves the purpose of efficient material cold working and satisfies the high requirements of the thermal effect for femtosecond laser applications. However, the improved results can be obtained using a modulator with a higher filling rate and smaller clearance for spectral shaping.<br/></div> © 2021, Chinese Lasers Press. All right reserved.

Number of references:20

Main heading:Fibers

Controlled terms:Light modulators - Phase modulation - Spectroscopy - Fiber lasers - Light modulation - Laser materials processing - Liquid crystals - Ultrashort pulses - Chirp modulation - Optical pulse shaping

Uncontrolled terms:Bandpass characteristics - Chirp pulse amplification system - Chirped pulse amplification systems - Chirped pulse amplifications - Femtosecond fiber lasers - Fourier transform method - Liquid crystal spatial light modulators - Spatial light modulators

Classification code:713.4 Pulse Circuits - 716 Telecommunication; Radar, Radio and Television - 741.1 Light/Optics - 744.4 Solid State Lasers - 744.9 Laser Applications

Numerical data indexing:Size 1.50e-09m, Size 2.50e-05m, Size 2.50e-09m, Size 9.50e-09m, Time 1.64e-13s, Time 1.70e-13s, Time 8.60e-14s

DOI:10.3788/CJL202148.1101001

Database:Compendex

Accession number:20210909995006

Title:Free-carrier-assisted mid-infrared microcavity soliton generation (Open Access)

Authors:Fan, Weichen (1, 2); Sun, Qibing (1, 2); Lu, Zhizhou (1, 2); Wang, Leiran (1, 2); Zhao, Wei (1, 2); Zhang, Wenfu (1, 2)

Source title:Journal of Applied Physics

Abbreviated source title:J Appl Phys

Volume:129

Issue:8

Issue date:February 28, 2021

Publication year:2021

Article number:083106

Language:English

ISSN:00218979

E-ISSN:10897550

CODEN:JAPIAU

Document type:Journal article (JA)

Publisher:American Institute of Physics Inc.

Abstract:Multi-photon absorption (MPA) and free-carrier (FC) effects, usually considered to be detrimental to microcomb generation by introducing strong nonlinear loss, also offer opportunities to overwhelm the thermal-optic effect by modifying the refractive index. Here, we derive the theoretical expression of solitons expanded with MPA and FC effects, accompanied by numerical simulations to reveal the dynamics and mechanism for capturing steady mid-infrared solitons in both Si and Ge microcavities. It is found that with increased FC lifetime, the intensity-dependent MPA underlies non-monotonous variation of nonlinear detuning which enables soliton generation. More interestingly, proper control on the FC lifetime admits bidirectional switching of soliton states (i.e., both decreasing and increasing the number of solitons) as well as self-starting solitons, yielding different technique routes toward microcavity solitons. This research could contribute to a better understanding of nonlinear behaviors influenced by FC effects and find practical applications by releasing the demand on precise control of laser sources, which is especially meaningful for the mid-infrared region.<br/> © 2021 Author(s).

Number of references:36

Main heading:Solitons

Controlled terms:Refractive index - Multiphoton processes - Infrared devices - Microcavities

Uncontrolled terms:Intensity-dependent - Mid-infrared regions - Multi-photon absorption - Nonlinear behavior - Nonlinear loss - Precise control - Soliton generation - Theoretical expression

Classification code:714 Electronic Components and Tubes - 741.1 Light/Optics

DOI:10.1063/5.0037921

Funding details: Number: 61635013,61675231,61705257,61805277, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: XDB24030600, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2016353, Acronym: -, Sponsor: Youth Innovation Promotion Association of the Chinese Academy of Sciences;

Funding text:The authors thank Hairun Guo and Xiaohong Hu for valuable discussions. The authors acknowledge the support from the National Natural Science Foundation of China (NNSFC) (Grant Nos. 61635013, 61675231, 61705257, and 61805277), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB24030600), and the Youth Innovation Promotion Association of CAS (No. 2016353).

Database:Compendex

Open Access type(s): All Open Access, Green

Accession number:20212510544803

Title:Intensity Demodulation Technology of FBG Time Division Multiplexing Based on Sagnac Ring

Title of translation:基于Sagnac环的FBG时分复用强度解调技术

Authors:Wang, Xiaoli (1, 2); Dong, Bo (1); Chen, Enqing (1, 2); Li, Yang (1, 2)

Corresponding author:Dong, Bo(bdong@opt.ac.cn)

Source title:Guangzi Xuebao/Acta Photonica Sinica

Abbreviated source title:Guangzi Xuebao

Volume:50

Issue:5

Issue date:May 25, 2021

Publication year:2021

Article number:0506003

Language:Chinese

ISSN:10044213

CODEN:GUXUED

Document type:Journal article (JA)

Publisher:Chinese Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">A method of fiber Bragg grating time-division multiplexing intensity demodulation based on Sagnac fiber ring is presented. The time-multiplexing sensing system, consisted of the several FBG gratings with the same central-wavelength, can demodulate the signals by observing the intensity changes of the output spectrum of the FBG gratings. In the signal processing module, the wavelet analysis and Gaussian simulation algorithm are combined to demodulate the system signal together. The experimental results show that the signal-to-noise ratio of the system signal is increased by about 36% from 8.06 dB to 11.7 dB, which effectively improves the anti-interference ability of the system and the detection accuracy for the external parameters. The proposed method effectively increases the number of fiber Bragg grating sensors in the demodulation system with less cost and can be widely applied to various sensor systems or parameter detection systems.<br/></div> © 2021, Science Press. All right reserved.

Number of references:23

Main heading:Fiber Bragg gratings

Controlled terms:Demodulation - Fiber optic sensors - Optical signal processing - Optical variables measurement - Signal to noise ratio - Time division multiplexing

Uncontrolled terms:Anti-interference - Central wavelength - Demodulation system - Detection accuracy - Fiber Bragg Grating Sensors - Gaussian simulations - Intensity demodulation - Parameter detection

Classification code:716.1 Information Theory and Signal Processing - 741.1.2 Fiber Optics - 941.4 Optical Variables Measurements

Numerical data indexing:Decibel 8.06e+00dB to 1.17e+01dB, Percentage 3.60e+01%

DOI:10.3788/gzxb20215005.0506003

Funding details: Number: Y829321213, Acronym: CAS, Sponsor: Chinese Academy of Sciences;

Funding text:Hundred Talents Program of Chinese Academy of Sciences (No. Y829321213).

Database:Compendex

Accession number:20213310780852

Title:Compact 2D serpentine optical phased array

Authors:Ren, Yangming (1, 2); Zhang, Lingxuan (1, 2); Zhao, Wei (1, 2); Wang, Guoxi (1, 2); Feng, NingNing (1, 2); Wu, Wei (1, 2); Sun, Xiaochen (1, 2); Zhang, Wenfu (1, 2)

Source title:Applied Optics

Abbreviated source title:Appl. Opt.

Volume:60

Issue:24

Issue date:August 20, 2021

Publication year:2021

Pages:7158-7163

Language:English

ISSN:1559128X

E-ISSN:21553165

CODEN:APOPAI

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">We present a two-dimensional (2D) Si photonics optical phased array (OPA) using a serpentine design which eliminates the long directional couplers used in many 2D OPA designs. It significantly reduces the distance between the antenna benefitting far-field sidelobe reduction while maintaining high optical power use efficiency.<br/></div> © 2021 Optical Society of America

Number of references:25

Main heading:Serpentine

Controlled terms:Silicon

Uncontrolled terms:Far field - High optical power - Optical phased arrays - Si photonics - Side-lobe reduction - Two Dimensional (2 D) - Use efficiency

Classification code:482.2 Minerals - 549.3 Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals

DOI:10.1364/AO.431942

Funding details: Number: 201903, Acronym: -, Sponsor: -;Number: 12004421,61635013,61675231, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: XDB24030600, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2019JQ-447, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;Number: 2016535, Acronym: YIPA, Sponsor: Youth Innovation Promotion Association;Number: XAB2017A09, Acronym: -, Sponsor: West Light Foundation of the Chinese Academy of Sciences;

Funding text:Strategic Priority Research Program of the Chinese Academy of Sciences (XDB24030600); National Natural Science Foundation of China (12004421, 61635013, 61675231); Youth Innovation Promotion Association (2016535); West Light Foundation of the Chinese Academy of Sciences (XAB2017A09); Natural Science Foundation of Shaanxi Province (2019JQ-447); Research Project of Xi'an Postdoctoral Innovation Base (201903).Funding. Strategic Priority Research Program of the Chinese Academy of Sciences (XDB24030600); National Natural Science Foundation of China (12004421, 61635013, 61675231); Youth Innovation Promotion Association (2016535); West Light Foundation of the Chinese Academy of Sciences (XAB2017A09); Natural Science Foundation of Shaanxi Province (2019JQ-447); Research Project of Xi’an Postdoctoral Innovation Base (201903).

Database:Compendex

Accession number:20214611156548

Title:Effective suppression of mode distortion induced by stimulated Raman scattering in high-power fiber amplifiers

Authors:Gao, Wei (1, 2, 3); Fan, Wenhui (1, 3, 5); Ju, Pei (1, 3); Li, Gang (1, 3); Zhang, Yanpeng (2); He, Aifeng (4); Gao, Qi (1, 3); Li, Zhe (1, 3)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Shaanxi Key Laboratory of Information Photonic Technique, Xi'An Jiaotong University, Xi'an; 710049, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China; (4) Key Laboratory on Applied Physics and Chemistry, Shaanxi Applied Physics and Chemistry Research Institute, Xi'an; 710061, China; (5) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China

Corresponding authors:Fan, Wenhui(fanwh@opt.ac.cn); Zhang, Yanpeng(fanwh@opt.ac.cn)

Source title:High Power Laser Science and Engineering

Abbreviated source title:High Power Laser Sci. Eng.

Issue date:2021

Publication year:2021

Article number:e20

Language:English

E-ISSN:20523289

Document type:Article in Press

Publisher:Cambridge University Press

Abstract:<div data-language="eng" data-ev-field="abstract">Mode distortion induced by stimulated Raman scattering (SRS) has become a new obstacle for the further development of high-power fiber lasers with high beam quality. Here, an approach for effective suppression of the SRS-induced mode distortion in high-power fiber amplifiers has been demonstrated experimentally by adjusting the seed power (output power of seed source) and forward feedback coefficient of the rear port in the seed source. It is shown that the threshold power of the SRS-induced mode distortion can be increased significantly by reducing the seed power or the forward feedback coefficient. Moreover, it has also been found that the threshold power is extremely sensitive to the forward feedback power value from the rear port. The influence of the seed power on the threshold power can be attributed to the fact that the seed power plays an important role in the effective length of the gain fiber in the amplifier. The influence of the forward feedback coefficient on the threshold power can be attributed to the enhanced SRS configuration because the end surface of the rear port together with the fiber in the amplifier constitutes a half-opening cavity. This suppression approach will be very helpful to further develop the high-power fiber amplifiers with high beam quality.<br/></div> © The Author(s), 2021. Published by Cambridge University Press in association with Chinese Laser Press.

Number of references:42

Main heading:Stimulated Raman scattering

Controlled terms:Feedback amplifiers - Fiber amplifiers - Fiber lasers - Fibers

Uncontrolled terms:Effective suppression - High beam quality - High power fiber amplifier - High power fiber lasers - Mode distortion - Output power - Stimulated raman scatterings (SRS) - Threshold power

Classification code:711 Electromagnetic Waves - 713.1 Amplifiers - 741.1 Light/Optics - 744.4 Solid State Lasers

DOI:10.1017/hpl.2021.13

Database:Compendex

Accession number:20211910311300

Title:Force and Torque Analysis of Micro-sized Particles in Perfect Optical Vortex Beams

Title of translation:完美涡旋光中微米级粒子的受力与力矩特性分析

Authors:Zhang, Yanan (1, 2); Li, Manman (1); Yan, Shaohui (1); Zhou, Yuan (1, 2); Li, Xing (1, 2); Yao, Baoli (1, 2)

Corresponding author:Yao, Baoli(yaobl@opt.ac.cn)

Source title:Guangzi Xuebao/Acta Photonica Sinica

Abbreviated source title:Guangzi Xuebao

Volume:50

Issue:3

Issue date:March 25, 2021

Publication year:2021

Article number:0308002

Language:Chinese

ISSN:10044213

CODEN:GUXUED

Document type:Journal article (JA)

Publisher:Chinese Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">Based on the tightly focusing approach, the perfect optical vortex beams are generated at the geometric focal plane. The optical forces and torques exerted on the micro-sized particle in the perfect optical vortex beams are calculated. Numerical results show that the micro-sized particle is trapped on the ring of perfect optical vortex beams and is driven to rotate around the optical axis. The orbital torque will firstly increases and then tends to be stable with the increase of the topological charge value. In addition, the influence of circular polarization state, radial polarization state and azimuthal polarization state on the force and orbital torque of micro-sized particles are investigated in perfect optical vortex beams. The results show that the state of polarization of perfect optical vortex beams will affect the optically induced orbital motion to some extent. The circular polarization state of perfect optical vortex beams is superior to drive the orbital motion of the particle.<br/></div> © 2021, Science Press. All right reserved.

Number of references:30

Main heading:Torque

Controlled terms:Vortex flow - Circular polarization

Uncontrolled terms:Azimuthal polarization - Circular polarization state - Force and torques - Micro-sized particles - Optical vortex beam - Radial polarization - State of polarization - Topological charges

Classification code:631.1 Fluid Flow, General - 701.1 Electricity: Basic Concepts and Phenomena - 711 Electromagnetic Waves - 931.2 Physical Properties of Gases, Liquids and Solids

DOI:10.3788/gzxb20215003.0308002

Funding details: Number: 11904395,11974417, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:item：National Natural Science Foundation of China（Nos. 11974417，11904395）

Database:Compendex

Accession number:20211410162136

Title:X-ray communication experiment using photocathode X-ray tube

Authors:Liu, Yong-An (1, 2); Xuan, Hao (1, 2); Sheng, Li-Zhi (1); Qiang, Peng-Fei (1); Su, Tong (1); Tian, Jin-Shou (1); Zhao, Bao-Sheng (1)

Corresponding author:Liu, Yong-An(liuya@opt.ac.cn)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11763

Part number:1 of 1

Issue title:Seventh Symposium on Novel Photoelectronic Detection Technology and Applications

Issue date:2021

Publication year:2021

Article number:117638U

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510643611

Document type:Conference article (CA)

Conference name:7th Symposium on Novel Photoelectronic Detection Technology and Applications

Conference date:November 5, 2020 - November 7, 2020

Conference location:Kunming, China

Conference code:167886

Sponsor:Chinese Society for Optical Engineering (CSOE); Science and Technology on Low-light-level Night Vision Laboratory

Publisher:SPIE

Abstract:In this paper, a novel X-ray tube, which uses a photocathode as an electron emission source, is first introduced. The X-ray tube with photocathode can use an external light source to control the output of photoelectrons, thereby controlling the characteristics of the emitted X-rays. Compared with the traditional X-ray tube with hot cathode, the X-ray emitted by the photocathode X-ray tube is completely modulated by the external light source. Therefore, X-rays can achieve instant on-off and arbitrary pulse waveform emission, and have extremely high time resolution. The basic characteristics of the photocathode X-ray tube was tested. By using the developed X-ray tube and LED light source, preliminary X-ray communication experiments have been carried out. The results show that the digital signal restoration with a frequency of up to 1MHz can be achieved. Except for X-ray communication, the developed photocathode X-ray tube can also have important applications in many fields such as radiation calibration and scintillator afterglow measurement.<br/> © 2021 SPIE

Number of references:11

Main heading:Light sources

Controlled terms:Photocathodes - Signal reconstruction - Electron emission - Tubes (components) - X ray tubes - Light

Uncontrolled terms:Arbitrary pulse - Basic characteristics - Digital signals - Electron emission sources - High-time resolution - Hot cathodes - LED light source - Radiation calibration

Classification code:619.1 Pipe, Piping and Pipelines - 714.1 Electron Tubes - 716.1 Information Theory and Signal Processing - 741.1 Light/Optics - 741.3 Optical Devices and Systems

Numerical data indexing:Frequency 1.00e+06Hz

DOI:10.1117/12.2587619

Funding details: Number: XAB2018A07, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2018438, Acronym: -, Sponsor: Youth Innovation Promotion Association of the Chinese Academy of Sciences;

Funding text:This work was supported by the CAS "Light of West China" Program (No. XAB2018A07) and the Youth Innovation Promotion Association CAS (No.2018438).This work was supported by the CAS "Light of West China" Program (No. XAB2018A07) andthe Youth Innovation

Database:Compendex

Accession number:20220211442601

Title:Optical design of a light-controlled pulsed x-ray source with photocathode

Authors:Zhang, Xuehan (1, 2); Sheng, Lizhi (1); Qiang, Pengfei (1); Xuan, Hao (1, 2); Liu, Yongan (1); Zhao, Baosheng (1)

Corresponding author:Sheng, Lizhi(lizhi_sheng@opt.ac.cn)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12062

Part number:1 of 1

Issue title:AOPC 2021: Optoelectronics and Nanophotonics

Issue date:2021

Publication year:2021

Article number:120620N

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510649996

Document type:Conference article (CA)

Conference name:2021 Applied Optics and Photonics China: Optoelectronics and Nanophotonics, AOPC 2021

Conference date:June 20, 2021 - June 22, 2021

Conference location:Beijing, China

Conference code:175866

Sponsor:Chinese Society for Optical Engineering

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">X-rays have the characteristics of high single photon energy, high frequency, and strong penetrating ability, are widely used in space communication, radiation imaging, medical diagnosis, non-destructive testing, and other fields. The development of X-rays has had a positive impact on broadening the use of the electromagnetic spectrum. As the core component of the X-ray application, high modulation rate, low power consumption, and excellent performance X-ray generators have been a hot research topic for decades. In this paper, a light-controlled pulsed X-ray source is modeled by simulation software. We perform simulation calculations and summary analysis on the effects of cathode structure, focus structure height, and metal anode voltage on the focal spot size, electron transit-time, and transit-time spread. At an operating voltage of 30KV, if the photocathode is 42mm in diameter, the focal spot diameter is about 1.5mm, the electron transit-time is 3.75ns, and the transit-time spread is 895ps when the focusing structure height is 6mm. And if the diameter of the photocathode is 12mm, the focal spot diameter is the smallest when the focusing pole height is 9mm, which is about 0.7mm, as for the time characteristics, the electron transit-time is 4.1ns, and the transit-time spread is 242ps. The results suggest that the light-controlled pulsed X-ray source is expected to be the next-generation source with easy modulation and short X-ray pulse properties.<br/></div> © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

Number of references:13

Main heading:Diagnosis

Controlled terms:Medical imaging - Optical design - Photocathodes - Nondestructive examination - X ray apparatus - Modulation - Computer software - Electron sources - Particle beams

Uncontrolled terms:Electron transit time - Fast response - Focal-spot - Photocathode - Pulsed X-ray source - Pulsed x-ray sources - Pulsed X-rays - Spots diameter - Transit time spread - X-ray sources

Classification code:461.1 Biomedical Engineering - 461.6 Medicine and Pharmacology - 714.1 Electron Tubes - 723 Computer Software, Data Handling and Applications - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 746 Imaging Techniques - 932.1 High Energy Physics

Numerical data indexing:Size 1.20E-02m, Size 1.50E-03m, Size 4.20E-02m, Size 6.00E-03m, Size 7.00E-04m, Size 9.00E-03m, Time 2.42E-10s, Time 3.75E-09s, Time 4.10E-09s, Time 8.95E-10s

DOI:10.1117/12.2606631

Funding details: Number: SKLIPR2021, Acronym: -, Sponsor: -;Number: 61901470, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: XAB2018A07,XAB2020YN13, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: -, Acronym: -, Sponsor: Shanxi Provincial Key Research and Development Project;

Funding text:This work has been supported by the National Natural Science Foundation of China (Grant No.61901470), the Key Research and Development Program of Shaanxi Province (Grant No.2020GY-032), CAS "Light of West China" Program (Grant No. XAB2018A07), CAS "Light of West China" Program (Grant No. XAB2020YN13), and the Foundation of State Key Laboratory of China (Grant No. SKLIPR2021).

Database:Compendex

Accession number:20211710263888

Title:Direct axial plane imaging of particle manipulation with nondiffracting Bessel beams

Authors:An, Sha (1, 2); Peng, Tong (1, 2); Yan, Shaohui (1); Zhang, Peng (1); Li, Manman (1); Yao, Baoli (1, 2)

Corresponding author:Yao, Baoli(yaobl@opt.ac.cn)

Source title:Applied Optics

Abbreviated source title:Appl. Opt.

Volume:60

Issue:11

Issue date:April 10, 2021

Publication year:2021

Pages:2974-2980

Language:English

ISSN:1559128X

E-ISSN:21553165

CODEN:APOPAI

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">Optical manipulation with nondiffracting beams has been attracting great interest and finding widespread applications in many fields such as chemistry, physics, and biomedicine. Generally, optical manipulation is conducted in an optical microscopy system, which, in general, only allows for imaging motions of particles in the transverse plane, rendering the observation of dynamics processes occurring in the axial plane impractical.We propose and demonstrate an optical manipulation system that incorporates an axial plane imaging module. With this system, the trapping behavior in the transverse plane and the transportation process in the axial plane of a particle immersed in a Bessel beamwere acquired simultaneously in real time.<br/></div> © 2021 Optical Society of America.

Number of references:40

Main heading:Laser beams

Controlled terms:Optical constants

Uncontrolled terms:Axial planes - Bessel beam - Nondiffracting - Nondiffracting beam - Optical manipulation - Particle manipulation - Transportation process - Transverse planes

Classification code:741.1 Light/Optics - 744.8 Laser Beam Interactions

DOI:10.1364/AO.417854

Funding details: Number: 11904395,11974417,61705256, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:Funding. National Natural Science Foundation of China (11904395, 11974417, 61705256).

Database:Compendex

Accession number:20215011321631

Title:Theoretical and Experimental Research of X-ray Communication in Shielded Environment

Title of translation:屏蔽环境下X射线通信传输理论与实验研究

Authors:Zhang, Xuehan (1, 2); Su, Tong (1); Sheng, Lizhi (1); Liu, Yongan (1); Zhao, Baosheng (1)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Science, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Su, Tong(sutong@opt.ac.cn)

Source title:Guangzi Xuebao/Acta Photonica Sinica

Abbreviated source title:Guangzi Xuebao

Volume:50

Issue:11

Issue date:November 25, 2021

Publication year:2021

Article number:1134002

Language:Chinese

ISSN:10044213

CODEN:GUXUED

Document type:Journal article (JA)

Publisher:Chinese Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">Based on the theoretical model of the interaction between X-rays and matter, the transmission characteristics of X-rays in an electromagnetic shielding environment are studied, and the feasibility of X-rays communication for information transmission in an electromagnetic shielding environment is theoretically demonstrated. After that, a numerical simulation model of X-ray communication in a shielded environment is established, and the communication parameters of X-rays in an electromagnetic shielded environment are analyzed to achieve the index constraint of the core components. Finally, based on the key technologies of X-ray modulated emission and single-photon X-ray detection, an equivalent verification experiment of X-ray passing through the shielding material is conducted to realize the experimental verification of X-ray communication with a communication rate better than 23 kbps. The results are expected to provide some theoretical basis and experimental foundation for solving the radiation data transmission in a shielded environment.<br/></div> © 2021, Science Press. All right reserved.

Number of references:27

Main heading:Particle beams

Controlled terms:Electromagnetic shielding - Transmissions

Uncontrolled terms:Experimental research - Information transmission - Numerical simulation models - Power transmission equations - Theoretical modeling - Theoretical research - Transmission characteristics - X-ray communication - X-ray detections - X-ray sources

Classification code:602.2 Mechanical Transmissions - 932.1 High Energy Physics

Numerical data indexing:Bit rate 2.30E+04bit/s

DOI:10.3788/gzxb20215011.1134002

Funding details: Number: 61901470, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2020GY-032, Acronym: -, Sponsor: Shanxi Provincial Key Research and Development Project;

Funding text:National Natural Science Foundation of China (No.61901470), Key Research and Development Program of Shaanxi Province (No. 2020GY-032)

Database:Compendex

Accession number:20211910328976

Title:A sealed X-ray microchannel plate imager with CsI photocathode to improve quantitative precision of framing camera

Authors:Yang, Yang (1, 2); Zhu, Bingli (1, 2); Gou, Yongsheng (1); Chen, Zhen (1, 2); Bai, Xiaohong (1, 5); Qin, Junjun (1, 5); Bai, Yonglin (1, 2); Liu, Baiyu (1); Cao, Weiwei (1, 4); Wang, Bo (1, 2); Xu, Peng (1, 3)

Author affiliation:(1) Key Laboratory of Ultrafast Photoelectric Diagnostic Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) University of Chinese Academy of Sciences, Beijing; 100091, China; (4) Key Laboratory for Physical Electronics and Devices of the Ministry of Education and Shaanxi Key Laboratory of Information Photonic Technique, Xi'an Jiaotong University, Xi'an; 710049, China; (5) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China

Corresponding author:Bai, Yonglin(baiyonglin@opt.ac.cn)

Source title:Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

Abbreviated source title:Nucl Instrum Methods Phys Res Sect A

Volume:1005

Issue date:July 21, 2021

Publication year:2021

Article number:165404

Language:English

ISSN:01689002

CODEN:NIMAER

Document type:Journal article (JA)

Publisher:Elsevier B.V.

Abstract:<div data-language="eng" data-ev-field="abstract">In this paper, we propose a hermetically sealed X-ray microchannel plate imager as a more effective and stable alternative to the traditional open-structured imager. With two microstrip photocathodes of 100 nm Au and 100 nm CsI, respectively, the proposed imager has a measured exposure time of 65 ps when applied with a 200 ps width gate pulse. The static response test shows that the image intensity of the CsI microstrip photocathode is 3.4 times that of the Au microstrip photocathode when illuminated by a non-monochromatic portable X-ray source with high energy photons. The sealed imager not only enhances the sensitivity and stability of the framing camera, but also has the potential to reduce crosstalks and artifacts, thus further improves the precision of measurement in practice.<br/></div> © 2021

Number of references:24

Main heading:X ray detectors

Controlled terms:Field emission cathodes - Cesium iodide - Cameras - Photocathodes - Microchannels - Gold - Image enhancement - Image storage tubes

Uncontrolled terms:CsI photocathodes - Exposure-time - Framing Camera - Fusion diagnosis - Hermetically sealed - Micro channel plate - Micro-channel plate - Micro-strips - Ultra-fast diagnostic - X-ray detector

Classification code:547.1 Precious Metals - 714.1 Electron Tubes - 741.3 Optical Devices and Systems - 742.2 Photographic Equipment - 804 Chemical Products Generally

Numerical data indexing:Size 1.00E-07m, Time 2.00E-10s, Time 6.50E-11s

DOI:10.1016/j.nima.2021.165404

Funding details: Number: 6140721010203, Acronym: -, Sponsor: -;Number: XAB2016B25, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: -, Acronym: -, Sponsor: West Light Foundation of the Chinese Academy of Sciences;

Funding text:This research was funded by the Equipment Pre-research Field Fund, China (Grant No. 6140721010203 ) and by the West Light Foundation of the Chinese Academy of Sciences (Grant No. XAB2016B25 ).

Database:Compendex

Accession number:20212310447556

Title:Genetic-algorithm-based deep neural networks for highly efficient photonic device design

Authors:Ren, Yangming (1, 2); Zhang, Linxuan (1, 2); Wang, Weiqiang (1, 2); Wang, Xinyu (1, 2); Lei, Yufang (1, 2); Xue, Yulong (1, 2); Sun, Xiaochen (1, 2); Zhang, Wenfu (1, 2)

Corresponding authors:Sun, Xiaochen(sunxiaochen@opt.ac.cn); Zhang, Wenfu(wfuzhang@opt.ac.cn)

Source title:Photonics Research

Abbreviated source title:Photon. Res.

Volume:9

Issue:6

Issue date:June 1, 2021

Publication year:2021

Pages:B247-B252

Language:English

ISSN:23279125

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">While deep learning has demonstrated tremendous potential for photonic device design, it often demands a large amount of labeled data to train these deep neural network models. Preparing these data requires high-resolution numerical simulations or experimental measurements and cost significant, if not prohibitive, time and resources. In this work, we present a highly efficient inverse design method that combines deep neural networks with a genetic algorithm to optimize the geometry of photonic devices in the polar coordinate system. The method requires significantly less training data compared with previous inverse design methods. We implement this method to design several ultra-compact silicon photonics devices with challenging properties including power splitters with uncommon splitting ratios, a TE mode converter, and a broadband power splitter. These devices are free of the features beyond the capability of photolithography and generally in compliance with silicon photonics fabrication design rules.<br/></div> © 2021 Chinese Laser Press

Number of references:34

Main heading:Deep neural networks

Controlled terms:Design - Inverse problems - Silicon photonics - Genetic algorithms - Photonic devices

Uncontrolled terms:Fabrication designs - High-resolution numerical simulation - Inverse design methods - Large amounts - Neural network model - Polar coordinate systems - Power splitters - Splitting ratio

Classification code:461.4 Ergonomics and Human Factors Engineering - 741.1 Light/Optics - 741.3 Optical Devices and Systems

DOI:10.1364/PRJ.416294

Funding details: Number: 201903, Acronym: -, Sponsor: -;Number: 12004421,61635013,61675231, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: XDB24030600, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2016535, Acronym: -, Sponsor: Youth Innovation Promotion Association of the Chinese Academy of Sciences;Number: XAB2017A09, Acronym: -, Sponsor: West Light Foundation of the Chinese Academy of Sciences;Number: 2019JQ-447, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;

Funding text:Strategic Priority Research Program of the Chinese Academy of Sciences (XDB24030600); National Natural Science Foundation of China (12004421, 61635013, 61675231); Youth Innovation Promotion Association of Chinese Academy of Sciences (2016535); West Light Foundation of the Chinese Academy of Sciences (XAB2017A09); Natural Science Basic Research Program of Shaanxi (2019JQ-447); Research Project of Xi'an Postdoctoral Innovation Base (201903).Funding. Strategic Priority Research Program of the Chinese Academy of Sciences (XDB24030600); National Natural Science Foundation of China (12004421, 61635013, 61675231); Youth Innovation Promotion Association of Chinese Academy of Sciences (2016535); West Light Foundation of the Chinese Academy of Sciences (XAB2017A09); Natural Science Basic Research Program of Shaanxi (2019JQ-447); Research Project Postdoctoral Innovation Base (201903).

Database:Compendex

Accession number:20214911279038

Title:A visible light photon-counting imaging detector based on induction readout

Authors:Liu, Yong'An (1, 2); Liu, Yifan (1, 2); Wei, Yonglin (1); Yang, Xianghui (1); Zhang, Ruili (1); Zhao, Hui (1); Tian, Jinshou (1); Sheng, Lizhi (1); Zhao, Baosheng (1)

Corresponding author:Liu, Yong'an(liuya@opt.ac.cn)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11896

Part number:1 of 1

Issue title:Advanced Optical Imaging Technologies IV

Issue date:2021

Publication year:2021

Article number:1189618

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510646414

Document type:Conference article (CA)

Conference name:Advanced Optical Imaging Technologies IV 2021

Conference date:October 10, 2021 - October 11, 2021

Conference location:Nantong, China

Conference code:174445

Sponsor:Chinese Optical Society (COS); The Society of Photo-Optical Instrumentation Engineers (SPIE)

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">Photon-counting imaging detectors based on microchannel plate (MCP) and position-sensitive anode are characterized by extremely high sensitivity, as well as the ability to detect single photons. In this study, a visible light photon-counting imaging detector based on induction readout was developed for the detection of weak light intensities, such as photon counting radar and biofluorescence lifetime imaging. The design is based on a 25 mm diameter multi-alkali S20 photocathode followed by a MCP stack, and read out by a high-resistance Ge layer anode. The position-sensitive anode was located at the atmosphere side of the Ge substrate. Such a detector was advantageous in terms of reconfigurability and detachability. The imaging performance of the detector was tested by using the wedge and strip anode to decode the photon event position information. The experimental results showed a detector gain reaching about 3×106, pulse height resolution (PHR) of about 105%, and spatial resolution better than 100μm.<br/></div> © 2021 SPIE.

Number of references:16

Main heading:Anodes

Controlled terms:Image resolution - Light - Germanium - Photons

Uncontrolled terms:High sensitivity - Imaging detector - Induction readout - Light photon - Micro channel plate - Photon-counting imaging - Position-sensitive anodes - Single photons - Spatial resolution - Visible light

Classification code:549.3 Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals - 714.1 Electron Tubes - 741.1 Light/Optics - 931.3 Atomic and Molecular Physics

Numerical data indexing:Percentage 1.05E+02%, Size 1.00E-04m, Size 2.50E-02m

DOI:10.1117/12.2602541

Funding details: Number: XAB2018A07, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2018438, Acronym: YIPA, Sponsor: Youth Innovation Promotion Association;Number: 2021JM-214, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;

Funding text:This work was supported by the Chinese Academy of Sciences "Light of West China" Program (No. XAB2018A07),This work was supported by the Chinese Academy of Sciences "Light of West China" Program (No. XAB2018A07), the Youth Innovation Promotion Association, Chinese Academy of Sciences (No. 2018438) and Natural Science Basic Research Program of Shaanxi (No. 2021JM-214).

Database:Compendex

Accession number:20205009610622

Title:High-performance solid-state photon-enhanced thermionic emission solar energy converters with graded bandgap window-layer

Authors:Yang, Yang (1, 4); Xu, Peng (1, 2); Cao, Weiwei (1, 2, 3); Zhu, Bingli (1, 5); Wang, Bo (1); Bai, Yonglin (1, 4); Qin, Junjun (2, 5); Bai, Xiaohong (4); Chen, Zhen (1)

Author affiliation:(1) Key Laboratory of Ultrafast Photoelectric Diagnostic Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100091, China; (3) Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Shaanxi Key Laboratory of Information Photonic Technique, Xi'an Jiaotong University, Xi'an; 710049, China; (4) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (5) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China

Corresponding author:Yang, Yang(yangyang@opt.cn)

Source title:Journal of Physics D: Applied Physics

Abbreviated source title:J Phys D

Volume:54

Issue:5

Issue date:February 4, 2021

Publication year:2021

Article number:055502

Language:English

ISSN:00223727

E-ISSN:13616463

CODEN:JPAPBE

Document type:Journal article (JA)

Publisher:IOP Publishing Ltd

Abstract:To realize a high-performance solid-state photon-enhanced thermionic emission (SPETE) solar energy converter, in this study, a graded bandgap window layer is therefore adopted, throughout which the bandgap gradation is generated via the variation of Al composition in the layer in the SPETE converter with a GaAs absorber. Based on one-dimension steady-state equation, an analytical model is formed in analyzing performance of the proposed device in our study. Theoretical simulation results indicate that not only are the losses of contact surface recombination being decreased via the bandgap-gradation-induced build-in electric field of the window layer, but also the photon-generated electrons are effectively collected, thereby improving the conversion efficiency. Moreover, the effect of bandgap energy of the contact surface and the width of the window layer on device performance is discussed. A trade-off of high-efficient SPETE converters is therefore realized between large contact surface bandgap and thin window layer width, to which the rationale lies in the improved process of electron collection facilitated by the enhanced build-in electric field rather than reducing the photon absorption in the window layer. Threshold values for barrier height at the emitting interface are presented to guarantee the ideal voltage-current characteristic. It is found that the threshold values of barrier increase with the increase in temperatures.<br/> © 2020 IOP Publishing Ltd.

Number of references:29

Main heading:Energy gap

Controlled terms:Gallium arsenide - Solar energy - III-V semiconductors - Thermionic emission - Electric fields - Equations of state - Solid state devices - Photons - Aluminum gallium arsenide - Economic and social effects

Uncontrolled terms:Device performance - Electron collections - Energy converters - Improved process - Photon absorptions - Steady state equation - Theoretical simulation - Voltage-current characteristics

Classification code:657.1 Solar Energy and Phenomena - 701.1 Electricity: Basic Concepts and Phenomena - 712.1 Semiconducting Materials - 712.1.2 Compound Semiconducting Materials - 714.2 Semiconductor Devices and Integrated Circuits - 804 Chemical Products Generally - 931.3 Atomic and Molecular Physics - 971 Social Sciences

DOI:10.1088/1361-6463/abbb04

Database:Compendex

Accession number:20212310453809

Title:All-optical tunable fiber filter based on a few-mode optical fiber mode interferometer coated with graphene epoxy resin composite material

Authors:Chen, Enqing (1, 2); Dong, Bo (3); Li, Yang (1, 2); Li, Ziwan (1, 2); Wang, Xiaoli (1, 2); Zhao, Yudi (1); Xu, Wei (1, 2); Zhao, Wei (1, 2, 4); Wang, Yishan (1, 2)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, CAS, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) College of new materials and new energy, Shenzhen Technology University, Shenzhen; 518118, China; (4) Collaborative Innovation Center of Extreme Optics Shanxi University, Taiyuan; 030006, China

Corresponding author:Dong, Bo(dongbo@sztu.edu.cn)

Source title:Optics Communications

Abbreviated source title:Opt Commun

Volume:497

Issue date:October 15, 2021

Publication year:2021

Article number:127140

Language:English

ISSN:00304018

CODEN:OPCOB8

Document type:Journal article (JA)

Publisher:Elsevier B.V.

Abstract:<div data-language="eng" data-ev-field="abstract">A compact all-optical tunable fiber filter based on a few-mode optical fiber modal interferometer coated with graphene epoxy resin composite material is proposed and experimentally demonstrated. The interferometer is constructed with a 2-cm FMF connected to two single mode fibers. After coating the graphene epoxy resin composite material on the outside of the interferometer, it shows the all-optical wavelength tunability, and experimental results show that the wavelength shift changes quasilinearly with the pump power changing. The wavelength tunable range reaches 5.062 nm with a step of 0.016 nm/mw. It is expected to have practical application in optical communication, fiber sensing, fiber laser and optical spectrum analysis.<br/></div> © 2021 Elsevier B.V.

Number of references:18

Main heading:Graphene

Controlled terms:Composite materials - Epoxy resins - Interferometers - Optical fiber communication - Spectrum analysis - Fiber lasers - Single mode fibers

Uncontrolled terms:All optical - Composites material - Epoxy resin composites - Few-mode optical fiber - Fiber mode - Filter-based - Modal interferometers - Optical- - Tunable fiber filter - Tunable modal interferometer filter

Classification code:717.1 Optical Communication Systems - 741.1.2 Fiber Optics - 744.4 Solid State Lasers - 761 Nanotechnology - 804 Chemical Products Generally - 815.1.1 Organic Polymers - 941.3 Optical Instruments - 951 Materials Science

Numerical data indexing:Size 1.60E-11m, Size 2.00E-02m, Size 5.062E-09m

DOI:10.1016/j.optcom.2021.127140

Funding details: Number: Y829321213, Acronym: CAS, Sponsor: Chinese Academy of Sciences;

Funding text:This work is supported by the CAS Pioneer Hundred Talents Program, China Y829321213 .

Database:Compendex

Accession number:20215011321997

Title:Theoretical and Technical Research of X-ray Communication in Plasma Sheath

Title of translation:等离子体鞘套中X射线通信传输理论与实验研究

Authors:Su, Tong (1); Sheng, Lizhi (1); Liu, Yongan (1, 2); Zhang, Xuehan (1, 2); Liu, Yifan (1, 2); Zhao, Baosheng (1)

Corresponding author:Sheng, Lizhi(lizhi_sheng@opt.ac.cn)

Source title:Guangzi Xuebao/Acta Photonica Sinica

Abbreviated source title:Guangzi Xuebao

Volume:50

Issue:11

Issue date:November 25, 2021

Publication year:2021

Article number:1134001

Language:Chinese

ISSN:10044213

CODEN:GUXUED

Document type:Journal article (JA)

Publisher:Chinese Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">Because of the imperfect theoretical model and insufficient experimental verification technologies, the problem of information transmission in the plasma sheath has not yet been resolved. In this paper, the interaction mechanism between X-ray photons and plasma is studied firstly, and a modified theoretical model is provided through numerical calculation and theoretical modeling. Different from the conclusion that X-rays can penetrate plasma without attenuation in the traditional wave model, the modified theoretical model established in this paper points out that the transmittance of X-rays in plasma is closely related to plasma electron density and incident X-ray flux. Secondly, an experimental system was built using a grid-controlled X-ray modulation emission source, a single-photon X-ray detector, and a dynamic plasma generator. Using this system, the non-uniform plasma which electron density ranges from 10<sup>9</sup>/cm<sup>3</sup> to 10<sup>14</sup>/cm<sup>3</sup> is generated, and the X-ray communication with 1 Mbps communication rante and 10<sup>-5</sup> bit error rate is also verified. The experimental results indicate that the modified theoretical model can explain and predict the experimental phenomena, and the experimental system can provide the solution for solving the communication problems in the plasma sheath.<br/></div> © 2021, Science Press. All right reserved.

Number of references:21

Main heading:Photons

Controlled terms:Electron density measurement - Particle beams - Carrier concentration - Transmissions - Plasma sheaths - Bit error rate - Plasma diagnostics - X ray detectors

Uncontrolled terms:Experimental system - Experimental verification - Plasma generation - Single photon detection - Technical research - Theoretical modeling - Theoretical research - Transmission link - Transmission link equation - X-ray communication

Classification code:602.2 Mechanical Transmissions - 701.1 Electricity: Basic Concepts and Phenomena - 723.1 Computer Programming - 931.3 Atomic and Molecular Physics - 932.1 High Energy Physics - 932.3 Plasma Physics

Numerical data indexing:Bit rate 1.00E+06bit/s

DOI:10.3788/gzxb20215011.1134001

Funding text:National Natural Science Foundation of China (No.61901470), Key Research and Development Program of Shaanxi Province (No. 2020GY-032)

Database:Compendex

Accession number:20210109710602

Title:Secondary electron emission characteristics of the Al<inf>2</inf>O<inf>3</inf>/MgO double-layer structure prepared by atomic layer deposition

Authors:Cao, Weiwei (1, 2, 3); Wang, Bo (1); Yang, Yang (1); Zhu, Bingli (1, 5); Guo, Junjiang (3, 4, 5); Xu, Peng (1, 3, 6); Bai, Xiaohong (1, 6); Qin, Junjun (1, 5); Wang, Chao (1, 5); Zhu, Jingping (2); Bai, Yonglin (1, 5)

Author affiliation:(1) Key Laboratory of Ultrafast Photoelectric Diagnostic Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) Key Laboratory for Physical Electronics and Devices of the Ministry of Education and Shaanxi Key Lab of Information Photonic Technique, Xi'an Jiaotong University, Xi'an; 710049, China; (3) University of Chinese Academy of Sciences, Beijing; 100091, China; (4) Key Laboratory for Physical Electronics and Devices of the Ministry of Education & Shaanxi Key Lab of Information Photonic Technique, School of Electronics & Information Engineering, Xi'an Jiaotong University, Xi'an; 710049, China; (5) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (6) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; Shanxi; 030006, China

Corresponding author:Bai, Yonglin(baiyonglin@opt.ac.cn)

Source title:Ceramics International

Abbreviated source title:Ceram Int

Volume:47

Issue:7

Issue date:April 1, 2021

Publication year:2021

Pages:9866-9872

Language:English

ISSN:02728842

CODEN:CINNDH

Document type:Journal article (JA)

Publisher:Elsevier Ltd

Abstract:As a secondary electron emission layer, an Al<inf>2</inf>O<inf>3</inf>/MgO double-layer structure is fabricated by atomic layer deposition (ALD) technology. The thickness range from 1 nm to 4 nm of the top Al<inf>2</inf>O<inf>3</inf> layer deposited on 20 nm MgO creates a double-layer. The morphology of the cross section, element distribution, surface roughness, X-ray diffraction, and secondary electron yield (SEY) values were measured by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), atomic force microscopy (AFM) and secondary electron emission (SEE) measurement systems. The SEE characteristics of the MgO single layer, Al<inf>2</inf>O<inf>3</inf> single layer and MgO/Al<inf>2</inf>O<inf>3</inf> double-layer were measured. The maximum SEY of a single MgO layer reached 6.2@600 eV, and the maximum SEY of a single Al<inf>2</inf>O<inf>3</inf> layer reached 3.92@400 eV. The SEY of the Al<inf>2</inf>O<inf>3</inf>/MgO double-layer decreased when the Al<inf>2</inf>O<inf>3</inf> thickness ranged from 1 nm to 4 nm, and the SEY reduction value of the double-layer decreased as the Al<inf>2</inf>O<inf>3</inf> thickness increased. Finally, Dionne's semiempirical SEE model was employed to explain the SEE yield of the prepared composite film structures. These results are useful for depositing a secondary electron emission layer in the channel of microchannel plates.<br/> © 2020

Number of references:29

Main heading:Atomic layer deposition

Controlled terms:Scanning electron microscopy - Energy dispersive spectroscopy - Alumina - Aluminum oxide - Magnesia - Plates (structural components) - Composite films - Film preparation - Surface morphology - Morphology - Secondary emission - Electrons - Microchannels - Surface roughness

Uncontrolled terms:Double layer structure - Element distribution - Energy dispersive spectroscopies (EDS) - Measurement system - Micro channel plate - Reduction values - Secondary electron emissions - Secondary electron yield

Classification code:408.2 Structural Members and Shapes - 804.2 Inorganic Compounds - 813.1 Coating Techniques - 931.2 Physical Properties of Gases, Liquids and Solids - 933.1.2 Crystal Growth - 951 Materials Science

Numerical data indexing:Size 1.00e-09m to 4.00e-09m, Size 2.00e-08m

DOI:10.1016/j.ceramint.2020.12.128

Funding details: Number: 6140721010203, Acronym: -, Sponsor: -;Number: 11675258,11803074,61904202, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: XDA17010203, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2018JM6059, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;

Funding text:This work was financially supported by the National Natural Science Foundation of China (Grant No. 61904202, Grant No. 11803074, Grant No. 11675258), Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDA17010203), the Shaanxi Natural Science Basic Research Project (Grant No. 2018JM6059) and the Equipment Pre-research Field Fund (Grant No. 6140721010203).This work was financially supported by the National Natural Science Foundation of China (Grant No. 61904202 , Grant No. 11803074 , Grant No. 11675258 ), Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDA17010203 ), the Shaanxi Natural Science Basic Research Project (Grant No. 2018JM6059 ) and the Equipment Pre-research Field Fund (Grant No. 6140721010203 ).

Database:Compendex

Accession number:20212610567802

Title:Dark matter-wave gap solitons of Bose-Einstein condensates trapped in optical lattices with competing cubic-quintic nonlinearities

Authors:Chen, Junbo (1, 2); Zeng, Jianhua (1, 2)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Zeng, Jianhua(zengjh@opt.ac.cn)

Source title:Chaos, Solitons and Fractals

Abbreviated source title:Chaos Solitons Fractals

Volume:150

Issue date:September 2021

Publication year:2021

Article number:111149

Language:English

ISSN:09600779

CODEN:CSFOEH

Document type:Journal article (JA)

Publisher:Elsevier Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">Solitons are nonlinear self-sustained wave excitations and probably among the most interesting and exciting emergent nonlinear phenomenon in the corresponding theoretical settings. Bright solitons with sharp peak and dark solitons with central notch have been well known and observed in various nonlinear systems. The interplay of periodic potentials, like photonic crystals and lattices in optics and optical lattices in ultracold atoms, with the dispersion has brought about gap solitons within the finite band gaps of the underlying linear Bloch-wave spectrum and, particularly, the bright gap solitons have been experimentally observed in these nonlinear periodic systems, while little is known about the underlying physics of dark gap solitons. Here, we theoretically and numerically investigate the existence, property and stability of one-dimensional matter-wave gap solitons and soliton clusters of Bose-Einstein condensates trapped in optical lattices with competing cubic-quintic nonlinearity, the higher-order of which is self-defocusing and the lower-order (cubic) one is chosen as self-defocusing or focusing nonlinearities. By means of the conventional linear-stability analysis and direct numerical calculations with initial perturbations, we identify the stability and instability areas of the corresponding dark gap solitons and clusters ones.<br/></div> © 2021 Elsevier Ltd

Number of references:78

Main heading:Optical lattices

Controlled terms:Nonlinear optics - Statistical mechanics - Control nonlinearities - Optical materials - Solitons - Crystal lattices - Energy gap - Bose-Einstein condensation - Linear stability analysis - Nonlinear equations

Uncontrolled terms:Bose-Einstein condensates - Cubic-quintic nonlinearity - Dark gap soliton - Dark matter - Gap soliton - Matter waves - Nonlinear schrödinge equation - Optical- - Self-defocusing - Wave excitation

Classification code:731.1 Control Systems - 741.1.1 Nonlinear Optics - 741.3 Optical Devices and Systems - 744.8 Laser Beam Interactions - 921 Mathematics - 922.2 Mathematical Statistics - 931.1 Mechanics - 931.2 Physical Properties of Gases, Liquids and Solids - 931.3 Atomic and Molecular Physics - 933.1.1 Crystal Lattice

DOI:10.1016/j.chaos.2021.111149

Funding details: Number: 12074423,61690222,61690224, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:National Natural Science Foundation of China (NSFC) (Nos. 61690224 , 61690222 , 12074423 ).

Database:Compendex

Accession number:20214611156350

Title:Axial resolution enhancement for planar Airy beam light-sheet microscopy via the complementary beam subtraction method

Authors:Liu, Chao (1, 2); Yu, Xianghua (1); Bai, Chen (1); Li, Xing (1, 2); Zhou, Yuan (1, 2); Yan, Shaohui (1); Min, Junwei (1); Dan, Dan (1); Li, Runze (1); Gu, Shuangyu (1, 2); Yao, Baoli (1, 2)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Shaanxi, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Source title:Applied Optics

Abbreviated source title:Appl. Opt.

Volume:60

Issue:32

Issue date:November 10, 2021

Publication year:2021

Pages:10239-10245

Language:English

ISSN:1559128X

E-ISSN:21553165

CODEN:APOPAI

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">Airy beam light-sheet illumination can extend the field of view (FOV) of light-sheet fluorescence microscopy due to the unique propagation properties of non-diffraction and self-acceleration.However, the side lobes create undesirable out-of-focus background, leading to poor axial resolution and low image contrast. Here, we propose an Airy complementary beam subtraction (ACBS) method to improve the axial resolution while keeping the extended FOV. By scanning the optimized designed complementary beam that has two main lobes (TML), the generated complementary light-sheet has almost identical intensity distribution to that of the planar Airy light-sheet except for the central lobe. Subtraction of the two images acquired by double exposure respectively using the planar Airy light-sheet and the planar TML light-sheet can effectively suppress the influence of the out-of-focus background. The axial resolution improves from &sim;4 μm to 1.2 μm. The imaging performance was demonstrated by imaging specimens of aspergillus conidiophores and GFP labeled mouse brain section. The results show that the ACBS method enables the Airy beam light-sheet fluorescence microscopy to obtain better imaging quality.<br/></div> © 2021 Optical Society of America.

Number of references:33

Main heading:Fluorescence microscopy

Controlled terms:Fluorescence

Uncontrolled terms:Airy beams - Axial resolutions - Field of views - Light sheet - Light-sheet microscopies - Main lobes - Out-of-focus - Propagation properties - Resolution enhancement - Subtraction method

Classification code:741.1 Light/Optics - 931.4 Quantum Theory; Quantum Mechanics - 941.3 Optical Instruments

Numerical data indexing:Size 4.00E-06m to 1.20E-06m

DOI:10.1364/AO.441070

Funding details: Number: 11704405,61905277,61975233, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2020GY-008,2020SF-193, Acronym: -, Sponsor: Shanxi Provincial Key Research and Development Project;

Funding text:Funding. National Natural Science Foundation of China (11704405, 61905277, 61975233); Key Research and Development Program of Shaanxi Province (2020GY-008, 2020SF-193).

Database:Compendex

Accession number:20212010360135

Title:Development Current Status and Trend Analysis of Satellite Laser Communication(Invited)

Title of translation:卫星激光通信发展现状与趋势分析(特邀)

Authors:Gao, Duorui (1, 2, 3); Xie, Zhuang (1, 2, 3); Ma, Rong (1, 2, 3); Wang, Wei (1, 2); Bai, Zhaofeng (1, 2); Jia, Shuaiwei (1, 2, 3); Shao, Wen (1, 2, 3); Xie, Xiaoping (1, 2, 3)

Author affiliation:(1) Laboratory of Photonics and Network, Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding authors:Wang, Wei(wangwei2012@opt.ac.cn); Xie, Xiaoping(xxp@opt.ac.cn)

Source title:Guangzi Xuebao/Acta Photonica Sinica

Abbreviated source title:Guangzi Xuebao

Volume:50

Issue:4

Issue date:April 25, 2021

Publication year:2021

Article number:0406001

Language:Chinese

ISSN:10044213

CODEN:GUXUED

Document type:Journal article (JA)

Publisher:Chinese Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">Satellite laser communication, with its wide bandwidth and no electromagnetic spectrum constraints, has become an effective means to solve the bandwidth bottleneck of satellite microwave communication, alleviate the shortage of satellite spectrum resources and realize high-speed satellite communication. This paper introduces the system composition and characteristics of satellite laser communication, and analyzes the development context, latest progress and future development plans of satellite laser communication technology at international and domestic. Combined with the requirements of future space network and deep-space exploration, this paper summarizes from five aspects of high-speed, deep-space, integration, networking and all-optical, and discusses the key technologies involved in the future, which can provide reference for the research of satellite laser communication technology in China.<br/></div> © 2021, Science Press. All right reserved.

Number of references:99

Main heading:Satellites

Controlled terms:Interplanetary flight - Bandwidth - Optical communication - Space research - Satellite communication systems

Uncontrolled terms:Bandwidth bottlenecks - Deep-space exploration - Development plans - Electromagnetic spectra - Microwave communications - Satellite communications - Satellite laser communication - System composition

Classification code:655.2 Satellites - 655.2.1 Communication Satellites - 656.1 Space Flight - 656.2 Space Research - 716.1 Information Theory and Signal Processing - 717.1 Optical Communication Systems

DOI:10.3788/gzxb20215004.0406001

Funding details: Number: 61231012,91638101, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:item：National Natural Science Foundation of China（Nos.61231012，91638101）

Database:Compendex

Accession number:20205109635226

Title:Super-resolution and optical sectioning integrated structured illumination microscopy

Authors:Dan, Dan (1); Gao, Peng (2); Zhao, Tianyu (1, 3); Dang, Shipei (1, 3); Qian, Jia (1, 3); Lei, Ming (1); Min, Junwei (1); Yu, Xianghua (1); Yao, Baoli (1, 3)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) School of Physics and Optoelectronic Engineering, Xidian University, Xi'an; 710071, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China

Source title:Journal of Physics D: Applied Physics

Abbreviated source title:J Phys D

Volume:54

Issue:7

Issue date:February 4, 2021

Publication year:2021

Article number:074004

Language:English

ISSN:00223727

E-ISSN:13616463

CODEN:JPAPBE

Document type:Journal article (JA)

Publisher:IOP Publishing Ltd

Abstract:Super-resolution structured illumination microscopy (SR-SIM) has attracted a great deal of attention in the past few decades. As a wide-field imaging technique, SR-SIM usually suffers from issues relating to out-of-focus background, particularly when imaging thick samples. In this study, we develop an integrated SIM with simultaneous SR and optical sectioning (OS) capabilities, facilitating SR imaging of stacked optical sections, with the out-of-focus background suppressed. The combination of the merits of SR and OS is realized by means of a new image reconstruction algorithm. We confirm the validity of the integrated SIM, both experimentally and in simulation. We anticipate that this integrated SIM will assist biologists in obtaining much clearer SR images in relation to thick specimens.<br/> © 2020 IOP Publishing Ltd.

Number of references:30

Main heading:Optical resolving power

Controlled terms:Image reconstruction

Uncontrolled terms:Image reconstruction algorithm - Optical sectioning - Optical sections - Out-of-focus - Structured illumination microscopy - Super resolution - Thick samples - Wide field imaging

Classification code:741.1 Light/Optics

DOI:10.1088/1361-6463/abc4a8

Database:Compendex

Accession number:20213810925184

Title:Dependence of field splitting characteristics on metallic components topological configuration in multilaminar plasmonic films

Authors:Kang, Yifan (1, 2, 3); Yang, Hongtao (1); Wang, Chao (4); Li, Yongfeng (5); Cao, Weiwei (1)

Author affiliation:(1) The Xi'an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi'an; 710119, China; (2) The University of Chinese Academy of Sciences, Beijing; 100049, China; (3) The Air Force Engineering University, Xi'an; 710051, China; (4) The Center for Attosecond Science and Technology, State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi'an; 710119, China; (5) The Xi'an University of Posts & Telecommunications, Xi'an; 710121, China

Corresponding author:Wang, Chao(igodwang@163.com)

Source title:IEEE Transactions on Nanotechnology

Abbreviated source title:IEEE Trans. Nanotechnol.

Volume:20

Issue date:2021

Publication year:2021

Pages:715-725

Language:English

ISSN:1536125X

E-ISSN:19410085

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">The dependence of field splitting characteristics of multilaminar plasmonic structure on its metallic components topology is analyzed. It is found that the coupling interaction between metallic-particle-centered localized surface plasmons generates a collective effect, collective metallic-particles-centered plasmons, to dominantly determine the plasmonic resonances of the structure. When the metallic particles filling ratio within the matrix is high, this collective effect may cause resonance splitting phenomenon and greatly enlarge the frequency range of field splitting enhancement, which is the physical mechanism and also the designing guideline for multilaminar plasmonic broadband perfect absorber. The surface plasmon polaritons are concurrently superimposed on the metallic-particles-centered collective effect to establish an inter-group coupling competition effect, which may strengthen or weaken the preexisting resonance processes through constructive or destructive field interference in between. This serves as the theoretical base for narrowband field splitting enhancement applications. Moreover, we have revealed the existence of the corresponding relationship between the specific field splitting resonance and those participating or dominating metallic particles involved, which provides the advantages to finely tailor field splitting characteristics through precise implantation of nanoparticles.<br/></div> © 2021 IEEE.

Number of references:36

Main heading:Magnetic resonance

Controlled terms:Electromagnetic wave polarization - Metals - Topology - Surface plasmons - Plasmonics

Uncontrolled terms:Competition effects - Coupling interaction - Localized surface plasmon - Metallic component - Physical mechanism - Plasmonic resonances - Surface plasmon polaritons - Topological configuration

Classification code:701.2 Magnetism: Basic Concepts and Phenomena - 711 Electromagnetic Waves - 921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory - 932.3 Plasma Physics

DOI:10.1109/TNANO.2021.3112704

Funding details: Number: 11675258, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:This work was supported by the National Natural Science Foundation of China (NSFC) under Grant 11675258.

Database:Compendex

Accession number:20211310138894

Title:Prediction of milling forces in high-speed milling optical grade SiCp/Al composites

Title of translation:高速铣削光学级SiCp/Al复合材料的铣削力预测

Authors:Guo, Lin (1); Huang, Shu-Tao (1); Yang, Hai-Cheng (2); Xu, Li-Fu (3); Zhang, Yu-Pu (3)

Author affiliation:(1) Shenyang Ligong University, Shenyang; 110159, China; (2) Xian Institute of Applied Optics and Precision Mechanics of CAS, Xi'an; 710068, China; (3) Shenyang Ligong University, School of Mechanical Engineering, Shenyang; 110159, China

Corresponding authors:Huang, Shu-Tao(syithst@sylu.edu.cn); Yang, Hai-Cheng(yyhhcc62@163.com)

Source title:Guangxue Jingmi Gongcheng/Optics and Precision Engineering

Abbreviated source title:Guangxue Jingmi Gongcheng

Volume:29

Issue:1

Issue date:January 2021

Publication year:2021

Pages:117-129

Language:Chinese

ISSN:1004924X

CODEN:GJGOF4

Document type:Journal article (JA)

Publisher:Chinese Academy of Sciences

Abstract:Under the conditions of down and up milling, to compare the variation characteristics of milling forces of a polycrystalline-diamond single-tooth end mill with a diamond grain size of 32 μm when milling optical-grade SiCp/Al composites at high speed, the effects of the milling method and milling amounts on milling forces characteristics were studied. The empirical formulae of milling forces were also established based on a multiple linear regression analysis method. An L9(3<sup>4</sup>) orthogonal cutting experiment was conducted to study the influence of milling amounts on the cutting force under the two conditions. A rotary dynamometer was then used to collect the signals of each milling force, and an empirical formula of tangential force F<inf>t</inf>, radial force F<inf>r</inf>, axial force F<inf>z</inf>, and total milling force F<inf>total</inf> was then established using the multiple linear regression analysis method. Experimental results demonstrated that the milling force calculated using the established regression formula was significantly high, and the average error of the model was within 10%. Under the two milling conditions, the highest level of influence on each milling force was the axial cutting depth, followed by the feed per tooth and cutting speed. To obtain smaller cutting forces, a smaller axial cutting depth should first be selected, followed by a smaller feed per tooth and a higher cutting speed.<br/> © 2021, Science Press. All right reserved.

Number of references:28

Main heading:Milling (machining)

Controlled terms:Particle reinforced composites - Particle size analysis - Cutting - Linear regression - Silicon carbide - Aluminum

Uncontrolled terms:High speed milling - Milling conditions - Multiple linear regression analysis - Orthogonal cutting - Polycrystalline diamonds - Regression formulas - SiCp/Al composites - Variation characteristics

Classification code:541.1 Aluminum - 604.2 Machining Operations - 804.2 Inorganic Compounds - 922.2 Mathematical Statistics - 951 Materials Science

Numerical data indexing:Percentage 1.00e+01%, Size 3.20e-05m

DOI:10.37188/OPE.20212901.0117

Database:Compendex

Accession number:20213810900937

Title:Collective multipartite Einstein-Podolsky-Rosen steering via cascaded four-wave mixing of rubidium atoms

Authors:Liu, Yang (1, 2, 3); Cai, Yin (1); Luo, Binshuo (1); Yan, Jin (1); Niu, Mengqi (1); Li, Feng (1); Zhang, Yanpeng (1)

Author affiliation:(1) Key Laboratory for Physical Electronics and Devices, Ministry of Education, Shaanxi Key Lab of Information Photonic Technique, Xi'An Jiaotong University, Xi'an; 710049, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Cai, Yin(caiyin@xjtu.edu.cn)

Source title:Physical Review A

Abbreviated source title:Phys. Rev. A

Volume:104

Issue:3

Issue date:September 2021

Publication year:2021

Article number:033704

Language:English

ISSN:24699926

E-ISSN:24699934

Document type:Journal article (JA)

Publisher:American Physical Society

Abstract:<div data-language="eng" data-ev-field="abstract">Collective multipartite Einstein-Podolsky-Rosen (EPR) steering is a type of quantum correlation shared among n parties, where the EPR paradox of one party can be realized only by performing local measurements on all the remaining n-1 parties. Here, we propose an efficient method to produce collective multipartite EPR steering via symmetrically and asymmetrically cascading parametric amplification processes, i.e., four-wave mixing (FWM) of rubidium atoms. The simplified collective-steering criterion is introduced using the Coffman-Kundu-Wootters monogamy relation. Moreover, by actively adjusting the parametric gains, the collective EPR steerability is optimized in our schemes. We find that the scale of collective steering can be extended by cascading more FWMs; in particular, introducing optical loss is useful for generating collective steering with more parties only in the asymmetry structure. Our results pave the way for the construction of quantum networks and provide a promising candidate for one-sided device-independent quantum cryptography among multiple users.<br/></div> © 2021 American Physical Society.

Number of references:64

Main heading:Four wave mixing

Controlled terms:Rubidium

Uncontrolled terms:Cascaded four-wave mixing - Einstein-Podolsky-rosen - Local measurement - Parametric amplification - Parametric gain - Quantum correlations - Quantum network - Rubidium atoms

Classification code:549.1 Alkali Metals

DOI:10.1103/PhysRevA.104.033704

Funding details: Number: 2021TD-56, Acronym: -, Sponsor: -;Number: 11904279,12074303,12174302,61975159, Acronym: NNSFC, Sponsor: National Natural Science Foundation of China;Number: -, Acronym: CSC, Sponsor: China Scholarship Council;Number: BK20180322, Acronym: -, Sponsor: Natural Science Foundation of Jiangsu Province;Number: 2017YFA0303700, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Funding text:The authors gratefully acknowledge Q. He and Y. Xiang for helpful discussions. The authors recognize the National Key R&D Program of China (Grant No. 2017YFA0303700), the National Natural Science Foundation of China (Grants No. 11904279, No. 61975159, No. 12074303, and No. 12174302), the National Science Foundation of Jiangsu Province (Grant No. BK20180322), and the Key Scientific and Technological Innovation Team of Shaanxi Province (Grant No. 2021TD-56). Y.L. also thanks the China Scholarship Council for financial support.

Database:Compendex

Accession number:20213110707042

Title:Design and Modulation Performance of Ultrafast Light-controlled Pulsed X-ray Tube with Photocathode

Title of translation:基于光电阴极的超快X射线源设计及调制性能研究

Authors:Xuan, Hao (1, 2); Liu, Yongan (1); Qiang, Pengfei (1); Su, Tong (1); Yang, Xianghui (1); Sheng, Lizhi (1); Zhao, Baosheng (1)

Source title:Guangzi Xuebao/Acta Photonica Sinica

Abbreviated source title:Guangzi Xuebao

Volume:50

Issue:7

Issue date:July 25, 2021

Publication year:2021

Article number:0725001

Language:Chinese

ISSN:10044213

CODEN:GUXUED

Document type:Journal article (JA)

Publisher:Chinese Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">In order to solve the easy-broken structure, low energy efficiency and heat dissipation of the traditional X-ray tube with filament based on thermionic cathode, a novel light-controlled pulsed X-ray tube device is deostrated in this paper. By matching the parameters of photocathode and light source, S20 cathode with high quantum efficiency and LED with 460 nm wavelength were selected. At the same time, the overall structure design of the X-ray tube is determined by the simulation. Finally, the maximum tube current of 2.37 mA is realized, the electron emission efficiency of photocathode is 0.288 mA/lm, and the output X-ray energy is adjustable from 0 to 25 keV. In addition, based on the characteristics of easy-access to be modulated of the light-controlled pulsed X-ray tube, different frequencies input signal restoration experiment and arbitrary contor X-ray restoration experiment was carried out.<br/></div> © 2021, Science Press. All right reserved.

Number of references:16

Main heading:Energy efficiency

Controlled terms:X ray tubes - Thermionic emission - Photocathodes - Energy dispersive X ray analysis

Uncontrolled terms:Different frequency - Electron emission efficiency - High quantum efficiency - Pulsed X-rays - Signal restoration - Structure design - Tube currents - X-ray energies

Classification code:525.2 Energy Conservation - 714.1 Electron Tubes - 741.3 Optical Devices and Systems - 801 Chemistry - 944.8 Radiation Measurements

Numerical data indexing:Electric_Current 2.37e-03A, Electron_Volt 0.00e+00eV to 2.50e+04eV, Size 4.60e-07m

DOI:10.3788/gzxb20215007.0725001

Funding details: Number: 61901470, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: U1931138, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:National Natural Science Foundation of China (Nos.61901470, U1931138), the Strategic Pioneer Program on Space Science, Chinese Academy of Science ( No.XDA15020501-04), CAS "Light of West China" Program (No.XAB2018A07), the Foundation of State Key Laboratory of China (No.SKLIPR2021)

Database:Compendex

Accession number:20214611148360

Title:Monolithic RGB Micro-Light-Emitting Diodes Fabricated with Quantum Dots Embedded inside Nanoporous GaN

Authors:Song, Jie (1); Kang, Jin-Ho (2); Han, Jung (2)

Corresponding author:Song, Jie(songjie@opt.ac.cn)

Source title:ACS Applied Electronic Materials

Abbreviated source title:ACS Appl. Electron. Mater.

Volume:3

Issue:11

Issue date:November 23, 2021

Publication year:2021

Pages:4877-4881

Language:English

E-ISSN:26376113

Document type:Journal article (JA)

Publisher:American Chemical Society

Abstract:<div data-language="eng" data-ev-field="abstract">We report the use of colloidal quantum dots (QDs) embedded in nanoporous (NP) gallium nitride (GaN) as a color converter to achieve different emission colors and fabricate micro-light-emitting diodes (micro-LEDs). The optical property of NP-GaN has been studied by analyzing the light transmittance propagating in NP-GaN. A strong light scattering effect can be induced by NP-GaN, resulting in a dramatically increased optical transmission path for blue light and high light absorption by QDs loaded inside NP-GaN. A 4 in. color converter has been achieved with a wavelength deviation of 1 nm across the entire wafer. Monolithic red, green, and blue micro-LEDs have been fabricated with a pixel size of around 35 × 35 μm2.<br/></div> ©

Number of references:31

Main heading:Gallium nitride

Controlled terms:III-V semiconductors - Electroluminescence - Semiconductor quantum dots - Organic light emitting diodes (OLED) - Fabrication - Light scattering - Color - Light absorption - Light - Nanocrystals - Light transmission

Uncontrolled terms:Blue light - Colloidal quantum dots - Emission color - Light transmittance - Lightemitting diode - Micro-light-emitting diode - Monolithics - Nano-porous - Scattering effects - Transmission paths

Classification code:701.1 Electricity: Basic Concepts and Phenomena - 712.1 Semiconducting Materials - 714.2 Semiconductor Devices and Integrated Circuits - 741 Light, Optics and Optical Devices - 741.1 Light/Optics - 761 Nanotechnology - 933.1 Crystalline Solids

Numerical data indexing:Area 3.50E-11m2, Size 1.00E-09m, Size 1.016E-01m

DOI:10.1021/acsaelm.1c00700

Funding details:

Funding text:We acknowledge the research support from Xi’an SaiFuLeSi Semiconductor Technology Co., Ltd. We thank Prof. Hao-Chung Kuo of the Taiwan National Chiao Tung University for the inkjet printing of QDs.

Database:Compendex

Accession number:20215211395539

Title:CCD signal acquisition and optimal digital denoise technology

Authors:Li, Wencan (1, 2); Wen, Yan (1, 3); Wang, Dong (1); Yao, Dalei (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) College of Automation, Northwestern Polytechnical University, Xi'an; 710068, China

Corresponding authors:Li, Wencan(liwencan18@mails.ucas.ac.cn); Li, Wencan(liwencan18@mails.ucas.ac.cn)

Source title:High Technology Letters

Abbreviated source title:High Technol Letters

Volume:27

Issue:4

Issue date:December 2021

Publication year:2021

Pages:422-429

Language:English

ISSN:10066748

CODEN:HTLEFC

Document type:Journal article (JA)

Publisher:Inst. of Scientific and Technical Information of China

Abstract:<div data-language="eng" data-ev-field="abstract">To reduce the charge-coupled device(CCD) readout noise and improve the detection ability under low illumination and dim targets, a new low-noise CCD signal processing technology-CCD digital denoise-is gradually being employed in aerospace detection and other fields. In this study, the main readout noise of CCD detectors and its characteristics are analyzed. A CCD digital denoise system and an experimental platform are designed as well as established by using a PCIe data acquisition card. According to the characteristics of readout noise, some digital filters are analyzed and designed based on distributed kernel coefficient, and the optimal kernel coefficients are obtained through iteration. Then, CCD signal and filter model are established, and the optimal filter is designed to apply to the digital denoise system. Finally, according to the image data obtained from the system, the performance of the digital denoise system and digital filtering algorithm is evaluated and compared. At 500kHz and 1MHz CCD readout rates, the denoising performance of the optimal filter designed in the experiment is 16%-32% higher than that of the digital filter with kernel distribution coefficient, and 50%-60% higher than that of the traditional correlated double sampling technology.<br/></div> Copyright © by HIGH TECHNOLOGY LETTERS PRESS.

Number of references:22

Main heading:Charge coupled devices

Controlled terms:Digital filters - Sampling - Iterative methods - Data acquisition

Uncontrolled terms:Charge-coupled device - Correlated double sampling - De-Noise - Digital correlated double sampling - Lower noise - Optimal filter - Performance - Readout noise - Reset noise - Signal acquisitions

Classification code:703.2 Electric Filters - 714.2 Semiconductor Devices and Integrated Circuits - 723.2 Data Processing and Image Processing - 921.6 Numerical Methods

Numerical data indexing:Frequency 1.00E+06Hz, Frequency 5.00E+05Hz, Percentage 1.60E+01% to 3.20E+01%, Percentage 5.00E+01% to 6.00E+01%

DOI:10.3772/j.issn.1006-6748.2021.04.011

Funding details: Number: 6132570201, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Funding text:Supported by the National Program on Key Basic Research Project (973 Program)(No. 6132570201). To whom correspondence should be addressed. E-mail: liwencan18@ mails. ucas. ac. cn Received on Jan. 29, 2021

Database:Compendex

Accession number:20215111331131

Title:Ultrafast photonics applications of zirconium carbide as a novel mode-locker for fiber lasers

Authors:Liu, Sicong (1); Lv, Ruidong (1, 2); Wang, Jiang (1, 3); Wang, Yishan (4); Wang, Hushan (4); Zhang, Han (5); Wang, Yonggang (1)

Author affiliation:(1) School of Physics and Information Technology, Shaanxi Normal University, Xi'an; 710119, China; (2) School of Electronic Science and Engineering, Xi'An Jiaotong University, Xi'an; 710049, China; (3) School of Artificial Intelligence, Optics and ElectroNics, Northwestern Polytechnical University, Xi'an; 710072, China; (4) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (5) College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen; 518060, China

Corresponding author:Wang, Yonggang

Source title:Journal of Materials Chemistry C

Abbreviated source title:J. Mater. Chem. C

Volume:9

Issue:47

Issue date:December 21, 2021

Publication year:2021

Pages:16985-16990

Language:English

ISSN:20507534

E-ISSN:20507526

CODEN:JMCCCX

Document type:Journal article (JA)

Publisher:Royal Society of Chemistry

Abstract:<div data-language="eng" data-ev-field="abstract">Zirconium carbide (ZrC), as a novel member of the MXene family, has outstanding physical and chemical properties; however, the applications of ZrC in ultrafast photonics are still rare. Herein, a ZrC film was deposited by magnetron sputtering deposition (MSD) technology onto a D-shaped fiber and the nonlinear optical properties of the ZrC film were demonstrated. MSD technology is an advanced preparation method applicable to various materials. The saturation intensity and the modulation depth of the ZrC film were measured to be 197.6 MW cm-2 and 11.9%, respectively. After inserting the ZrC SA into an erbium-doped fiber laser (EDFL) cavity, a passive mode-locked EDFL pulse was formed. In mode-locked operation, conventional solitons with an ultrashort pulse duration of 395 fs and an output power of 49.86 mW were achieved in the communication band. The corresponding central wavelength of the output spectrum was 1562.19 nm with a 7.73 nm spectral width. This work pioneers the application of a ZrC-based device as a mode-locker to achieve ultrashort pulses for the first time and expands the application of the ZrC material. The experimental results open new opportunities for the use of ZrC in mode-locked lasers and photonics applications. This journal is<br/></div> © The Royal Society of Chemistry.

Number of references:57

Main heading:Fiber lasers

Controlled terms:Ultrashort pulses - Zirconium compounds - Mode-locked fiber lasers - Optical properties - Nonlinear optics - Passive mode locking - Carbides

Uncontrolled terms:D-shaped fiber - Deposition technology - Erbium-doped fiber lasers - Magnetron-sputtering deposition - Photonic application - Physical and chemical properties - Ultra-fast photonics - Ultrashort-pulse - Zirconium carbide - Zirconium carbide films

Classification code:741.1 Light/Optics - 741.1.1 Nonlinear Optics - 744.1 Lasers, General - 744.4 Solid State Lasers - 804.2 Inorganic Compounds - 812.1 Ceramics

Numerical data indexing:Percentage 1.19E+01%, Percentage 2.00E+00%, Power 1.976E+08W, Power 4.986E-02W, Size 1.56219E-06m, Size 7.73E-09m, Time 3.95E-13s

DOI:10.1039/d1tc04073a

Funding details: Number: TD2020031Y, Acronym: -, Sponsor: Shaanxi Normal University;Number: 2019TS117, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;

Funding text:The Postgraduate Innovation Team project of Shaanxi Normal University (TD2020031Y) and the Fundamental Research Funds For the Central Universities (2019TS117).

Database:Compendex

Accession number:20210409817755

Title:High-side mode suppression ratio with a high-stability external-cavity diode laser array at 976 nm in a wide temperature and current range

Authors:Liu, Bin (1, 2, 3); Liu, Hui (1); Zhu, Pengfei (3); Liu, Xingsheng (3)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Shaanxi; Xi'an; 710119, China; (2) Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Focuslight Technologies Inc, Shaanxi; Xi'an; 710077, China

Corresponding author:Liu, Hui(huiliu@xpu.edu.cn)

Source title:Optics Communications

Abbreviated source title:Opt Commun

Volume:486

Issue date:May 1, 2021

Publication year:2021

Article number:126792

Language:English

ISSN:00304018

CODEN:OPCOB8

Document type:Journal article (JA)

Publisher:Elsevier B.V.

Abstract:A high-side mode suppression ratio (SMSR) and high-stability external-cavity diode laser array employing optical feedback from a volume Bragg grating (VBG) with 15% diffraction efficiency at 976 nm was investigated. Based on the transfer matrix method and on the multimode rate equation, the theoretical model for an external-cavity diode laser at 976 nm was built for different temperature and current values. Both the simulated and the experimental results show that the temperature and the current range of such laser array with a front end reflectivity (R<inf>f</inf>) of 0.5% are 10 °C and 15 A broader than that for an external cavity with R<inf>f</inf> = 2%. As a result, the external-cavity diode laser array at 976 nm with a R<inf>f</inf> value of 0.5% exhibits a high stability in the temperature range of 15–35 °C and from 15 to 50 A. Moreover, it shows an SMSR higher than 30 dB and a power larger than 33.9 W at 50A.<br/> © 2021 Elsevier B.V.

Number of references:21

Main heading:Semiconductor lasers

Controlled terms:Transfer matrix method - Diodes

Uncontrolled terms:Current range - Current values - External cavity - External-cavity diode laser - Multimode rate equations - Temperature range - Theoretical modeling - Volume bragg grating (VBG)

Classification code:744.4.1 Semiconductor Lasers - 921 Mathematics

Numerical data indexing:Decibel 3.00e+01dB, Electric_Current 1.50e+01A, Electric_Current 1.50e+01A to 5.00e+01A, Electric_Current 5.00e+01A, Percentage 1.50e+01%, Percentage 2.00e+00%, Percentage 5.00e-01%, Power 3.39e+01W, Size 9.76e-07m, Temperature 2.83e+02K

DOI:10.1016/j.optcom.2021.126792

Funding details: Number: 2018YFB1107302, Acronym: -, Sponsor: National Key Research and Development Program of China;Number: 2018YFB1107303, Acronym: -, Sponsor: National Key Research and Development Program of China;

Funding text:We wish to acknowledge the support of National Key R&D Program of China (2018YFB1107302 and 2018YFB1107303).

Database:Compendex

Accession number:20214911292651

Title:A synchroscan streak tube with high deflection sensitivity (Open Access)

Title of translation:一种高偏转灵敏度同步扫描条纹管 (Open Access)

Authors:Liu, Xue-Ling (1, 2); Tian, Jin-Shou (1, 4); Tian, Li-Ping (3); Chen, Ping (1); Zhang, Min-Rui (1); Xue, Yan-Hua (1); Li, Ya-Hui (1, 2); Fang, Yu-Man (1, 2); Xu, Xiang-Yan (1); Liu, Bai-Yu (1); Gou, Yong-Sheng (1)

Author affiliation:(1) Key Laboratory of Ultra-fast Photoelectric Diagnostics Technology, State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) School of Network and Communication Engineering, Jinling Institute of Technology, Nanjing; 211169, China; (4) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China

Corresponding authors:Tian, Jin-Shou(tianjs@opt.ac.cn); Tian, Jin-Shou(tianjs@opt.ac.cn)

Source title:Wuli Xuebao/Acta Physica Sinica

Abbreviated source title:Wuli Xuebao

Volume:70

Issue:21

Issue date:November 2021

Publication year:2021

Article number:218502

Language:Chinese

ISSN:10003290

CODEN:WLHPAR

Document type:Journal article (JA)

Publisher:Institute of Physics, Chinese Academy of Sciences

Abstract:<div data-language="eng" data-ev-field="abstract">A synchroscan streak tube with high spatiotemporal resolution and high deflection sensitivity is proposed, which contains several innovation designs. Some measures are taken to improve the imaging performances of the streak tube. Firstly, in order to obtain a high deflection sensitivity, the difference in voltage between the photocathode and anode and the length of the equipotential region of the streak tube are reduced as much as possible. Secondly, by introducing a hyperfine grid behind the cathode, reasonably designing the voltages applied to the six-electrode electrostatic focusing system, and moving the electron beam crossing point to the entrance of the deflection plates, the temporal dispersion and the temporal distortion of the streak tube are reduced, and the spatiotemporal resolution of the streak tube is improved. Besides, the streak tube is technically analyzed by tracking the temporal and spatial distribution of electrons under an operating voltage of 7000 V with the aid of computer simulation technology (CST) software. The results show that the deflection sensitivity is 125 mm/kV, the physical temporal resolution is better than 1.83 ps @MTF = 10%, and the static spatial resolution on the photocathode is better than 38 lp/mm @MTF = 10% over the effective photocathode area with a size of 10 mm × 4 mm. By applying a synchronous scanning voltage with a repetition frequency of 250 MHz to the deflection electrode, the results show that the dynamic spatial resolution of the streak tube is better than 16 lp/mm, the limit of the dynamic temporal resolution is 1.39 ps, and two rectangular electron pulses with a size of 10 mm × 20 μm and an interval of 2.3 ps emitted from the photocathode can be well resolved by the streak tube. In addition, the experimental measurements are conducted with a streak tube developed in our laboratory. The results demonstrate that the photocathode of the streak tube can work in the entire visible light region, and the response in the short wavelength region is significantly better than that in the long wavelength region. The static spatial resolution of this streak tube is 40 lp/mm in the center of the photocathode. The temporal resolution of this streak tube is 5.55 ps measured under a synchronous scanning voltage with a repetition frequency of 75 MHz.<br/></div> © 2021 Chinese Physical Society.

Number of references:30

Main heading:Streak cameras

Controlled terms:Tubes (components) - Computer software - Image resolution - Photocathodes - Deflection (structures) - Light

Uncontrolled terms:Deflection sensitivities - Low light - Spatial resolution - Spatio-temporal resolution - Streak tubes - Synchronous scanning - Synchroscan streak tube - Temporal resolution - Ultra-fast - Ultra-fast low light diagnose

Classification code:408.2 Structural Members and Shapes - 619.1 Pipe, Piping and Pipelines - 714.1 Electron Tubes - 723 Computer Software, Data Handling and Applications - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 742.2 Photographic Equipment

Numerical data indexing:Frequency 2.50E+08Hz, Frequency 7.50E+07Hz, Percentage 1.00E+01%, Size 1.00E-02m, Size 1.25E-01m, Size 2.00E-05m, Size 4.00E-03m, Time 1.39E-12s, Time 1.83E-12s, Time 2.30E-12s, Time 5.55E-12s, Voltage 7.00E+03V

DOI:10.7498/aps.70.20210814

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20215111370190

Title:Physical characteristics and spillage detection Using multifeature fusion (Open Access)

Authors:Liu, Caiyu (1); Zhou, Zuofeng (2); Wu, Qingquan (3)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Shanxi, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100039, China; (3) Xi'an Institute of Optics and Precision Mechanics, Cas Industrial Development Co. Ltd., Xian; 710018, China

Corresponding author:Liu, Caiyu(liucaiyu20@mails.ucas.ac.cn)

Source title:Journal of Physics: Conference Series

Abbreviated source title:J. Phys. Conf. Ser.

Volume:2083

Part number:2 of 4

Issue:2

Issue title:2021 2nd International Conference on Applied Physics and Computing, ICAPC 2021 - 1. Applied Physics

Issue date:December 2, 2021

Publication year:2021

Article number:022041

Language:English

ISSN:17426588

E-ISSN:17426596

Document type:Conference article (CA)

Conference name:2021 2nd International Conference on Applied Physics and Computing, ICAPC 2021

Conference date:September 8, 2021 - September 10, 2021

Conference location:Ottawa, ON, Canada

Conference code:175431

Publisher:IOP Publishing Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">As an important part of road maintenance, the detection of road sprinkles has attracted extensive attention from scholars. However, after years of research, there are still some problems in the detection of road sprinkles. First of all, the detection accuracy of traditional detection algorithm is deficient. Second, deep learning approaches have great limitations for there are various kinds of sprinkles which makes it difficult to build a data set. In view of the above problems, this paper proposes a road sprinkling detection method based on multi-feature fusion. The characteristics of color, gradient, luminance and neighborhood information were considered in our method. Compared with other traditional methods, our method has higher detection accuracy. In addition, compared with deep learning-based methods, our approach doesn't involve creating a complex data set and reduces costs. The main contributions of this paper are as follows: I. For the first time, the density clustering algorithm is combined with the detection of sprinkles, which provides a new idea for this field. II. The use of multi-feature fusion improves the accuracy and robustness of the traditional method which makes the algorithm usable in many real-world scenarios.<br/></div> © 2021 Institute of Physics Publishing. All rights reserved.

Number of references:14

Main heading:Clustering algorithms

Controlled terms:Roads and streets - Deep learning - Feature extraction

Uncontrolled terms:Data set - Density clustering - Detection accuracy - Detection algorithm - Detection methods - Learning approach - Multi-feature fusion - Physical characteristics - Road maintenance - Spillage detection

Classification code:406.2 Roads and Streets - 461.4 Ergonomics and Human Factors Engineering - 903.1 Information Sources and Analysis

DOI:10.1088/1742-6596/2083/2/022041

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20211710255916

Title:Terahertz signatures and quantitative analysis of glucose anhydrate and monohydrate mixture

Authors:Yan, Hui (1, 2, 3); Fan, Wenhui (1, 3, 4); Chen, Xu (1); Liu, Lutao (1, 3); Wang, Hanqi (1, 3); Jiang, Xiaoqiang (1, 3)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) College of Science, Zhongyuan University of Technology, Zhengzhou 450007, China; Zhengzhou Key Laboratory of Low-dimensional Quantum Materials and Devices; (3) University of Chinese Academy of Sciences, Beijing; 100049, China; (4) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China

Corresponding author:Fan, Wenhui(fanwh@opt.ac.cn)

Source title:Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy

Abbreviated source title:Spectrochim. Acta Part A Mol. Biomol. Spectrosc.

Volume:258

Issue date:September 5, 2021

Publication year:2021

Article number:119825

Language:English

ISSN:13861425

CODEN:SAMCAS

Document type:Journal article (JA)

Publisher:Elsevier B.V.

Abstract:<div data-language="eng" data-ev-field="abstract">Glucose, as the main energy carrier and significant source of nutrition, generally comes in two available forms of anhydrate and monohydrate in commercial production. Considering their respective application occasions, proper identification of glucose in single composition or binary-mixture and quantification of the mixture are crucial in industry monitoring to guarantee merchandise quality. Simultaneously, public confusions of glucose are rather ubiquitous partly due to anhydrate and monohydrate with identical white crystalline appearance. In this paper, utilizing the molecular fingerprints of terahertz (THz) technology that are corresponding to structural characteristics of anhydrous and hydrated form, THz signatures of glucose anhydrate, monohydrate and their mixture, as well as THz spectral transformation from monohydrate to anhydrate with the dehydrating process are systematically studied. Some visible peaks of monohydrate were noted at 1.82 and 1.99 THz signifying the presence of hydrated structure. However, with the dehydrating process, the peaks related to the hydrated structure are not very apparent when the peaks at 1.44 and 2.08 THz appear due to changes in the molecular structure of anhydrate, which provide clear indication for hydrogen-bond network reconstruction at the micro level. Furthermore, characteristic peaks at 1.44 and 1.82 THz can be specified as the main quantitative indicators for quantitative detection. The linear relationships between the amplitudes of characteristic peaks and the percentage compositions of anhydrate and monohydrate are revealed. Three commercially available brands of edible glucose powder A, B, C were effectively identified by THz signatures. While powder C was recognized as binary-mixture and the proportion of anhydrate and monohydrate was further quantified. THz spectroscopy technology has advantages of direct recognition, simple quantitative model based on THz absorption peaks, and no need for complicated chemical treatment. It may be potentially shed light on industrial monitoring of glucose production and other related mixture in the future.<br/></div> © 2021 Elsevier B.V.

Number of references:47

Main heading:Chemical analysis

Controlled terms:Binary mixtures - Glucose - Hydration - Hydrogen bonds - Terahertz spectroscopy - Dehydration

Uncontrolled terms:Anhydrate and monohydrate - Anhydrates - Characteristic peaks - Commercial productions - Energy carriers - Molecular fingerprint - Structural characteristics - Tera Hertz - Terahertz signature - Terahertz technology

Classification code:801.4 Physical Chemistry - 802.2 Chemical Reactions - 804 Chemical Products Generally - 804.1 Organic Compounds - 931.1 Mechanics

Numerical data indexing:Frequency 1.44E+12Hz, Frequency 1.82E+12Hz, Frequency 1.99E+12Hz, Frequency 2.08E+12Hz

DOI:10.1016/j.saa.2021.119825

Funding details: Number: LSIT201913N, Acronym: -, Sponsor: -;Number: 61675230,61905276, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:This work was supported by the National Natural Science Foundation of China ( 61675230 , 61905276 ); Open Research Fund of Key Laboratory of Spectral Imaging Technology, Chinese Academy of Sciences ( LSIT201913N ).

Database:Compendex

Accession number:20210609889094

Title:Dark matter-wave gap solitons in dense ultracold atoms trapped by a one-dimensional optical lattice

Authors:Li, Jiawei (1, 2, 3); Zeng, Jianhua (1, 3)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi'an; 710119, China; (2) Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Shaanxi Key Lab of Information Photonic Technique, Xi'An Jiaotong University, Xi'an; 710049, China; (3) School of Optoelectronics, University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Zeng, Jianhua(zengjh@opt.ac.cn)

Source title:Physical Review A

Abbreviated source title:Phys. Rev. A

Volume:103

Issue:1

Issue date:January 2021

Publication year:2021

Article number:A17

Language:English

ISSN:24699926

E-ISSN:24699934

Document type:Journal article (JA)

Publisher:American Physical Society

Abstract:Optical lattices have been used as a versatile toolbox to control Bose-Einstein condensates (BECs) in recent years, and a wealth of emergent nonlinear phenomena have been found, including bright gap solitons and dark ones, among which the former has been realized in experiments. The latter, however, has only theoretical results and its fundamental properties are still not well understood. Here we theoretically and numerically explore an open issue of creating stable matter-wave dark gap solitons in a one-dimensional optical lattice, onto which the BECs with self-defocusing quintic nonlinearity are loaded. Using linear-stability analysis and direct simulations, the formation, structures, and properties of dark gap solitons in quintic nonlinearity have been compared to those upheld by cubic Kerr nonlinearity. In particular, we uncover that the dark gap solitons and soliton clusters are robustly stable in the first finite band gap of the underlying linear spectrum, and are hard to be stabilized in the second gap. The predicted dark gap solitons are observable in current experiments on dense ultracold atoms, using an optical lattice technique, and in the optics domain for nonlinear light propagation in periodic optical media with quintic nonlinearity.<br/> © 2021 American Physical Society.

Number of references:74

Main heading:Optical lattices

Controlled terms:Nonlinear optics - Bose-Einstein condensation - Linear stability analysis - Statistical mechanics - Energy gap - Solitons - Optical materials - Crystal lattices

Uncontrolled terms:Bose-Einstein condensates - Direct simulation - Fundamental properties - Kerr nonlinearity - Non-linear phenomena - One dimensional optical lattice - Quintic nonlinearity - Soliton clusters

Classification code:741.1.1 Nonlinear Optics - 741.3 Optical Devices and Systems - 744.8 Laser Beam Interactions - 921 Mathematics - 922.2 Mathematical Statistics - 931.1 Mechanics - 931.2 Physical Properties of Gases, Liquids and Solids - 931.3 Atomic and Molecular Physics - 933.1.1 Crystal Lattice

DOI:10.1103/PhysRevA.103.013320

Funding details: Number: S19-020-III, Acronym: -, Sponsor: -;Number: 12074423,61690222,61690224, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: J20-021-III, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2019JCW-03, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;

Funding text:This work was supported by the National Natural Science Foundation of China (NSFC) (Grants No. 61690224, No. 61690222, No. 12074423), the Major Science and Technology Infrastructure Pre-research Program of the CAS (Grant No. J20-021-III), the Natural Science Basic Research Program of Shaanxi (Grant No. 2019JCW-03), and the Key Deployment Research Program of XIOPM (Grant No. S19-020-III).

Database:Compendex

Accession number:20213410811243

Title:Lensless multimode fiber imaging based on wavefront shaping

Authors:Zhang, Zaikun (1, 2, 3, 4); Kong, Depeng (3); Geng, Yi (1, 2, 3); Chen, Hui (1, 2, 3); Wang, Ruiduo (1, 2, 3); Da, Zhengshang (4); He, Zhengquan (3)

Corresponding author:He, Zhengquan(zhqhe@opt.ac.cn)

Source title:Applied Physics Express

Abbreviated source title:Appl. Phys. Express

Volume:14

Issue:9

Issue date:September 2021

Publication year:2021

Article number:092002

Language:English

ISSN:18820778

E-ISSN:18820786

Document type:Journal article (JA)

Publisher:IOP Publishing Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">In this letter, we proposed a compact multimode fiber (MMF)-based laser scanning endoscope (LSE) using wavefront shaping with a liquid crystal spatial light modulator. Experimentally, we demonstrated the lensless imaging capability of the LSE using a negative USAF-1951 test target placed near the distal MMF facet, obtaining ~7000-pixel images with micro-level spatial resolution and high contrast across a 105 μm field of view. This study proves the feasibility of a single MMF imaging without mechanical scanning, and also paves the way for ultra-thin micro-endoscopic imaging.<br/></div> © 2021 The Japan Society of Applied Physics.

Number of references:30

Main heading:Multimode fibers

Controlled terms:Light modulators - Wavefronts - Liquid crystals - Endoscopy

Uncontrolled terms:Endoscopic imaging - Laser scanning - Lens-less imaging - Liquid crystal spatial light modulators - Mechanical scanning - Multi-mode fibers (MMF) - Spatial resolution - Wave front shaping

Classification code:461.6 Medicine and Pharmacology - 741.1.2 Fiber Optics

Numerical data indexing:Size 1.05e-04m

DOI:10.35848/1882-0786/ac19d4

Funding details: Number: 61535015, Acronym: NNSFC, Sponsor: National Natural Science Foundation of China;

Funding text:National Natural Science Foundation of China (61535015).

Database:Compendex

Accession number:20212010360071

Title:Performance Optimization and Experimental Research of Continuous Wave Coherent Wind Lidar

Title of translation:连续模式相干测风激光雷达性能优化分析及实验研究

Authors:Yang, Wuhao (1, 2); Zhang, Pu (1); Yang, Xinfeng (3); Chen, Qimin (1, 4); Zhao, Wei (1)

Corresponding author:Zhang, Pu(zhangpu@opt.ac.cn)

Source title:Guangzi Xuebao/Acta Photonica Sinica

Abbreviated source title:Guangzi Xuebao

Volume:50

Issue:4

Issue date:April 25, 2021

Publication year:2021

Article number:0401004

Language:Chinese

ISSN:10044213

CODEN:GUXUED

Document type:Journal article (JA)

Publisher:Chinese Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">Based on the requirement of wind velocity measurement, an all-fiber doppler coherent wind lidar system is built with continuous wave laser source at band 1 550 nm. It is analyzed theoretically for the Carrier-to-noise ratio function of the continuous wave coherent lidar and the weighing function of the wind velocity at different focusing distance on the basis of the lidar equation. A vari-focusing optical antenna with the focusing distance range from 5 m to 200 m is designed and fabricated according to the requirement of wind detection. The optical beam expanding module adopts the Galilean refractive structure with the beam expanding ratio as 23 and the optical quality is close to the diffraction limit. The calibration test is executed by using a rotating motor disk. The rotation speed range of the disk is from -3 000 r/min to +3 000 r/min. The diameter of the disk is 26 cm. While the doppler frequency shift of the line of sight velocity is positive and negative, the correlation coefficients between the velocity measurement data of the lidar system and the theoretical calculation result are 0.998 and 0.993. At the same time the standard deviations of velocity are 0.151 m/s and 0.229 m/s, respectively. The wind lidar is then used to measure the atmospheric wind speed. It works correctly to apply the wind lidar to measure the atmospheric wind velocity.<br/></div> © 2021, Science Press. All right reserved.

Number of references:17

Main heading:Continuous wave lasers

Controlled terms:Antennas - Velocity measurement - Optical radar - Rotating disks - Rotation rate - Diffraction - Doppler effect - Velocity - Focusing - Wind speed

Uncontrolled terms:Carrier to noise ratio - Correlation coefficient - Diffraction limits - Doppler frequency shift - Experimental research - Performance optimizations - Theoretical calculations - Wind velocity measurement

Classification code:601.2 Machine Components - 615.8 Wind Power (Before 1993, use code 611 ) - 716.2 Radar Systems and Equipment - 741.3 Optical Devices and Systems - 744.1 Lasers, General - 931.1 Mechanics - 943.3 Special Purpose Instruments

Numerical data indexing:Size 1.55e-06m, Size 2.60e-01m, Size 5.00e+00m to 2.00e+02m, Velocity 1.51e-01m/s, Velocity 2.29e-01m/s

DOI:10.3788/gzxb20215004.0401004

Funding details: Number: Y929471233, Acronym: CAS, Sponsor: Chinese Academy of Sciences;

Funding text:Western Young Scholars Foundation of the Chinese Academy of Sciences (No. Y929471233).

Database:Compendex

Accession number:20214010971052

Title:Broadband hybrid plasmonic graphene modulator operating at mid-Infrared wavelength

Authors:Ban, Xiaoqiang (1, 2); Zhong, Ming (3); Little, Brent E. (1, 2)

Corresponding author:Ban, Xiaoqiang(banxiaoqiangcas@163.com)

Source title:Optik

Abbreviated source title:Optik

Volume:247

Issue date:December 2021

Publication year:2021

Article number:168036

Language:English

ISSN:00304026

Document type:Journal article (JA)

Publisher:Elsevier GmbH

Abstract:<div data-language="eng" data-ev-field="abstract">A broadband modulator with hybrid plasmonic graphene waveguide is proposed. The waveguide is very convenient to transfer graphene and improve fabrication tolerance. We use tip enhancement effect of graphene-based hybrid wedge SPPs mode to enhance light absorption modulation. The interaction between the hybrid plasmonic graphene structure and the optical field is numerically investigated. We get the geometrical optimization value by sweeping the parameter with FDTD method. The result demonstrates that modulation depth of our proposed modulator exceeds 3 dB when wavelength changes from 3.3 to 3.7 µm. Moreover, compared with previous papers, our proposed modulator can obtain broader modulation bandwidth (156.49 GHz) and need lower power consumption (477 fJ/bit), which has a better performance in potential applications such as optoelectronic countermeasure systems and optical signal processing.<br/></div> © 2021 Elsevier GmbH

Number of references:44

Main heading:Graphene

Controlled terms:Finite difference time domain method - Modulation - Light modulators - Infrared devices - Optical signal processing - Light absorption - Waveguides - Plasmonics

Uncontrolled terms:Absorption modulation - Broadband - Broadband modulators - Enhancement effects - Fabrication tolerances - Hybrid plasmonic modulator - Mid-infrared wavelengths - Midinfrared - Optical field - Plasmonics

Classification code:714.3 Waveguides - 741.1 Light/Optics - 761 Nanotechnology - 804 Chemical Products Generally - 921 Mathematics - 932.3 Plasma Physics

Numerical data indexing:Decibel 3.00E+00dB, Frequency 1.5649E+11Hz

DOI:10.1016/j.ijleo.2021.168036

Funding details: Number: 61605106, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:This research has been sponsored by the National Natural Science Foundation of China (Grant No. 61605106 ).

Database:Compendex

Accession number:20210509869988

Title:Flower-Shaped Optical Vortex Array

Authors:Fan, Haihao (1, 2); Zhang, Hao (1); Cai, Chenyuan (3); Tang, Miaomiao (1); Li, Hehe (1); Tang, Jie (2); Li, Xinzhong (1, 2)

Author affiliation:(1) School of Physics and Engineering, Henan University of Science and Technology, Luoyang; 471023, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China; (3) Luoyang First Senior High School, Luoyang; 471023, China

Corresponding authors:Li, Xinzhong(xzli@haust.edu.cn); Li, Xinzhong(xzli@haust.edu.cn)

Source title:Annalen der Physik

Abbreviated source title:Ann Phys Leipzig

Volume:533

Issue:4

Issue date:April 2021

Publication year:2021

Article number:2000575

Language:English

ISSN:00033804

E-ISSN:15213889

CODEN:ANPYA2

Document type:Journal article (JA)

Publisher:John Wiley and Sons Inc

Abstract:<div data-language="eng" data-ev-field="abstract">Herein, the generation of an optical vortex array dubbed the flower-shaped optical vortex array (FOVA) is proposed and experimentally demonstrated using a single optical path interference method. FOVA is generated by the superposition of even and odd Ince–Gaussian (IG) beams, which have the same degree m and different order p. The number of optical vortices (OVs) in the FOVA is determined based on the values of order p and degree m of the even and odd IG beams. Furthermore, the positive sign of the OVs in the array can be transformed to negative by adding a specific initial phase difference. The OVs vanish and then recover as the initial phase difference increases from 0 to 2π. Moreover, the gradient force and energy flow distribution of the FOVA are studied. The OVA with flower-shaped structure generated herein has potential significance in applications, such as microparticle manipulation and optical measurements.<br/></div> © 2021 Wiley-VCH GmbH

Number of references:52

Main heading:Physical optics

Controlled terms:Optical data processing - Gaussian beams - Vortex flow

Uncontrolled terms:Flower-shaped - Gradient force - Interference methods - Microparticle manipulations - Optical measurement - Optical path - Optical vortices - Phase difference

Classification code:631.1 Fluid Flow, General - 711 Electromagnetic Waves - 723.2 Data Processing and Image Processing - 741.1 Light/Optics

DOI:10.1002/andp.202000575

Funding details: Number: 21zx002, Acronym: -, Sponsor: -;Number: 11704098,11974101,11974102, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: SKLST201901, Acronym: SKLTOP, Sponsor: State Key Laboratory of Transient Optics and Photonics;

Funding text:H.F. and H.Z. contributed equally to this work. This work was supported by the National Natural Science Foundation of China (11974102, 11704098, and 11974101), State Key Laboratory of Transient Optics and Photonics (SKLST201901), and Key Scientific Research Projects of Institutions of Higher Learning of Henan Province Education Department (No. 21zx002).

Database:Compendex

Accession number:20213410810256

Title:Stray Light Suppression in Sweep Mirror Field-Widened Space-Borne Fourier Transform Imaging Spectrometer

Title of translation:侧摆扩视场型星载干涉光谱成像仪杂散光抑制研究

Authors:Zhang, Zhinan (1, 2); Li, Libo (1); Zou, Chunbo (1); Hao, Xiongbo (1); Sun, Jian (1, 2); Liu, Xuebin (1); Wang, Pengchong (1); Liu, Jie (1, 2)

Author affiliation:(1) Key Laboratory of Spectral Imaging Technology, Xian's Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Li, Libo(lilibo@opt.ac.cn)

Source title:Guangxue Xuebao/Acta Optica Sinica

Abbreviated source title:Guangxue Xuebao

Volume:41

Issue:10

Issue date:May 25, 2021

Publication year:2021

Article number:1029001

Language:Chinese

ISSN:02532239

CODEN:GUXUDC

Document type:Journal article (JA)

Publisher:Chinese Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">The field widening of a sweep mirror field-widened Fourier transform imaging spectrometer is achieved by adding a sweep mirror before its optical system. However, the addition of the sweep mirror causes the cross distribution of rays from different fields and different channels, which presents a difficulty in the suppression of stray light, and thus the traditional stray light suppression design is no longer valid. To solve this problem, a new design of stray light suppression is proposed. Based on the stray light suppression design, the point source transmittance (PST) stimulation and analysis of the visible and near-infrared optical system and the shortwave infrared optical system is presented for the sweep mirror at different field of view locations of 0°, 15°, and -15°. The analysis results show that as for all sweep mirror locations, the PST along the spatial direction and spectral direction at 0.5° off-field angle can be reduced to 10<sup>-3</sup>. Based on the observation mode, the signal source and stray light source of the on-orbit imaging spectrometer are analyzed. In addition, based on the PST stimulation results, the stray light irradiance at the focal plane is studied and the signal-to-stray ratio is calculated. It shows that the signal-to-stray ratio of the visible and near-infrared optical system is 0.1% and that of the shortwave infrared optical system is 0.6%. The results indicate that the proposed stray light suppression method is effective and can meet the requirement of the space-borne imaging spectrometer.<br/></div> © 2021, Chinese Lasers Press. All right reserved.

Number of references:14

Main heading:Stray light

Controlled terms:Infrared devices - Mirrors - Light sources - Optical systems - Spectrometers

Uncontrolled terms:Fourier transform imaging spectrometers - Imaging spectrometers - Light irradiances - Short wave infrared - Spatial direction - Spectral directions - Stray light suppression - Visible and near infrared

Classification code:741.1 Light/Optics - 741.3 Optical Devices and Systems

Numerical data indexing:Percentage 1.00e-01%, Percentage 6.00e-01%

DOI:10.3788/AOS202141.1029001

Database:Compendex

Accession number:20210509855656

Title:Tunable all-optical AND logic gates via four-wave mixing based on graphene-on-silicon slot microring resonators

Authors:Wu, Wei (1, 2); Sun, Qibing (1, 3); Wang, Guoxi (1, 2); Zhang, Lingxuan (1, 3); Zhao, Wei (1, 2)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) School of Future Technology, University of Chinese Academy of Sciences, Beijing; 100049, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Sun, Qibing(qbsun@opt.ac.cn)

Source title:Optics and Laser Technology

Abbreviated source title:Opt Laser Technol

Volume:138

Issue date:June 2021

Publication year:2021

Article number:106926

Language:English

ISSN:00303992

CODEN:OLTCAS

Document type:Journal article (JA)

Publisher:Elsevier Ltd

Abstract:We propose a novel graphene-on-silicon organic hybrid slot microring resonator (GSHMIR) for tunable all-optical logic gates, which could offer broadband ultra-flattened dispersion with multiple zero-dispersion wavelengths (ZDWs) and high nonlinearity coefficient of 1.67 × 10<sup>4</sup> W<sup>−1</sup>m<sup>−1</sup>. Further investigations on temporal evolution dynamics for all-optical logic function suggest that the third-order dispersion will induce the temporal drift and tail oscillation of output pulses. The tunable all-optical AND logic function over the wavelength range from 1536 nm to 1569 nm could be obtained for 40 Gb/s signals with the conversion efficiency as high as −6.4 dB. These results are essential for all-optical wavelength division multiplexer (WDM) technology of future integrated optoelectronic systems, as well as providing a novel architecture for on-chip optical communications.<br/> © 2021 Elsevier Ltd

Number of references:42

Main heading:Four wave mixing

Controlled terms:Computer circuits - Graphene - Optical signal processing - Optoelectronic devices - Logic gates - Silicon - Optical communication - Dispersion (waves) - Integrated optics

Uncontrolled terms:All-optical logic gates - Flattened dispersion - High nonlinearity - Microring resonator - Novel architecture - Temporal evolution - Third order dispersion - Zero-dispersion wavelength

Classification code:549.3 Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals - 717.1 Optical Communication Systems - 721.2 Logic Elements - 721.3 Computer Circuits - 741.3 Optical Devices and Systems - 761 Nanotechnology - 804 Chemical Products Generally

Numerical data indexing:Bit_Rate 4.00e+10bit/s, Size 1.54e-06m to 1.57e-06m

DOI:10.1016/j.optlastec.2021.106926

Funding details: Number: 61635013,61675231,61705257, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: XDB24030600, Acronym: CAS, Sponsor: Chinese Academy of Sciences;

Funding text:This research was supported by the National Natural Science Foundation of China (Grant No. 61705257, 61635013 and 61675231) and Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB24030600).

Database:Compendex

Accession number:20211710259064

Title:High Efficiency 1.9 Kw Single Diode Laser Bar Epitaxially Stacked with a Tunnel Junction (Open Access)

Authors:Zhao, Yuliang (1, 2); Wang, Zhenfu (1); Demir, Abdullah (5); Yang, Guowen (1, 2); Ma, Shufang (3); Xu, Bingshe (3); Sun, Cheng (4); Li, Bo (4); Qiu, Bocang (1)

Corresponding authors:Wang, Zhenfu(wzf2718@opt.ac.cn); Qiu, Bocang(qiubocang@opt.ac.cn)

Source title:IEEE Photonics Journal

Abbreviated source title:IEEE Photon. J.

Volume:13

Issue:3

Issue date:June 2021

Publication year:2021

Article number:9406342

Language:English

E-ISSN:19430655

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">We report on the development of a 940-nm diode laser bar based on epitaxially stacked active regions by employing a tunnel junction structure. The tunnel junction and the device parameters were systematically optimized to achieve high output and power conversion efficiency. A record quasi-continuous wave (QCW) peak power of 1.91 kW at 25 °C was demonstrated from a 1-cm wide bar with a 2-mm cavity length at 1 kA drive current (200 μs pulse width and 10 Hz repetition rate). Below the onset of the thermal rollover, the slope efficiency was as high as 2.23 W/A. The maximum power conversion efficiency of 61.1% at 25 °C was measured at 300 A. Reducing the heatsink temperature to 15 °C led to a marginal increase in the peak power to 1.95 kW.<br/></div> © 2009-2012 IEEE.

Number of references:24

Main heading:Tunnel junctions

Controlled terms:Semiconductor lasers - Semiconductor junctions - Semiconductor diodes - Conversion efficiency - Pulse repetition rate

Uncontrolled terms:Device parameters - Diode laser bar - Junction structure - Power conversion efficiencies - Quasi-continuous waves - Repetition rate - Slope efficiencies - Thermal rollover

Classification code:525.5 Energy Conversion Issues - 714.2 Semiconductor Devices and Integrated Circuits - 744.1 Lasers, General - 744.4.1 Semiconductor Lasers

Numerical data indexing:Electric_Current 1.00e+03A, Electric_Current 3.00e+02A, Frequency 1.00e+01Hz, Percentage 6.11e+01%, Power 1.90e+03W, Power 1.91e+03W, Power 1.95e+03W, Size 1.00e-02m, Size 2.00e-03m, Size 9.40e-07m, Time 2.00e+02s

DOI:10.1109/JPHOT.2021.3073732

Funding details: Number: 61504167, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2015JQ6263, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;Number: Y855J61213, Acronym: XIOPM, Sponsor: Xi'an Institute of Optics and Precision Mechanics;

Funding text:Manuscript received January 28, 2021; revised March 29, 2021; accepted April 12, 2021. Date of publication April 16, 2021; date of current version May 18, 2021. This work was supported in part by Project of Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences Y855J61213, in part by National Natural Science Foundation of China under Grant 61504167, and in part by the Natural Science Foundation of Shaanxi Province under Grant 2015JQ6263. Corresponding authors: Zhenfu Wang and Bocang Qiu (e-mail: wzf2718@opt.ac.cn; qiubocang@opt.ac.cn).

Database:Compendex

Open Access type(s): All Open Access, Gold, Green

Accession number:20214811229521

Title:Analysis of a higher-energy structure in nanotip enhanced fields (Open Access)

Authors:Gao, Xu-Zhen (1, 2, 3); Landsman, Alexandra S. (4); Wang, Hushan (1); Huang, Pei (1); Zhang, Yanpeng (2); Wang, Bo (1); Wang, Yishan (1); Cao, Huabao (1); Fu, Yuxi (1); Pi, Liang-Wen (1, 3)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) Key Laboratory for Physical Electronics and Devices, Ministry of Education, Shaanxi Key Lab of Information Photonic Technique, Xi'An JiaoTong University, Xi'an; 710049, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China; (4) Department of Physics, The Ohio State University, Columbus; OH; 43210, United States

Corresponding authors:Pi, Liang-Wen(lwpi@opt.ac.cn); Landsman, Alexandra S.(landsman.7@osu.edu)

Source title:New Journal of Physics

Abbreviated source title:New J. Phys.

Volume:23

Issue:11

Issue date:November 2021

Publication year:2021

Article number:113017

Language:English

ISSN:13672630

Document type:Journal article (JA)

Publisher:IOP Publishing Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">We investigate strong field ionization of an atomic gas in a plasmonically enhanced field resulting from the illumination of a nanometer-sized structure with ultrafast laser pulse. We use perturbation theory to derive an approximate solution for electron's motion following ionization. These analytical estimates are corroborated by the time-dependent Schrödinger equation and classical trajectory Monte Carlo simulations. Notably, our approach can be used to obtain electron energy spectra without having to rely on numerical simulations. This allows for a deeper study of the dependence of electron energy spectrum on the properties of the near-field, suggesting electric field sensor applications. We derive an analytical expression for the location of the peak of the higher-energy structure (HES) as a function of laser parameters and near-field decay length.We find a particularly strong dependence of the energy peak on laser frequency, with lower frequencies causing a significant upward shift in the final electron energies. Combined with control of the width of the HES, which can be done by changing the size of the nanostructure, this points to the possibility of using nanotips as sources of ultrashort electron beams of tunable energy.<br/></div> © 2021 The Author(s).

Number of references:46

Main heading:Electric fields

Controlled terms:Dissociation - Nanotips - Electron energy levels - Intelligent systems - Electrons - Monte Carlo methods - Ultrafast lasers - Ionization of gases - Spectroscopy - Perturbation techniques

Uncontrolled terms:Atomic gas - Direct ionization - Electron dynamics - Electron energy spectrum - High energy structures - Inhomogeneous fields - Near fields - Perturbation method - Strong field ionization - Ultrafast laser pulse

Classification code:701.1 Electricity: Basic Concepts and Phenomena - 723.4 Artificial Intelligence - 744.1 Lasers, General - 761 Nanotechnology - 802.2 Chemical Reactions - 921 Mathematics - 922.2 Mathematical Statistics - 933 Solid State Physics

DOI:10.1088/1367-2630/ac320c

Funding details: Number: S19-020-III, Acronym: -, Sponsor: -;Number: 61690222, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: J19-121-III,J20-021-III,S19-001, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2019JCW-03,2021ZY-JC-01, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;

Funding text:This research is supported in part by the Chinese Academy of Sciences (No. J19-121-III, No. S19-001), Major Science and Technology Infrastructure Pre-research Program of the CAS (No. J20-021-III), Key Deployment Research Program of XIOPM (No. S19-020-III), Attosecond Science and Technology Innovation Team of Shaanxi, Natural Science Basic Research Program of Shaanxi (No. 2019JCW-03, No. 2021ZY-JC-01), National Natural Science Foundation of China (No. 61690222).

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20211510213134

Title:2.86 μm emission and fluorescence enhancement through controlled precipitation of ZnTe nanocrystals in DyF<inf>3</inf> doped multicomponent tellurite oxyfluoride glass

Authors:Wan, Rui (1, 2); Wang, Pengfei (1, 2); Li, Shengwu (1, 2); Ma, Yuan (1, 2)

Corresponding author:Wang, Pengfei(pfwang@opt.ac.cn)

Source title:Journal of Non-Crystalline Solids

Abbreviated source title:J Non Cryst Solids

Volume:564

Issue date:July 15, 2021

Publication year:2021

Article number:120842

Language:English

ISSN:00223093

CODEN:JNCSBJ

Document type:Journal article (JA)

Publisher:Elsevier B.V.

Abstract:<div data-language="eng" data-ev-field="abstract">Tellurite oxyfluoride glasses with composition of 71TeO<inf>2</inf>-10ZnO-10BaF<inf>2</inf>-4K<inf>2</inf>O-3Nb<inf>2</inf>O<inf>5</inf>-2TiO<inf>2</inf> doped with different concentrations of DyF<inf>3</inf> (0.3, 0.4, 0.5, 0.7, 1 wt%) were prepared by melt-quenching method under dry O<inf>2</inf> atmosphere. Under 808 nm laser pumping, infrared (IR) fluorescence emission with central wavelength of 2.86 μm was detected. Basing on the Judd-Ofelt (J-O) theory, the intensity parameters (Ω<inf>λ</inf>, λ=2, 4 and 6) and radiative property were calculated and characterized through the transmission and fluorescence spectra. The tellurite oxyfluoride glass had high thermal stability and large emission cross-section at 2.86 μm (7.82 × 10<sup>−21</sup> cm<sup>2</sup>). DyF<inf>3</inf> doped tellurite oxyfluoride glass ceramic were prepared via in-situ crystallization of ZnTe nanocrystals through heat treatment to ameliorate the surrounding environment of rare earth (RE) ions. The tellurite oxyfluoride glass ceramic prepared by heat treatment at 390°C had great enhancement in 2.86 μm fluorescence intensity (about 7 times), longer fluorescence lifetime (126 μs), indicating that the in-situ crystallization method may be helpful for exploring tellurite based high gain laser glass.<br/></div> © 2021

Number of references:53

Main heading:Glass ceramics

Controlled terms:Neodymium compounds - II-VI semiconductors - Niobium oxide - Nanocrystals - Pumping (laser) - Rare earths - Tellurium compounds - Zinc oxide - Barium compounds - Dysprosium compounds - Heat treatment - Judd-Ofelt theory - Titanium dioxide - Fluorescence

Uncontrolled terms:Controlled precipitation - Emission enhancement - Fluorescence enhancement - Glass-ceramics - In-situ crystallization - Infrared fluorescences - Judd- Ofelt theories - Oxyfluoride glass - Oxyfluoride glass-ceramics - Tellurite oxyfluoride glass

Classification code:537.1 Heat Treatment Processes - 712.1 Semiconducting Materials - 741.1 Light/Optics - 744.1 Lasers, General - 761 Nanotechnology - 804 Chemical Products Generally - 804.2 Inorganic Compounds - 931.3 Atomic and Molecular Physics - 933.1 Crystalline Solids

Numerical data indexing:Pressure 2.02E+05Pa, Size 2.10E-01m, Size 2.86E-06m, Size 8.08E-07m, Temperature 2.00E+00K to 4.00E+00K, Temperature 6.63E+02K, Time 1.26E-04s

DOI:10.1016/j.jnoncrysol.2021.120842

Funding details: Number: 61775235, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: XAB2016A08, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2017446, Acronym: -, Sponsor: Youth Innovation Promotion Association of the Chinese Academy of Sciences;Number: 2021GY-251, Acronym: -, Sponsor: Shanxi Provincial Key Research and Development Project;

Funding text:This work is financially supported by the National Natural Science Foundation of China (NSFC No. 61775235 ), West Young Scholars Program of the Chinese Academy of Sciences ( XAB2016A08 ), the Youth Innovation Promotion Association, CAS ( 2017446 ) and the Shaanxi Provincial Key Research and Development Program ( 2021GY-251 ).

Database:Compendex

Accession number:20212010359869

Title:Spatio-temporal Resolution Studies on a Synchronous Streak Tube

Title of translation:同步扫描管时空分辨特性研究

Authors:Tian, Liping (1); Shen, Lingbin (1); Chen, Lin (1); Li, Lili (2); Chen, Ping (2); Tian, Jinshou (2)

Author affiliation:(1) School of Network and Communication Engineering, Jinling Institute of Technology, Nanjing; 211169, China; (2) Key Laboratory of Ultra-fast Photoelectric Diagnostics Technology, State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China

Corresponding author:Tian, Jinshou(tianjs@opt.ac.cn)

Source title:Guangzi Xuebao/Acta Photonica Sinica

Abbreviated source title:Guangzi Xuebao

Volume:50

Issue:4

Issue date:April 25, 2021

Publication year:2021

Article number:0404002

Language:English

ISSN:10044213

CODEN:GUXUED

Document type:Journal article (JA)

Publisher:Chinese Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">A synchronous streak tube capable of providing high spatial resolution, high temporal resolution and large working area is numerically designed and experimentally demonstrated. In this paper, a 3-D model developed to systematically and comprehensively analyze the dependence of the physical temporal resolution on the accelerating voltage, the spatial resolution on the deflector-to-cathode distance, the dynamic spatial resolution and temporal resolution on the scanning velocity. Finally, geometry and electric parameters of d<inf>DC</inf>=100 mm, U<inf>g</inf>=700 V, and T<inf>screen</inf>= 0.5 ns are proposed to optimize the streak tube performances. The numerical simulations show that the static spatial resolution is higher than 25 lp/mm@MTF=10% and the dynamic spatial resolution is higher than 16 lp/mm@MTF=10% over the whole effective photocathode area of 18 mm×2 mm. And, the simulated temporal resolution is better than 5.6 ps at T<inf>screen</inf>=0.5 ns. Furthermore, the photocathode radiant sensitivity can reach 51 mA/W at the wavelength of 400 nm. The tested static spatial resolution is as high as 25 lp/mm@CTF=13%.<br/></div> © 2021, Science Press. All right reserved.

Number of references:14

Main heading:Photocathodes

Controlled terms:Dynamics - Image resolution - Streak cameras

Uncontrolled terms:Accelerating voltages - Electric parameters - High spatial resolution - High temporal resolution - Scanning velocity - Spatial resolution - Spatio-temporal resolution - Temporal resolution

Classification code:714.1 Electron Tubes - 741.3 Optical Devices and Systems - 742.2 Photographic Equipment

Numerical data indexing:Size 4.00e-07m, Time 5.00e-10s, Time 5.60e-12s

DOI:10.3788/gzxb20215004.0404002

Funding details: Number: 12005083, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: GJJSTD20190004, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: BK20190112, Acronym: -, Sponsor: Natural Science Foundation of Jiangsu Province;Number: jit-b-202012, Acronym: JIT, Sponsor: Jinling Institute of Technology;

Funding text:Foundation item：Ph.D. Project Supported by the Jinling Institute of Technology（Nos. jit-b-202012，jit-b-201814），the Natural Science Foundation of Jiangsu Province，China（No. BK20190112），the National Natural Science Fund（No. 12005083），the Scientific Instrument Developing Project of the Chinese Academy of Sciences（No. GJJSTD20190004）. First author：TIAN Liping（1990—），female，lecturer，Ph.D. degree，mainly focuses on electro-optical system design. Email： tianliping@jit.edu.cn. Corresponding author：TIAN Jinshou（1970—），male，professor，Ph.D. degree，mainly focuses on ultrafast diagnostic technology and photoelectric imaging technology. Email：tianjs@opt.ac.cn Received：Oct.23，2020；Accepted：Feb.14，2021Ph.D. Project Supported by the Jinling Institute of Technology (Nos. jit-b-202012, jit-b-201814), the?Natural?Science?Foundation?of?Jiangsu?Province, China (No. BK20190112), the National Natural Science Fund (No. 12005083), the Scientific Instrument Developing Project of the Chinese Academy of Sciences (No. GJJSTD20190004).

Database:Compendex

Accession number:20203909239219

Title:The dual-injection Ge-on-Si photodetectors with high saturation power by optimizing light field distribution

Authors:Cui, Jishi (1); Li, Tiantian (2); Yang, Fenghe (3); Cui, Wenjing (1); Chen, Hongmin (1)

Author affiliation:(1) School of Information Engineering, Sanming University, Sanming; 365004, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences (CAS), Xi'an; 710119, China; (3) Peking University Yangtze Delta Institute of Optoelectronics, Nantong; 226006, China

Corresponding author:Cui, Jishi(jscui@fjsmu.edu.cn)

Source title:Optics Communications

Abbreviated source title:Opt Commun

Volume:480

Issue date:1 February 2021

Publication year:2021

Article number:126467

Language:English

ISSN:00304018

CODEN:OPCOB8

Document type:Journal article (JA)

Publisher:Elsevier B.V., Netherlands

Abstract:In this work, we put forward the length design principle of the dual-injection integrated Ge-on-Si photodetectors based on the characteristics of the light field distribution. When the length of the absorption layer makes the maximum intensity of the incident light from both ends are alternately distributed, the light field distribution is more uniform. Based on this principle, the shorter photodetector could get better saturation performance. Two dual-injection photodetectors with the length of 6μm and 10μm have been investigated, the experimental results show that the saturation current of 6μm length device is 18.33% higher, and the bandwidth is 138.60% higher at 10 mW incident power comparing with the 10μm length device. The 6μm length photodetector realized a responsivity of 1.07 A/W, a bandwidth of 37.3 GHz at 50 μW luminous power @1550 nm.<br/> © 2020 Elsevier B.V.

Number of references:27

Main heading:Photodetectors

Controlled terms:Photons - Incident light - Silicon photonics - Bandwidth

Uncontrolled terms:Absorption layer - Dual injections - Ge-on-si photodetectors - Length designs - Light field distribution - Maximum intensities - Saturation current - Saturation power

Classification code:716.1 Information Theory and Signal Processing - 741.1 Light/Optics - 931.3 Atomic and Molecular Physics

Numerical data indexing:Frequency 3.73e+10Hz, Percentage 1.39e+02%, Percentage 1.83e+01%, Power 1.00e-02W, Power 5.00e-05W, Size 1.00e-05m, Size 6.00e-06m

DOI:10.1016/j.optcom.2020.126467

Funding details: Number: -, Acronym: LOCT, Sponsor: State Key Laboratory of Advanced Optical Communication Systems and Networks.;

Funding text:This work was supported in part by State Key Laboratory of Advanced Optical Communication Systems and Networks, China , in part by Digital Fujian Research Institute for Industrial Energy Big Data, China , in part by Fujian Province University Key Laboratory for the Analysis and Application of Industry Big Data, China , in part by Fujian Key Lab of Agriculture IOT Application, China ; and in part by IOT Application Engineering Research Center of Fujian Province Colleges and Universities, China .

Database:Compendex

Accession number:20215011322429

Title:Progress in Study and Application of Optical Field Modulation Technology Based on Liquid Crystal Spatial Light Modulators (Invited)

Title of translation:基于液晶空间光调制器的光场调控技术及应用进展(特邀)

Authors:Zhou, Yuan (1, 2); Li, Runze (1); Yu, Xianghua (1); Yan, Shaohui (1); Li, Xing (1, 2); Gao, Wenyu (1, 2); Liu, Chao (1, 2); Peng, Tong (1); Yang, Yanlong (1); Min, Junwei (1); Wang, Ping (1, 3); Qu, Jun (4); Yao, Baoli (1, 2)

Corresponding authors:Yao, Baoli(yaobl@opt.ac.cn); Yao, Baoli(yaobl@opt.ac.cn)

Source title:Guangzi Xuebao/Acta Photonica Sinica

Abbreviated source title:Guangzi Xuebao

Volume:50

Issue:11

Issue date:November 25, 2021

Publication year:2021

Article number:1123001

Language:Chinese

ISSN:10044213

CODEN:GUXUED

Document type:Journal article (JA)

Publisher:Chinese Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">As an electromagnetic wave, optical field can be described by using parameters of amplitude, phase and polarization. Spatial optical field modulation technology enables to generate novel spatially structured optical field by modulating these parameters. Compared with other types of modulation devices, the liquid crystal spatial light modulator has the advantages of high diffraction efficiency, millions of modulated pixels, and real-time dynamic modulation. It has become the mainstream device for spatial optical field modulation. In this paper, we first give an introduction to the principles and algorithms of optical field modulation technology, including single-parameter modulation, complex amplitude modulation, and multi-parameter modulation by using the liquid crystal spatial light modulators. Some applications of these optical modulation technologies in holographic optical tweezers, optical microscopy, optical information storage, optical micromachining, imaging behind scattering media, and optical communication are exampled. Then we discuss the problems to be resolved, the development trends and the development prospects of the technology. The purpose of this paper is to help researchers systematically understand the principle, the latest research progress and the potential application of the optical field modulation technology based on the liquid crystal spatial light modulators, and provide some references for research in this field.<br/></div> © 2021, Science Press. All right reserved.

Number of references:191

Main heading:Light modulation

Controlled terms:Liquid crystals - Holograms - Optical signal processing - Optical communication - Optical tweezers - Electromagnetic waves - Frequency domain analysis - Light modulators

Uncontrolled terms:Computergenerated holograms (CGH) - Fourier holograms - Liquid crystal spatial light modulators - Optical field modulation in the spatial domain - Optical field modulation in the spatial frequency domain - Optical field modulations

Classification code:711 Electromagnetic Waves - 717.1 Optical Communication Systems - 741.1 Light/Optics - 743 Holography - 744.9 Laser Applications - 921.3 Mathematical Transformations

DOI:10.3788/gzxb20215011.1123001

Funding details: Number: 11704405,11974417,61975233,81427802, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2018YFE0128300, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;Number: 2020SF-193, Acronym: -, Sponsor: Shanxi Provincial Key Research and Development Project;

Funding text:National Natural Science Foundation of China (Nos.11704405, 81427802, 61975233, 11974417), National Key Research and Development Project (No. 2018YFE0128300), Key Research and Development Program of Shaanxi Province (No. 2020SF-193)

Database:Compendex

Accession number:20211210123389

Title:Trapping performance of holographic optical tweezers generated with different hologram algorithms (Open Access)

Authors:He, M.R. (1, 2); Liang, Y.S. (3); Bianco, P.R. (4); Wang, Z.J. (3); Yun, X. (3); Cai, Y.N. (1); Feng, K. (3); Lei, M. (2, 3)

Corresponding author:Lei, M.(ming.lei@mail.xjtu.edu.cn)

Source title:AIP Advances

Abbreviated source title:AIP Adv.

Volume:11

Issue:3

Issue date:March 1, 2021

Publication year:2021

Article number:035130

Language:English

E-ISSN:21583226

Document type:Journal article (JA)

Publisher:American Institute of Physics Inc.

Abstract:Quantitative measurement of small forces and small displacement using holographic optical tweezers (HOTs) is finding increasing applications due to the features of non-contact and high accuracy manipulation. Although hologram optimization algorithms have been widely reported, the holographic optical trapping performance relying on the algorithms has not been studied systematically. In this paper, we investigated the force measuring the performance of various types of HOTs generated with six different hologram algorithms (GSW, GAA, GS, SR, S, and RM). To do this, we built up a HOT instrument and compared the light fields' intensity distribution, trap stiffness, efficiency, and calculation time of multi-point trap arrays generated by six hologram algorithms with this setup. Our work will provide a better understanding of the performance of different hologram algorithms in HOTs.<br/> © 2021 Author(s).

Number of references:39

Main heading:Holograms

Controlled terms:Optical tweezers - Lithography

Uncontrolled terms:Calculation time - Holographic optical tweezers - Intensity distribution - Opticaltrapping - Optimization algorithms - Quantitative measurement - Small displacement - Trap stiffness

Classification code:743 Holography - 744.9 Laser Applications

DOI:10.1063/5.0033186

Funding details: Number: GM100156, Acronym: NIH, Sponsor: National Institutes of Health;Number: 61905189,62005208, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2019M663656,2020M673365, Acronym: -, Sponsor: China Postdoctoral Science Foundation;Number: 2017YFC0110100, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Funding text:This work was supported by the Natural Science Foundation of China (NSFC) (Grant Nos. 61905189 and 62005208), the China Postdoctoral Science Foundation (Grant Nos. 2019M663656 and 2020M673365), the National Key Research and Development Program of China (Grant No. 2017YFC0110100), and the National Institutes of Health Grant (Grant No. GM100156).

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20212910654389

Title:High sensitivity FBG humidity sensor coated with graphene and polyimide films

Authors:Li, Ziwan (1, 2); Dong, Bo (3); Chen, Enqing (1, 2); Li, Yang (1, 2); Zhao, Wei (1, 2); Wang, Yishan (1, 2); Gao, Cunxiao (1, 2)

Corresponding author:Dong, Bo(dongbo@sztu.edu.cn)

Source title:Optical Fiber Technology

Abbreviated source title:Opt. Fiber Technol.

Volume:66

Issue date:October 2021

Publication year:2021

Article number:102635

Language:English

ISSN:10685200

CODEN:OFTEFV

Document type:Journal article (JA)

Publisher:Academic Press Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">A high sensitivity FBG humidity sensor coated with polyimide and graphene films is proposed. The sensing probe is based on a fiber Bragg grating coated with an inner polyimide film and an outer graphene film. The sensor shows the high humidity sensitivity and experimental results show that its sensitivity is 1.80 times that of the sensor coated with only polyimide film. Within the humidity range of 30%–70%RH, its sensitivity reaches 19.8 pm/%RH and is almost 25 times that of the other lower sensitivity FBG humidity sensor.<br/></div> © 2021 Elsevier Inc.

Number of references:22

Main heading:Polyimides

Controlled terms:Graphene - Humidity sensors - Fiber Bragg gratings

Uncontrolled terms:Graphene films - High humidity - High sensitivity - Polyimide film - Sensing probe

Classification code:443.2 Meteorological Instrumentation - 761 Nanotechnology - 804 Chemical Products Generally - 815.1.1 Organic Polymers

DOI:10.1016/j.yofte.2021.102635

Funding details: Number: 61875227, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: Y829321213, Acronym: CAS, Sponsor: Chinese Academy of Sciences;

Funding text:This work is supported in part by the Chinese Academy of Sciences Pioneer Hundred Talents Program (No. Y829321213 ) and the National Natural Science Foundation of China (No. 61875227 ).

Database:Compendex

Accession number:20212410482956

Title:Small-size streak tube with high edge spatial resolution

Authors:Tian, Liping (1); Shen, Lingbin (1); Li, Lili (2); Wang, Xing (2); Chen, Ping (2); Wang, Junfeng (2); Chen, Lin (1); Zhao, Wei (2); Tian, Jinshou (2)

Author affiliation:(1) School of Network and Communication Engineering, Jinling Institute of Technology, Nanjing; 211169, China; (2) State Key Laboratory of Transient Optics and Photonics, Key Laboratory of Ultra-fast Photoelectric Diagnostics Technology, Xi'an Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences (CAS), Xi'an; 710119, China

Corresponding author:Tian, Liping(tianliping@jit.edu.cn)

Source title:Optik

Abbreviated source title:Optik

Volume:242

Issue date:September 2021

Publication year:2021

Article number:166791

Language:English

ISSN:00304026

Document type:Journal article (JA)

Publisher:Elsevier GmbH

Abstract:<div data-language="eng" data-ev-field="abstract">A small-size streak tube with high spatial resolution over the entire working area is designed, manufactured and tested. The streak tube adopts curved photocathode and curved screen to improve the spatial resolution, especially at the edge area by decreasing the aberration. An accelerating slit electrode, instead of a mesh which limits the luminance gain of the tube, is employed next to the photocathode to improve the electrical resistance, reliability and the temporal resolution by increasing the electron acceleration field. The results in the numerical simulations show that the spatial resolution is 29 lp/mm @ MTF = 10 % over the whole effective photocathode area. The tested results show that the small-size streak tube can offer static spatial resolution as high as 20 lp/mm over the whole effective area. And, the maximum point of the static spatial resolution 25 lp/mm, is deviated away from the center of the photocathode. The experiment results indicate that the spatial resolution is higher than 23.4 lp/mm @ MTF = 10 %. The luminance gain can reach to 39.4 and the dimension of the streak tube is only Φ40 mm × 140 mm. Comparing with 5200 streak tube_XIOPM, we demonstrated that this small-size streak tube in our design not only possesses the compact size, but also obtain a much larger effective working area and much higher luminance gain.<br/></div> © 2021 Elsevier GmbH

Number of references:16

Main heading:Luminance

Controlled terms:Streak cameras - Image resolution - Photocathodes

Uncontrolled terms:42.79. - 85.60. - Bt - Ha - Ls - Luminance gain - Small-size streak tube - Spatial resolution - Temporal resolution

Classification code:714.1 Electron Tubes - 741.3 Optical Devices and Systems - 742.2 Photographic Equipment

Numerical data indexing:Percentage 1.00E+01%, Size 1.40E-01m

DOI:10.1016/j.ijleo.2021.166791

Funding details: Number: GJJSTD20190004, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: BK20190112, Acronym: -, Sponsor: Natural Science Foundation of Jiangsu Province;Number: SKLST202012, Acronym: SKLTOP, Sponsor: State Key Laboratory of Transient Optics and Photonics;Number: jit-b-201814,jit-b-202012, Acronym: JIT, Sponsor: Jinling Institute of Technology;

Funding text:This work is supported by the Scientific Instrument Developing Project of the Chinese Academy of Sciences (Grant No. GJJSTD20190004 ), the Jinling Institute of Technology (Grant No. jit-b-202012 and No. jit-b-201814 ), the Natural Science Foundation of Jiangsu Province, China (Grant No. BK20190112 ), State Key Laboratory of Transient Optics and Photonics Technology 2020 open project (Grant No. SKLST202012 ).

Database:Compendex

Accession number:20212510524259

Title:Optical vortex lattice: An exploitation of orbital angular momentum (Open Access)

Authors:Zhu, Liuhao (1, 2); Tang, Miaomiao (1); Li, Hehe (1); Tai, Yuping (3); Li, Xinzhong (1, 2)

Author affiliation:(1) School of Physics and Engineering, Henan University of Science and Technology, Luoyang; 471023, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China; (3) School of Chemical Engineering and Pharmaceutics, Henan University of Science and Technology, Luoyang; 471023, China

Corresponding author:Li, Xinzhong(xzli@haust.edu.cn)

Source title:Nanophotonics

Abbreviated source title:Nanophotonics

Volume:10

Issue:9

Issue date:July 1, 2021

Publication year:2021

Pages:2487-2496

Language:English

E-ISSN:21928614

Document type:Journal article (JA)

Publisher:De Gruyter Open Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">Generally, an optical vortex lattice (OVL) is generated via the superposition of two specific vortex beams. Thus far, OVL has been successfully employed to trap atoms via the dark cores. The topological charge (TC) on each optical vortex (OV) in the lattice is only ±1. Consequently, the orbital angular momentum (OAM) on the lattice is ignored. To expand the potential applications, it is necessary to rediscover and exploit OAM. Here we propose a novel high-order OVL (HO-OVL) that combines the phase multiplication and the arbitrary mode-controllable techniques. TC on each OV in the lattice is up to 51, which generates sufficient OAM to manipulate microparticles. Thereafter, the entire lattice can be modulated to desirable arbitrary modes. Finally, yeast cells are trapped and rotated by the proposed HO-OVL. To the best of our knowledge, this is the first realization of the complex motion of microparticles via OVL. Thus, this work successfully exploits OAM on OVL, thereby revealing potential applications in particle manipulation and optical tweezers.<br/></div> © 2021 Liuhao Zhu et al., published by De Gruyter, Berlin/Boston 2021.

Number of references:41

Main heading:Optical tweezers

Controlled terms:Vortex flow - Crystal lattices - Optical lattices - Angular momentum - Physical optics

Uncontrolled terms:Complex motion - High-order - Micro-particles - Optical vortices - Orbital angular momentum - Particle manipulation - Topological charges - Vortex beams

Classification code:631.1 Fluid Flow, General - 741.1 Light/Optics - 744.8 Laser Beam Interactions - 744.9 Laser Applications - 933.1.1 Crystal Lattice

DOI:10.1515/nanoph-2021-0139

Funding text:Research funding: National Natural Science Foundation of China (Nos. 11974102, 11704098, 11974101), State Key Laboratory of Transient Optics and Photonics (No. SKLST201901), and Key Scientific Research Projects of Institutions of Higher Learning of Henan Province Education Department (No. 21zx002).

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20214111012348

Title:Equal spacing control of particle via cycloidal beam (Invited)

Title of translation:摆线光束的微粒等间距操控(特邀)

Authors:Zhu, Liuhao (1); Qin, Xueyun (1); Tai, Yuping (3); Li, Xinzhong (1, 2)

Author affiliation:(1) School of Physics and Engineering, Henan University of Science and Technology, Luoyang; 471023, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China; (3) School of Chemical Engineering and Pharmaceutics, Henan University of Science and Technology, Luoyang; 471023, China

Corresponding authors:Li, Xinzhong(xzli@haust.edu.cn); Li, Xinzhong(xzli@haust.edu.cn)

Source title:Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering

Abbreviated source title:Hongwai yu Jiguang Gongcheng Infrared Laser Eng.

Volume:50

Issue:9

Issue date:September 25, 2021

Publication year:2021

Article number:20210380

Language:Chinese

ISSN:10072276

Document type:Journal article (JA)

Publisher:Chinese Society of Astronautics

Abstract:<div data-language="eng" data-ev-field="abstract">The discovery of orbital angular momentum (OAM) opens up a new way for the study of optical tweezers. However, the size and shape of biological cells cannot be exactly the same, when the beam with OAM manipulates the particles. So, the uneven velocity of the particles will lead to uncontrollable spacing between the particles when it carries out operations such as rotation. To solve the problem, a cycloid beam with rich regulation modes was proposed by using an arbitrary curve shaping technique and adding curvature control parameters to the traditional cycloid formula. The OAM and gradient force of the cycloid beam was theoretically analyzed, and the possibility of solving the problem was theoretically analyzed. Finally, the start and stop of particles in the process of motion were realized in the experiment, and the three particles were successfully manipulated to rotate at the same distance. The experimental results show that the error of the distance variation of the three particles during the whole rotation process can be maintained at the nanometer level. The work paves the way for future applications of light to capture and manipulate a variety of particles in other fields, particularly in the biological sciences.<br/></div> © 2021, Editorial Board of Journal of Infrared and Laser Engineering. All right reserved.

Number of references:22

Main heading:Optical tweezers

Controlled terms:Light - Light modulation - Physical optics

Uncontrolled terms:All optical - All-optical tweezer - Biological cells - Computational holography - Control parameters - Momentum force - Orbital angular momentum - Shaping techniques - Size and shape - Spatial light modulation

Classification code:741.1 Light/Optics - 744.9 Laser Applications

DOI:10.3788/IRLA20210380

Database:Compendex

Accession number:20215011309085

Title:Synchronous detection of heavy metal ions in aqueous solution by gold nanoparticle surface-enhanced laser-induced breakdown spectroscopy

Authors:Yao, Yaqian (1, 2); He, Fan (1, 2); Lin, Qingyu (3); Tian, Yonghui (2, 4); Zhang, Tianlong (4); Xu, Boping (5); Qi, Xinyuan (1); Duan, Yixiang (2, 4)

Author affiliation:(1) Department of Physics, Northwest University, Xi'an; Shaanxi; 710069, China; (2) Research Center of Analytical Instrumentation, Northwest University, 1 Xuefu Ave, Xi'an; Shaanxi; 710075, China; (3) Research Center of Analytical Instrumentation, Sichuan University, Chengdu; 610064, China; (4) Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an; Shaanxi; 710069, China; (5) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China

Corresponding author:Duan, Yixiang(yduan@nwu.edu.cn)

Source title:Journal of Analytical Atomic Spectrometry

Abbreviated source title:J Anal At Spectrom

Volume:36

Issue:12

Issue date:December 2021

Publication year:2021

Pages:2639-2648

Language:English

ISSN:02679477

E-ISSN:13645544

CODEN:JASPE2

Document type:Journal article (JA)

Publisher:Royal Society of Chemistry

Abstract:<div data-language="eng" data-ev-field="abstract">Heavy metal ion-induced water pollution has become a severe environmental problem in the world. Although providing a powerful technique for multi-element detection, laser-induced breakdown spectroscopy (LIBS) suffers from insufficient sensitivity for detecting heavy metal ions in aqueous solution due to water splashing and surface ripples. In this work, a simple and sensitive method called gold nanoparticle (AuNP) surface-enhanced laser-induced breakdown spectroscopy (SELIBS) was proposed to detect trace or ultra-Trace heavy metal ions in aqueous solutions using a portable instrument. Firstly, the coulombic force allows the adhesion of negatively charged AuNPs and cationic amphiphilic solutions to capture heavy ions, thereby directly improving signal intensity. Interestingly, AuNP size-dependent signal enhancement was found in heavy metal ions through LIBS. To be specific, the signal intensity of Cu, Pb, and Cr increased by 9, 23, and 26 times, respectively, under the optimal AuNP size with a diameter of 13 nm compared to that of the pure target solution. Although the sizes of AuNPs did not affect the plasma temperature and electron density, the local electric field and coulombic force effectively enhanced the LIBS signal. Under optimized experimental conditions, the proposed method achieves sensitive detection of heavy metal ions of Cu, Pb, and Cr with low detection limits (LODs) of 5 ng mL-1, 22 ng mL-1, and 9 ng mL-1, respectively. Moreover, the recoveries of all analytical elements in environmental water samples were analyzed by the standard addition method. The recoveries were in the range of 92.70-100.19%, which further proves the feasibility and potential of surface-enhanced laser-induced breakdown spectroscopy of AuNPs in analyzing actual liquid samples. This journal is<br/></div> © The Royal Society of Chemistry.

Number of references:44

Main heading:Gold nanoparticles

Controlled terms:Electric fields - Heavy metals - Water pollution - Metal ions - Laser induced breakdown spectroscopy - Solutions - Atomic emission spectroscopy - Metal nanoparticles - Trace elements - Water treatment

Uncontrolled terms:Coulombic forces - Elements detection - Environmental problems - Heavy metal ion - Multielements - Sensitive method - Signal intensities - SIMPLE method - Surface ripples - Synchronous detection

Classification code:445.1 Water Treatment Techniques - 453 Water Pollution - 531 Metallurgy and Metallography - 531.1 Metallurgy - 701.1 Electricity: Basic Concepts and Phenomena - 761 Nanotechnology - 931.1 Mechanics

Numerical data indexing:Mass density 2.20E-05kg/m3, Mass density 5.00E-06kg/m3, Mass density 9.00E-06kg/m3, Percentage 9.27E+01% to 1.0019E+02%, Size 1.30E-08m

DOI:10.1039/d1ja00310k

Database:Compendex

Accession number:20211710242449

Title:Dispersed pulses created by aperiodic binary spectral phase jump and applications for pulse shaping (Open Access)

Authors:Liu, Xin (1, 2); Wang, Hushan (1, 2); Cao, Huabao (1, 2, 3); Yuan, Hao (1, 2); Huang, Pei (1); Wang, Yishan (1, 2); Zhao, Wei (1, 2); Fu, Yuxi (1, 2)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; Shaanxi; 710119, China; (2) University of Chinese Academy of Science, Beijing; 100049, China; (3) ELI-ALPS, ELI-HU Non-Profit Ltd., Wolfgang Sandner u. 3, Szeged; 6728, Hungary

Source title:Optics Express

Abbreviated source title:Opt. Express

Volume:29

Issue:8

Issue date:April 12, 2021

Publication year:2021

Pages:12319-12329

Language:English

E-ISSN:10944087

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">Inspired by pulse-pair generation with periodic phase jump, the generation of dispersed pulses with aperiodic binary spectral phase jump (ABSPJ) is proposed and theoretically investigated. It is presented by the numerical simulations that two dispersed pulses can be generated by ABSPJ of π. The dispersion of one pulse is opposite to the other and can be tuned freely with engineering of the phase jump. The generated dispersed pulse-pair is potentially of great interest for various applications, such as two-dimensional spectroscopy, double pulses laser-wakefield acceleration (LWFA) and chirp management in dual-chirped optical parametric amplification (DC-OPA) system to generate TW single-cycle mid-infrared (MIR) pulses. Furthermore, a pulse shaper configured as a micro-electro-mechanical systems (MEMS) located at the Fourier plane of a 4-f dispersion-free compressor is suggested and the implementation in a high repetition optical parametric chirped pulse amplification (OPCPA) system with picosecond pump has been numerically studied. The simulations showed that MEMS of 900 pixels is enough to pre-compensate TOD of 200000 fs<sup>3</sup> for a pulse of 20 fs. Because pixel with only two piston-levels is necessary for such MEMS, the pulse shaper is expected to be compact and reliable.<br/></div> © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Number of references:48

Main heading:Pixels

Controlled terms:MEMS - Optical parametric amplifiers - Optical pumping - Optical pulse shaping

Uncontrolled terms:Chirp management - Fourier planes - High repetition - Laser wakefield acceleration - Micro electromechanical system (MEMS) - Optical parametric amplification - Optical parametric chirped-pulse amplification - Single cycle

Classification code:704.2 Electric Equipment - 713.4 Pulse Circuits - 714 Electronic Components and Tubes

Numerical data indexing:Time 2.00e-14s

DOI:10.1364/OE.419450

Funding details: Number: GINOP 2.3.6-15-2015-00001, Acronym: -, Sponsor: -;Number: S19-020-III, Acronym: -, Sponsor: -;Number: 202005YK01, Acronym: -, Sponsor: -;Number: -, Acronym: EC, Sponsor: European Commission;Number: 61690222,XAB2019B25, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: J20-021-III, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: -, Acronym: ERDF, Sponsor: European Regional Development Fund;Number: 2019JCW-03, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;

Funding text:Acknowledgments. Huabao Cao acknowledges fruitful discussions with Mikhail Kalashnikov and Roland Nagymi-haly from ELI-ALPS. The ELI-ALPS project (GINOP-2.3.6-15-2015-00001) is supported by the European Union and co-financed by the European Regional Development Fund.Funding. Science and Technology Program of Xi’an (No. 202005YK01); Natural Science Basic Research Program of Shaanxi Province (No. 2019JCW-03); Key Deployment Research Program of XIOPM (No. S19-020-III); Major Science and Technology Infrastructure Pre-research Program of the CAS (No. J20-021-III); National Natural Science Foundation of China (No. 61690222); Light of West China Program (XAB2019B25); ELI-ALPS (GINOP 2.3.6-15-2015-00001).

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20220911713137

Title:Properties of Optical Vortex Lattice Generated via Multiple Plane Wave Interference

Title of translation:多平面波干涉的光学涡旋晶格特性研究

Authors:Qin, Xueyun (1, 2); Zhu, Liuhao (1); Tai, Yuping (3); Tang, Jie (2); Li, Xinzhong (1, 2)

Author affiliation:(1) School of Physics and Engineering, Henan University of Science and Technology, Luoyang; 471023, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) School of Chemical Engineering and Pharmaceutics, Henan University of Science and Technology, Luoyang; 471023, China

Corresponding authors:Li, Xinzhong(xzli@haust.edu.cn); Li, Xinzhong(xzli@haust.edu.cn)

Source title:Guangxue Xuebao/Acta Optica Sinica

Abbreviated source title:Guangxue Xuebao

Volume:41

Issue:21

Issue date:November 10, 2021

Publication year:2021

Article number:2126001

Language:Chinese

ISSN:02532239

CODEN:GUXUDC

Document type:Journal article (JA)

Publisher:Chinese Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">Multiple plane wave interference (MPWI) is a typical method to produce an optical vortex lattice (OVL). In this letter, via defining the wave vector space coordinate system, a modulating method of OVL with MPWI is proposed, the OVLs generated by four plane wave and five plane wave interference are simulated, the gradient force and energy flow of the OVL are calculated, and its application in the field of particle manipulation is analyzed. Accordingly, a more flexible and richer optical field distribution is obtained via adjusting the size of the partial wave vector and the angle of the rotation wave vector. Finally, by analyzing the gradient force and energy flow, it is found that the light field with a specific purpose can be generated by this method when manipulating particles. This study enriches the diversity of modes of OVL generated by MPWI and provides a novel idea for the study of OVL based on MPWI.<br/></div> © 2021, Chinese Lasers Press. All right reserved.

Number of references:30

Main heading:Physical optics

Controlled terms:Particle size analysis - Optical lattices - Vector spaces - Elastic waves - Crystal lattices - Wave propagation - Vortex flow

Uncontrolled terms:Energy flow - Forces flow - Gradient energy - Gradient force - Multiple plane wave interference - Optical vortex lattice - Optical- - Particle manipulation - Plane wave - Wave vector

Classification code:631.1 Fluid Flow, General - 741.1 Light/Optics - 744.8 Laser Beam Interactions - 921 Mathematics - 931.1 Mechanics - 933.1.1 Crystal Lattice - 951 Materials Science

DOI:10.3788/AOS202141.2126001

Database:Compendex

Accession number:20213510824261

Title:Development of High-Power Ultrafast Fiber Laser Technology

Title of translation:高功率超快光纤激光技术发展研究

Authors:Liu, Yizhou (1); Qiao, Wenchao (1); Gao, Kong (1, 2); Xu, Rong (1); Feng, Tianli (1, 2); Zhang, Meng (1); Li, Xun (3); Liang, Yangyang (1, 2); Li, Tao (1, 2)

Author affiliation:(1) Laser Physics and Technology Laboratory, School of Information Science and Engineering, Shandong University, Qingdao; 266237, China; (2) China Key Laboratory of Laser & Infrared System (Shandong University), Ministry of Education, Qingdao; 266237, China; (3) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China

Corresponding author:Li, Tao(litao@sdu.edu.cn)

Source title:Zhongguo Jiguang/Chinese Journal of Lasers

Abbreviated source title:Zhongguo Jiguang

Volume:48

Issue:12

Issue date:June 25, 2021

Publication year:2021

Article number:1201003

Language:Chinese

ISSN:02587025

CODEN:ZHJIDO

Document type:Journal article (JA)

Publisher:Science Press

Abstract:<div data-language="eng" data-ev-field="abstract">Significance: In 1960, after the invention of the first ruby laser, fast-developed solid-state, fiber, gas, and semiconductor lasers provided great support for the research and development of multiple applications, such as optical communication, industrial processing and manufacturing, military and national defense, and state-of-the-art scientific research. Fiber lasers with good heat dissipation characteristics, excellent transverse mode, high amplification efficiency, compact laser construction, and less costs have become the first choice in developing next generation high-power ultrafast lasers. Fiber lasers can achieve long-term operation stability with good beam quality under above-average power because of their waveguide characteristics and large specific gain fiber surface area. High-power ultrafast fiber lasers usually contain four modules, ultrafast fiber oscillators, optical parameters management, ultrafast fiber amplifiers, and nonlinear compression. Ultrafast fiber oscillators provide seed lasers to achieve high-power ultrafast fiber lasers. A qualified mode-locked fiber oscillator has long-term stability and a proportional repetition shared rate corresponding to the requirements of high-power fiber amplifications. Optical parameters management plays a key role in inhibiting uncompensated nonlinear effects and enabling high-energy pulse output with good pulse quality after optical pulse stretching, high power fiber amplification, and optical pulse compression. The ultrafast fiber amplifiers are key modules to scale up the average power of the stretched-signal pulses. Unfortunately, the uncompensated nonlinear phase introduced by the high-peak power of the signal pulse distorts the pulse profile during its propagation in the fiber system. Based on the well-managed optical parameters of fiber lasers, the well-known fiber amplification methods, such as chirped-pulse, divided-pulse, and pre-chirp managed amplifications are making a significant breakthrough in achieving high-power ultrafast fiber lasers. The pulse duration after high-power fiber amplification is hundreds of femtoseconds limited by the gain-narrowing effect. Therefore, a further cascaded nonlinear compression stage is needed for shortening the amplified pulses, which can realize single/few optical cycle pulse duration to fulfill the requirements of the state-of-the-art physical experiments. With their excellent optical characteristics, the fast-developing high-power fiber lasers can play an increasingly important role in multiple applications. Progress Progress in developing ultrafast fiber oscillators, optical parameters management, ultrafast fiber amplifiers, and nonlinear compression are summarized in this paper, and latest published results are discussed by illustrating the advantages and disadvantages of different methods. The highest repetition rate of fiber oscillators reported using the method of nonlinear polarization rotation is 1 GHz provided to be useful in astronomical optical frequency comb, pulse stacking, and the cavity-enhanced high harmonic generation. The highest average output power and pulse energies are 1.98 W and 684 nJ, which are achieved with the nonlinear loop mirror mode-locking scheme, respectively. Applying a semiconductor saturable absorber mirror to the mode-locked fiber laser can generate an output mode-locked laser with the repetition rate range of 10 kHz1 GHz and sub-μJ pulse energy. As a newly invented mode-locked method, Mamyshev mode-locked fiber laser has attracted attention for its broadband optical spectrum, high-pulse energy output, and high-peak power. As the seeder for a high-power ultrafast fiber laser system, further efforts need to be taken in developing a more stable fiber oscillator with better parameters. Relying on optical parameter management, current ultrafast fiber amplifiers are realized with different amplification methods, such as chirped-pulse, divided-pulse, and pre-chirp managed amplifications. The highest average output power of 830 W at 1 μm was reported by applying the chirped-pulse amplification. Limited by the transverse mode instability and thermal damage threshold, there is one research direction for further improvement that can be realized by searching for new gain materials with better optical performances. Combining the chirped-pulse and multi-channel divided-pulse amplifications, the highest average output power of 10.4 kW was obtained in a 12-channel fiber laser amplifier. 36 fs mode-locked pulses with 100 W average power were achieved with the method of pre-chirp managed amplification, avoiding adding a cascaded nonlinear compression stage. Apart from the aforementioned amplification methods, coherent pulse stacking method is also an efficient way in realizing ultrafast fiber laser with high-pulse energy. Pulse energy of 10 mJ was achieved with the coherent pulse stacking based on the high-power ultrafast fiber laser source. It is difficult to realize sub-100 fs or even shorter pulse durations in a high-power fiber chirped pulse amplification system due to the gain-narrowing effect. Therefore, a further nonlinear compression stage is necessary to satisfying the state-of-the-art applications, requiring short pulse duration. Multipass cells with quartz sheet/noble gas and noble-gas-filled hollow-core fibers are two common constructions in building the nonlinear compression stage, which are illustrated in the nonlinear compression section of this paper. The pulse duration can be compressed to 22 fs, and a pulse energy of 15.6 μJ was realized in the multipass cell construction. Using the noble-gas-filled hollow-core fibers, pulse duration was shortened to approximately 4.3 fs corresponding to a 1.6 optical cycle with a pulse energy of 1 mJ. Conclusions and Prospect In this paper, the high-power ultrafast fiber laser systems are introduced. Research and development status of high-power ultrafast fiber lasers are illustrated along with introducing principles and internal relations of four fundamental modules of ultrafast fiber oscillators, optical parameters management, ultrafast fiber amplifiers, and nonlinear compression. Depending on the fast-developing requirements from multiple state-of-the-art applications, more efforts need to be taken. Further research directions in developing high-power ultrafast fiber lasers have prospected. One promising way is investigating new fiber materials with promising better optical parameters compared to fused silica. Further, making contributions in developing the aforementioned fiber amplification methods is also an efficient way in developing fiber lasers with above-average power, higher-pulse energy, and shorter pulse duration. Newly designed optical fiber amplification methods still need to be invented by carefully considering the optical characteristics of fiber gain material and theoretical nonlinear optical conditions. High-power ultrafast fiber lasers can play a key role in multiple state-of-the-art applications relying on the development of searching for more functional fiber gain materials, optimizing aforementioned amplification techniques, and inventing new methods in amplifying high-power ultrafast fiber lasers.<br/></div> © 2021, Chinese Lasers Press. All right reserved.

Number of references:129

Main heading:Fiber lasers

Controlled terms:Semiconductor lasers - Fibers - Military applications - Amplification - Industrial research - Fiber amplifiers - Laser applications - High power lasers - Ultrafast lasers - Nonlinear optics

Uncontrolled terms:Amplification efficiencies - Chirped pulse amplification systems - Chirped pulse amplifications - High harmonic generation - Long-term operation stabilities - Nonlinear polarization rotation - Research and development - Ultrafast fiber amplifiers

Classification code:404.1 Military Engineering - 741.1.1 Nonlinear Optics - 744.1 Lasers, General - 744.4 Solid State Lasers - 744.4.1 Semiconductor Lasers - 744.9 Laser Applications - 901.3 Engineering Research - 912.1 Industrial Engineering

Numerical data indexing:Energy 1.00e-02J, Energy 1.00e-03J, Energy 1.56e-05J, Energy 6.84e-07J, Frequency 1.00e+09Hz, Power 1.00e+02W, Power 1.04e+04W, Power 1.98e+00W, Power 8.30e+02W, Size 1.00e-06m, Time 2.20e-14s, Time 3.60e-14s, Time 4.30e-15s

DOI:10.3788/CJL202148.1201003

Database:Compendex

Accession number:20211010057464

Title:Excitation of high-quality orbital angular momentum vortex beams in an adiabatically helical-twisted single-mode fiber (Open Access)

Authors:Ren, Kaili (1, 2); Ren, Liyong (2, 3); Liang, Jian (2, 3); Yang, Li (4); Xu, Jie (1); Han, Dongdong (1); Wang, Yongkai (1, 3); Liu, Jihong (1); Dong, Jun (1); He, Hanyu (1); Zhang, Wenfei (2, 5)

Author affiliation:(1) School of Electronic Engineering, Xi'an University of Posts and Telecommunications, Xi'an; 710121, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) School of Physics and Information Technology, Shaanxi Normal University, Xi'an; 710119, China; (4) Department of Electronic Engineering and Information Science, University of Science and Technology of China, Hefei, Anhui; 230027, China; (5) Collaborative Innovation Center of Light Manipulations and Applications, Shandong Normal University, Jinan; 250358, China

Source title:Optics Express

Abbreviated source title:Opt. Express

Volume:29

Issue:6

Issue date:March 15, 2021

Publication year:2021

Pages:8441-8450

Language:English

E-ISSN:10944087

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:A novel method to control the parameters of a chiral fiber grating structure is proposed. Mode couplings are controlled in real time during the twisting fabrication process. This chiral grating structure can satisfy the phase-matching condition for generating high-quality orbital angular momentum (OAM) beams, with an order mode of conversion efficiency over 99.9%. Both theoretical analysis and experimental results of this OAM mode conversion have been investigated, with good agreement. The results demonstrate a dual-OAM beam converter with a charge of ?}1 for the right- A nd left-handed CLPGs, respectively. The high-quality OAM beam generated in this twisted single-mode fiber process may find excellent applications in optical communications.<br/> © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.

Number of references:48

Main heading:Single mode fibers

Controlled terms:Diffraction gratings - Angular momentum - Phase matching

Uncontrolled terms:Chiral fiber gratings - Fabrication process - Grating structures - High quality - Mode conversions - Mode coupling - Orbital angular momentum - Phase matching conditions

Classification code:713 Electronic Circuits - 741.1.2 Fiber Optics - 741.3 Optical Devices and Systems

Numerical data indexing:Percentage 9.99e+01%

DOI:10.1364/OE.419668

Funding details: Number: -, Acronym: XUPT, Sponsor: Xi'an University of Posts and Telecommunications;

Funding text:Funding. Xi’an University of Posts and Telecommunications (YJGJ201905); Natural Science Foundation of Shaanxi Provincial Department of Education (19JK0807); Natural Science Foundation of Shaanxi Province (2019JQ-862, 2019JQ-864, 2020GY-101, 2020GY-127); National Natural Science Foundation of China (61275086, 61275149, 61875165).

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20210509837138

Title:Localized gap modes of coherently trapped atoms in an optical lattice (Open Access)

Authors:CHEN, ZHIMING (1, 2); ZENG, JIANHUA (3)

Author affiliation:(1) School of Science, East China University of Technology, Nanchang; 330013, China; (2) Collaborative Innovation Center of Light Manipulations and Applications, Shandong Normal University, Jinan; 250358, China; (3) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi'an; 710119, China

Corresponding author:ZENG, JIANHUA(zengjh@opt.ac.cn)

Source title:Optics Express

Abbreviated source title:Opt. Express

Volume:29

Issue:3

Issue date:February 1, 2021

Publication year:2021

Pages:3011-3025

Language:English

E-ISSN:10944087

Document type:Journal article (JA)

Publisher:OSA - The Optical Society

Abstract:We theoretically investigate one-dimensional localized gap modes in a coherent atomic gas where an optical lattice is formed by a pair of counterpropagating far-detuned Stark laser fields. The atomic ensembles under study emerge as Λ-type three-level configuration accompanying the effect of electromagnetically induced transparency (EIT). Based on Maxwell- Bloch equations and the multiple scales method, we derive a nonlinear equation governing the spatial-temporal evolution of the probe-field envelope. We then uncover the formation and properties of optical localized gap modes of two kinds, such as the fundamental gap solitons and dipole gap modes. Furthermore, we confirm the (in)stability regions of both localized gap modes in the respective band-gap spectrum with systematic numerical simulations relying on linear-stability analysis and direct perturbed propagation. The predicted results may enrich the nonlinear horizon to the realm of coherent atomic gases and open up a new door for optical communication and information processing.<br/> © 2021 Optical Society of America.

Number of references:67

Main heading:Optical lattices

Controlled terms:Energy gap - Maxwell equations - Linear stability analysis - Gases - Atoms - Nonlinear equations - Optical communication - Crystal lattices - Optical materials - Optical properties - Nonlinear optics

Uncontrolled terms:Atomic ensemble - Counterpropagating - Electromagnetically-induced transparency - Maxwell-Bloch equation - Multiple scales methods - Spatial-temporal evolution - Stability regions - Trapped atoms

Classification code:701.1 Electricity: Basic Concepts and Phenomena - 701.2 Magnetism: Basic Concepts and Phenomena - 717.1 Optical Communication Systems - 741.1 Light/Optics - 741.1.1 Nonlinear Optics - 741.3 Optical Devices and Systems - 744.8 Laser Beam Interactions - 921 Mathematics - 921.2 Calculus - 931.3 Atomic and Molecular Physics - 933.1.1 Crystal Lattice

DOI:10.1364/OE.412554

Funding details: Number: 11704066,12074063,12074423, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 20202BABL211013, Acronym: -, Sponsor: Natural Science Foundation of Jiangxi Province;

Funding text:Funding. East China University of Technology (DHBK2016118); Natural Science Foundation of Jiangxi Province (20202BABL211013); National Natural Science Foundation of China (11704066, 12074063, 12074423).

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20212510541323

Title:Chirality-Assisted Aharonov-Anandan Geometric-Phase Metasurfaces for Spin-Decoupled Phase Modulation

Authors:Ji, Ruonan (1); Xie, Xin (1); Guo, Xuyue (1); Zhao, Yang (1); Jin, Chuan (2); Song, Kun (1); Wang, Shaowei (3); Yin, Jianbo (1); Liu, Yahong (1); Jiang, Chengming (4); Yang, Chaoshun (1); Zhao, Xiaopeng (1); Lu, Wei (3)

Author affiliation:(1) Smart Materials Lab, School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an; 710129, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China; (3) State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai; 200083, China; (4) School of Mechanical Engineering, Dalian University of Technology, Dalian; 116023, China

Corresponding author:Ji, Ruonan(jiruonan@nwpu.edu.cn)

Source title:ACS Photonics

Abbreviated source title:ACS Photonics

Volume:8

Issue:6

Issue date:June 16, 2021

Publication year:2021

Pages:1847-1855

Language:English

E-ISSN:23304022

Document type:Journal article (JA)

Publisher:American Chemical Society

Abstract:<div data-language="eng" data-ev-field="abstract">In this work, a quasi-nondispersive and spin-decoupled phase modulation strategy was proposed based on the chiral structure. Owing to the spin-dependent response of the chiral structure, the evolution of the Aharonov-Anandan (AA) geometric phase can be controlled by tuning different structural parameters independently. Additionally, the chiral structure was designed nonresonant or weak-resonant to minimize the influence of strong resonant absorption and large dispersive propagation phase shift, leading to an efficiently quasi-nondispersive phase modulation. To prove the validity of the strategy, a series of umbrella-shaped reflection-Type metal-insulator-metal structures were designed as the unit cells and simulated with the finite element method. Moreover, the metasurfaces were designed based on such unit cells to generate broadband orbital angular momentums with different topological charges and spin-switchable holograms, respectively. Simulated and experimental results are in good agreement with the theoretical results. To the best of our knowledge, broadband spin-dependent phase modulation has been achieved without intentionally merging other types of phases for the first time in this work. We believe that this strategy provides a flexible approach for complex spin-or polarization-related applications in optical communication, integrated optics, optical sensing, and other related fields.<br/></div> ©

Number of references:40

Main heading:Geometry

Controlled terms:Metal insulator boundaries - Finite element method - Phase modulation - Optical communication

Uncontrolled terms:Dispersive propagation - Metal-insulator-metal structures - Modulation strategy - Nondispersive phase - Orbital angular momentum - Resonant absorption - Structural parameter - Topological charges

Classification code:717.1 Optical Communication Systems - 921 Mathematics - 921.6 Numerical Methods

DOI:10.1021/acsphotonics.1c00505

Funding details: Number: 11804278,11874301,61601375,61805204, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2019JQ-133,2019JQ-241, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;Number: 310202011qd002, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;

Funding text:This work was partially supported by the National Natural Science Foundation of China (61805204, 61601375, 11874301, 11804278), the Natural Science Basic Research Plan in Shaanxi Province of China (2019JQ-133, 2019JQ-241), and the Fundamental Research Funds for the Central Universities of China (310202011qd002).

Database:Compendex

Accession number:20211410165684

Title:Numerical simulation of dielectric barrier discharge with asymmetrical electrode in atmospheric helium

Authors:Wang, Jing (1, 2); Li, Jing (1, 2); Lei, Bingying (1, 2); Ran, Shuang (1, 2); Xu, Boping (1, 2); Liu, Yinghua (1, 2); Li, Xinzhong (3); Wang, Yishan (1, 2); Tang, Jie (1, 2); Zhao, Wei (1, 2); Duan, Yixiang (4)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) School of Physics and Engineering, Henan University of Science and Technology, Luoyang; 471023, China; (4) Key Laboratory of Synthetic and Natural Functional Molecule Chemistry, Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an; 710127, China

Corresponding author:Tang, Jie(tangjie@opt.ac.cn)

Source title:Plasma Sources Science and Technology

Abbreviated source title:Plasma Sources Sci Technol

Volume:30

Issue:3

Issue date:March 2021

Publication year:2021

Article number:035012

Language:English

ISSN:09630252

E-ISSN:13616595

CODEN:PSTEEU

Document type:Journal article (JA)

Publisher:IOP Publishing Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">The characteristics of the dielectric barrier discharge (DBD) equipped with asymmetrical electrode (ring electrode on the upper and disk electrode on the lower) in atmospheric helium are investigated by a two-dimensional self-consistent fluid model. Simulation results show that as the applied voltage increases, the discharge enhances and the onset of discharge advances, which is similar to the results of traditional DBD. However, with the applied voltage increasing, the symmetry of the discharge current pulses in the positive and negative half cycles disappears because of the asymmetric electrode configuration. In addition, only the spatial distribution of the electron density at the peak moments of the first and second current pulses satisfies the complementary characteristics, while the spatial distribution at other peak moments does not meet the complementary characteristics. Moreover, the electric field, near the upper dielectric barrier surface, presents a curtain-like distribution with considerable radial electric field components, which results from the non-uniform radial surface charge distribution and the ring electrode configuration. The relative variation of the radial distribution of surface charge density is largely determined by the geometry of the opposite electrode.<br/></div> © 2021 IOP Publishing Ltd.

Number of references:37

Main heading:Dielectric barrier discharge

Controlled terms:Electrodes - Dielectric materials - Spatial distribution - Surface charge - Dielectric devices - Flow control - Helium

Uncontrolled terms:Asymmetric electrodes - Atmospheric helium - Complementary characteristics - Dielectric barrier - Dielectric barrier discharges - Discharge current pulse - Radial distributions - Radial electric field

Classification code:405.3 Surveying - 631.1 Fluid Flow, General - 701.1 Electricity: Basic Concepts and Phenomena - 708.1 Dielectric Materials - 731.3 Specific Variables Control - 804 Chemical Products Generally - 902.1 Engineering Graphics - 921 Mathematics

DOI:10.1088/1361-6595/abe613

Database:Compendex

Accession number:20210609886711

Title:Writing nanopores on a ZnS crystal with ultrafast Bessel beams

Title of translation:超快贝塞尔光束在硫化锌晶体表面制备纳米孔

Authors:Chang, Gai-Yan (1, 2); Wang, Yu-Heng (3); Cheng, Guang-Hua (4)

Corresponding author:Cheng, Guang-Hua(guanghuacheng@nwpu.edu.cn)

Source title:Chinese Optics

Abbreviated source title:Chin. Opt.

Volume:14

Issue:1

Issue date:January 2021

Publication year:2021

Pages:213-225

Language:English

ISSN:20971842

Document type:Journal article (JA)

Publisher:Editorial Office of Chinese Optics

Abstract:<div data-language="eng" data-ev-field="abstract">Zinc sulfide (ZnS) crystal is one of the important materials used to make the wide-spectrum infrared window. The ultrafast laser technology for manufacturing the nanopores with high aspect ratio provides an important approach to fabricate the photonic devices such as mid-infrared waveguide Fourier transform spectrometer etc. In this paper, a 40-times-demagnification ultrafast laser direct-writing system was built with a 4f system and a Gaussian-Bessel beam generated by a quartz axicon and a Yb:KGW laser source that operated at a wavelength of 1030 nm, a repetition rate of 100 kHz and a pulse width tunable from 223 fs to 20 ps. When the pulse energy was changed from 36 μJ to 63 μJ and the pulse duration was changed from 12.5 ps to 20 ps, the nanopore structure with a diameter of 80~320 nm was successfully written on the ZnS crystal. The surface morphology, diameter and depth of the nanopores were determined by FIB (Focused Ion Beams) ablation and SEM (Scanning Electron Microscopy) imaging. The influence of laser pulse energy and pulse width on the nanopores was studied. The results show that when the pulse width is 20 ps and the pulse energy is 48 µJ, the depth of a nanopore is about 270 µm.<br/></div> Copyright ©2021 Chinese Optics. All rights reserved.

Number of references:33

Main heading:Scanning electron microscopy

Controlled terms:Aspect ratio - Cadmium sulfide - Fourier transform infrared spectroscopy - Gaussian beams - II-VI semiconductors - Ion beams - Morphology - Nanopores - Optical waveguides - Photonic devices - Pulse repetition rate - Surface morphology - Ultrafast lasers - Zinc oxide

Uncontrolled terms:Bessel beam - Gaussian-bessel beam - Gaussians - High aspect ratio - High aspect ratio nanopore - Photonics devices - Pulse energies - Pulsewidths - Pulswidths - Zinc sulphide crystal

Classification code:711 Electromagnetic Waves - 712.1 Semiconducting Materials - 714.3 Waveguides - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 744.1 Lasers, General - 761 Nanotechnology - 801 Chemistry - 804 Chemical Products Generally - 804.2 Inorganic Compounds - 931.2 Physical Properties of Gases, Liquids and Solids - 932.1 High Energy Physics - 933 Solid State Physics - 951 Materials Science

Numerical data indexing:Energy 3.60E-05J to 6.30E-05J, Frequency 1.00E+05Hz, Size 1.03E-06m, Size 8.00E-08m to 3.20E-07m, Time 1.25E-11s to 2.00E-11s, Time 2.00E-11s, Time 2.23E-13s to 2.00E-11s

DOI:10.37188/CO.2020-0101

Funding details: Number: 61775236, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2018YFB1107401, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Funding text:收稿日期：2020-06-08；修订日期：2020-06-22 基金项目：国家重点研发计划（No. 2018YFB1107401）；国家自然科学基金（No. 61775236）资助项目 Supported by National Key Research and Development Program (No. 2018YFB1107401); National Natural Science Foundation of China (No. 61775236)

Database:Compendex

Accession number:20211410183041

Title:Novel strategy for the enhancement of anti-counterfeiting ability of photochromic ceramics: Sm<sup>3+</sup> doped KSr<inf>2</inf>Nb<inf>5</inf>O<inf>15</inf> textured ceramics with anisotropic luminescence modulation behavior

Authors:Cao, Shuyao (1); Chen, Qian (1); Li, Yangping (1); Wu, Changying (2); Xu, Jie (1); Cheng, Guanghua (2, 3); Gao, Feng (1)

Author affiliation:(1) State Key Laboratory of Solidification Processing, MIIT Key Laboratory of Radiation Detection Materials and Devices, USI Institute of Intelligence Materials and Structure, NPU-QMUL Joint Research Institute of Advanced Materials and Structure, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an; 710072, China; (2) School of Electronics and Information, Northwestern Polytechnical University, Xi'an; Shaanxi; 710072, China; (3) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi'an; Shaanxi; 710119, China

Corresponding author:Gao, Feng(gaofeng@nwpu.edu.cn)

Source title:Journal of the European Ceramic Society

Abbreviated source title:J. Eur. Ceram. Soc.

Volume:41

Issue:9

Issue date:August 2021

Publication year:2021

Pages:4924-4933

Language:English

ISSN:09552219

E-ISSN:1873619X

Document type:Journal article (JA)

Publisher:Elsevier Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">Sm<sup>3+</sup> doped KSr<inf>2</inf>Nb<inf>5</inf>O<inf>15</inf> (KSN-Sm) textured ceramics with anisotropic photochromic and luminescence modulation behaviors provided a new strategy for the enhancement of anti-counterfeiting ability. The KSN-Sm textured ceramics were fabricated by the tape casting technology, which exhibited obvious grain-orientation, with Lotgering factor f<inf>(00l)</inf> of 0.62. The textured sample possessed evident difference of reflectivity, photochromic, luminescent and luminescence modulation properties among various grain-orientated directions. The difference of luminescent emission intensity was over than 30 % and the luminescence modulation ratios &utri;R<inf>t</inf> are 75.3 % and 63.3 % along paralleled and vertical [00l] orientations, respectively. These optical anisotropies were attributed to the different refractive indexes, distributions of photochromic centers and energy transfer rates at various orientations. This work is hopeful to achieve the multidirectional data recording and enhancement of anti-counterfeiting ability of photochromic ceramics by the anisotropic properties of textured ceramics.<br/></div> © 2021 Elsevier Ltd

Number of references:44

Main heading:Anisotropy

Controlled terms:Samarium compounds - Textures - Luminescence - Refractive index - Strontium compounds - Energy transfer - Modulation - Photochromism - Niobium compounds

Uncontrolled terms:Anti-counterfeiting - Emissions intensity - Grain orientation - Luminescence modulation - Luminescent emission - Modulation properties - Novel strategies - Photochromics - Tape casting technology - Textured ceramics

Classification code:741.1 Light/Optics - 931.2 Physical Properties of Gases, Liquids and Solids

Numerical data indexing:Percentage 3.00E+01%, Percentage 6.33E+01%, Percentage 7.53E+01%, Volume 0.00E00m3

DOI:10.1016/j.jeurceramsoc.2021.03.039

Funding details: Number: 51961135301, Acronym: -, Sponsor: -;Number: 2019KW-054,2020KW-032, Acronym: -, Sponsor: -;Number: 51702259,52072301, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 3102019GHJD001,3102019MS0406, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;Number: B20028, Acronym: -, Sponsor: Higher Education Discipline Innovation Project;

Funding text:This work was supported by the China-Poland International Collaboration Fund of National Natural Science Foundation of China (No. 51961135301 ), National Natural Science Foundation of China (No. 51702259 , 52072301 ), the Fundamental Research Funds for the Central Universities (No. 3102019GHJD001 , 3102019MS0406 ), the International Cooperation Foundation of Shaanxi Province (No. 2019KW-054 , 2020KW-032 ), and the "111" Project (No. B20028 ). We would like to thank the Analytical & Testing Center of Northwestern Polytechnical University for the testing of SEM and Raman spectra.

Database:Compendex

Accession number:20210509857634

Title:On-line SERS detection of adenine in DNA based on the optofluidic in-fiber integrated GO/PDDA/Ag NPs

Authors:Gao, Danheng (1); Yang, Xinghua (1); Teng, Pingping (1); Kong, Depeng (2); Liu, Zhihai (1); Yang, Jun (1); Luo, Meng (1); Li, Zhanao (1); Wen, Xingyue (1); Yuan, Libo (1, 3); Li, Kang (4); Bowkett, Mark (4); Copner, Nigel (4); Wang, Xiaozhang (5)

Author affiliation:(1) Key Laboratory of In-Fiber Integrated Optics, Ministry of Education, College of Science, Harbin Engineering University, Harbin; 150001, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanic, Chinese Academy of Sciences, Xi'an; 710119, China; (3) Photonics Research Center, Guilin University of Electronics Technology, Guilin; 541004, China; (4) Wireless & Optoelectronics Research & Innovation Centre, Faculty of Computing, Engineering & Science, University of South Wales, Wales; CF37 1DL, United Kingdom; (5) Xi'an Modern Control Technology Research Institute, Xi'an; 710065, China

Corresponding author:Yang, Xinghua(yangxh@hrbeu.edu.cn)

Source title:Sensors and Actuators, B: Chemical

Abbreviated source title:Sens Actuators, B Chem

Volume:332

Issue date:April 1, 2021

Publication year:2021

Article number:129517

Language:English

ISSN:09254005

CODEN:SABCEB

Document type:Journal article (JA)

Publisher:Elsevier B.V.

Abstract:In this paper, a novel type of in-fiber optofluidic Raman self-assembly graphene oxide (GO)/PDDA/Ag NPs SERS sensor for the adenine in DNA is proposed. The microstructured hollow fiber (MHF) has a channel and a suspended core in microscale, which allows the sample to flow into the fiber. Meanwhile, the GO/PDDA/Ag NPs SERS substrates are modified on the MHF core by chemical bond. When the sample is interacted with the evanescent field excited by the suspended core, the on-line SERS signals can be coupled back to the core and be detected. Here, we carry out on-line optofluidic detection on the adenine samples. The results show that the detection limit (LOD) of the samples of is about 1 × 10<sup>−14</sup> M. The unwound DNA solution extracted from biological blood is injected into the MHF. Under the action of the hydrogen bond between PDDA with adenine, the adenine base in DNA is successfully detected and the interference of guanine, cytosine and thymine is eliminated. Significantly, this work provides an integrated self-assembled GO/PDDA/Ag NPs SERS adenine sensor in an optofluidic fiber. This rapid, convenient and sensitive Raman detection sensor of adenine in DNA is expected to have more potential applications in HIV, genetics and other fields.<br/> © 2021 Elsevier B.V.

Number of references:38

Main heading:DNA

Controlled terms:Microstructure - Graphene - Substrates - Hydrogen bonds - Evanescent fields - Optical fibers

Uncontrolled terms:Detection limits - Detection sensors - DNA solutions - Hollow fiber - In-fiber - Optofluidic - Sers detections - SERS substrate

Classification code:461.2 Biological Materials and Tissue Engineering - 701 Electricity and Magnetism - 741.1.2 Fiber Optics - 761 Nanotechnology - 801.4 Physical Chemistry - 804 Chemical Products Generally - 951 Materials Science

DOI:10.1016/j.snb.2021.129517

Funding details: Number: 2019GY-073, Acronym: -, Sponsor: -;Number: 11574061,61405043, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: F201405,LC2018026, Acronym: -, Sponsor: Natural Science Foundation of Heilongjiang Province;Number: 2018YFC1503703, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;Number: 3072019CF2502, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;

Funding text:National Natural Science Foundation of China (11574061, 61405043); National Key R&D Program of China (2018YFC1503703); Natural Science Foundation of Heilongjiang Province (LC2018026, F201405); Fundamental Research Funds for the Central Universities (3072019CF2502); the Key R&D Program of Shaanxi Province (2019GY-073).

Database:Compendex

Accession number:20214511135998

Title:A New Design of Large-format Streak Tube with Single-lens Focusing System (Open Access)

Authors:Tian, Liping (1, 2); Shen, Lingbin (1); Chen, Lin (1); Li, Lili (2); Tian, Jinshou (2); Chen, Ping (2); Zhao, Wei (2)

Author affiliation:(1) School of network and communication engineering, Jinling Institute of Technology, Hongjing Road, No.99, Nanjing; 211169, China; (2) Key Laboratory of of Transient Optics and Photonics, Key Laboratory of Ultra-fast Photoelectric Diagnostics Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xinxi Road, No.17, Xi'an; 710119, China

Source title:Measurement Science Review

Abbreviated source title:Meas. Sci. Rev.

Volume:21

Issue:6

Issue date:December 1, 2021

Publication year:2021

Pages:191-196

Language:English

E-ISSN:13358871

Document type:Journal article (JA)

Publisher:Sciendo

Abstract:<div data-language="eng" data-ev-field="abstract">Streak tubes with large-format and high spatial resolution are central to mm-spatial-resolved STIL detection system and hyperspectral resolved ICF experiment. In this paper, we established a large-format streak tube with a three-coaxial-cylindrical single-lens focusing system, a spherically curved photocathode and phosphor screen model in CST Particle Studio. The temporal and spatial resolution were calculated and mimicked based on the Monte-Carlo sampling method in static and dynamic mode. The simulated results show that the static spatial resolution reaches 50 lp/mm over the whole 50 mm effective photocathode length, and the physical temporal resolution is better than 45 ps. Furthermore, in dynamic working mode, the streak tube can achieve spatial resolution of 10 lp/mm and temporal resolution of 60 ps. The simulation results will be used to guide the design and production for large-format with high spatial resolution streak tube development.<br/></div> © 2021 Liping Tian et al., published by Sciendo.

Number of references:14

Main heading:Photocathodes

Controlled terms:Signal to noise ratio - Image resolution - Tubes (components) - Monte Carlo methods - Focusing - Streak cameras

Uncontrolled terms:Detection system - Focusing system - High spatial resolution - HyperSpectral - Large-format - Single-lens focusing system - Spatial resolution - Streak tubes - Temporal resolution - Ultrafast detectors

Classification code:619.1 Pipe, Piping and Pipelines - 714.1 Electron Tubes - 716.1 Information Theory and Signal Processing - 741.3 Optical Devices and Systems - 742.2 Photographic Equipment - 922.2 Mathematical Statistics

Numerical data indexing:Size 5.00E-02m, Time 4.50E-11s, Time 6.00E-11s

DOI:10.2478/msr-2021-0026

Funding details: Number: SKLST202012, Acronym: -, Sponsor: -;Number: GJJSTD20190004, Acronym: -, Sponsor: -;Number: BK20190112, Acronym: -, Sponsor: Natural Science Foundation of Jiangsu Province;Number: jit-b-201814,jit-b-202012, Acronym: JIT, Sponsor: Jinling Institute of Technology;

Funding text:This study is supported by Scientific Instrument Developing Project of the Chinese Academy of Sciences (Grant No. GJJSTD20190004), the Nature Science Foundation of Jiangsu Province, China (Grant No. BK20190112), the Open Research Fund of State Key Laboratory of Transient Optics and Photonics (Grant No. SKLST202012), and the Ph.D. Project supported by the Jinling Institute of Technology (Grant No. jit-b-201814 and No. jit-b-202012).

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20211710256810

Title:Influence of Sm<sup>3+</sup> doping on the relaxation behaviors of KSr<inf>2</inf>Nb<inf>5</inf>O<inf>15</inf> ferroelectric ceramics and the luminescence modulation effect by polarization engineering

Authors:Cao, Shuyao (1); Chen, Qian (1); Li, Yangping (1); Wu, Changying (2); Feng, Xiaoying (1); Xu, Jie (1); Cheng, Guanghua (2, 3); Gao, Feng (1)

Corresponding author:Gao, Feng(gaofeng@nwpu.edu.cn)

Source title:Ceramics International

Abbreviated source title:Ceram Int

Volume:47

Issue:14

Issue date:July 15, 2021

Publication year:2021

Pages:20286-20297

Language:English

ISSN:02728842

CODEN:CINNDH

Document type:Journal article (JA)

Publisher:Elsevier Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">The luminescence modulation behavior of lanthanide ion doped materials possesses great potential for applications in sensing, display and anti-counterfeiting devices. Unlike traditional tuning methods for chemical compositions, novel rare-earth doped ferroelectric oxides exhibit attractive luminescence modulation effects via electric polarization engineering, and enrich the development of multifunctional devices. In this work, Sm<sup>3+</sup> doped KSr<inf>2</inf>Nb<inf>5</inf>O<inf>15</inf> ceramics with abundant ferroelectric and luminescent properties were synthesized. The samples show different relaxation behaviors and ferroelectric features upon chemical and structural factors caused by Sm<sup>3+</sup> doping, such as average ionic radii, local tolerance factors, and chemical bonds. After polarization at 20 kV/cm for 20 min, a considerable increase (~40%) in the luminescent emission intensity was obtained in 4 mol. % Sm<sup>3+</sup> doped KSr<inf>2</inf>Nb<inf>5</inf>O<inf>15</inf> ceramics. The related luminescence modulation mechanism was attributed to controlling the environmental symmetry around Sm<sup>3+</sup> by the electric polarization.<br/></div> © 2021 Elsevier Ltd and Techna Group S.r.l.

Number of references:48

Main heading:Modulation

Controlled terms:Niobium compounds - Polarization - Samarium compounds - Strontium compounds - Display devices - Rare earths - Luminescence - Ferroelectric materials - Ferroelectricity

Uncontrolled terms:Anti-counterfeiting - Dielectric property (C) - Electric polarization - Ferroelectric property (C) - Ion-doped materials - Lanthanide ion - Luminescence modulation (author selected) - Modulation effects - Niobate (D) - Relaxation behaviors

Classification code:701.1 Electricity: Basic Concepts and Phenomena - 708.1 Dielectric Materials - 722.2 Computer Peripheral Equipment - 741.1 Light/Optics - 804.2 Inorganic Compounds

Numerical data indexing:Amount of substance 4.00E+00mol, Electric field strength 2.00E+03V/m, Percentage 4.00E+01%, Time 1.20E+03s

DOI:10.1016/j.ceramint.2021.04.037

Funding details: Number: 51961135301, Acronym: -, Sponsor: -;Number: 2020 KW-032,B20028, Acronym: -, Sponsor: -;Number: 52072301, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:This work was supported by the China-Poland International Collaboration Fund of National Natural Science Foundation of China (No. 51961135301), National Natural Science Foundation of China (No. 52072301), the International Cooperation Foundation of Shaanxi Province (No. 2020 KW-032), the ‘111’ Project (No. B20028). We would like to thank the Analytical & Testing Center of Northwestern Polytechnical University for the testing of SEM and Raman spectra.

Database:Compendex

Accession number:20211710255818

Title:Grain-Orientation dependence about luminescence modulation behavior upon electric polarization in Sm<sup>3+</sup> doped KSr<inf>2</inf>Nb<inf>5</inf>O<inf>15</inf> textured ceramics

Authors:Cao, Shuyao (1); Chen, Qian (1); Li, Yangping (1); Wu, Changying (2); Feng, Xiaoying (1); Xu, Jie (1); Cheng, Guanghua (2, 3); Gao, Feng (1)

Corresponding author:Gao, Feng(gaofeng@nwpu.edu.cn)

Source title:Materials Letters

Abbreviated source title:Mater Lett

Volume:295

Issue date:July 15, 2021

Publication year:2021

Article number:129866

Language:English

ISSN:0167577X

E-ISSN:18734979

CODEN:MLETDJ

Document type:Journal article (JA)

Publisher:Elsevier B.V.

Abstract:<div data-language="eng" data-ev-field="abstract">Sm<sup>3+</sup> doped KSr<inf>2</inf>Nb<inf>5</inf>O<inf>15</inf> textured ceramics with grain-orientation were fabricated using tape casting technology. The influences of the grain orientation on the microstructures, dielectric and ferroelectric properties were characterized. Moreover, the samples possessed luminescence modulation behavior after polarization, which exhibited obvious grain-orientation dependence. A considerable modulation ratio of approximately 69% was obtained along the [00l] direction of textured ceramics, which was almost twice that of ceramics without grain orientation. This work provided a new strategy for the enhancement of luminescence modulation properties in rare-earth activator-doped ferroelectric oxides.<br/></div> © 2021 Elsevier B.V.

Number of references:14

Main heading:Luminescence

Controlled terms:Rare earths - Modulation - Ferroelectric materials - Potassium compounds - Textures - Samarium compounds - Ferroelectricity - Niobium compounds - Polarization

Uncontrolled terms:Dielectric and ferroelectric properties - Electric polarization - Grain orientation - Microstructures properties - Modulation properties - Modulation ratio - Orientation dependence - Polarization-modulation - Tape casting technology - Textured ceramics

Classification code:701.1 Electricity: Basic Concepts and Phenomena - 708.1 Dielectric Materials - 741.1 Light/Optics - 804.2 Inorganic Compounds

Numerical data indexing:Percentage 6.90E+01%, Volume 0.00E00m3

DOI:10.1016/j.matlet.2021.129866

Funding details: Number: 51961135301, Acronym: -, Sponsor: -;Number: 2019KW-054,2020KW-032,B20028, Acronym: -, Sponsor: -;Number: 52072301, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:This work was supported by the China-Poland International Collaboration Fund of National Natural Science Foundation of China (No. 51961135301 ), National Natural Science Foundation of China (No. 52072301 ), the International Cooperation Foundation of Shaanxi Province (No. 2019KW-054 , 2020KW-032 ), the ‘111’ Project (No. B20028). We would like to thank the Analytical & Testing Center of Northwestern Polytechnical University for the PFM measurements.

Database:Compendex

Accession number:20210809969279

Title:A 4F optical diffuser system with spatial light modulators for image data augmentation

Authors:Li, Baopeng (1, 2, 3, 4); Ersoy, Okan K. (4); Ma, Caiwen (1); Pan, Zhibin (2); Wen, Wansha (1, 3); Song, Zongxi (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, No.17 Xinxi Rd., Xi'an; 710119, China; (2) Xi'an Jiaotong University, No.28 Xianning W Rd., Xi'an; 710049, China; (3) University of Chinese Academy of Sciences, No.19A Yuquan Rd., Beijing; 100049, China; (4) School of Electrical and Computer Engineering, Purdue University, 465 Northwestern Ave., West Lafayette; IN; 47906, United States

Corresponding author:Pan, Zhibin(zbpan@mail.xjtu.edu.cn)

Source title:Optics Communications

Abbreviated source title:Opt Commun

Volume:488

Issue date:June 1, 2021

Publication year:2021

Article number:126859

Language:English

ISSN:00304018

CODEN:OPCOB8

Document type:Journal article (JA)

Publisher:Elsevier B.V.

Abstract:This paper proposes a novel image data augmentation method based on the 4F optical diffuser system with two spatial light modulators. The method combines data augmentation methods based on geometric transformations with optical phase diffuser, resulting in a system which is effective and easy-to-use. This method can be used in an all-optical machine learning system or in a hybrid digital-optical system, and its digital implementation can also be used in learning-based computer vision applications. The method was tested in image classification of MNIST dataset. It was demonstrated that the augmented dataset significantly improves the classification accuracy.<br/> © 2021 Elsevier B.V.

Number of references:37

Main heading:Image classification

Controlled terms:Light modulators - Optical signal processing - Light modulation - Classification (of information) - Learning systems - Optical systems

Uncontrolled terms:Classification accuracy - Computer vision applications - Data augmentation - Digital implementation - Geometric transformations - Optical diffusers - Optical phase - Spatial light modulators

Classification code:716.1 Information Theory and Signal Processing - 723.2 Data Processing and Image Processing - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 903.1 Information Sources and Analysis

DOI:10.1016/j.optcom.2021.126859

Funding details: Number: -, Acronym: -, Sponsor: Purdue University;Number: 61906186, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: -, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 1188000111,GFZX04014307, Acronym: -, Sponsor: Youth Innovation Promotion Association of the Chinese Academy of Sciences;Number: 2018YFC0115304, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Funding text:Baopeng Li was supported by the CAS Scholarship for 17 months study at Purdue University. This work is supported by National Key Research and Development Program of China ( 2018YFC0115304 ); Youth Innovation Promotion Association of the Chinese Academy of Sciences ( 1188000111 ); Major Project of High-resolution Earth Observation System of China ( GFZX04014307 ); National Natural Science Foundation of China ( 61906186 ).

Database:Compendex

Accession number:20210409818635

Title:Extended focused imaging in microscopy using structure tensor and guided filtering

Authors:Ren, Zhenbo (1, 2); Guan, Peiyan (3); Lam, Edmund Y. (3); Zhao, Jianlin (1)

Author affiliation:(1) MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, and Shaanxi Key Laboratory of Optical Information Technology, School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an; 710129, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; Shaanxi; 710119, China; (3) Department of Electrical and Electronic Engineering, The University of Hong Kong, Pokfulam, Hong Kong

Corresponding author:Ren, Zhenbo(zbren@nwpu.edu.cn)

Source title:Optics and Lasers in Engineering

Abbreviated source title:Opt Lasers Eng

Volume:140

Issue date:May 2021

Publication year:2021

Article number:106549

Language:English

ISSN:01438166

CODEN:OLENDN

Document type:Journal article (JA)

Publisher:Elsevier Ltd

Abstract:The limited depth-of-field (DOF) in optical microscopic imaging systems prevents them from capturing an entirely focused images when the imaged scene is thick and covers a wide range of depth. Specimens lying outside the DOF is defocused and thus blurred, hindering the subsequent observation and analysis. Extended focused imaging aims at yielding a single all-in-focus image by combining the in-focus information from a stack of partially focused images. In this paper, we present a new algorithm for digitally extending the low DOF of a microscopic imaging system. The method is based on the two-scale decomposition of an image into a base layer and a detail layer, both of which contain information of different scales. Then, with the structure tensor, which is uniquely advantageous for autofocusing multi-focal planes, as the focus measure, initial weight maps are generated. The guided filtering is then employed to optimize the weighted averaging scheme for the fusion of the base and detail layers. We examine the proposed algorithm under incoherent and coherent imaging modalities, i.e., bright-field microscopy and digital holographic microscopy. Qualitative and quantitative comparisons with the existing approaches are carried out using extensive experimental data. The results show the advantages and superior performance of the proposed scheme even in the presence of coherent noise.<br/> © 2021 Elsevier Ltd

Number of references:49

Main heading:Microscopic examination

Controlled terms:Imaging systems - Tensors - Holography - Phase measurement

Uncontrolled terms:All-in-focus image - Bright-field microscopy - Coherent imaging - Digital holographic microscopy - Microscopic imaging - Quantitative comparison - Structure tensors - Weighted averaging

Classification code:743 Holography - 746 Imaging Techniques - 921.1 Algebra - 942.2 Electric Variables Measurements

DOI:10.1016/j.optlaseng.2021.106549

Funding details: Number: SKLST202008, Acronym: -, Sponsor: -;Number: 61905197,61927810, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 310201911qd002, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;

Funding text:This work was in part supported by the National Natural Science Foundation of China (61905197, 61927810), the Fundamental Research Funds for the Central Universities (310201911qd002) and the Open Research Fund of State Key Laboratory of Transient Optics and Photonics (SKLST202008).

Database:Compendex

Accession number:20214111013822

Title:808 nm broad-area laser diodes designed for high efficiency at high-temperature operation (Open Access)

Authors:Lan, Yu (1, 2); Yang, Guowen (1, 2, 3); Liu, Yuxian (1, 2); Zhao, Yuliang (1, 2); Wang, Zhenfu (1); Li, Te (1); Demir, Abdullah (4)

Corresponding authors:Yang, Guowen(yangguowen@opt.ac.cn); Demir, Abdullah(abdullah.demir@unam.bilkent.edu.tr)

Source title:Semiconductor Science and Technology

Abbreviated source title:Semicond Sci Technol

Volume:36

Issue:10

Issue date:October 2021

Publication year:2021

Article number:105012

Language:English

ISSN:02681242

E-ISSN:13616641

CODEN:SSTEET

Document type:Journal article (JA)

Publisher:IOP Publishing Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">Semiconductor lasers with high power conversion efficiency (PCE) and output power are heavily investigated driven by more energy-efficient commercial applications. In this paper, an asymmetric broad area laser (A-BAL) design is studied and compared with a conventional symmetric broad area laser (S-BAL) design for 808 nm single emitter laser diodes. We present a comparative theoretical and experimental investigation by studying the thermal effects on the laser parameters. The output characteristics and efficiency loss paths for the designs were analyzed. The leakage of carriers was identified as the primary source of the PCE reduction with temperature. Suppressing this leakage by optimization of the A-BAL design, a record continuous-wave PCE of 68% at 25 C and 60.4% at 75 C were achieved for a single emitter laser with 10 W output power. These devices deliver high efficiency at high temperatures with reliable operation achieving 2000 h of an accelerated aging lifetime without failures.<br/></div> © 2021 IOP Publishing Ltd.

Number of references:38

Main heading:Semiconductor lasers

Controlled terms:Energy efficiency - Power semiconductor diodes - High power lasers - High temperature operations

Uncontrolled terms:808 nm - Broad-area laser diode - Broad-area lasers - High power - High-temperature operation - Higher efficiency - Laser designs - Output power - Power conversion efficiencies - Single emitter lasers

Classification code:525.2 Energy Conservation - 714.2 Semiconductor Devices and Integrated Circuits - 744.1 Lasers, General - 744.4.1 Semiconductor Lasers

Numerical data indexing:Percentage 6.04E+01%, Percentage 6.80E+01%, Power 1.00E+01W, Size 8.08E-07m, Time 7.20E+06s

DOI:10.1088/1361-6641/ac2160

Database:Compendex

Open Access type(s): All Open Access, Green

Accession number:20210509874607

Title:Modeling and simulation analysis of a non-line-of-sight infrared laser imaging system

Authors:Tan, Jingjing (1, 2); Su, Xiuqin (1); Wang, Kaidi (1, 2); Wu, Jingyao (1, 2)

Author affiliation:(1) Cas Key Laboratory of Space Precision Measurement, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, 17 Xinxi Road, Xian, Shaanxi; 710119, China; (2) University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing; 100049, China

Corresponding author:Su, Xiuqin(suxiuqin@opt.ac.cn)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11761

Part number:1 of 1

Issue title:Fourth International Conference on Photonics and Optical Engineering

Issue date:2021

Publication year:2021

Article number:117610M

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510643574

Document type:Conference article (CA)

Conference name:4th International Conference on Photonics and Optical Engineering

Conference date:October 15, 2020 - October 16, 2020

Conference location:Xi'an, China

Conference code:166676

Publisher:SPIE

Abstract:Non-line-of-sight (NLOS) imaging technology is to â€ see' the target out of sight, such as an object around a corner or hidden by some shelters. However, due to constraints of device definition and computing load, NLOS system is usually expensive and requires hidden objects with special material and simple shape. Besides, imaging space of system is limited. We perform a series of simulation with 1550nm infrared laser to expand the application field and improve the performance of NLOS system. Based on math and physical properties, main experimental components are modeled and data acquisition process is completed first. Then, the ellipsoid inversion algorithm is used to reconstruct the hidden space and imaging results are obtained. Finally, multiple series of system parameters are set and their influence on imaging results is analyzed. Results demonstrate that echo signal intensity after multiple reflections provides adequate information to reconstruct the geometry of a hidden object. However, the number of laser scanning position, resolution of detector, voxel division and location of the scanning area will all have a critical influence on NLOS imaging results.<br/> © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

Number of references:16

Main heading:Data acquisition

Controlled terms:Imaging systems - Infrared lasers

Uncontrolled terms:Acquisition process - Application fields - Imaging technology - Inversion algorithm - Laser scanning - Model and simulation - Multiple reflections - Nonline of sight

Classification code:723.2 Data Processing and Image Processing - 744.1 Lasers, General - 746 Imaging Techniques

Numerical data indexing:Size 1.55e-06m

DOI:10.1117/12.2585336

Funding details: Number: GQRC-19-19, Acronym: CAS, Sponsor: Chinese Academy of Sciences;

Funding text:This research was funded by Strategic High Technology Innovation Funding of Chinese Academy of Sciences (GQRC-19-19).

Database:Compendex

Accession number:20211810277558

Title:High-power operation and lateral divergence angle reduction of broad-area laser diodes at 976 nm

Authors:Liu, Yuxian (1, 2); Yang, Guowen (1, 2, 3); Wang, Zhenfu (1); Li, Te (1); Tang, Song (3); Zhao, Yuliang (1, 2); Lan, Yu (1, 2); Demir, Abdullah (4)

Corresponding author:Yang, Guowen

Source title:Optics and Laser Technology

Abbreviated source title:Opt Laser Technol

Volume:141

Issue date:September 2021

Publication year:2021

Article number:107145

Language:English

ISSN:00303992

CODEN:OLTCAS

Document type:Journal article (JA)

Publisher:Elsevier Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">Broad-area diode lasers with high output power and low lateral divergence angle are highly desired for extensive scientific and industrial applications. Here, we report on the epitaxial design for higher output power and a flared waveguide design for reduced divergence, which leads to high power operation with a low lateral divergence angle. A vertically asymmetric epitaxial structure was employed and optimized for low internal optical loss and high efficiency to realize high output power operation. Using a flared waveguide design, the lateral divergence angle was efficiently reduced by decreasing the number of high-order lateral optical modes significantly. The flared waveguide design introduces a smooth modification of the ridge width along the cavity without deteriorating laser performance. Based on the optimized epitaxial and waveguide design, we scaled the waveguide width to realize high continuous-wave power of 34.5 W at 25 °C. A low lateral divergence angle of 8° and high power conversion efficiency of 60% were achieved at the operating power level of 25 W. The life test data (30 A at 45 °C for 39 units, 0 failures in 1000 h) demonstrated reliable operation illustrating the efficient design for reduced lateral divergence angle and high operating power.<br/></div> © 2021 Elsevier Ltd

Number of references:37

Main heading:Semiconductor lasers

Controlled terms:Semiconductor diodes - Waveguides - Wave power - Efficiency

Uncontrolled terms:976 nm - Diode-laser - Divergence angle - Flared waveguide - High brightness - High output power - High power - Higher efficiency - Low divergence angle - Waveguide design

Classification code:615.6 Wave Energy - 714.2 Semiconductor Devices and Integrated Circuits - 714.3 Waveguides - 744.4.1 Semiconductor Lasers - 913.1 Production Engineering

Numerical data indexing:Electric current 3.00E+01A, Percentage 6.00E+01%, Power 2.50E+01W, Power 3.45E+01W, Size 9.76E-07m, Temperature 2.98E+02K, Temperature 3.18E+02K, Time 3.60E+06s

DOI:10.1016/j.optlastec.2021.107145

Funding text:This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

Database:Compendex

Accession number:20221612005096

Title:High performance parametric spectro-temporal analyzer assisted by a soliton microcomb

Authors:Hu, Hao (1); Yang, Ningning (1); Wang, Weiqiang (2, 3); Chen, Liao (1); Zhang, Chi (1); Zhang, Wenfu (2); Zhang, Xinliang (1)

Author affiliation:(1) Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan; 430074, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences (CAS), Xi'an; 710119, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China

Source title:Asia Communications and Photonics Conference, ACP

Abbreviated source title:Asia Commun. Photonics Conf.

Volume:2021-October

Part number:1 of 1

Issue title:2021 Asia Communications and Photonics Conference, ACP 2021 - Proceedings

Issue date:2021

Publication year:2021

Article number:T2I.2

Language:English

ISSN:2162108X

ISBN-13:9781957171005

Document type:Conference article (CA)

Conference name:2021 Asia Communications and Photonics Conference, ACP 2021

Conference date:October 24, 2021 - October 27, 2021

Conference location:Shanghai, China

Conference code:178242

Sponsor:CIC; COS; IEEE Photonics Society; Optica; SPIE

Publisher:Optica Publishing Group (formerly OSA)

Abstract:<div data-language="eng" data-ev-field="abstract">We experimentally demonstrated a high performance parametric spectro-temporal analyzer. Assisted by a soliton microcomb, it achieved a resolution of 4 pm, a bandwidth of 13 nm and the tunable frame rate from kHz to MHz.<br/></div> © Optica Publishing Group 2021

Number of references:10

Uncontrolled terms:Frame-rate - Microcombs - Performance - Tunables

Numerical data indexing:Size 1.30E-08m, Size 4.00E-12m

Funding details: Number: 61505060,61631166003,61675081,617 35006,61927817,62005090, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:Acknowledgement: The work was supported by the National Natural Science Foundation of China (61927817, 617 35006, 62005090, 61631166003, 61675081, 61505060).

Database:Compendex

Accession number:20204109338340

Title:Low loss and polarization-insensitive coupling length for a terahertz fiber directional coupler with symmetric dual-suspended core structure

Authors:Zhu, Yuan-Feng (1, 2, 3); Huang, Xu (1); Ke, Qiang (1); Liu, Guiqiang (1); Rao, Chun-Fang (1); Kong, Depeng (4); Mei, Sen (4); Liu, Yunqi (2); Wang, Hua (5)

Author affiliation:(1) The School of Physics and Communication Electronics, Jiangxi Normal University, Nanchang, Jiangxi; 330022, China; (2) The Key Lab of Specialty Fiber Optics and Optical Access Networks, School of Communication and Information Engineering, Shanghai University, Shanghai; 200444, China; (3) Key Laboratory of Optoelectronic and Telecommunication of Jiangxi Province, Nanchang, Jiangxi; 330022, China; (4) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, Shanxi Province; 710119, China; (5) State Grid Jiangxi Electric Power Corporation, Information and Communication Branch, Nanchang, China

Corresponding author:Ke, Qiang(keqiang@jxnu.edu.cn)

Source title:Optics Communications

Abbreviated source title:Opt Commun

Volume:480

Issue date:February 1, 2021

Publication year:2021

Article number:126497

Language:English

ISSN:00304018

CODEN:OPCOB8

Document type:Journal article (JA)

Publisher:Elsevier B.V., Netherlands

Abstract:In this work, a terahertz (THz) fiber directional coupler with a symmetric dual-suspended core structure has been proposed for realizing low loss and polarization-insensitive coupling length in the THz frequency region. The fiber core of the directional coupler consists of two round solid dielectric rods supported by two intersecting thin dielectric layers. Numerical simulations performed using the full-vector finite element method show that a short polarization-independent coupling length can be obtained by adjusting the geometric parameters of the fiber. Moreover, a low-loss THz fiber directional coupling performance can also be achieved at a central frequency of 1.00-THz and approximately 0.16 THz of bandwidth. For example, a coupler with a length of 0.421 cm has a transmission loss of 0.30 dB and 0.26 dB for the x- and y-polarization modes, respectively.<br/> © 2020

Number of references:31

Main heading:Fibers

Controlled terms:Polarization - Numerical methods - Dielectric materials - Directional couplers - Wave transmission

Uncontrolled terms:Directional coupling - Fiber directional coupler - Full vector finite element methods - Polarization independent coupling - Polarization modes - Polarization-insensitive - Thin dielectric layer - Transmission loss

Classification code:708.1 Dielectric Materials - 714.3 Waveguides - 921.6 Numerical Methods

Numerical data indexing:Decibel 2.60e-01dB, Decibel 3.00e-01dB, Frequency 1.00e+12Hz, Frequency 1.60e+11Hz, Size 4.21e-03m

DOI:10.1016/j.optcom.2020.126497

Funding details: Number: -, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: GJJ170185,GJJ170189, Acronym: -, Sponsor: -;Number: 61875117,12064016, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:This work was supported in part by the Natural National Science Foundation of China (NSFC) under Grant 61875117 , 12064016 and the Science and Technology Research Project of Jiangxi Provincial Education Department, China under GJJ170185 , GJJ170189 .

Database:Compendex

Accession number:20212510520186

Title:Aperture-averaged scintillation index and fade statistics in weak oceanic turbulence

Authors:Wang, Hao (1, 2); Kang, Fu-Zeng (1); Wang, Xuan (3, 4); Zhao, Wei (1); Sun, Shu-Wei (1, 2)

Corresponding authors:Kang, Fu-Zeng(kangfuzeng@opt.ac.cn); Wang, Xuan(xw@iphy.ac.cn)

Source title:Chinese Physics B

Abbreviated source title:Chin. Phys.

Volume:30

Issue:6

Issue date:May 2021

Publication year:2021

Article number:064207

Language:English

ISSN:16741056

E-ISSN:20583834

Document type:Journal article (JA)

Publisher:IOP Publishing Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">With the rapid demand for underwater optical communication (UOC), studies of UOC degradation by oceanic turbulence have attached increasing attention worldwide and become a research hot-spot in recent years. Previous studies used a simplified and inaccurate oceanic turbulence spectrum, in which the eddy diffusivity ratio between temperature and salinity is assumed to be unity and the outer scale of turbulence is assumed to be infinite. However, both assumptions are not true in most of the actual marine environments. In this paper, based on the Rytov theory in weak turbulence, we derive analytical expressions of "the aperture-averaged scintillation index"(SI) for both plane and spherical waves, which can clearly demonstrate how SI is influenced by several key factors in UOC. Then, typical fade statistics of the UOC system in weak turbulence is discussed including the probability of fade, the expected number of fades per time, the mean fade time, signal-to-noise ratio and bit error rate. Our results show that spherical wave is preferable in the UOC system in weak turbulence compared to plane wave, and the aperture-averaged effect has a significant impact on UOC system's performance. Our results can be used to determine those key parameters for designing the UOC system over reasonable ranges.<br/></div> © 2021 Chinese Physical Society and IOP Publishing Ltd.

Number of references:28

Main heading:Turbulence

Controlled terms:Signal to noise ratio - Error statistics - Bit error rate - Scintillation - Optical communication - Underwater optical wireless communication

Uncontrolled terms:Analytical expressions - Eddy Diffusivities - Marine environment - Oceanic turbulence - Scintillation index - Spherical waves - System's performance - Underwater optical communications

Classification code:675 Marine Engineering - 716.1 Information Theory and Signal Processing - 717.1 Optical Communication Systems - 723.1 Computer Programming - 741.1 Light/Optics - 922.2 Mathematical Statistics

DOI:10.1088/1674-1056/abd756

Funding details: Number: -, Acronym: XIOPM, Sponsor: Xi'an Institute of Optics and Precision Mechanics;

Funding text:Project supported by the fund from Xi'an Institute of Optics and Precision Mechanics.

Database:Compendex

Accession number:20212410502905

Title:Lidar-radar for underwater target detection using a modulated sub-nanosecond Q-switched laser

Authors:Li, Guangying (1, 2); Zhou, Qiang (3); Xu, Guoquan (4); Wang, Xing (1); Han, Wenjie (5); Wang, Jiang (3); Zhang, Guodong (3); Zhang, Yifan (4); Yuan, Zhi'an (4); Song, Sijia (5); Gu, Shangtai (4); Chen, Fubin (4); Xu, Ke (4); Tian, Jinshou (1); Wan, Jianwei (4); Xie, Xiaoping (1, 2); Cheng, Guanghua (3)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China; (2) School of Future Technology, University of Chinese Academy of Sciences, Beijing; 100049, China; (3) School of Artificial Intelligence, Optics and Electronics (iOPEN), Northwestern Polytechnical University, Xi'an; 710072, China; (4) College of Electronic Science and Technology, National University of Defense Technology, Changsha; 410073, China; (5) The 27th Research Institute of China Electronics Technology Group Corporation, Zhengzhou; 450047, China

Corresponding author:Xie, Xiaoping(xxp@opt.ac.cn)

Source title:Optics and Laser Technology

Abbreviated source title:Opt Laser Technol

Volume:142

Issue date:October 2021

Publication year:2021

Article number:107234

Language:English

ISSN:00303992

CODEN:OLTCAS

Document type:Journal article (JA)

Publisher:Elsevier Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">Here we report on a modulated sub-nanosecond lidar-radar for underwater target detection. The modulated laser source is consisted of a 1064 nm master oscillator power amplifier (MOPA) and a frequency-doubling module, outputting pulse energy of 178.1 mJ at 1064 nm with 0.76 ns pulse duration and 87.6 mJ at 532 nm. By using a Fabry–Pérot cavity containing a KTP crystal and two reflectors, the 532 nm laser pulse is modulated into the burst mode with a repetition rate of 500 MHz. A streak tube camera is used as the signal receiving apparatus. An underwater target detection experiment has been carried out. The results indicate that this lidar-radar could emit a stable and powerful modulated signal, which greatly increases the underwater detection range. The cooperation of the streak tube imaging and modulated laser source for underwater target detection experiments is the first attempt in this field. The clear 3-D and 4-D images of the target underwater across 20 m are obtained in the experiments and the spatial resolution of 9 mm can be achieved.<br/></div> © 2021

Number of references:40

Main heading:Optical radar

Controlled terms:Underwater acoustics - Frequency doublers - Pulse repetition rate - Q switched lasers - Q switching - Tracking radar - Power amplifiers

Uncontrolled terms:1064 nm - Detection experiments - Fabry–perot cavity modulating - Laser sources - Lidar-radar - Modulated lasers - Streak tubes - Sub nanoseconds - Sub-nanosecond laser - Underwater target detection

Classification code:713.1 Amplifiers - 713.5 Electronic Circuits Other Than Amplifiers, Oscillators, Modulators, Limiters, Discriminators or Mixers - 716.2 Radar Systems and Equipment - 741.3 Optical Devices and Systems - 744.1 Lasers, General - 744.8 Laser Beam Interactions - 751.1 Acoustic Waves

Numerical data indexing:Energy 1.781E-01J, Energy 8.76E-02J, Frequency 5.00E+08Hz, Size 1.064E-06m, Size 2.00E+01m, Size 5.32E-07m, Size 9.00E-03m, Time 7.60E-10s

DOI:10.1016/j.optlastec.2021.107234

Funding details: Number: 2018YFB1107401, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Funding text:This work was supported by the National Key Research and Development Program [grant number 2018YFB1107401 ].

Database:Compendex

Accession number:20210910003209

Title:Tumor imaging of a novel Ho<sup>3+</sup>-based biocompatible NIR fluorescent fluoride nanoparticle

Authors:Fan, Q. (1, 2); Zhang, G.W. (4); Peng, B. (1, 3)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Science (CAS), Xi'an; Shaanxi; 710119, China; (2) University of Chinese Academy of Sciences (UCAS), Beijing; 100049, China; (3) Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing; 100049, China; (4) Zhejiang Fountain Aptitude Technology Inc., Hangzhou; Zhejiang; 310051, China

Corresponding author:Peng, B.(bpeng@opt.ac.cn)

Source title:Journal of Luminescence

Abbreviated source title:J Lumin

Volume:235

Issue date:July 2021

Publication year:2021

Article number:118007

Language:English

ISSN:00222313

CODEN:JLUMA8

Document type:Journal article (JA)

Publisher:Elsevier B.V.

Abstract:Cancer has become the leading cause of death for its high incidence and mortality. Early diagnosis and treatment are essential for the inhibition of tumor growth. In this work, A biocompatible, nontoxic, near-infrared fluorescent tumor targeting nanoparticle KHLF(K<inf>5</inf>HoLi<inf>2</inf>F<inf>10</inf>) was prepared by a delicate method for the early diagnosis of tumor. The surface functionalization of the nanoparticle endows it with good water solubility and biocompatibility. Covalent binding to folic acid provides it with the ability to target HeLa cells. After modification, this nanoparticle can still maintain high fluorescence intensity and it can be detected in 2 cm thick pork tissue. We carried out biodistribution imaging, organs imaging and tumor targeting imaging experiments to characterize its imaging ability in vivo. The results show that this nanoparticle could accurately accumulate in HeLa tumor and generate significant fluorescence signal, which confirms the nanoparticle has great potential as a efficient biocompatible fluorescent contrast agent for tumor diagnosis.<br/> © 2021 Elsevier B.V.

Number of references:63

Main heading:Nanoparticles

Controlled terms:Diagnosis - Fluorescence - Tumors - Biocompatibility - Infrared devices - Lanthanum compounds - Fluorine compounds

Uncontrolled terms:Fluorescence intensities - Fluorescence signals - Fluorescent contrast agents - Fluoride nanoparticles - Good water-solubility - Inhibition of tumor growth - Near-infrared fluorescent - Surface Functionalization

Classification code:461.2 Biological Materials and Tissue Engineering - 461.6 Medicine and Pharmacology - 461.9.1 Immunology - 741.1 Light/Optics - 761 Nanotechnology - 933 Solid State Physics

Numerical data indexing:Size 2.00e-02m

DOI:10.1016/j.jlumin.2021.118007

Funding details: Number: -, Acronym: XIOPM, Sponsor: Xi'an Institute of Optics and Precision Mechanics;Number: -, Acronym: UCAS, Sponsor: University of Chinese Academy of Sciences;

Funding text:The authors would like to thank the Advanced optoelectronic and biomaterial laboratory of Xi'an Institute of Optics and precision machinery and University of Chinese Academy of Sciences.

Database:Compendex

Accession number:20212510518780

Title:Two-dimensional optical gap solitons and vortices in a coherent atomic ensemble loaded on optical lattices

Authors:Chen, Zhiming (1, 2, 3); Zeng, Jianhua (2)

Author affiliation:(1) State Key Laboratory of Nuclear Resources and Environment & School of Science, East China University of Technology, Nanchang; 330013, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi'an; 710119, China; (3) Collaborative Innovation Center of Light Manipulations and Applications, Shandong Normal University, Jinan; 250358, China

Corresponding author:Zeng, Jianhua(zengjh@opt.ac.cn)

Source title:Communications in Nonlinear Science and Numerical Simulation

Abbreviated source title:Comm. Nonlinear Sci. Numer. Simul.

Volume:102

Issue date:November 2021

Publication year:2021

Article number:105911

Language:English

ISSN:10075704

Document type:Journal article (JA)

Publisher:Elsevier B.V.

Abstract:<div data-language="eng" data-ev-field="abstract">Coherent atomic systems, e.g., resonantly cold atomic gases within which electromagnetically induced transparency (EIT) operates, have recently received great attention, because of their remarkable scientific properties and pivotal implications. Light behavior in such systems governed by various potentials is a new and interesting research focus, but missing literally report on two-dimensional (2D) localized gap modes in coherent atomic systems loaded on optical lattices. We survey such issue in a coherent atomic gas inside where the EIT turns on, trapped by 2D optical lattices—constituted by counter-propagating far-detuned Stark laser fields, in the framework of nonlinear Schrödinger equation derived from Maxwell-Bloch equations. Using the linear stability analysis and direct perturbed evolution we address the formation, property, and stability of 2D localized gap modes of two types, gap solitons and gap vortices, in forbidden band gaps of the underlying linear Bloch-wave spectrum. The former mode is fundamental gap solitons, and the latter belongs to higher-order gap solitons with embedded topological charge. Our results are helpful not only for in-depth understanding of soliton dynamics in coherent atomic ensemble loaded on periodic potentials, but also for laying the groundwork for forthcoming applications in optical communications and quantum information processing.<br/></div> © 2021 Elsevier B.V.

Number of references:67

Main heading:Optical lattices

Controlled terms:Energy gap - Nonlinear optics - Solitons - Vortex flow - Crystal lattices - Gases - Linear stability analysis - Nonlinear equations - Optical materials - Quantum optics - Optical communication - Atoms - Transparency - Maxwell equations

Uncontrolled terms:Atomic ensemble - Atomic system - Electromagnetically-induced transparency - Gap soliton - Gap vortex - Kerr nonlinearity - Kerrnonlinearities - Optical gap soliton and vortex - Optical- - Two-dimensional

Classification code:631.1 Fluid Flow, General - 701.1 Electricity: Basic Concepts and Phenomena - 701.2 Magnetism: Basic Concepts and Phenomena - 717.1 Optical Communication Systems - 741.1 Light/Optics - 741.1.1 Nonlinear Optics - 741.3 Optical Devices and Systems - 744.8 Laser Beam Interactions - 921 Mathematics - 921.2 Calculus - 931.3 Atomic and Molecular Physics - 931.4 Quantum Theory; Quantum Mechanics - 933.1.1 Crystal Lattice

DOI:10.1016/j.cnsns.2021.105911

Funding details: Number: DHBK2016118, Acronym: -, Sponsor: -;Number: 11704066,12074063,12074423, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 20202BABL211013, Acronym: -, Sponsor: Natural Science Foundation of Jiangsu Province;Number: GJJ160576,GJJ180378, Acronym: -, Sponsor: Education Department of Jiangxi Province;

Funding text:This work was supported by the National Natural Science Foundation of China (Grant Nos. 11704066 , 12074423 , and 12074063 ), Jiangxi Provincial Natural Science Foundation (Grant No. 20202BABL211013), Science and Technology Project of Jiangxi Provincial Education Department (Grant Nos. GJJ160576 and GJJ180378), and East China University of Technology Research Foundation for Advanced Talents (Grant No. DHBK2016118).

Database:Compendex

Accession number:20220211438097

Title:Large field of view 3D detection with a bionic curved compound-eye camera

Authors:Liu, Jinheng (1, 2); Zhang, Yuanjie (1, 2); Xu, Huangrong (1, 2); Yu, Weixing (1, 2)

Author affiliation:(1) Key Laboratory of Spectral Imaging Technology of Chinese Academy of Sciences, Xi'an Institute of Optics and Precision Mechanics, No.17, Xinxi Road, Xian; 710119, China; (2) Center of Mechanics Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing; 100049, China

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12065

Part number:1 of 1

Issue title:AOPC 2021: Optical Sensing and Imaging Technology

Issue date:2021

Publication year:2021

Article number:120651H

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510650053

Document type:Conference article (CA)

Conference name:2021 Applied Optics and Photonics China: Optical Sensing and Imaging Technology, AOPC 2021

Conference date:June 20, 2021 - June 22, 2021

Conference location:Beijing, China

Conference code:175876

Sponsor:Chinese Society for Optical Engineering

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">In the bionic curved compound-eye camera (BCCEC) we have invented, the overlapping field of view (FOV) among the ommatidia makes 3D detection possible. In this work, we analyzed the overlapping FOV in BCCEC in detail to prove its potential in 3D detection and designed a new experiment to test its performance. In that the FOVs of multiple ommatidia in BCCEC overlap each other, the FOV of a single ommatidium is used as a representative analysis. The relationship between the overlapping ratio of FOV and the object distance is quantitatively calculated. The results show that more than 95% of the FOV can be 3D reconstructed when the object distance exceeds 32 cm. Next, in order to realize the automatic calibration of all ommatidia, ommatidia are numbered and an addressing algorithm based on the number information of ommatidia is designed, which can be used to determine the adjacent ommatidia of any ommatidium so as to acquire the ommatidia pairs that need to be calibrated. Then, since the aperture of ommatidium is relatively small and it is difficult to accurately align, a new 3D detection experiment is designed. The laser rangefinder is fixed, the black paper is used to block the laser and the formed light spot is used as the detection target. The experimental results show that 3D detection can be performed in the whole FOV of BCCEC. The BCCEC can obtain multi-dimensional information in a large FOV, and it have greater application potential in obstacle avoidance and navigation.<br/></div> © 2021 SPIE.

Number of references:5

Main heading:Bionics

Controlled terms:Cameras - Range finders

Uncontrolled terms:3d detection - Automatic calibration - Compound eye - Compound-eye camera - Field of views - Large field of views - Number information - Object distance - Overlapping ratio - Performance

Classification code:461.1 Biomedical Engineering - 742.2 Photographic Equipment - 943.1 Mechanical Instruments

Numerical data indexing:Percentage 9.50E+01%, Size 3.20E-01m

DOI:10.1117/12.2605594

Funding details: Number: 61975231, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:The authors would like to thank the Natural Science Foundation of China (No. 61975231) for financial support.

Database:Compendex

Accession number:20210509874606

Title:Analysis on effect of filling glue between the frame and lens with small aperture

Authors:Song, Yang (1); Ye, Jing (1, 2); Chai, Wenyi (1); Chu, Nanqing (1, 2); Xu, Yang (1); Hu, Yongming (1)

Author affiliation:(1) Xian Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xian; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Hu, Yongming(huyongming@opt.ac.cn)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11761

Part number:1 of 1

Issue title:Fourth International Conference on Photonics and Optical Engineering

Issue date:2021

Publication year:2021

Article number:117610L

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510643574

Document type:Conference article (CA)

Conference name:4th International Conference on Photonics and Optical Engineering

Conference date:October 15, 2020 - October 16, 2020

Conference location:Xi'an, China

Conference code:166676

Publisher:SPIE

Abstract:There are different kinds of mirror in the space instrument. Sometimes, engineers use filling glue to fill the small gap of the lens and its frame. Thus the structure may be more stable. However, this kind of method could also bring some new problems. Because of different thermal expansion coefficient of the lens and frame, the thermal deformation may be different during the temperature change, which will affect the surface accuracy of the lens and the vibration response. The thickness of glue block and the distributed form of the glue are the key factors. The paper focused on these factors and did some simulations to find out how these factors affect the surface accuracy and fundamental frequency. Then, the paper gave some proposals on this issue.<br/> © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

Number of references:7

Main heading:Glues

Controlled terms:Filling - Gluing - Thermal expansion

Uncontrolled terms:Fundamental frequencies - Small aperture - Space instrument - Surface accuracy - Temperature changes - Thermal deformation - Thermal expansion coefficients - Vibration response

Classification code:641.1 Thermodynamics - 691.2 Materials Handling Methods - 951 Materials Science

DOI:10.1117/12.2584978

Database:Compendex

Accession number:20211910343214

Title:Research on Ray Tracing Algorithm and Acceleration Techniques using KD-tree

Authors:Zhou, Jia (1); Wen, Desheng (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics of Cas, Xi'an; 710119, China

Source title:2021 IEEE 6th International Conference on Intelligent Computing and Signal Processing, ICSP 2021

Abbreviated source title:IEEE Int. Conf. Intell. Comput. Signal Process., ICSP

Part number:1 of 1

Issue title:2021 IEEE 6th International Conference on Intelligent Computing and Signal Processing, ICSP 2021

Issue date:April 9, 2021

Publication year:2021

Pages:107-110

Article number:9409001

Language:English

ISBN-13:9780738143705

Document type:Conference article (CA)

Conference name:6th IEEE International Conference on Intelligent Computing and Signal Processing, ICSP 2021

Conference date:April 9, 2021 - April 11, 2021

Conference location:Xi'an, China

Conference code:168663

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">In the field of computer graphics, ray tracing algorithm is a kind of algorithm that can realize global illumination. Using the parallel computing power of GPU to accelerate ray tracing is one of the research hotpots at present. Based on the principle of ray tracing, this paper focuses on analyzing the two major problems of ray tracing algorithm acceleration research. One is the data structure problem, the other is the implementation of traversal algorithm on GPU. Based on the summary of the existing research, this paper discusses the derivation of the intersection of ray and surface element, compares various data structures, and analyzes the traversal algorithm based on KD-tree on GPU.<br/></div> © 2021 IEEE.

Number of references:11

Main heading:Graphics processing unit

Controlled terms:Data structures - Computing power - Ray tracing - Trees (mathematics)

Uncontrolled terms:Acceleration technique - Global illumination - K-d tree - Parallel com- puting - Ray-tracing algorithm - Surface elements - Traversal algorithms

Classification code:714.2 Semiconductor Devices and Integrated Circuits - 721.3 Computer Circuits - 722.2 Computer Peripheral Equipment - 722.4 Digital Computers and Systems - 723 Computer Software, Data Handling and Applications - 723.2 Data Processing and Image Processing - 741.1 Light/Optics - 921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory

DOI:10.1109/ICSP51882.2021.9409001

Database:Compendex

Accession number:20210509874609

Title:A new type of unitized design for the structure of a space camera using topology optimization

Authors:Ye, Jing (1); Song, Yang (2); Duan, Yongqiang (2); Hu, Yongming (2); Hu, Bin (1)

Author affiliation:(1) University of Chinese Academy of Sciences, Beijing; 100049, China; (2) Xian Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xian; 710119, China

Corresponding author:Ye, Jing(yejing@opt.ac.cn)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11761

Part number:1 of 1

Issue title:Fourth International Conference on Photonics and Optical Engineering

Issue date:2021

Publication year:2021

Article number:117610O

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510643574

Document type:Conference article (CA)

Conference name:4th International Conference on Photonics and Optical Engineering

Conference date:October 15, 2020 - October 16, 2020

Conference location:Xi'an, China

Conference code:166676

Publisher:SPIE

Abstract:Mechanical structure, of which a trade-off between weight and strength has always been considered primely, is important for a space camera as a hub for other assemblies such as optics parts, electronic parts, etc. Traditionally the space camera is composed of a nearly line-up of arrangements containing different units, which is easy to assemble and manufacture, however, not a good type for mechanical properties due to the cantilever structure. We present a new type of unitized design for the structure of the space camera, which unite the tube and the electric cabinet as one unit, with the PCBs (Printed Circuit Boards) surrounded. The main frame is optimized by using topology optimization, improving the characteristic of the structure. The maneuverability has also been considered. Compared with some traditional type, the new type proved to be lighter and more compact, which is beneficial to the mechanical properties and the cost control of satellite launching.<br/> © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

Number of references:6

Main heading:Shape optimization

Controlled terms:Cameras - Economic and social effects - Printed circuit boards - Topology

Uncontrolled terms:Cantilever structures - Cost controls - Electronic parts - Main-frames - Mechanical structures - Satellite launching - Space cameras - Trade off

Classification code:742.2 Photographic Equipment - 921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory - 921.5 Optimization Techniques - 971 Social Sciences

DOI:10.1117/12.2586549

Database:Compendex

Accession number:20220211437993

Title:Design of 1550nm adjustable laser lighting source

Authors:Mei, Chao (1); Chang, Sansan (1); Gao, Bo (1); Yi, Bo (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12065

Part number:1 of 1

Issue title:AOPC 2021: Optical Sensing and Imaging Technology

Issue date:2021

Publication year:2021

Article number:1206546

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510650053

Document type:Conference article (CA)

Conference name:2021 Applied Optics and Photonics China: Optical Sensing and Imaging Technology, AOPC 2021

Conference date:June 20, 2021 - June 22, 2021

Conference location:Beijing, China

Conference code:175876

Sponsor:Chinese Society for Optical Engineering

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">Shortwave laser is more and more widely used in gated imaging, tracking and pointing, communication and other fields. For the requirement of 1550nm high power laser source, The paper analyzes the realization way, and realized the 1550nm high power laser lighting source. We use multichannel semiconductor laser coupling to realize the high-power light source, and uses fiber coupling to realize the uniform spot. On this basis, an extended collimator is designed, which achieves 10 times of high-power The beam divergence angle can reach 9 mrad to 90 mrad, and the RMS value can be less than 1/4 of the wavelength at each magnification of the wave phase difference, which can meet the needs of engineering application.<br/></div> © 2021 SPIE.

Number of references:6

Main heading:Optical design

Controlled terms:High power lasers - Semiconductor lasers

Uncontrolled terms:1550nm - Gated imaging - High power - High power laser source - High-power lasers - Imaging tracking - Lighting source - Multi channel - Paper analysis - Tracking and pointing

Classification code:741.1 Light/Optics - 744.1 Lasers, General - 744.4.1 Semiconductor Lasers

Numerical data indexing:Absorbed dose 9.00E-05Gy to 9.00E-04Gy, Size 1.55E-06m

DOI:10.1117/12.2599777

Database:Compendex

Accession number:20211210107681

Title:Extraordinary Fast Forward and Backward Light in Transparent Non-Hermitian Systems

Authors:Zhang, Lingxuan (1); Ying, Lei (2); Ge, Li (3, 4); Zhao, Wei (1); Zhang, Wenfu (1)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) Interdisciplinary Center for Quantum Information and Department of Physics, Zhejiang University, Hangzhou; 310027, China; (3) Department of Physics and Astronomy, College of Staten Island, CUNY, Staten Island, New York; 10314, United States; (4) The Graduate Center, CUNY, New York; NY; 10016, United States

Corresponding authors:Zhang, Wenfu(wfuzhang@opt.ac.cn); Ge, Li(li.ge@csi.cuny.edu)

Source title:Laser and Photonics Reviews

Abbreviated source title:Laser Photon. Rev.

Volume:15

Issue:5

Issue date:May 2021

Publication year:2021

Article number:2000204

Language:English

ISSN:18638880

E-ISSN:18638899

Document type:Journal article (JA)

Publisher:John Wiley and Sons Inc

Abstract:<div data-language="eng" data-ev-field="abstract">The phenomenon of fast forward and backward light pulse propagation in effectively transparent non-Hermitian photonic systems is reported. Specifically, the propagation eigenmodes are analyzed in several parity-time-symmetric coupled waveguides. In contrast to a previous finding that showed slow light due to an exceptional point in such systems, a critical point in its close proximity that displays a diverging dispersion is identified. Superluminal light pulse propagation in the forward and backward directions is then found and observed numerically on the two sides of the critical point, respectively. This abnormal phenomenon can be understood by a conservation relation of group velocities, which can be extended to other transparent non-Hermitian photonic systems with different symmetries. More importantly, the abrupt transition across the critical point between the fast forward and backward light can be tuned, indicating the possibility of detecting atom-scale movement of the waveguides with little time delay. In addition, bandwidth broadening and a passive superluminal propagation configuration are discussed.<br/></div> © 2021 Wiley-VCH GmbH

Number of references:32

Main heading:Slow light

Controlled terms:Waveguides - Light transmission - Light

Uncontrolled terms:Abnormal phenomenon - Bandwidth broadening - Coupled waveguides - Exceptional points - Forward-and-backward - Light pulse propagation - Superluminal light - Superluminal propagation

Classification code:714.3 Waveguides - 741.1 Light/Optics

DOI:10.1002/lpor.202000204

Funding details: Number: 201903, Acronym: -, Sponsor: -;Number: 61635013,61675231,61705257,61805277, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 12004421,2016353, Acronym: -, Sponsor: Youth Innovation Promotion Association of the Chinese Academy of Sciences;Number: 2019JQ-447, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;

Funding text:L.Z. and L.Y. contributed equally to this work. Prof. Wenfu Zhang acknowledges the National Natural Science Foundation of China (Grant Nos. 61635013, 61675231, 61705257, and 61805277) and the Strategic Priority Research Program of the Youth Innovation Promotion Association of CAS (Grant No. 2016353). L.Z. acknowledges the National Natural Science Foundation of China (Grant No. 12004421), the Natural Science Foundation of Shaanxi Province (2019JQ-447), and the Research Project of Xi'an Postdoctoral Innovation Base (No. 201903).

Database:Compendex

Accession number:20210609889126

Title:Determination of the photoemission position in single-photon ionization with attosecond streaking spectroscopy

Authors:Wang, Feng (1); Liao, Qing (1); Liu, Kai (1); Qin, Meiyan (1); Zhang, Xiaofan (1); Zhang, Qingbin (2); Cao, Wei (2); Pi, Liang-Wen (3); Zhou, Yueming (2); Lu, Peixiang (4)

Author affiliation:(1) Hubei Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan; 430205, China; (2) Wuhan National Laboratory for Optoelectronics and School of Physics, Huazhong University of Science and Technology, Wuhan; 430074, China; (3) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China; (4) Guangdong Intelligent Robotics Institute, Dongguan; 523808, China

Source title:Physical Review A

Abbreviated source title:Phys. Rev. A

Volume:103

Issue:1

Issue date:January 2021

Publication year:2021

Article number:A15

Language:English

ISSN:24699926

E-ISSN:24699934

Document type:Journal article (JA)

Publisher:American Physical Society

Abstract:Attosecond metrology can directly measure attosecond emission time of photoexcited electrons from matter, providing unprecedented understanding of transition processes of electrons from bound to continuum states. However, some fundamental details of the electron dynamics in the entire emission process upon photoexcitation still remain debatable or unknown. The photoemission time delays deduced from attosecond streaking spectroscopy originate from photoelectron propagation in the coupled Coulomb-laser fields, encoding the spatial and spectral information of electrons upon photoexcitation. Here we demonstrate that attosecond photoemission delays can be used to image picometer-resolved photoemission position via a classical model. The electronic dynamics in the laser-assisted single-photon ionization process is fully captured by a quantum path-integral model. We trace the imaged photoemission position to the average position of spatially coherent superposition of electron waves upon photoexcitation and, in particular, predict emission position coinciding with the orbital radius of the ground state of hydrogen-like atoms, in contrast with previous predictions.<br/> © 2021 American Physical Society.

Number of references:40

Main heading:Photoemission

Controlled terms:Photoelectron spectroscopy - Photoionization - Photons - Photoexcitation - Particle beams - Ground state - Electrons

Uncontrolled terms:Attosecond metrology - Coherent superpositions - Electronic dynamics - Hydrogen-like atoms - Photoexcited electrons - Single photon ionization - Spectral information - Transition process

Classification code:701.1 Electricity: Basic Concepts and Phenomena - 741.1 Light/Optics - 801.4 Physical Chemistry - 802.2 Chemical Reactions - 931.3 Atomic and Molecular Physics - 932.1 High Energy Physics

DOI:10.1103/PhysRevA.103.013115

Funding details: Number: T201806, Acronym: -, Sponsor: Hubei Provincial Department of Education;Number: 11627809,11674257,11934006,11947096,12021004, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2020CFA082, Acronym: -, Sponsor: Natural Science Foundation of Hubei Province;Number: 2019B030302003, Acronym: -, Sponsor: Applied Basic Research Key Project of Yunnan;

Funding text:This work was supported by the National Natural Science Foundation of China (Grants No. 11934006, No. 11674257, No. 11627809, No. 12021004, and No. 11947096), Hubei Provincial Department of Education (Grant No. T201806), the Natural Science Foundation of Hubei Province (Grant No. 2020CFA082), and the Guangdong Major Project of Basic and Applied Basic Research (Grant No. 2019B030302003).

Database:Compendex

Accession number:20212810608721

Title:Optical ranging system based on multiple pulse train interference using soliton microcomb

Authors:Zheng, Jihui (1); Wang, Yang (2, 3); Wang, Xinyu (2, 3); Zhang, Fumin (1); Wang, Weiqiang (2); Ma, Xin (1); Wang, Jindong (1); Chen, Jiawei (1); Jia, Linhua (1); Song, Mingyu (1); Yuan, Meiyan (2, 3); Little, Brent (2, 3); Chu, Sai Tek (4); Cheng, Dong (2, 3); Qu, Xinghua (1); Zhao, Wei (2, 3); Zhang, Wenfu (2, 3)

Author affiliation:(1) State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin; 300072, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China; (4) Department of Physics and Materials Science, City University of Hong Kong, Hong Kong, Hong Kong

Corresponding authors:Zhang, Fumin(zhangfumin@tju.edu.cn); Wang, Weiqiang(wwq@opt.ac.cn); Zhang, Wenfu(wfuzhang@opt.ac.cn)

Source title:Applied Physics Letters

Abbreviated source title:Appl Phys Lett

Volume:118

Issue:26

Issue date:June 28, 2021

Publication year:2021

Article number:261106

Language:English

ISSN:00036951

CODEN:APPLAB

Document type:Journal article (JA)

Publisher:American Institute of Physics Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">The multiple pulse train interference (MPTI) ranging system takes advantage of the high accuracy and absolute length measurement capability, but traditional scheme has a large measurement dead zone. In this Letter, we propose a MPTI ranging scheme based on chip-based soliton microcomb to achieve high-precision but no dead-zone measurement. The measurement optical path is improved to solve the problem of cross correlation interference fringe overlap, and a peak fitting algorithm is employed to further improve the measurement accuracy of the system. Using a commercial He-Ne interferometer, a 384 nm precision is obtained in 1.5 m distance measurements. Advantages of the simple optical path, high precision, and no measurement dead zone are expected to realize on-chip integration and provide a solution for precision measurement.<br/></div> © 2021 Author(s).

Number of references:42

Main heading:Solitons

Controlled terms:Optical correlation - Range finding

Uncontrolled terms:Absolute length measurement - Cross correlations - Interference fringe - Measurement accuracy - On-chip integration - Optical ranging - Precision measurement - Ranging systems

Classification code:741.1 Light/Optics

Numerical data indexing:Size 1.50e+00m

DOI:10.1063/5.0054065

Funding details: Number: 18YFZCGX00920, Acronym: -, Sponsor: -;Number: 51675380,51775379,61635013,61675231,61705257,61805277,62075238, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: XDB24030600, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2018YFB2003501,2018YFF0212702, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;Number: 2016353, Acronym: YIPA, Sponsor: Youth Innovation Promotion Association;

Funding text:This work was supported by the National Natural Science Foundation of China (Grant Nos. 51675380, 62075238, 61675231, 51775379, 61635013, 61705257, and 61805277); National Key Research and Development Plan of China (Grant Nos. 2018YFF0212702 and 2018YFB2003501); Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB24030600); Youth Innovation Promotion Association, Chinese Academy of Sciences (Grant No. 2016353); and Key Projects Supported by Science and Technology of Tianjin, China (Grant No. 18YFZCGX00920).

Database:Compendex

Accession number:20213010675818

Title:Perfect Soliton Crystals in the High-Q Microrod Resonator

Authors:Niu, Rui (1, 3); Wan, Shuai (1, 3); Wang, Zheng-Yu (1, 3); Li, Jin (1, 3); Wang, Wei-Qiang (2, 4); Zhang, Wen-Fu (2, 4); Guo, Guang-Can (1, 3); Zou, Chang-Ling (1, 3); Dong, Chun-Hua (1, 3)

Author affiliation:(1) Cas Key Laboratory of Quantum Information, University of Science and Technology of China, Anhui, Hefei; 230026, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics (XIOPM), Cas, Xi'an; 710119, China; (3) Cas Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Anhui, Hefei; 230026, China; (4) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Dong, Chun-Hua(chunhua@ustc.edu.cn)

Source title:IEEE Photonics Technology Letters

Abbreviated source title:IEEE Photonics Technol Lett

Volume:33

Issue:15

Issue date:August 1, 2021

Publication year:2021

Pages:788-791

Article number:9481249

Language:English

ISSN:10411135

E-ISSN:19410174

CODEN:IPTLEL

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">The coherent temporal soliton in optical microresonators has attracted great attention recently. Here, we have fabricated the microrod resonator with Q factor as high as 2 × 108 and demonstrated the dissipative Kerr soliton generation in such a microresonator, by utilizing an auxiliary-laser-assisted thermal response control. In addition, we have changed the pump laser and observed the perfect soliton crystals. With the simulation, we found that the perfect soliton crystals are generated based on the avoided mode crossing, which is affected by the pump resonance and pump power.<br/></div> © 1989-2012 IEEE.

Number of references:46

Main heading:Microresonators

Controlled terms:Q factor measurement - Optical resonators - Solitons - Pumping (laser)

Uncontrolled terms:Kerr solitons - Laser-assisted - Micro resonators - Optical microresonators - Pump laser - Pump power - Temporal solitons - Thermal response

Classification code:741.1 Light/Optics - 741.3 Optical Devices and Systems - 744.1 Lasers, General - 744.7 Laser Components - 942.2 Electric Variables Measurements

DOI:10.1109/LPT.2021.3096645

Funding details: Number: 11874342,11934012,92050109, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2016YFA0301303, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;Number: -, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;

Funding text:Manuscript received April 5, 2021; revised June 22, 2021; accepted July 8, 2021. Date of publication July 12, 2021; date of current version July 22, 2021. This work was supported in part by the National Key Research and Development Program of China under Grant 2016YFA0301303; in part by the National Natural Science Foundation of China under Grant 11934012, Grant 11874342, and Grant 92050109; and in part by the Fundamental Research Funds for the Central Universities. (Corresponding author: Chun-Hua Dong.) Rui Niu, Shuai Wan, Zheng-Yu Wang, Jin Li, Guang-Can Guo, Chang-Ling Zou, and Chun-Hua Dong are with the CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, Anhui 230026, China, and also with the CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China (e-mail: chunhua@ustc.edu.cn).

Database:Compendex

Accession number:20211410162042

Title:Evaluation of compression quality of space-borne interference hyperspectral image

Authors:Zhang, Xiaorong (1); Li, Siyuan (1); Hu, Bingliang (1); Liu, Xuebin (1); Yan, Qiangqiang (1); Li, Yun (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Science, Xi'an; 710119, China

Corresponding author:Zhang, Xiaorong(zhangxiaorong@opt.ac.cn)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11763

Part number:1 of 1

Issue title:Seventh Symposium on Novel Photoelectronic Detection Technology and Applications

Issue date:2021

Publication year:2021

Article number:117633G

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510643611

Document type:Conference article (CA)

Conference name:7th Symposium on Novel Photoelectronic Detection Technology and Applications

Conference date:November 5, 2020 - November 7, 2020

Conference location:Kunming, China

Conference code:167886

Sponsor:Chinese Society for Optical Engineering (CSOE); Science and Technology on Low-light-level Night Vision Laboratory

Publisher:SPIE

Abstract:The data acquired by the space-borne interference hyperspectral imager is a hybrid interferogram cube. For this kind of complicated data, there are many compression schemes for the on-board compression encoder. How to determine the optimal compression scheme and the optimal compression parameters under this compression scheme is crucial to recovering data. This paper proposes three compression schemes for space-borne interference hyperspectral images, which are mixed interferograms, pure interferograms, and fast views, respectively, and performs a compression evaluation. The peak signal-to-noise ratio of the recovered image, minimum quadratic error, and the spectral angle corresponding to the restored spectral curve are used as the measurement indicators to determine the optimal scheme and the optimal compression parameter configuration which are successfully applied to the development of the spectrometer. This paper establishes a scene-rich remote sensing interference hyperspectral image data source, quantitatively evaluates the impact of different compression ratios under different compression schemes, and changes in remote sensing image displacement, guides instrument design and parameter configuration, and lays a good foundation for the data application of space-borne interference hyperspectral images.<br/> © 2021 SPIE

Number of references:14

Main heading:Remote sensing

Controlled terms:Signal to noise ratio - Space optics - Image quality - Image compression - Interferometry - Quality control - Spectroscopy

Uncontrolled terms:Compression quality - Hyperspectral image datas - Hyperspectral imagers - Measurement indicators - Optimal compression - Optimal compression schemes - Peak signal to noise ratio - Remote sensing images

Classification code:656.1 Space Flight - 716.1 Information Theory and Signal Processing - 741.1 Light/Optics - 913.3 Quality Assurance and Control - 941.4 Optical Variables Measurements

DOI:10.1117/12.2586561

Funding details: Number: 61501456, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: XAB2019B26,Y790Q01C01, Acronym: CAS, Sponsor: Chinese Academy of Sciences;

Funding text:This project was funded by the Western Light Project of the Chinese Academy of Sciences (No. XAB2019B26), the HJ-2 satellite whole-satellite ground test system project (No. Y790Q01C01), and the National Natural Science Foundation of China (No. 61501456).

Database:Compendex

Accession number:20213310779846

Title:High-stability three-field TV detection system

Title of translation:高稳定性三视场电视探测系统

Authors:Peng, Jian-Wei (1); Ma, Ying-Jun (1); Chen, Wei-Ning (1); Shi, Kui (1); Zhang, Gao-Peng (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China

Corresponding author:Zhang, Gao-Peng(zhanggaopeng@opt.ac.cn)

Source title:Guangxue Jingmi Gongcheng/Optics and Precision Engineering

Abbreviated source title:Guangxue Jingmi Gongcheng

Volume:29

Issue:7

Issue date:July 2021

Publication year:2021

Pages:1559-1566

Language:Chinese

ISSN:1004924X

CODEN:GJGOF4

Document type:Journal article (JA)

Publisher:Chinese Academy of Sciences

Abstract:<div data-language="eng" data-ev-field="abstract">To meet the strict requirements of stability and consistency of the optical axis for the current three-field TV detection system with a photoelectric search and tracking device, a three-field TV detection system with a rotary switching mechanism was studied. Through the analysis of the system indicators, an optical system for cut-in and cut-out field of view switching was selected, and the structure of the rotary switching mechanism was presented. Based on this, a precise rotating shafting, position-limit mechanism with a powerful neodymium magnet and a high elastic plunger, and worm drive mechanism with self-locking characteristics were designed. The selection process and results of the limit mechanism and the drive mechanism were given. A method of optical axis consistency adjustment with theodolite and cross-reticle was proposed. With this design and adjustment process, a high-stability three-field TV detection system was realized. The test results show that the stability of the optical axis of the M-FOV is less than 8", and the consistency of the optical axis of the three fields of view is within 1 pixel size, which meets the indicator requirements. The results of laboratory and outdoor experiments show that the imaging quality of each field of view of the system is excellent, and the detection range is long, which can meet the requirements of use.<br/></div> © 2021, Science Press. All right reserved.

Number of references:12

Main heading:Optical systems

Controlled terms:System stability - Neodymium alloys

Uncontrolled terms:Detection range - Detection system - Fields of views - Optical-axis consistencies - Outdoor experiment - Switching mechanism - System indicators - Tracking devices

Classification code:547.2 Rare Earth Metals - 741.3 Optical Devices and Systems - 961 Systems Science

DOI:10.37188/OPE.20212907.1559

Database:Compendex

Accession number:20220811682264

Title:Study on assembly technology of primary and secondary mirror system based on truss structure

Authors:Peng, Wang (1); Xing, Song (1); Xiao-Hua, Hou (1); Zhong, Shen (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China

Corresponding author:Peng, Wang

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12070

Part number:1 of 1

Issue title:10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes

Issue date:2021

Publication year:2021

Article number:120700C

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510650152

Document type:Conference article (CA)

Conference name:10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes 2021

Conference date:June 14, 2021 - June 17, 2021

Conference location:Chengdu, China

Conference code:176905

Sponsor:Institute of Optics and Electronics (IOE), Chinese Academy of Sciences; The Chinese Optical Society (COS)

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">According to the assembly requirements of the space camera's primary and secondary mirror system, this paper proposes the assembly process of carbon fiber truss fuselage's primary and secondary mirror system based on adhesive error compensation technology. The process starts from a system point of view, the adhesive bonding of the truss fuselage was unified with the assembly of the primary and secondary mirror system. The adhesive technology was used to compensate the machining errors of the structural parts, and the adhesive bonding of the truss fuselage and the optical axis consistency assembly of primary and secondary mirror system are realized in the process of one adjustment. According to this assembly process idea, the assembly process of primary and secondary mirror system was designed. Firstly, the optical axis of the primary mirror and the optical axis of the secondary mirror were calibrated by the principle of autocollimation, and the optical axis was guided to the cross reticule as the reference for subsequent installation and adjustment. Secondly, in order to realize this process method, the assembly and adjustment platform of the primary and secondary mirror was designed and built. In addition, the factors that affect the assembly precision of the primary and secondary mirror system are analyzed one by one, and the calculation method of system assembly error is obtained. This assembly method has been successfully applied to a space camera. After assembly, the coaxiality between the optical axis of the primary mirror and the optical axis of the secondary mirror is better than 0.02mm, the Angle between the optical axis is better than 10 ", and the wavefront of the primary and secondary mirror system is close to the optical design index. The assembly method presented in this paper provides a technical reference for the assembly of similar large aperture optical machine system.<br/></div> © 2021 SPIE

Number of references:3

Main heading:Carbon fibers

Controlled terms:Cameras - Error compensation - Adhesives - Assembly - Carbon fiber reinforced plastics - Mirrors - Trusses

Uncontrolled terms:Adhesive assembly - Assembly process - Carbon fiber truss - Mirror systems - Optical axis - Optical-axis consistencies - Primary and secondary mirror system - Primary mirrors - Secondary mirror - Space cameras

Classification code:408.2 Structural Members and Shapes - 741.3 Optical Devices and Systems - 742.2 Photographic Equipment - 804 Chemical Products Generally - 817.1 Polymer Products

Numerical data indexing:Size 2.00E-05m

DOI:10.1117/12.2603955

Database:Compendex

Accession number:20220211449156

Title:Design of wide view aerial camera system in low-light

Title of translation:低照度宽幅航空相机系统设计

Authors:Peng, Jianwei (1); Chen, Weining (1); Zhang, Gaopeng (1); Fang, Yao (1); Dong, Sen (1); Yang, Hongtao (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China

Corresponding author:Zhang, Gaopeng

Source title:Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering

Abbreviated source title:Hongwai yu Jiguang Gongcheng Infrared Laser Eng.

Volume:50

Issue:12

Issue date:December 25, 2021

Publication year:2021

Article number:20210312

Language:Chinese

ISSN:10072276

Document type:Journal article (JA)

Publisher:Chinese Society of Astronautics

Abstract:<div data-language="eng" data-ev-field="abstract">In order to meet the requirements of quick acquisition of aerial image information in low light condition, a wide view imaging system which can be adapted to low-light environments was studied. Based on the camera working mode of frame-sweep imaging, the technology route of adopting a large relative aperture and low distortion optical system, combining a low-noise and high-sensitivity CMOS detector with vacuum cooling, and compensating the scanning image motion by high-speed steering mirror was clarified. The design ideas of the mechanical configuration of the camera were explained in detail, and a set of calculation methods of imaging capabilities in low-light which can be applied in engineering were summarized. The basic principle of compensating image motion with steering mirror was studied, and the main frame of the camera was simulated, analyzed and calculated. According to the design and research results, the processing and assembly of the wide view aerial camera in low-light were completed. The camera has a ground sample distance (GSD) of 0.1 meters (height 1 km), and adaptable illumination range of 10-100000 lx, and a large view width of 3 times the height when the speed to height ratio is less than 0.04. The imaging quality of the system is excellent, and test results show that the MTF of the center field of view at 77 lp/mm is greater than 0.45. The images obtained from laboratory and field flight tests are clear, with high contrast and resolution, which can meet the requirements of use. At the same time, the system is 190 mm×140 mm×140 mm in actual size and 2800 g in weight, which is light and small.<br/></div> Copyright ©2021 Infrared and Laser Engineering. All rights reserved.

Number of references:13

Main heading:Optical systems

Controlled terms:Cameras - Mirrors - Antennas

Uncontrolled terms:Aerial camera - Aerial images - Camera systems - Image information - Image motion - Low light - Low light conditions - Quick acquisition - Simulation analysis - Wide view

Classification code:741.3 Optical Devices and Systems - 742.2 Photographic Equipment

Numerical data indexing:Illuminance 1.00E+01lx to 1.00E+05lx, Mass 2.80E+00kg, Size 1.00E+03m, Size 1.00E-01m, Size 1.40E-01m, Size 1.90E-01m

DOI:10.3788/IRLA20210312

Database:Compendex

Accession number:20213110707199

Title:Thermochromic Film Based on VO<inf>2</inf>@SiO<inf>2</inf> Core-shell Nanoparticles

Title of translation:基于VO<inf>2</inf>@SiO<inf>2</inf>核壳纳米粒子的热致变色薄膜

Authors:Wang, Xin (1); Hu, Wenjie (1); Xu, Yao (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China

Source title:Guangzi Xuebao/Acta Photonica Sinica

Abbreviated source title:Guangzi Xuebao

Volume:50

Issue:7

Issue date:July 25, 2021

Publication year:2021

Article number:0731001

Language:Chinese

ISSN:10044213

CODEN:GUXUED

Document type:Journal article (JA)

Publisher:Chinese Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">A thermochromic film was prepared with VO<inf>2</inf>@SiO<inf>2</inf> core-shell nanoparticles to enhance the visible light transmittance and weather resistance of thermochromic film and also decrease the agglomeration of VO<inf>2</inf> nanoparticles prepared by thermal decomposition method. VO(OH)<inf>2</inf>@SiO<inf>2</inf> core-shell nanoparticles were prepared by coating SiO<inf>2</inf> layer on the surface of VO(OH)<inf>2</inf> nanoparticles via the surface electric interaction between nagatively charged VO(OH)<inf>2</inf> nanoparticles and positively charged NH<inf>2 </inf>groups of aminopropyltriethoxylsilane. Then a normal heat treatment of VO(OH)<inf>2</inf>@SiO<inf>2 </inf>under Ar atmosphere was utilized to obtain VO<inf>2</inf>@SiO<inf>2</inf> nanoparticles. Subsequently optical film with good thermochromic property was prepared by coating the resin dispersion of VO<inf>2</inf>@SiO<inf>2 </inf>on well cleaned glass. The thermochromic property and the weather resistance of thermochromic film were studied. From TEM images, we find that SiO<inf>2</inf> shell prevents the agglomeration of VO(OH)<inf>2</inf> during heat treatment. Research on the optical properties of the film shows that the SiO<inf>2</inf> and air of low refractive index can improve the optical properties of thermochromic films, and when the mass fraction of VO<inf>2</inf>@SiO<inf>2</inf> nanoparticles is 10wt%, the optical performance of the composite film is the best. The protective effect of the SiO<inf>2</inf> shell to the VO<inf>2</inf> core obviously improves the oxidation resistance and corrosion resistance of VO<inf>2</inf> in damp heating and acidic environment, which makes longer life of VO<inf>2</inf> thermochromic film.<br/></div> © 2021, Science Press. All right reserved.

Number of references:25

Main heading:Shells (structures)

Controlled terms:Film preparation - Silicon - Optical films - Decomposition - Heat treatment - Refractive index - SiO2 nanoparticles - Silica nanoparticles - Vanadium dioxide - Agglomeration - Composite films

Uncontrolled terms:Electric interaction - Low refractive index - Optical performance - Positively charged - Thermal decomposition methods - Thermochromic properties - Visible light transmittances - Weather resistance

Classification code:408.2 Structural Members and Shapes - 537.1 Heat Treatment Processes - 549.3 Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 761 Nanotechnology - 802.2 Chemical Reactions - 802.3 Chemical Operations - 804.2 Inorganic Compounds

DOI:10.3788/gzxb20215007.0731001

Funding details: Number: u1530148, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:item：National Natural Science Foundation of China（No. u1530148）

Database:Compendex

Accession number:20210509874612

Title:Applications and development of micro-or nano-metric multi degree of freedom adjusting displacement scaling mechanisms for primary mirror

Authors:Hu, Bin (1); Li, Chuang (2); Zhu, Qing (1); Ye, Jing (1, 2)

Author affiliation:(1) Xian Institute of Optics and Precision Mechanics, 17 Xinxi Road, Xian, Shaanxi; 710119, China; (2) University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing; 100049, China

Corresponding author:Hu, Bin(lenovosk@sina.cn)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11761

Part number:1 of 1

Issue title:Fourth International Conference on Photonics and Optical Engineering

Issue date:2021

Publication year:2021

Article number:117610R

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510643574

Document type:Conference article (CA)

Conference name:4th International Conference on Photonics and Optical Engineering

Conference date:October 15, 2020 - October 16, 2020

Conference location:Xi'an, China

Conference code:166676

Publisher:SPIE

Abstract:For large aperture and high-resolution space optical cameras, the focusing requirements caused by different resolution requirements, or the requirements for the segmented primary mirror for deployable telescopes or on-orbit assembly space telescopes, the micro-or nano-metric multi degree of freedom adjusting of the primary mirror or the segment mirror is one of the inevitable development trends of the active optical system. According to the different degrees of freedom involved in the primary mirror adjustment, the micro-or nano-metric multi degree of freedom adjusting displacement scaling mechanisms of the monolithic and segmented primary mirror are studied. The development history and structural characteristics of multi degree of freedom adjusting displacement scaling mechanisms including rigid lever type, gear deceleration type, hydraulic mechanism type and compliant hinge type, as well as their research status and application fields, are introduced. The performance characteristics and applications of various displacement scaling mechanisms are analyzed and compared. Finally, according to the application requirements of space telescopes in the future, the development trend of multi degree of freedom (DOF) adjusting displacement scaling mechanism for segmented primary mirror is proposed.<br/> © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

Number of references:17

Main heading:Degrees of freedom (mechanics)

Controlled terms:Optical systems - Mechanisms - Space telescopes - Gears - Mirrors - Ultrasonic devices

Uncontrolled terms:Application requirements - Deployable telescopes - Development history - Different resolutions - Multi degree-of-freedom - Performance characteristics - Segmented primary mirrors - Structural characteristics

Classification code:601.2 Machine Components - 601.3 Mechanisms - 741.3 Optical Devices and Systems - 753.2 Ultrasonic Devices - 931.1 Mechanics

DOI:10.1117/12.2586744

Database:Compendex

Accession number:20213510833159

Title:Optical coherence tomography-surveilled laser ablation using multifunctional catheter and 355-nm optical pulses

Authors:Kang, Jiqiang (1); Zhu, Rui (2, 3); Li, Jianan (3, 4); Liu, Haiping (3); Ma, Xiuquan (5); Tao, Ling (6); Sun, Yunxu (1)

Author affiliation:(1) School of Electronic and Information Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen; 518055, China; (2) International Graduate School at Shenzhen, Tsinghua University, Shenzhen; 518055, China; (3) Shenzhen Vivolight Medical Device & Technology Co., Ltd., Shenzhen; 518055, China; (4) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; Shaanxi; 710119, China; (5) School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Hubei; Wuhan; 430074, China; (6) Department of Cardiology, Xijing Hospital, Fourth Military Medical University, No. 15 Changle West Road, Xi'an; Shaanxi; 710032, China

Corresponding author:Sun, Yunxu(sunyunxu@hit.edu.cn)

Source title:Optics Communications

Abbreviated source title:Opt Commun

Volume:501

Issue date:December 15, 2021

Publication year:2021

Article number:127364

Language:English

ISSN:00304018

CODEN:OPCOB8

Document type:Journal article (JA)

Publisher:Elsevier B.V.

Abstract:<div data-language="eng" data-ev-field="abstract">An optical coherence tomography (OCT)-monitored laser ablation system is presented in this study. The laser ablation subsystem is constructed using the third harmonic output of a Nd:YAG laser source operating at a 355-nm optical wavelength with a single pulse energy greater than 160 mJ and a 1–10 Hz tunable repetition rate. The imaging subsystem is a typical M-mode swept-source OCT system. Moreover, a type of all-fiber multifunctional integrated catheter is demonstrated. The ablation catheter consists of a fiber bundle including 41 multi-mode fibers with an outer diameter of 0.9 mm. A forward-viewing OCT imaging probe is inserted into the ablation catheter for M-mode imaging. The performance of the system is demonstrated by OCT surveillance of the laser ablation process using expanded polystyrene foam as the sample. The OCT system can be used to record the ablation process and simultaneously count the laser ablation duration. This study proposes an effective potential technique to surveil material laser ablation processes, especially in situations where bulky optics are prohibited and all-fiber devices are required.<br/></div> © 2021 Elsevier B.V.

Number of references:50

Main heading:Optical tomography

Controlled terms:Fibers - Catheters - Laser ablation - Neodymium lasers - Yttrium aluminum garnet - Pulse repetition rate

Uncontrolled terms:Ablation catheters - Coherence tomography - Harmonic outputs - Laser ablation systems - Laser sources - Lasers ablations - Nd:YAG laser - Optical- - Third harmonic - Tomography system

Classification code:462.1 Biomedical Equipment, General - 641.2 Heat Transfer - 741.3 Optical Devices and Systems - 744.1 Lasers, General - 744.4 Solid State Lasers - 744.8 Laser Beam Interactions - 804.2 Inorganic Compounds

Numerical data indexing:Energy 1.60E-01J, Frequency 1.00E+01Hz, Size 3.55E-07m, Size 9.00E-04m

DOI:10.1016/j.optcom.2021.127364

Funding details: Number: 81927805, Acronym: NNSFC, Sponsor: National Natural Science Foundation of China;Number: JCYJ20160427183803458, Acronym: -, Sponsor: Science and Technology Planning Project of Shenzhen Municipality;Number: JCYJ20190806142610885, Acronym: -, Sponsor: Shenzhen Fundamental Research Program;

Funding text:This work was partially supported by grants from the National Natural Science Foundation of China (Grant No. 81927805 ), the Shenzhen Municipal Science and Technology Plan Project , China (Grant No. JCYJ20160427183803458 ), and the Shenzhen Fundamental Research Program , China (Grant No. JCYJ20190806142610885 ).

Database:Compendex

Accession number:20214511111237

Title:Design of video image acquisition and SDI display in large field of view

Title of translation:大视场视频图像采集及SDI显示设计

Authors:Zhang, Yongkang (1); Chen, Ping (1); Meng, Xiangsheng (1); Tian, Yan (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China

Source title:Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering

Abbreviated source title:Hongwai yu Jiguang Gongcheng Infrared Laser Eng.

Volume:50

Issue date:October 25, 2021

Publication year:2021

Article number:20200211

Language:Chinese

ISSN:10072276

Document type:Journal article (JA)

Publisher:Chinese Society of Astronautics

Abstract:<div data-language="eng" data-ev-field="abstract">According to the real demand of image real-time storage display and real-time tracking display for large field of view and high-speed camera, which was with Camera Link interface, a large field of view image acquisition and SDI display system based on FPGA was designed. FPGA EP2S90F1020 of Altera Company as the core processor and two pieces of SDRAM MT48LC4M32 were used. A method of image real-time zooming based on FPGA and real-time conversion of Bayer format color image to SDI display was proposed. The real-time display of large field of view color video image, which was Camera Link interface, was realized on SDI video image. The experimental results show that the design method can convert the 2 048×2 048, 100 Hz video image of Camera Link interface into 1 920×1 080, 25 Hz or 1 280×720, 25 Hz, or 720×576, 50 Hz SDI display in real time. In the FPGA environment, the whole image processing time is 8.7 ms, which meets the real-time requirements of the system, and provides an effective implementation method for the real-time display of large field of view video image in embedded system.<br/></div> © 2021, Editorial Board of Journal of Infrared and Laser Engineering. All right reserved.

Number of references:11

Main heading:Field programmable gate arrays (FPGA)

Controlled terms:Dynamic random access storage - High speed cameras

Uncontrolled terms:Baye - Camera links - Camera-link interfaces - HD-SDI - Large field of views - Real time display - Real time tracking - Real- time - Tracking displays - Video image

Classification code:721.2 Logic Elements - 722.1 Data Storage, Equipment and Techniques - 742.2 Photographic Equipment

Numerical data indexing:Frequency 1.00E+02Hz, Frequency 2.50E+01Hz, Frequency 5.00E+01Hz, Time 8.70E-03s

DOI:10.3788/IRLA20200211

Database:Compendex

Accession number:20212010346833

Title:Analysis of a wavelength-tunable D-shaped photonic crystal fiber filter with broad bandwidth

Authors:Meng, Xiaojian (1); Li, Jianshe (1, 2, 3); Guo, Ying (1); Du, Huijing (1); Liu, Yundong (1); Li, Shuguang (1); Guo, Haitao (2); Bi, Weihong (3)

Author affiliation:(1) State Key Laboratory of Metastable Materials Science & Technology, Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao; 066004, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences (CAS), Xi'an; 710119, China; (3) Key Laboratory for Special Fiber and Fiber Sensor of Hebei Province, School of Information Science and Engineering, Yanshan University, Qinhuangdao; 066004, China

Corresponding author:Li, Jianshe(jianshelee@ysu.edu.cn)

Source title:Journal of the Optical Society of America B: Optical Physics

Abbreviated source title:J Opt Soc Am B

Volume:38

Issue:5

Issue date:May 2021

Publication year:2021

Pages:1525-1531

Language:English

ISSN:07403224

E-ISSN:15208540

CODEN:JOBPDE

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">This paper has designed a D-shaped photonic crystal fiber filter based on surface plasmon resonance. The singlepolarization filtering performance is analyzed systematically by the finite element method. It is found that the structural optimization process will modify the refractive index of the fundamental mode and the surface plasmon polarization mode, which results in a shift of the resonance wavelength. The proposed filter is able to indicate the wavelength-tunable function in the ranges of 1250-1350 nm and 1550-1750 nm by two methods.Moreover, at the communication windows of 1310 nm and 1550 nm, the corresponding filtering bandwidths are 170 and 550 nm, respectively. The flow chart of filter preparation reported in the study is promising for use in the field of optical devices.<br/></div> © 2021 Optical Society of America.

Number of references:26

Main heading:Structural optimization

Controlled terms:Refractive index - Surface plasmon resonance - Bandwidth - Crystal whiskers - Photonic crystal fibers

Uncontrolled terms:1550 nm - Broad bandwidths - Filtering performance - Fundamental modes - Resonance wavelengths - Surface plasmon polarizations - Wavelength tunable

Classification code:716.1 Information Theory and Signal Processing - 741.1 Light/Optics - 741.1.2 Fiber Optics - 921.5 Optimization Techniques - 933.1.1 Crystal Lattice - 951 Materials Science

Numerical data indexing:Size 1.25e-06m to 1.35e-06m, Size 1.31e-06m, Size 1.55e-06m, Size 1.55e-06m to 1.75e-06m, Size 1.70e-07m, Size 5.50e-07m

DOI:10.1364/JOSAB.421792

Funding details: Number: B2018003008, Acronym: -, Sponsor: -;Number: 12074331, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: F2020203050, Acronym: -, Sponsor: Natural Science Foundation of Hebei Province;Number: SKLST201908, Acronym: SKLTOP, Sponsor: State Key Laboratory of Transient Optics and Photonics;Number: 2019YFB2204001, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Funding text:Funding. Open Research Fund of State Key Laboratory of Transient Optics and Photonics (SKLST201908); Postdoctoral Preferred Funding Research Project of Hebei Province (B2018003008); Program of the Natural Science Foundation of Hebei Province (F2020203050); National Natural Science Foundation of China (12074331); National Key Research and Development Program of China (2019YFB2204001).Open Research Fund of State Key Laboratory of TransientOptics and Photonics (SKLST201908); Postdoctoral Preferred Funding Research Project of Hebei Province (B2018003008); Program of the Natural Science Foundation of Hebei Province (F2020203050); National Natural Science Foundation of China (12074331); National Key Research and Development Program of China (2019YFB2204001).

Database:Compendex

Accession number:20214811222111

Title:Continuous blood pressure monitoring based on wearable optical fiber interferometry wristband

Authors:Chen, Xiao (1); Xu, Wei (2, 3); Dong, Bo (4); Yu, Changyuan (6, 7); Zhao, Wei (2, 3, 5); Wang, Yishan (2, 3, 5); Sun, Wenye (8)

Author affiliation:(1) School of Electronic and Information Engineering, Soochow University, Suzhou; 21513, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China; (4) College of New Materials and New Energy, Shenzhen Technology University, Shenzhen; 518118, China; (5) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China; (6) The Hong Kong Polytechnic University, Shenzhen Research Institute, Guangdong, Shenzhen, China; (7) Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong; (8) The Second Affiliated Hospital of Soochow University, Suzhou; 215000, China

Corresponding authors:Dong, Bo(dbo1978@163.com); Yu, Changyuan(changyuan.yu@polyu.edu.hk)

Source title:Optics InfoBase Conference Papers

Abbreviated source title:Opt. InfoBase Conf. Pap

Part number:1 of 1

Issue title:Optoelectronics and Communications Conference, OECC 2021

Issue date:2021

Publication year:2021

Article number:JS3F.12

Language:English

ISBN-13:9781557528209

Document type:Conference article (CA)

Conference name:26th Optoelectronics and Communications Conference, OECC 2021

Conference date:July 3, 2021 - July 7, 2021

Conference location:Virtual, Online, China

Conference code:174150

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">We demonstrate a wearable optical fiber interferometry wristband which is used for continuous blood pressure monitoring. The pulse transit time extracted from the pulse wave can be used to established the blood pressure estimation model.<br/></div> © OSA 2021, © 2021 The Author(s)

Number of references:5

Main heading:Interferometry

Controlled terms:Blood - Optical fibers - Wearable technology - Blood pressure

Uncontrolled terms:Blood pressure estimation - Continuous blood pressure monitoring - Estimation models - Optical-fiber interferometry - Pulse transit time - Pulse-wave

Classification code:461.2 Biological Materials and Tissue Engineering - 461.9 Biology - 741.1.2 Fiber Optics - 941.4 Optical Variables Measurements

Funding details: Number: 15200718, Acronym: -, Sponsor: -;Number: 61971372,U1701661, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: -, Acronym: 研究資助局, Sponsor: Research Grants Council, University Grants Committee;Number: SDFEYQN2020, Acronym: -, Sponsor: Second Affiliated Hospital of Soochow University;

Funding text:This work was supported by the Research Grants Council, University Grants Committee of Hong Kong (Grant 15200718) and the National Natural Science Foundation of China (U1701661, 61971372), the Advanced Research Fund of the Second Affiliated Hospital of Soochow University (Grant SDFEYQN2020).

Database:Compendex

Accession number:20220811674432

Title:Figure error of optical elements induced aberrations of optical system

Authors:Pang, Zhihai (1); He, Tianbin (1)

Author affiliation:(1) Space Optics Laboratory, Xi'an Institute of Optics and Precision Mechanics, CAS, Shanxi, Xi'an; 710119, China

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12071

Part number:1 of 1

Issue title:10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing and Metrology Technologies

Issue date:2021

Publication year:2021

Article number:120710X

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510650176

Document type:Conference article (CA)

Conference name:10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing and Metrology Technologies 2021

Conference date:June 14, 2021 - June 17, 2021

Conference location:Chengdu, China

Conference code:176906

Sponsor:Institute of Optics and Electronics (IOE), Chinese Academy of Sciences; The Chinese Optical Society (COS)

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">The optical element's figure error can be express as Fringe Zernike polynomial and vector form, based on the vector wavefront aberration theory, the figure error of optical element induced aberration's characteristic of optical system has been analyses in this paper. The figure error on stop aperture affects all the field angles equally and induced the same type aberration as figure error. If the surface of optical element is not the pupil of optical system, the aberration observed in the focal plane is different from the figure error itself, it will not only induced the same type aberration as figure error but also induced lower order aberration in the optical system, the relationship between aberration and field of view is different and the location zero for the lower order aberration always reside at the center of the field of view.<br/></div> © COPYRIGHT SPIE.

Number of references:10

Main heading:Optical systems

Controlled terms:Errors - Wavefronts - Aberrations

Uncontrolled terms:Aberration theory - Field angle - Field of views - Figure error - Focal Plane - Low order - Vector wavefront aberration - Wavefront aberrations - Zernike polynomials

Classification code:741.3 Optical Devices and Systems

DOI:10.1117/12.2604752

Database:Compendex

Accession number:20224012832621

Title:Continuous Blood Pressure Monitoring Based on Wearable Optical Fiber Interferometry Wristband

Authors:Chen, Xiao (1); Xu, Wei (2, 3); Dong, Bo (4); Yu, Changyuan (6, 7); Zhao, Wei (2, 3, 5); Wang, Yishan (2, 3, 5); Sun, Wenye (8)

Author affiliation:(1) School of Electronic and Information Engineering, Soochow University, Suzhou; 21513, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China; (4) College of New Materials and New Energy, Shenzhen Technology University, Shenzhen; 518118, China; (5) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China; (6) The Hong Kong Polytechnic University Shenzhen Research Institute, Guangdong, Shenzhen, China; (7) Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong; (8) The Second Hospital of Soochow University, Suzhou; 215000, China

Corresponding authors:Dong, Bo(dbo1978@163.com); Yu, Changyuan(changyuan.yu@polyu.edu.hk)

Source title:2021 Opto-Electronics and Communications Conference, OECC 2021

Abbreviated source title:Opto-Electron. Commun. Conf., OECC

Part number:1 of 1

Issue title:2021 Opto-Electronics and Communications Conference, OECC 2021

Issue date:2021

Publication year:2021

Language:English

ISBN-13:9781943580927

Document type:Conference article (CA)

Conference name:2021 Opto-Electronics and Communications Conference, OECC 2021

Conference date:July 3, 2021 - July 7, 2021

Conference location:Hong Kong, Hong kong

Conference code:182432

Publisher:Institute of Electrical and Electronics Engineers Inc.

Number of references:5

Main heading:Interferometry

Controlled terms:Blood - Blood pressure - Optical fiber communication - Optical fibers - Wearable sensors

Uncontrolled terms:Biology and medicine - Blood pressure estimation - Continuous blood pressure monitoring - Estimation models - Fiber-optical sensors - Fibre-optical sensors - Optical-fiber interferometry - Pulse transit time - Pulse-wave

Classification code:461.2 Biological Materials and Tissue Engineering - 461.9 Biology - 717.1 Optical Communication Systems - 741.1.2 Fiber Optics - 941.4 Optical Variables Measurements

Database:Compendex

Accession number:20220211444608

Title:Alignment control in off-Axis Gregorian system with reverse optimization method

Authors:Yin, Yamei (1); Fu, Xing (1); Lei, Yu (1); Cao, Mingqiang (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; Shaanxi; 710119, China

Corresponding author:Yin, Yamei(yinyamei@opt.ac.cn)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12069

Part number:1 of 1

Issue title:AOPC 2021: Novel Technologies and Instruments for Astronomical Multi-Band Observations

Issue date:2021

Publication year:2021

Article number:1206915

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510650138

Document type:Conference article (CA)

Conference name:2021 Applied Optics and Photonics China: Novel Technologies and Instruments for Astronomical Multi-Band Observations, AOPC 2021

Conference date:June 20, 2021 - June 22, 2021

Conference location:Beijing, China

Conference code:175885

Sponsor:Chinese Society for Optical Engineering

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">Off-Axis refractive system with the noticeable advantages such as high resolution, large view field and central obscuration removed, has been one of the powerful systems for space astronomical telescopes in recent years. However, misalignment errors and surface error of mirrors are significant especially in the alignment progress of off-Axis reflective telescope with large aperture. Computer aided assembling (CAA) jointly provide a robust misalignment correction method to ensure the accurate alignment of telescope. In this paper, system aberration of misalignment coaxial system with two mirrors is analyzed in detail, moreover, the off-Axis system is studied further, especially in the off-Axis Gregorian system. And the feasibility of correction values solution about off-Axis refractive system is discussed. Both the simulation and experiment results demonstrate the feasibility of the proposed alignment method and high accuracy has been achieved. In the testing off-Axis Gregorian system, the primary mirror is paraboloid with 1200 mm diameter, 210 mm off-Axis distance, and the second mirror is ellipsoid with off-Axis distance 129.0 mm, focal length 425 mm and 2125 mm, respectively. For the testing off-Axis Gregorian system, the RMS value of primary mirror and second mirror are 0.021 λ and 0.027 λ (λ = 0.6328 nm), and the testing optimization result of system wavefront aberration with RMS value is better than 0.058 λ is achieved. The reverse optimization method testing can achieve high-Accuracy measurement ability, which provides efficient and flexible way for the off axis refractive system from various types of elements with complex surfaces.<br/></div> © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

Number of references:19

Main heading:Alignment

Controlled terms:Aberrations - Adaptive optics - Electromagnetic wave attenuation - Mirrors - Optical testing - Wavefronts

Uncontrolled terms:Active Optics - Correction method - Gregorian - Off-axis - Off-axis refractive system - Optimization method - Refractive systems - Reverse optimization - Reverse optimization correction method - Wavefront aberrations

Classification code:601.1 Mechanical Devices - 711 Electromagnetic Waves - 741.1 Light/Optics - 741.3 Optical Devices and Systems

Numerical data indexing:Size 1.20E+00m, Size 1.29E-01m, Size 2.10E-01m, Size 2.125E+00m, Size 4.25E-01m, Size 6.328E-10m

DOI:10.1117/12.2606822

Database:Compendex

Accession number:20212810609192

Title:Dual Mode High Speed Uncooled Short Wave Infrared Camera Based on FPGA (Open Access)

Authors:Liu, Qing (1); Wang, Huawei (1); Bian, He (1); Wang, Hua (1)

Author affiliation:(1) Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Shaanxi, Xi'an; 710119, China

Corresponding author:Liu, Qing(optliuqing@opt.ac.cn)

Source title:Journal of Physics: Conference Series

Abbreviated source title:J. Phys. Conf. Ser.

Volume:1952

Part number:3 of 4

Issue:3

Issue title:2021 Asia-Pacific Conference on Image Processing, Electronics and Computers, IPEC 2021 - 2. Electronics and Electrical Engineering

Issue date:June 29, 2021

Publication year:2021

Article number:032042

Language:English

ISSN:17426588

E-ISSN:17426596

Document type:Conference article (CA)

Conference name:2021 Asia-Pacific Conference on Image Processing, Electronics and Computers, IPEC 2021

Conference date:April 14, 2021 - April 16, 2021

Conference location:Dalian, Virtual, China

Conference code:169882

Publisher:IOP Publishing Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">This paper introduces a short-wave infrared camera logic design based on FPGA. The hardware design adopts the architecture of Sofradir Tecless SWIR detector SW640+Xilinx FPGA xc4vsx55, which has a dual working mode of 640 512 at 25 FPS and 64 48 at 4000 FPS. The function of high precision target tracking can be realized by high frequency capture of laser signal. In this design, the non-uniform correction coefficient table in SDRAM cache Flash is controlled by FPGA to correct the image of full resolution mode, and the table of 64 48 is cached by Bram in FPGA to achieve fast image correction and processing. The exposure time is controlled by the external synchronous signal, and the 14 bit precision image data are collected by four ADCs for restoration. The output data is processed by image bad point correction, non-uniform correction, median filtering, histogram equalization, and then the image is packaged and sent by the specified protocol.<br/></div> © Published under licence by IOP Publishing Ltd.

Number of references:4

Main heading:Field programmable gate arrays (FPGA)

Controlled terms:Median filters - Integrated circuit design - Infrared radiation - Target tracking - Infrared devices

Uncontrolled terms:Correction coefficients - Full resolution modes - High frequency HF - Histogram equalizations - Image correction - Median filtering - Short wave infrared - Synchronous signals

Classification code:703.2 Electric Filters - 714.2 Semiconductor Devices and Integrated Circuits - 716.1 Information Theory and Signal Processing - 721.2 Logic Elements - 741.1 Light/Optics

DOI:10.1088/1742-6596/1952/3/032042

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20213510845105

Title:Research on the properties of HfO<inf>2</inf>optical films prepared with APS assisted electron beam evaporation deposition

Authors:Pan, Yong-Gang (1); Liu, Zheng (1); Li, Mian (1); Liu, Wen-Cheng (1); Bai, Long (1); Zhang, Si-Bao (1); Luo, Chang-Xin (1); Zhang, Chun-Juan (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, Shaanxi; 710119, China

Corresponding author:Pan, Yong-gang(pyg_optics@163.com)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11912

Part number:1 of 1

Issue title:Pacific Rim Laser Damage 2021: Optical Materials for High-Power Lasers

Issue date:2021

Publication year:2021

Article number:1191207

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510646834

Document type:Conference article (CA)

Conference name:Pacific Rim Laser Damage 2021: Optical Materials for High-Power Lasers

Conference date:May 23, 2021 - May 25, 2021

Conference location:Hangzhou, China

Conference code:171344

Sponsor:Chinese Laser Press; Hangzhou Institute for Advanced Study

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">HfO2 thin films are widely used in laser system because of its superior optical and mechanical properties, especially high laser induced damage threshold. In this paper, single-layer HfO2 thin films were prepared by APS plasma assisted electron beam evaporation deposition. The effects of oxygen charging of electron gun, baking temperature, discharge current of APS source and bias voltage of APS source on optical properties, surface roughness, standing wave electric filed and laser induced damage threshold of HfO2 thin films were studied by orthogonal experiment. Experiment and analysis results showed that the characteristics of HfO2 thin films are closely related to the oxygen charging of electron gun, baking temperature and APS assisted processing parameters. Especially, baking temperature, oxygen charging of electron gun and bias voltage of APS source have great influence on laser induced damage threshold. Through the analysis of experimental date, the optimal combination of process parameters for APS assisted electron beam evaporation of HfO2 optical films were obtained.<br/></div> © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

Number of references:13

Main heading:Thin films

Controlled terms:Evaporation - Laser damage - Oxygen - Hafnium oxides - Optical films - Electron beams - Optical properties - Physical vapor deposition - Electrons - Film preparation - Surface roughness

Uncontrolled terms:Assisted processing - Electron beam evaporation - Electron beam evaporation depositions - Experiment and analysis - Laser induced damage thresholds - Optical and mechanical properties - Optimal combination - Orthogonal experiment

Classification code:741.1 Light/Optics - 741.3 Optical Devices and Systems - 744.8 Laser Beam Interactions - 802.3 Chemical Operations - 804 Chemical Products Generally - 931.2 Physical Properties of Gases, Liquids and Solids

DOI:10.1117/12.2602069

Database:Compendex

Accession number:20211710253695

Title:Research on Auto-focusing Method Based on Pulse Coupled Neural Network (Open Access)

Authors:Chen, Taoyu (1); Wang, Huawei (1); Cao, Jianzhong (1)

Author affiliation:(1) Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, Shanxi; 710119, China

Corresponding author:Wang, Huawei(whw@opt.ac.cn)

Source title:Journal of Physics: Conference Series

Abbreviated source title:J. Phys. Conf. Ser.

Volume:1848

Part number:1 of 1

Issue:1

Issue title:2021 4th International Conference on Advanced Algorithms and Control Engineering, ICAACE 2021

Issue date:April 13, 2021

Publication year:2021

Article number:012158

Language:English

ISSN:17426588

E-ISSN:17426596

Document type:Conference article (CA)

Conference name:2021 4th International Conference on Advanced Algorithms and Control Engineering, ICAACE 2021

Conference date:January 29, 2021 - January 31, 2021

Conference location:Sanya, Virtual, China

Conference code:168420

Publisher:IOP Publishing Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">The key to automatic focusing method based on image processing is to construct a fast and accurate focus quality evaluation function. The method in this article introduces Pulse Coupled Neural Network processing. Using the characteristics of the network, through the enhanced image, the grayscale sum can be conveniently used to characterize clarity, thereby simplifying calculations and enhancing the real-time performance of focus control.<br/></div> © Published under licence by IOP Publishing Ltd.

Number of references:8

Main heading:Image enhancement

Controlled terms:Quality control - Neural networks

Uncontrolled terms:Auto-focusing - Automatic focusing - Focus control - Gray scale - Pulse coupled neural network - Quality evaluation - Real time performance

Classification code:913.3 Quality Assurance and Control

DOI:10.1088/1742-6596/1848/1/012158

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20224012832623

Title:Beat-to-Beat Heart Rate Estimation from MZI-BCG Signal Based on Hierarchical Clustering

Authors:Zeng, Huaili (1); Xu, Wei (2, 3); Dong, Bo (4); Yu, Changyuan (6, 7); Zhao, Wei (2, 3, 5); Wang, Yishan (2, 3, 5); Sun, Wenye (8)

Author affiliation:(1) School of Electronic and Information Engineering, Soochow University, Suzhou; 21513, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China; (4) College of New Materials and New Energy, Shenzhen Technology University, Shenzhen; 518118, China; (5) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China; (6) The Hong Kong Polytechnic University Shenzhen Research Institute, Guangdong, Shenzhen, China; (7) Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong; (8) The Second Hospital of Soochow University, Suzhou; 215000, China

Corresponding authors:Dong, Bo(dbo1978@163.com); Yu, Changyuan(changyuan.yu@polyu.edu.hk)

Source title:2021 Opto-Electronics and Communications Conference, OECC 2021

Abbreviated source title:Opto-Electron. Commun. Conf., OECC

Part number:1 of 1

Issue title:2021 Opto-Electronics and Communications Conference, OECC 2021

Issue date:2021

Publication year:2021

Language:English

ISBN-13:9781943580927

Document type:Conference article (CA)

Conference name:2021 Opto-Electronics and Communications Conference, OECC 2021

Conference date:July 3, 2021 - July 7, 2021

Conference location:Hong Kong, Hong kong

Conference code:182432

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">An algorithm is proposed in this paper to estimate the beat-to-beat heart rate based on BCG signal derived from Mach-Zehnder Interferometer with hierarchical clustering and matched-filtering.<br/></div> © 2021 OSA.

Number of references:3

Main heading:Heart

Controlled terms:Optical fiber communication - Optical fibers

Uncontrolled terms:Heart-rate - Hier-archical clustering - Hierarchical Clustering - Matched filtering - Rate estimation

Classification code:461.2 Biological Materials and Tissue Engineering - 717.1 Optical Communication Systems - 741.1.2 Fiber Optics

Database:Compendex

Accession number:20210209767610

Title:Electromagnetic compatibility design of hyperspectral remote sensing high-speed imaging circuit

Title of translation:高光谱遥感高速成像电路电磁兼容设计

Authors:Liu, Yongzheng (1); Liu, Xuebin (1); Liu, Wenlong (1); Zhang, Xin (1); Chen, Xiaolai (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi'an; 710119, China

Source title:Xi Tong Gong Cheng Yu Dian Zi Ji Shu/Systems Engineering and Electronics

Abbreviated source title:Xi Tong Cheng Yu Dian Zi Ji Shu/Syst Eng Electron

Volume:43

Issue:1

Issue date:January 2021

Publication year:2021

Pages:26-32

Language:Chinese

ISSN:1001506X

CODEN:XGYDEM

Document type:Journal article (JA)

Publisher:Chinese Institute of Electronics

Abstract:In the field of hyperspectral remote sensing imaging, the demand of indicators for hyperspectral remote resolution, hyperspectral resolution and large width of imaging loads are improved. To solve the problem that the electromagnetic interference (EMI) of the high-speed electronics of spaceborne hyperspectral imaging is becoming more and more intensive, the target design method to enhance the electromagnetic compatibility (EMC) capability of the spaceborne hyperspectral imager is proposed, and the implementation of the load on a specific series of high resolution hyperspectral imager verified the effectiveness of the targeted design. In order to seek the theoretical methods and technical implementation methods of EMI design for high-speed hyperspectral imagers, the useful explorations is made to provide a useful reference for the design of other spaceborne high-speed imaging loads for remote sensing.<br/> © 2021, Editorial Office of Systems Engineering and Electronics. All right reserved.

Number of references:26

Main heading:Timing circuits

Controlled terms:Image enhancement - Electromagnetic compatibility - Design - Hyperspectral imaging - Electromagnetic pulse - Remote sensing - Spectroscopy

Uncontrolled terms:High resolution - High speed imaging - High-speed electronics - HyperSpectral - Hyperspectral imagers - Hyperspectral remote sensing - Technical implementation - Theoretical methods

Classification code:701 Electricity and Magnetism - 711.1 Electromagnetic Waves in Different Media - 713.4 Pulse Circuits - 746 Imaging Techniques

DOI:10.3969/j.issn.1001-506X.2021.01.04

Database:Compendex

Accession number:20210509855597

Title:Laser-induced fluorescence and its effect on the damage resistance of fluoride-containing phosphate-based glasses

Authors:Li, Shengwu (1, 2); Yang, Yanqiang (3); Song, Yunfei (3); Wan, Rui (1, 2); Ma, Yuan (1, 2); Peng, Bo (1, 2); Zhang, Guangwei (4); Wang, Pengfei (1, 2)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences (CAS), Xi'an; Shaanxi; 710119, China; (2) Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing; 100049, China; (3) National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang; 621900, China; (4) Zhejiang Fountain Aptitude Technology Inc., Hangzhou; 310051, China

Corresponding author:Wang, Pengfei(pfwang@opt.ac.cn)

Source title:Ceramics International

Abbreviated source title:Ceram Int

Volume:47

Issue:9

Issue date:May 1, 2021

Publication year:2021

Pages:13164-13172

Language:English

ISSN:02728842

CODEN:CINNDH

Document type:Journal article (JA)

Publisher:Elsevier Ltd

Abstract:A series of multi-component fluoride-containing phosphate-based glasses prepared in a reducing atmosphere showed improved resistance to high-energy ultraviolet (UV) laser-induced damage and strong laser-induced fluorescence (LIF) within the glass bulk. The UV optical absorption, photoluminescence, and fluorescence decay properties of these glasses were investigated to explore the defect-related LIF mechanism and its underlying effect on the glasses’ laser-induced damage threshold (LIDT). Seven laser wavelengths ranging from 253 nm to 532 nm were used to excite the LIF, and two characteristic fluorescence bands peaking at approximately 414 nm and 780–800 nm occurred in all three types of glasses. The LIF band at 414 nm was attributed to PO<inf>3</inf>-EC defects in the second harmonic frequency (2ω) absorptive glass and third harmonic frequency (3ω) transparent glass, but Fe<sup>2+</sup> ions in the fundamental frequency (1ω) absorptive glass. A later fluorescence band at 780–800 nm occurred due to POHC defects in the 2ω absorptive and 3ω transparent glasses and Fe<sup>3+</sup> ions in the 1ω absorptive glass. A detailed study on the dynamic decay processes of two additional dominant fluorescence peaks at 450 nm and 780 nm under 266 nm excitation revealed the potential effect of LIF on LIDT improvement. The relatively longer LIF lifetime, higher LIF intensity, and larger LIF peak area corresponded with and contributed to a higher LIDT, especially in the 3ω transparent glass with a low UV absorption coefficient. This study provides strong evidence for the prior hypothesis between strong LIF and LIDT.<br/> © 2021 Elsevier Ltd and Techna Group S.r.l.

Number of references:49

Main heading:Glass

Controlled terms:Laser damage - Fluorescence - Laser produced plasmas - Defects - Fluorine compounds - Laser optics - Light absorption

Uncontrolled terms:Characteristic fluorescence - Fluorescence decays - Fundamental frequencies - Laser induced damage thresholds - Laser induced fluorescence - Phosphate based glass - Reducing atmosphere - Third-harmonic frequencies

Classification code:741.1 Light/Optics - 744.1 Lasers, General - 744.8 Laser Beam Interactions - 744.9 Laser Applications - 812.3 Glass - 932.3 Plasma Physics - 951 Materials Science

Numerical data indexing:Size 2.53e-07m to 5.32e-07m, Size 2.66e-07m, Size 4.14e-07m, Size 4.50e-07m, Size 7.80e-07m

DOI:10.1016/j.ceramint.2021.01.181

Funding details: Number: 61307046,61775235, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: XAB2016A08, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2017446, Acronym: -, Sponsor: Youth Innovation Promotion Association of the Chinese Academy of Sciences;

Funding text:This work is financially supported by the National Natural Science Foundation of China (NSFC No. 61775235 , 61307046 ), West Young Scholars Program of the Chinese Academy of Sciences ( XAB2016A08 ), and Youth Innovation Promotion Association, CAS ( 2017446 ).

Database:Compendex

Accession number:20211610236399

Title:Non-interferometric accurate phase imaging via linear-convergence iterative optimization (Open Access)

Authors:Huang, Jianhui (1, 2); Pan, An (3); Jin, Huiliang (1); Meng, Guoxiang (1); Ye, Qian (1, 4)

Author affiliation:(1) School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai; 200240, China; (2) Optics Laboratory, Georgia Institute of Technology, School of Electrical and Computer Engineering, 777 Atlantic Drive N.W., Atlanta; GA; 30332-0250, United States; (3) Pioneering Interdiscipline Center (PIC), State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (4) Laboratory of Radio Astronomy, Shanghai Observatory, Chinese Academy of Sciences, Shanghai; 200030, China

Corresponding author:Ye, Qian(yeqian@sjtu.edu.cn)

Source title:Optics and Lasers in Engineering

Abbreviated source title:Opt Lasers Eng

Volume:144

Issue date:September 2021

Publication year:2021

Article number:106630

Language:English

ISSN:01438166

CODEN:OLENDN

Document type:Journal article (JA)

Publisher:Elsevier Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">This paper reported a general non-interferometric high-accuracy quantitative phase imaging (QPI) method for arbitrary complex-valued objects. Given by a typical 4-f optical configuration as the imaging system, three frames of small-window phase modulation are applied on the object's Fourier spectrum so that redistributed intensity patterns are produced on the image plane, in which the object phase emerges at different degree. Then, an algebraic relationship that connects the object phase with the output intensity is established to provide us with an approximate closed-form phase recovery. Further, an efficient iterative optimization strategy is developed to turn that approximate solution into an accurate one. Due to the linear convergence property of the iteration, a high-accuracy phase recovery is achieved without requiring heavy iterations. The feasibility and accuracy of the proposed method are verified by both numerical simulations and experiments on diverse phase objects including biomedical tissues.<br/></div> © 2021

Number of references:42

Main heading:Phase modulation

Controlled terms:Interferometry - Numerical methods - Bioinformatics - Iterative methods

Uncontrolled terms:High-accuracy - Imaging method - In-line holography - Interferometrics - Iterative Optimization - Linear convergence - Phase imaging - Phase recovery - Phase retrieval - Quantitative phase imaging

Classification code:461.8.2 Bioinformatics - 921.6 Numerical Methods - 941.4 Optical Variables Measurements

DOI:10.1016/j.optlaseng.2021.106630

Funding details: Number: U1931137, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: -, Acronym: CSC, Sponsor: China Scholarship Council;

Funding text:National Science Foundation of China ( NSFC ), U1931137 ; China Scholarship Council (CSC) during the visit of Jianhui Huang to Georgia Tech is also acknowledged.

Database:Compendex

Open Access type(s): All Open Access, Green

Accession number:20221111776822

Title:Differential Fresnel Reflection Based Fiber-optic Relative Humidity Sensor

Authors:Feng, Yifei (1); Xu, Wei (2, 3); Yu, Cheungchuen (4); Li, Jing (5); He, Ying (1); Sun, Wenye (6)

Author affiliation:(1) Department of Marine Biomedicine and Polar Medicine, Naval Specialty Medical Center, Shanghai; 200433, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China; (4) Haina-Intelligent Photonic System Research Center, Yangtze Delta Region Institute of Tsinghua University, Jiaxing, Zhejiang, Hangzhou; 341006, China; (5) Anlight Optoelectronic Technology Inc., Suzhou; 215123, China; (6) Soochow University, Suzhou; 215000, China

Corresponding author:He, Ying(yinghe_hys@163.com)

Source title:2021 19th International Conference on Optical Communications and Networks, ICOCN 2021

Abbreviated source title:Int. Conf. Opt. Commun. Networks, ICOCN

Part number:1 of 1

Issue title:2021 19th International Conference on Optical Communications and Networks, ICOCN 2021

Issue date:2021

Publication year:2021

Language:English

ISBN-13:9781665424462

Document type:Conference article (CA)

Conference name:19th International Conference on Optical Communications and Networks, ICOCN 2021

Conference date:August 23, 2021 - August 27, 2021

Conference location:Qufu, China

Conference code:176985

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">Simple fiber-optic differential Fresnel reflection based relative humidity sensor with large dynamic range on is proposed and investigated. The response rate and the stability of the sensor are also addressed.<br/></div> © 2021 IEEE.

Number of references:21

Main heading:Humidity sensors

Controlled terms:Photonics - Fiber optics

Uncontrolled terms:Differential-fresnel reflection - Dynamic range - Fiber-optics - Fresnel reflections - Large dynamic range - Relative humidity sensors - Response rate - Simple++

Classification code:443.2 Meteorological Instrumentation - 741.1 Light/Optics - 741.1.2 Fiber Optics - 741.3 Optical Devices and Systems

DOI:10.1109/ICOCN53177.2021.9563701

Funding details: Number: BHJ20C008, Acronym: -, Sponsor: -;Number: SDFEYQN2020, Acronym: -, Sponsor: Second Affiliated Hospital of Soochow University;

Funding text:ACKNOWLEDGMENT This work was supported by the Army Logistics Research Project （ BHJ20C008 ） and the Advanced Research Fund of the Second Affiliated Hospital of Soochow University (SDFEYQN2020).

Database:Compendex

Accession number:20214811222112

Title:Beat-to-beat heart rate estimation from MZI-BCG signal based on hierarchical clustering

Authors:Zeng, Huaili (1); Xu, Wei (2, 3); Dong, Bo (4); Yu, Changyuan (6, 7); Zhao, Wei (2, 3, 5); Wang, Yishan (2, 3, 5); Sun, Wenye (8)

Author affiliation:(1) School of Information and Communication Engineering, University of Electronic Science and Technology of China, Chengdu; 611731, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China; (4) College of new Materials and new Energy, Shenzhen Technology University, Shenzhen; 518118, China; (5) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China; (6) The Hong Kong Polytechnic University, Shenzhen Research Institute, Guangdong, Shenzhen, China; (7) Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Hong Kong; (8) The Second Affiliated Hospital of Soochow University, Suzhou; 215000, China

Corresponding authors:Dong, Bo(dbo1978@163.com); Yu, Changyuan(changyuan.yu@polyu.edu.hk)

Source title:Optics InfoBase Conference Papers

Abbreviated source title:Opt. InfoBase Conf. Pap

Part number:1 of 1

Issue title:Optoelectronics and Communications Conference, OECC 2021

Issue date:2021

Publication year:2021

Article number:JS3F.13

Language:English

ISBN-13:9781557528209

Document type:Conference article (CA)

Conference name:26th Optoelectronics and Communications Conference, OECC 2021

Conference date:July 3, 2021 - July 7, 2021

Conference location:Virtual, Online, China

Conference code:174150

Publisher:The Optical Society

Number of references:3

Main heading:Heart

Uncontrolled terms:Heart-rate - Hier-archical clustering - Hierarchical Clustering - Matched filtering - Rate estimation

Classification code:461.2 Biological Materials and Tissue Engineering

Database:Compendex

Accession number:20214811222114

Title:Unobtrusive sleep-wake discrimination based on arched carbon fiber structure aided highly sensitive under mattress MZI-BCG sensor and SVM

Authors:Xu, Wei (1, 2); Han, Shuying (3, 9); Sun, Wenye (4); Dong, Bo (5); Yu, Changyuan (6, 7); Zhao, Wei (1, 2, 8); Wang, Yishan (1, 2, 8)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) School of Electronic and Information Engineering, Soochow University, Suzhou; 21513, China; (4) The Second Affiliated Hospital of Soochow University, Suzhou; 215000, China; (5) College of new Materials and new Energy, Shenzhen Technology University, Shenzhen; 518118, China; (6) The Hong Kong Polytechnic University, Shenzhen Research Institute, Guangdong, Shenzhen, China; (7) Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong; (8) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China; (9) Anlight Optoelectronic Technology Corporation

Corresponding authors:Dong, Bo(dbo1978@163.com); Yu, Changyuan(changyuan.yu@polyu.edu.hk)

Source title:Optics InfoBase Conference Papers

Abbreviated source title:Opt. InfoBase Conf. Pap

Part number:1 of 1

Issue title:Optoelectronics and Communications Conference, OECC 2021

Issue date:2021

Publication year:2021

Article number:JS3F.15

Language:English

ISBN-13:9781557528209

Document type:Conference article (CA)

Conference name:26th Optoelectronics and Communications Conference, OECC 2021

Conference date:July 3, 2021 - July 7, 2021

Conference location:Virtual, Online, China

Conference code:174150

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">A compact arched carbon fiber structure aided fiber Mach-Zehnder interferometer (MZI) ballistocardiogram (BCG) sensor is designed and presented, which is used to realize unobtrusive sleep-wake discrimination combining cardiopulmonary coupling (CPC) and support vector machine (SVM) algorithm with high sensitivity and accuracy.<br/></div> © OSA 2021, © 2021 The Author(s)

Number of references:5

Main heading:Support vector machines

Controlled terms:Carbon fibers - Wakes - Arches

Uncontrolled terms:Carbon fibre structure - Fiber Mach-Zehnder interferometers - High sensitivity - High-accuracy - Sleep/wake - Support vector machines algorithms - Support vectors machine

Classification code:408.2 Structural Members and Shapes - 631.1 Fluid Flow, General - 723 Computer Software, Data Handling and Applications - 804 Chemical Products Generally

Database:Compendex

Accession number:20224012832500

Title:Unobtrusive Sleep-Wake Discrimination Based on Arched Carbon Fiber Structure Aided Highly Sensitive under Mattress MZI-BCG Sensor and SVM

Authors:Xu, Wei (1, 2); Han, Shuying (3, 9); Sun, Wenye (4); Dong, Bo (5); Yu, Changyuan (6, 7); Zhao, Wei (1, 2, 8); Wang, Yishan (1, 2, 8)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) School of Electronic and Information Engineering, Soochow University, Suzhou; 21513, China; (4) The Second Hospital of Soochow University, Suzhou; 215000, China; (5) College of New Materials and New Energy, Shenzhen Technology University, Shenzhen; 518118, China; (6) The Hong Kong Polytechnic University, Shenzhen Research Institute, Guangdong, Shenzhen, China; (7) Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong; (8) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China; (9) Anlight Optoelectronic Technology Corporation

Corresponding authors:Dong, Bo(dbo1978@163.com); Yu, Changyuan(changyuan.yu@polyu.edu.hk)

Source title:2021 Opto-Electronics and Communications Conference, OECC 2021

Abbreviated source title:Opto-Electron. Commun. Conf., OECC

Part number:1 of 1

Issue title:2021 Opto-Electronics and Communications Conference, OECC 2021

Issue date:2021

Publication year:2021

Language:English

ISBN-13:9781943580927

Document type:Conference article (CA)

Conference name:2021 Opto-Electronics and Communications Conference, OECC 2021

Conference date:July 3, 2021 - July 7, 2021

Conference location:Hong Kong, Hong kong

Conference code:182432

Publisher:Institute of Electrical and Electronics Engineers Inc.

Number of references:5

Main heading:Support vector machines

Controlled terms:Arches - Carbon fibers - Wakes

Uncontrolled terms:Carbon fibre structure - Fiber Mach-Zehnder interferometers - High sensitivity - High-accuracy - Sleep/wake - Support vector machines algorithms - Support vectors machine

Classification code:408.2 Structural Members and Shapes - 631.1 Fluid Flow, General - 723 Computer Software, Data Handling and Applications - 804 Chemical Products Generally

Database:Compendex

Accession number:20220411504435

Title:Genetic Deep Learning for Photonic Device Inverse Design

Authors:Ren, Yangming (1); Zhang, Lingxuan (1); Zhang, Wenfu (1); Sun, Xiaochen (1)

Author affiliation:(1) Xi'an Institute Of Optics And Precision Mechanics, State Key Laboratory Of Transient Optics And Photonics, Xi'an, China

Source title:2021 IEEE Photonics Conference, IPC 2021 - Proceedings

Abbreviated source title:IEEE Photonics Conf., IPC - Proc.

Part number:1 of 1

Issue title:2021 IEEE Photonics Conference, IPC 2021 - Proceedings

Issue date:2021

Publication year:2021

Language:English

ISBN-13:9781665416016

Document type:Conference article (CA)

Conference name:2021 IEEE Photonics Conference, IPC 2021

Conference date:October 18, 2021 - October 21, 2021

Conference location:Virtual, Online, Canada

Conference code:174006

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">We demonstrate an inverse design method by combining deep neural networks and genetic optimization. The method significantly reduces the training data compared with existing methods. The method is adopted to design some ultra-compact photonic devices to show its high computing efficiency and great flexibility.<br/></div> © 2021 IEEE.

Number of references:6

Main heading:Photonic devices

Controlled terms:Deep neural networks - Design - Inverse problems - Silicon photonics - Learning systems

Uncontrolled terms:Computing efficiency - Genetic optimization - Inverse design methods - Inverse designs - Neural network optimization - Photonics devices - Training data

Classification code:461.4 Ergonomics and Human Factors Engineering - 741.1 Light/Optics - 741.3 Optical Devices and Systems

DOI:10.1109/IPC48725.2021.9593021

Database:Compendex

Accession number:20211910318664

Title:Diode-pumped SESAM mode-locked low-repetition-rate Tm:CALGO picosecond laser at 1968 nm

Authors:Guo, Lei (1, 2, 3); Yang, Yaling (1, 2, 3); Zhao, Shengzhi (3); Li, Tao (3); Qiao, Wenchao (3, 4); Wang, Ruihua (2); Zhang, Baitao (2, 6); Yang, Kejian (2, 4, 5, 6); He, Jingliang (2, 6); Li, Xun (7)

Author affiliation:(1) School of Mechanics and Photoelectric Physics, Anhui University of Science and Technology, Huainan; 232001, China; (2) Institute of Novel Semiconductors, State Key Laboratory of Crystal Materials, Shandong University, Jinan; 250100, China; (3) School of Information Science and Engineering, Shandong Provincial Key Laboratory of Laser Technology and Application, Shandong University, Qingdao; 266237, China; (4) Shenzhen Research Institute of Shandong University, Shenzhen; 518057, China; (5) State Key Laboratory of Quantum Optics and Quantum Optics Devices, Shanxi University, Taiyuan; 030006, China; (6) Collaborative Innovation Center of Light Manipulations and Applications, Shandong Normal University, Jinan; 250358, China; (7) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China

Corresponding author:Yang, Kejian(k.j.yang@sdu.edu.cn)

Source title:Optics and Laser Technology

Abbreviated source title:Opt Laser Technol

Volume:142

Issue date:October 2021

Publication year:2021

Article number:107195

Language:English

ISSN:00303992

CODEN:OLTCAS

Document type:Journal article (JA)

Publisher:Elsevier Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">A diode-pumped SESAM continuous-wave mode-locked (CWML) Tm:CALGO laser is demonstrated at a new center wavelength of 1968 nm based on a ultra-long Z-shaped folding cavity configuration. A total maximum dual-output power of 328 mW is achieved with a pulse duration of 33.2 ps at a repetition rate of 38.86 MHz, corresponding to a maximum single pulse energy of 4.2 nJ.<br/></div> © 2021 Elsevier Ltd

Number of references:17

Main heading:Picosecond lasers

Controlled terms:Pulse repetition rate - Pumping (laser)

Uncontrolled terms:Center-wavelength - Continuous wave modes - Diode-pumped - Foldings - Low repetition rate - Mode-locked - Picosecond laser - SESAM - Tm:CALGO - Ultra longs

Classification code:744.1 Lasers, General

Numerical data indexing:Energy 4.20E-09J, Frequency 3.886E+07Hz, Power 3.28E-01W, Size 1.968E-06m, Time 3.32E-11s

DOI:10.1016/j.optlastec.2021.107195

Funding details: Number: JCYJ 20180305163932273, Acronym: -, Sponsor: -;Number: KF201908, Acronym: -, Sponsor: -;Number: 2017CXCC0808, Acronym: -, Sponsor: Key Technology Research and Development Program of Shandong;Number: 61775119, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2017YFB0405204, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;Number: S2019-YF-ZDCXL-ZDLGY-0253, Acronym: -, Sponsor: Shanxi Provincial Key Research and Development Project;

Funding text:This work was partially supported by Scientific Research Foundation of Anhui University of Science and Technology, National Key Research and Development Program of China (2017YFB0405204), National Natural Science Foundation of China (NSFC) (No.61775119), Key research and development program of Shandong Province (2017CXCC0808), Shenzhen Science and Technology Research and Development Funds (JCYJ 20180305163932273), the Program of State Key Laboratory of Quantum Optics and Quantum Optics Devices (KF201908), and Key Research and Development Program of Shaanxi Province (S2019-YF-ZDCXL-ZDLGY-0253).

Database:Compendex

Accession number:20224012832605

Title:Non-invasive Highly Sensitive under Mattress Vital Signs Monitoring Based on Fiber Sagnac Loop

Authors:Zeng, Huaili (1); Xu, Wei (2, 3); Dong, Bo (4); Yu, Changyuan (6, 7); Zhao, Wei (2, 3, 5); Wang, Yishan (2, 3, 5); Sun, Wenye (8)

Author affiliation:(1) School of Information and Communication Engineering, University of Electronic Science and Technology of China, Chengdu; 611731, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China; (4) College of New Materials and New Energy, Shenzhen Technology University, Shenzhen; 518118, China; (5) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China; (6) The Hong Kong Polytechnic University, Shenzhen Research Institute, Guangdong, Shenzhen, China; (7) Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Hong Kong, Hong Kong; (8) The Second Hospital of Soochow University, Suzhou; 215000, China

Corresponding author:Yu, Changyuan(changyuan.yu@polyu.edu.hk)

Source title:2021 Opto-Electronics and Communications Conference, OECC 2021

Abbreviated source title:Opto-Electron. Commun. Conf., OECC

Part number:1 of 1

Issue title:2021 Opto-Electronics and Communications Conference, OECC 2021

Issue date:2021

Publication year:2021

Language:English

ISBN-13:9781943580927

Document type:Conference article (CA)

Conference name:2021 Opto-Electronics and Communications Conference, OECC 2021

Conference date:July 3, 2021 - July 7, 2021

Conference location:Hong Kong, Hong kong

Conference code:182432

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">A non-invasive highly sensitive under mattress vital signs monitoring system is proposed for real-time and long-term respiration and heartbeat monitoring, which is based on Sagnac loop and polarization-maintaining fiber.<br/></div> © 2021 OSA.

Number of references:3

Main heading:Patient monitoring

Controlled terms:Optical fiber communication - Polarization-maintaining fiber

Uncontrolled terms:Fiber sagnac loops - Heartbeat monitoring - Monitoring system - Polarization maintaining fibre - Real- time - Respiration monitoring - Sagnac loop - Vital signs monitoring

Classification code:461.6 Medicine and Pharmacology - 717.1 Optical Communication Systems - 741.1.2 Fiber Optics

Database:Compendex

Accession number:20214811222113

Title:Non-invasive highly sensitive under mattress vital signs monitoring based on fiber sagnac loop

Authors:Zeng, Huaili (1); Xu, Wei (2, 3); Dong, Bo (4); Yu, Changyuan (6, 7); Zhao, Wei (2, 3, 5); Wang, Yishan (2, 3, 5); Sun, Wenye (8)

Corresponding authors:Dong, Bo(dbo1978@163.com); Yu, Changyuan(changyuan.yu@polyu.edu.hk)

Source title:Optics InfoBase Conference Papers

Abbreviated source title:Opt. InfoBase Conf. Pap

Part number:1 of 1

Issue title:Optoelectronics and Communications Conference, OECC 2021

Issue date:2021

Publication year:2021

Article number:JS3F.14

Language:English

ISBN-13:9781557528209

Document type:Conference article (CA)

Conference name:26th Optoelectronics and Communications Conference, OECC 2021

Conference date:July 3, 2021 - July 7, 2021

Conference location:Virtual, Online, China

Conference code:174150

Publisher:The Optical Society

Number of references:3

Main heading:Polarization-maintaining fiber

Controlled terms:Patient monitoring - Optical fiber communication

Uncontrolled terms:Fiber sagnac loops - Heartbeat monitoring - Monitoring system - Polarization maintaining fibre - Real- time - Respiration monitoring - Sagnac loop - Vital signs monitoring

Classification code:461.6 Medicine and Pharmacology - 717.1 Optical Communication Systems - 741.1.2 Fiber Optics

Database:Compendex

Accession number:20212510523132

Title:Aerial Infrared Object Tracking via an improved Long-term Correlation Filter with optical flow estimation and SURF matching

Authors:Wang, Xiaotian (1); Zhang, Kai (1); Zhang, Ximing (2); Li, Shaoyi (1); Yan, Jie (1)

Author affiliation:(1) School of Astronautics, Northwestern Polytechnical University, Xi'an; 710072, China; (2) Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China

Corresponding author:Zhang, Kai(singlechip@163.com)

Source title:Infrared Physics and Technology

Abbreviated source title:Infrared Phys Technol

Volume:116

Issue date:August 2021

Publication year:2021

Article number:103790

Language:English

ISSN:13504495

CODEN:IPTEEY

Document type:Journal article (JA)

Publisher:Elsevier B.V.

Abstract:<div data-language="eng" data-ev-field="abstract">At present, there are many excellent algorithms in the field of visual object tracking. The correlation filter algorithms are more suitable for infrared object tracking, for the tracking performance is the best. Especially, the long-term correlation tracking has received much attention, owing to its ability to handle the problems of universal tracking (e.g., slight deformation, small-displacement motion, partial occlusion and out of view). However, there are three imperfections such that it fails to solve the problem of rapid motion, it cannot cope with the problem of boundary effect perfectly, and it has poor tracking effect in the case of severe occlusion and severe deformation. Aiming at the problem of rapid motion, the FlowNet 2.0 is introduced to accomplish optical flow estimation, offering motion information and predicting trajectory change process. Aiming to address the concern of boundary effect perfectly, the adjustable Gaussian window is effective to separate the object and the background, improving classifier discrimination. Aiming at the issue of poor tracking effect in the case of severe occlusion and severe deformation, the SURF feature-based matching method is effective to accurately track object and improve the infrared object tracking performance. In addition, the ratio between average peak-to-correlation energy (APCE) and its historical average, as a further complement of maximum response, is introduced to achieve the online updating mechanism, jointly determining whether the tracker needs to be updated, the SURF matching needs to be carried out or the tracker needs to be initialized by re-detector. Our algorithm is validated on synthetic infrared aerial object image sequences, real infrared thermal aerial object image sequences and a public database named AMCOM FLIR respectively. The extensive experimental testify that our improved approach achieves an optimal effect for aerial infrared object tracking in terms of precision plot, success plot and speed.<br/></div> © 2021

Number of references:41

Main heading:Antennas

Controlled terms:Optical flows - Tracking (position) - Optical correlation - Deformation

Uncontrolled terms:Average peak-to-correlation energy criteria - Boundary effects - Correlation filters - Infrared aerial object tracking - Infrared object tracking - Long-term correlations - Matchings - Optical flow estimation - Rapid motions - Tracking performance

Classification code:741.1 Light/Optics

DOI:10.1016/j.infrared.2021.103790

Database:Compendex

Accession number:20214010966294

Title:Temporal Constraint Background-Aware Correlation Filter with Saliency Map

Authors:Liao, Jiawen (1); Qi, Chun (2); Cao, Jianzhong (1)

Author affiliation:(1) Department of xi'An, Institute of Optics and Precision Mechanics, Xi'an; 710119, China; (2) School of Electronics and Information Engineering, Xi'An Jiaotong University, Xi'an; 710049, China

Corresponding author:Liao, Jiawen(liaojiawen@126.com)

Source title:IEEE Transactions on Multimedia

Abbreviated source title:IEEE Trans Multimedia

Volume:23

Issue date:2021

Publication year:2021

Pages:3346-3361

Language:English

ISSN:15209210

E-ISSN:19410077

CODEN:ITMUF8

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">Correlation filter (CF) based trackers have recently drawn great attention in visual tracking community due to their impressive performance, and computational efficiency on benchmark datasets. However, the performance of most existing trackers using correlation filter is hampered by two aspects: i) Included background information in the selected rectangular target patch is considered as part of the target, and they are treated as important as the real target in training new filter model, it causes the filter easily drift when target shape changes dramatically. ii) Existing filters use a moving average operation with an empirical weight to update the filter model in each frame, such per frame adaptation constantly introduces new information of the target patch, but never consider the consistence of the historical information, and the newly obtained one, further increases the risk of drifting. This paper presents a new framework including saliency map, and a novel CF regression model. We reformulate the original optimization problem, and provide a closed form solution for multidimensional features which is solved efficiently using alternating direction method of multipliers (ADMM), and accelerated using Sherman-Morrison lemma, our algorithm as a new framework can be easily integrated into CF base trackers to boost their tracking performance. We perform comprehensive experiments on five benchmarks: OTB-2015, VOT2016, VOT2018, UAV123, and TempleColor-128. Results show that the proposed method performs favorably against lots of state-of-the-art methods with a speed close to real-time. Our method with deep features performs much better on all 5 datasets.<br/></div> © 1999-2012 IEEE.

Number of references:57

Main heading:Computational efficiency

Controlled terms:Regression analysis - Benchmarking

Uncontrolled terms:Correlation filters - Drift - Filter model - Filter-based - Performance - Saliency - Saliency map - Sherman-morrison - Temporal constraints - Visual Tracking

Classification code:922.2 Mathematical Statistics

DOI:10.1109/TMM.2020.3023794

Funding details: Number: 51905529,61572395,61675161, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:Manuscript received August 12, 2019; revised May 20, 2020; accepted September 3, 2020. Date of publication September 14, 2020; date of current version September 24, 2021. This work was supported by the National Natural Science Foundation of China under Grants 61572395, 61675161, and 51905529. The associate editor coordinating the review of this manuscript and approving it for publication was Dr. Elisa Ricci. (Corresponding author: Jiawen Liao.) Jiawen Liao and Jianzhong Cao are with the Department of Xi’an Institute of Optics and Precision Mechanics, Xi’an 710119, China (e-mail: liaojiawen@126.com; cjz@opt.ac.cn).

Database:Compendex

Accession number:20220211444592

Title:Application of machine learning in the alignment of off-Axis optical system

Authors:Yu, Lei (1); Ma, Caiwen (1); Fu, Xing (1); Yin, Yamei (1); Cao, Mingqiang (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Cas, NO.17 Xinxi Road, Xi'an Hi-Tech Industrial Development Zone, Xi'an; Shaanxi; 710119, China

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12069

Part number:1 of 1

Issue title:AOPC 2021: Novel Technologies and Instruments for Astronomical Multi-Band Observations

Issue date:2021

Publication year:2021

Article number:120690P

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510650138

Document type:Conference article (CA)

Conference name:2021 Applied Optics and Photonics China: Novel Technologies and Instruments for Astronomical Multi-Band Observations, AOPC 2021

Conference date:June 20, 2021 - June 22, 2021

Conference location:Beijing, China

Conference code:175885

Sponsor:Chinese Society for Optical Engineering

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">Coaxial optical system has a symmetry of revolution. Alignment for this kind of optical system is easy. The desired image quality can be rapidly converged. As for off-Axis optical system, traditional optical alignment method can not be used due to the loss of rotational symmetry. Low initial position accuracy makes installation and adjustment more difficult than usual. In this paper, we aim to solve the alignment problem for off-Axis optical system with the help of machine learning and its powerful numerical fitting ability. We carried out our research on alignment method for an Gregorian off-Axis system. The location of primary mirror is fixed as the optical reference. Alignment process is to adjust posture of secondary mirror to acquire ideal image quality. We use Zemax and Python co-simulation technology to get simulated data. Then multi-layer artificial neural network is utilized to fit the mathematical relationship between misalignments and Zernike coefficients. Given the coefficients, the misalignments can be calculated by the neural network. Finally we conduct alignment experiment to verify the proposed method. The result has proved that this method is a fast and efficient alignment solution for the off-Axis optical systems.<br/></div> © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

Number of references:9

Main heading:Machine learning

Controlled terms:Computer software - Multilayer neural networks - Mirrors - Network layers - Image quality - Alignment - Optical systems

Uncontrolled terms:Alignment methods - Coaxial optical systems - Desired image qualities - Machine-learning - Neural-networks - Off-axis - Off-axis optical system - Optical alignments - Position accuracy - Rotational symmetries

Classification code:601.1 Mechanical Devices - 723 Computer Software, Data Handling and Applications - 723.4 Artificial Intelligence - 741.3 Optical Devices and Systems

DOI:10.1117/12.2606474

Database:Compendex

Accession number:20213110717603

Title:Two-center interference and stereo Wigner time delay in photoionization of asymmetric molecules

Authors:Liao, Yijie (1); Zhou, Yueming (1); Pi, Liang-Wen (2, 3); Ke, Qinghua (1); Liang, Jintai (1); Zhao, Yong (1); Li, Min (1); Lu, Peixiang (1, 4, 5)

Author affiliation:(1) School of Physics, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan; 430074, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) University of Chinese Academy of Science, Beijing; 100049, China; (4) Hubei Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan; 430205, China; (5) CAS Center for Excellence in Ultra-intense Laser Science, Shanghai; 201800, China

Source title:Physical Review A

Abbreviated source title:Phys. Rev. A

Volume:104

Issue:1

Issue date:July 2021

Publication year:2021

Article number:013110

Language:English

ISSN:24699926

E-ISSN:24699934

Document type:Journal article (JA)

Publisher:American Physical Society

Abstract:<div data-language="eng" data-ev-field="abstract">We present numerical simulations of the time delay in photoemission of asymmetric diatomic molecules using the technique of reconstruction of attosecond beating by interference of two-photon transitions (RABITT) by solving the time-dependent Schrödinger equation. Our results show an obvious time delay between photoelectrons emitted to the left and right and this relative time delay oscillates as the photoelectron energy changes. More interestingly, the amplitude of this oscillation increases when the asymmetry degree of diatomic molecules decreases. With the method of the selected continuum wave functions, we calculate the Wigner time delay in photoionization. The obtained stereo Wigner time delay also oscillates with photoelectron energy. This oscillation is traced back to two-center interferences and it could explain the relative time delay in the RABITT measurement. Furthermore, our results indicate that the continuum-continuum time delay in photoemission of heteronuclear molecules is asymmetric.<br/></div> © 2021 American Physical Society

Number of references:64

Main heading:Time delay

Controlled terms:Photoionization - Photons - Timing circuits - Wave functions - Photoemission - Molecules - Photoelectrons

Uncontrolled terms:Asymmetric molecules - Diatomic molecules - Dinger equation - Heteronuclear molecules - Photoelectron energy - Relative time delays - Two-center interference - Two-photon transitions

Classification code:701.1 Electricity: Basic Concepts and Phenomena - 711 Electromagnetic Waves - 713 Electronic Circuits - 713.4 Pulse Circuits - 741.1 Light/Optics - 802.2 Chemical Reactions - 921 Mathematics - 931.3 Atomic and Molecular Physics

DOI:10.1103/PhysRevA.104.013110

Funding details: Number: 11874163,12021004, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: J19-121-III,S19-001, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2019YFA0308300, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Funding text:The authors acknowledge stimulating discussions with Professor Manfred Lein and Dr. Tomá&scaron; Zimmermann. This work was supported by National Key Research and Development Program of China (Grant No. 2019YFA0308300), National Natural Science Foundation of China (Grants No. 11874163 and No. 12021004), and Chinese Academy of Sciences (Grants No. J19-121-III and No. S19-001).National Basic Research Program of China (973 Program) National Natural Science Foundation of China Chinese Academy of Sciences

Database:Compendex

Accession number:20212510529574

Title:Comprehensive risk assessment of transmission lines affected by multi-meteorological disasters based on fuzzy analytic hierarchy process

Authors:Han, Binbin (1); Ming, Zhengfeng (1); Zhao, Yuhu (1); Wen, Tao (1); Xie, Meilin (2)

Author affiliation:(1) School of Mechanic-Electronic Engineering, Xidian University, Xi'an; 710071, China; (2) Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China

Corresponding author:Ming, Zhengfeng(zfming@xidian.edu.cn)

Source title:International Journal of Electrical Power and Energy Systems

Abbreviated source title:Int J Electr Power Energy Syst

Volume:133

Issue date:December 2021

Publication year:2021

Article number:107190

Language:English

ISSN:01420615

CODEN:IEPSDC

Document type:Journal article (JA)

Publisher:Elsevier Ltd

Number of references:43

DOI:10.1016/j.ijepes.2021.107190

Database:Compendex

Accession number:20203809183985

Title:Study on the performance of polarization maintaining fiber temperature sensor based on tilted fiber grating

Authors:Zhao, Jun (1, 3); Wang, Hushan (2); Sun, Xiaohan (1)

Author affiliation:(1) School of Electronic Science and Engineering, Southeast University, Nanjing; 210096, China; (2) Xian Institute of Optics and Precision Mechanics of CAS, Xian; 710119, China; (3) Nanjing Sunlight Information Technology Co., Ltd., Nanjing; 210012, China

Corresponding author:Zhao, Jun(103200021@seu.edu.cn)

Source title:Measurement: Journal of the International Measurement Confederation

Abbreviated source title:Meas J Int Meas Confed

Volume:168

Issue date:15 January 2021

Publication year:2021

Article number:108421

Language:English

ISSN:02632241

CODEN:MSRMDA

Document type:Journal article (JA)

Publisher:Elsevier B.V.

Abstract:A novel functional-type high integration polarization interference fiber temperature sensor based on 45° tilted fiber Bragg grating in-fiber polarizer (TFBG-PIF-TS) is proposed. The accuracy, resolution, stability, linearity and sensitivity of the prototype are tested and compared with PT100, 18B20 as well as polarizing plate based polarization interferometric fiber temperature sensor (PP-PIF-TS). The feasibility of the scheme in the transformer winding temperature monitoring is verified. The results show that the accuracy and resolution of TFBG-PIF-TS reach ±0.1 °C and 0.01 °C respectively, which has higher resolution, better integration and reliability, and has simple structure, strong anti-vibration and anti-electromagnetic interference abilities. Therefore, the proposed scheme can meet the needs of high voltage, strong magnetic field and other passive precise temperature measurement occasions.<br/> © 2020 Elsevier Ltd

Number of references:24

Main heading:Polarization-maintaining fiber

Controlled terms:Temperature measurement - Electromagnetic pulse - Light polarization - Fiber Bragg gratings - Temperature sensors - Optical instruments

Uncontrolled terms:Fiber temperature sensors - Higher resolution - Polarization interferences - Simple structures - Strong magnetic fields - Temperature monitoring - Tilted fiber Bragg grating - Tilted fiber gratings

Classification code:701 Electricity and Magnetism - 741.1 Light/Optics - 741.1.2 Fiber Optics - 941.3 Optical Instruments - 944.5 Temperature Measuring Instruments - 944.6 Temperature Measurements

Numerical data indexing:Temperature 2.73e+02K

DOI:10.1016/j.measurement.2020.108421

Database:Compendex

Accession number:20211110079184

Title:Research on 3D pose measurement algorithm based on binocular vision (Open Access)

Authors:Shan, Fu Qiang (1); Wang, Feng (1); Zhang, Hai Feng (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics of UCAS, University of Chinese Academy of Sciences, Xi'an, Shanxi; 710119, China

Corresponding author:Zhang, Hai Feng(Zhanghf@opt.ac.cn)

Source title:Journal of Physics: Conference Series

Abbreviated source title:J. Phys. Conf. Ser.

Volume:1792

Part number:1 of 1

Issue:1

Issue title:International Conference on Communications, Information System and Software Engineering, CISSE 2020

Issue date:February 19, 2021

Publication year:2021

Article number:012043

Language:English

ISSN:17426588

E-ISSN:17426596

Document type:Conference article (CA)

Conference name:2020 International Conference on Communications, Information System and Software Engineering, CISSE 2020

Conference date:December 18, 2020 - December 20, 2020

Conference location:Guangzhou, China

Conference code:167641

Publisher:IOP Publishing Ltd

Abstract:Based on binocular vision, this paper proposes an algorithm for fast and accurate three-dimensional measurement. The binocular 3D measurement system is mainly divided into four parts: binocular calibration, binocular correction, binocular matching and pose calculation. In this paper, an international softwareM is used to achieve camera calibration, the FAST algorithm is used to achieve the extraction of feature points, and the matching method that combines gray-level correlation coefficient (cc) and epipolar constraint is selected. Experiments have verified that this algorithm can accurately achieve three-dimensional pose measurement.<br/> © 2021 Journal of Physics: Conference Series.

Number of references:6

Main heading:Binocular vision

Controlled terms:Binoculars - Calibration - Stereo image processing

Uncontrolled terms:3-D measurement systems - 3D pose measurement - Binocular calibrations - Binocular matching - Camera calibration - Epipolar constraints - Extraction of feature points - Three-dimensional measurements

Classification code:723.2 Data Processing and Image Processing - 741.2 Vision - 741.3 Optical Devices and Systems

DOI:10.1088/1742-6596/1792/1/012043

Database:Compendex

Open Access type(s): All Open Access, Bronze

Accession number:20211710250118

Title:Spectroscopic properties of ErF<inf>3</inf> doped tellurite-gallium oxyfluoride glass for &sim;3 μm laser materials

Authors:Wan, Rui (1, 2); Wang, Pengfei (1, 2); Li, Shengwu (1, 2); Ma, Yuan (1, 2); Zhang, Guangwei (3)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xiâ€™an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences (CAS), Xi'an; Shaanxi; 710119, China; (2) Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Zhejiang Fountain Aptitude Technology Inc., Hangzhou; 310051, China

Corresponding author:Wang, Pengfei(pfwang@opt.ac.cn)

Source title:Journal of Applied Physics

Abbreviated source title:J Appl Phys

Volume:129

Issue:15

Issue date:April 21, 2021

Publication year:2021

Article number:153105

Language:English

ISSN:00218979

E-ISSN:10897550

CODEN:JAPIAU

Document type:Journal article (JA)

Publisher:American Institute of Physics Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">ErF<inf>3</inf>-doped TeO<inf>2</inf>-Ga<inf>2</inf>O<inf>3</inf>-BaF<inf>2</inf>-AlF<inf>3</inf>-Y<inf>2</inf>O<inf>3</inf> (TGBAY) glasses with high fluorescence efficiency and a high thermal damage threshold were developed for potential mid-infrared fiber laser applications. A model 2.7-μm fiber laser based on this material was analyzed using rate and propagation equations. Under 808 and 980 nm laser pumping, fluorescence emissions with central wavelength at 1.55 and 2.73 μm were detected. Based on the Judd-Ofelt (J-O) theory, the intensity parameters (Ωλ, λ = 2, 4, and 6) and radiative transition property were calculated and characterized through absorption and emission spectra. The results indicated that tellurite-gallium oxyfluoride glass had a high glass transition temperature (T<inf>g</inf>, &sim;391 °C), large emission cross sections at 1.55 μm (6.32 × 10<sup>−21</sup> cm<sup>2</sup>) and 2.73 μm (9.68 × 10<sup>−21</sup> cm<sup>2</sup>) as well as a longer fluorescence lifetime (6.84 ms at 1.55 μm and 262 μs at 2.73 μm) relative to the conventional Er<sup>3+</sup>-doped tellurite glass. The temperature dependence of the emission spectra indicated that TGBAY-2Er glass was more favorable to achieve infrared emission at low temperatures. Numerical simulation revealed the feasibility of achieving a &sim;2.7 μm fiber laser operation based on the developed Er<sup>3+</sup>-doped tellurite-gallium oxyfluoride glass fiber.<br/></div> © 2021 Author(s).

Number of references:66

Main heading:Fiber lasers

Controlled terms:Aluminum compounds - Fluorescence - Pumping (laser) - Barium compounds - Glass - Temperature distribution - Emission spectroscopy - Erbium compounds - Tellurium compounds - Gallium compounds - Glass transition - Judd-Ofelt theory

Uncontrolled terms:Absorption and emission spectra - Emission cross section - Fluorescence efficiency - Fluorescence lifetimes - High-glass transition temperatures - Radiative transitions - Spectroscopic property - Temperature dependence

Classification code:641.1 Thermodynamics - 741.1 Light/Optics - 744.1 Lasers, General - 744.4 Solid State Lasers - 802.3 Chemical Operations - 812.3 Glass - 931.3 Atomic and Molecular Physics

Numerical data indexing:Size 2.70e-06m

DOI:10.1063/5.0047010

Database:Compendex

Accession number:20213110715981

Title:Optical path pointing error and coaxiality analysis of APT system of space laser communication terminal (Open Access)

Authors:Furui, Zhang (1); Ping, Ruan (2); Junfeng, Han (2)

Author affiliation:(1) College of Optoelectronic Engineering, Xi'an Technological University, Xi'an; 710021, China; (2) Xi'an Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences (CAS), Xi'an; 710119, China

Corresponding author:Furui, Zhang(jiffring@126.com)

Source title:Optica Applicata

Abbreviated source title:Opt Appl

Volume:51

Issue:2

Issue date:2021

Publication year:2021

Pages:203-222

Language:English

ISSN:00785466

E-ISSN:18997015

CODEN:OPAPBZ

Document type:Journal article (JA)

Publisher:Wroc&lstrok;aw University of Science and Technology

Abstract:<div data-language="eng" data-ev-field="abstract">Precision beam pointing is the key indicator for APT (acquisition, pointing and tracking) system in space laser communication. The laser travels inside the optical system and the pointing vector will be affected by an assembly error of the axis and reflectors. In this paper, the model of the optical path pointing error and coaxiality error induced by the assembly error are established; the error distribution is given and a quantitative analysis is performed. The results show that the magnitude of pointing error is affected by the axis assembling error greatly but its distribution is susceptible to the reflector assembly error. Finally, the correction of coaxiality is performed and tested. The experimental results show that the coaxiality error can be greatly improved and the mean value of the coaxiality error of a beacon path and a signal path are 14 and 9.6 μrad, respectively, which meets the requirements. This work can provide guidance for design and assembly of the APT and contribute to the improvement of its pointing performance.<br/></div> © 2021 WrocÅ&sbquo;aw University of Science and Technology. All rights reserved.

Number of references:14

Main heading:Errors

Controlled terms:Optical communication - Reflection - Optical systems

Uncontrolled terms:Acquisition , pointing and tracking - Assembling errors - Assembly error - Design and assemblies - Error distributions - Pointing errors - Provide guidances - Space laser communication

Classification code:717.1 Optical Communication Systems - 741.3 Optical Devices and Systems

DOI:10.37190/oa210205

Funding details: Number: Y655811213, Acronym: CAS, Sponsor: Chinese Academy of Sciences;

Funding text:Acknowledgement – This article was supported by the 135 project of the Institute of Chinese Academy of Sciences (No. Y655811213). The coaxiality experiments were carried out in the key laboratory of space precision measurement technology, Chinese Academy of Sciences.

Database:Compendex

Open Access type(s): All Open Access, Bronze, Green

Accession number:20210083991

Title:Radio frequency spectrum analyzer with a 5 THz bandwidth based on nonlinear optics in a CMOS-compatible high-index doped silica waveguide

Authors:Li, Yuhua (1, 2); Kang, Zhe (3, 4); Zhu, Kun (2); Ai, Shiqi (2); Wang, Xiang (5); Davidson, Roy R. (5); Wu, Yan (1); Morandotti, Roberto (6); Little, Brent E. (7); Moss, David J. (8); Chu, Sai Tak (2)

Author affiliation:(1) Key Laboratory of Optical Field Manipulation of Zhejiang Province, Department of Physics, Zhejiang Sci-Tech University, Hangzhou; Zhejiang; 310018, China; (2) Department of Physics, City University of Hong Kong, Kowloon Tong; 999077, Hong Kong; (3) Ningbo Research Institute, Zhejiang University, Ningbo; 310000, China; (4) Centre for Optical and Electromagnetic Research, National Engineering Research Center for Optical Instruments, Zhejiang University, Hangzhou; 315000, China; (5) QXP Technology, Xi'an; 710311, China; (6) INRS-Énergie, Matériaux et Télécommunications, Varennes; J3X 1S2, Canada; (7) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Science, Xi'an; 710119, China; (8) Optical Sciences Centre, Swinburne University of Technology, Hawthorn; VIC; 3122, Australia

Source title:arXiv

Abbreviated source title:arXiv

Issue date:March 18, 2021

Publication year:2021

Language:English

E-ISSN:23318422

Document type:Preprint (PP)

Publisher:arXiv

Abstract:<div data-language="eng" data-ev-field="abstract">We report an all-optical radio-frequency (RF) spectrum analyzer with a bandwidth greater than 5 terahertz (THz), based on a 50-cm long spiral waveguide in a CMOS-compatible high-index doped silica platform. By carefully mapping out the dispersion profile of the waveguides for different thicknesses, we identify the optimal design to achieve near zero dispersion in the C-band. To demonstrate the capability of the RF spectrum analyzer, we measure the optical output of a femtosecond fiber laser with an ultrafast optical RF spectrum in the terahertz regime.<br/></div> © 2021, CC BY.

Number of references:26

Main heading:Spectrum analyzers

Controlled terms:Bandwidth - CMOS integrated circuits - Fiber lasers - Nonlinear optics - Silica - Terahertz waves - Waveguides

Uncontrolled terms:All optical - CMOS Compatible - Dispersion profile - Doped silicas - Higher index - Long spirals - Radio frequency spectrum - Silica waveguide - Spiral waveguides - Tera Hertz

Classification code:711 Electromagnetic Waves - 714.2 Semiconductor Devices and Integrated Circuits - 714.3 Waveguides - 716.1 Information Theory and Signal Processing - 741.1.1 Nonlinear Optics - 744.4 Solid State Lasers

Numerical data indexing:Frequency 5.00E+12Hz, Size 5.00E-01m

Database:Compendex

Preprint source website:https://arxiv.org

Preprint ID type:ARXIV

Accession number:20212110404350

Title:Design of Optical System for Broadband and Integrated AOTF Imaging Spectrometer

Title of translation:宽谱段一体化AOTF成像光谱仪光学系统设计

Authors:Chang, Lingying (1); Zhang, Qiang (1); Qiu, Yuehong (2)

Author affiliation:(1) School of Electronic Engineering, Xi'an University of Posts & Telecommunications, Xi'an; 710121, China; (2) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China

Source title:Guangxue Xuebao/Acta Optica Sinica

Abbreviated source title:Guangxue Xuebao

Volume:41

Issue:7

Issue date:April 10, 2021

Publication year:2021

Article number:0722002

Language:Chinese

ISSN:02532239

CODEN:GUXUDC

Document type:Journal article (JA)

Publisher:Chinese Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">Acousto-optic tunable filter (AOTF) imaging spectrometer can acquire image, spectrum and polarization information simultaneously. It has been successfully applied to the aerospace, agriculture, forestry, medicine, food safety, and other fields, thus having good development prospects. Optical system is one of the key parts in an AOTF imaging spectrometer to obtain information. Therefore, the optical systems of common AOTF imaging spectrometers are studied in this paper, and the working principle of AOTF and the general design scheme of the spectrometers are introduced. Furthermore, the optical design parameters of the whole system, such as the front, collimating and imaging sub-systems are calculated, and the common-aperture optical system is simulated. The front optical system has an off-axis three-mirror structure based on free-form surface, which matches with the aperture stop of the collimating system, and the collimating and imaging systems are off-axis three-mirror systems with front offset of the aperture stop. The simulation results show that the system has an MTF values close to the diffraction limit and greater than 0.57 at the bands of 0.41.0 μm, 1.03.0 μm, and 3.05.0 μm, a distortion less than 5%, and good imaging quality, in the case of the working band of 0.45.0 μm, F number 5, field of view angle of 5.3°.<br/></div> © 2021, Chinese Lasers Press. All right reserved.

Number of references:32

Main heading:Optical systems

Controlled terms:Surface measurement - Diffraction - Optical design - Spectrometers - Forestry - Mirrors

Uncontrolled terms:Acousto-optic tunable filters - Design parameters - Development prospects - Diffraction limits - Free-form surface - Imaging spectrometers - Mirror structure - Off-axis three mirror system

Classification code:741.1 Light/Optics - 741.3 Optical Devices and Systems - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 943.2 Mechanical Variables Measurements

Numerical data indexing:Percentage 5.00e+00%

DOI:10.3788/AOS202141.0722002

Database:Compendex

Accession number:20215211394017

Title:DNN-Assisted activity classification using fiber interferometer sensor

Authors:Zhu, Guohao (1); Xu, Wei (2, 3); Yu, Cheung Chuen (4); Sun, Wenye (5); Dong, Bo (6); Yu, Changyuan (7, 8); Zhao, Wei (2, 3, 9); Wang, Yishan (2, 3, 9)

Author affiliation:(1) Department of Electrical and Computer Engineering, National University of Singapore, 117583, Singapore; (2) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China; (4) Haina-Intelligent Photonic System Research Center, Yangtze Delta Region Institute of Tsinghua University, Zhejiang, Jiaxing; 341006, China; (5) Second Affiliated Hospital of Soochow University, Suzhou; 215000, China; (6) College of New Materials and New Energy, Shenzhen Technology University, Shenzhen; 518118, China; (7) Hong Kong Polytechnic University Shenzhen Research Institute, Guangdong, Shenzhen, China; (8) Department of Electronic and Information Engineering, Hong Kong Polytechnic University, Kowloon, Hong Kong; (9) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China

Corresponding author:Yu, Changyuan(changyuan.yu@polyu.edu.hk)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11894

Part number:1 of 1

Issue title:Optoelectronic Devices and Integration X

Issue date:2021

Publication year:2021

Article number:118941F

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510646377

Document type:Conference article (CA)

Conference name:Optoelectronic Devices and Integration X 2021

Conference date:October 10, 2021 - October 12, 2021

Conference location:Nantong, China

Conference code:175373

Sponsor:Chinese Optical Society (COS); The Society of Photo-Optical Instrumentation Engineers (SPIE)

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">Deep Neural Network (DNN) assisted activity monitoring algorithms are investigated, aiming to discriminate three activity states, including presence without movement, nobody in bed, and presence with movement. The signal is collected from a fiber-based Mach-Zehnder Interferometer (MZI) sensor, which is placed under a 20-cm thick mattress. When people are lying on the mattress, cardiopulmonary activities will lead to the change of the phase difference of the MZI optical fiber sensor. In this paper, three kinds of DNNs are developed to investigate the classification performance, including feedforward neural network (FNN), convolutional neural network (CNN), and long short-Term memory network (LSTM). The accuracy of FNN, CNN and LSTM is 95.14%, 99.01%, and 99.37% within one second, respectively. Moreover, LSTM has low time and space complexity and better performance. The algorithms constructed can obtain high accuracy and robustness with low computational overhead and storage consumption and have broad application prospects. What's more, the MZI optical fiber sensor has many advantages such as low cost and anti-electromagnetic interference, which means that the system can be popular in medical treatment and households.<br/></div> © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

Number of references:6

Main heading:Deep neural networks

Controlled terms:Optical fibers - Long short-term memory - Feedforward neural networks - Electromagnetic pulse - Interferometers

Uncontrolled terms:A.Fibres - Activity classifications - Activity monitoring - Convolutional neural network - Fiber interferometers - Interferometer sensors - Long short-term memory network - Mach-Zehnder interferometer sensors - Memory network - Monitoring algorithms

Classification code:461.4 Ergonomics and Human Factors Engineering - 701 Electricity and Magnetism - 741.1.2 Fiber Optics - 941.3 Optical Instruments

Numerical data indexing:Percentage 9.514E+01%, Percentage 9.901E+01%, Percentage 9.937E+01%, Size 2.00E-01m

DOI:10.1117/12.2601294

Funding details: Number: 61971372, Acronym: -, Sponsor: -;Number: -, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:The authors thank the supports of Grant 15200718 from HK RGC GRF and 61971372 from National Natural Science Foundation of China.

Database:Compendex

Accession number:20210609894342

Title:Generation and Conversion Dynamics of Dual Bessel Beams with a Photonic Spin-Dependent Dielectric Metasurface

Authors:Li, Tianyue (1); Li, Xingyi (2, 3); Yan, Shaohui (2, 3); Xu, Xiaohao (4); Wang, Shuming (1, 5); Yao, Baoli (2, 3); Wang, Zhenlin (1); Zhu, Shining (1, 5)

Author affiliation:(1) National Laboratory of Solid-State Microstructures, School of Physics, College of Engineering and Applied Sciences, Nanjing University, Nanjing; 210093, China; (2) State Key Laboratory of Transient Optics, Photonics xi'An Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences (CAS), Xi'an; 710119, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China; (4) Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Nanophotonics, Jinan University, Guangzhou; 511443, China; (5) Key Laboratory of Intelligent Optical Sensing and Manipulation Ministry of Education, Nanjing; 210093, China

Corresponding author:Wang, Shuming(wangshuming@nju.edu.cn)

Source title:Physical Review Applied

Abbreviated source title:Phys. Rev. Appl.

Volume:15

Issue:1

Issue date:January 2021

Publication year:2021

Article number:A56

Language:English

E-ISSN:23317019

Document type:Journal article (JA)

Publisher:American Physical Society

Abstract:A Bessel beam has the properties of propagation invariance and a self-healing effect, leading to a variety of interesting phenomena and applications. Recently, as a planar diffractive element with miniaturized size, metasurfaces are widely employed to manipulate light in the subwavelength region, including generating a Bessel beam. However, such a metasurface-generated Bessel beam allows output light with no tunable functions. Here, with the interplay of the geometric phase and the dynamic phase, we propose a method to generate and allow conversion from any orthogonal polarizations to independent Bessel beams with a single-layer dielectric metasurface. The simulation results indicate that the arbitrary conversion between different Bessel beams is related to the spin-dependent orbit motion caused by the tight-focusing effect, leading to the singularity of the spot. This physical mechanism is well studied and the theoretical model for revealing the dependence of different incident polarization on the conversion dynamics is presented. Our approach paves a way for efficient generation and multifunctional applications, ranging from high-numerical-aperture devices to compact nanophotonic platforms for spin-dependent structured beams.<br/> © 2021 American Physical Society.

Number of references:39

Main heading:Laser beams

Controlled terms:Spin dynamics - Incident light - Light sources - Bessel functions - Polarization

Uncontrolled terms:Diffractive element - High numerical apertures - Incident polarization - Orthogonal polarizations - Physical mechanism - Propagation invariance - Self healing effect - Theoretical modeling

Classification code:741.1 Light/Optics - 744.8 Laser Beam Interactions - 921 Mathematics - 931.3 Atomic and Molecular Physics

DOI:10.1103/PhysRevApplied.15.014059

Funding details: Number: 2016YFA0202103,2017YFA0303700,2017YFA0303702, Acronym: -, Sponsor: -;Number: 11621091,11674166,11674167,11674168,11774162,11774164,11822406,11834007,91850204, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:The authors are grateful that this work is supported by the National Key R&D Program of China (Grants No. 2017YFA0303700, No. 2017YFA0303702, and No. 2016YFA0202103) and the National Natural Science Foundation of China (Grants No. 11822406, No. 11834007, No. 11774162, No. 11674166, No. 11674167, No. 11674168, No. 11621091, No. 11774164, and No. 91850204).

Database:Compendex

Accession number:20215211394018

Title:SAHS detection using contact-free MZI-BCG sensor

Authors:Jiang, Xinning (1); Xu, Wei (2, 3); Yu, Cheung Chuen (4); Sun, Wenye (5); Dong, Bo (6); Yu, Changyuan (7, 8); Zhao, Wei (2, 3, 9); Wang, Yishan (2, 3, 9)

Author affiliation:(1) School of Electronic and Information Engineering, Soochow University, 215006, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China; (4) Haina-Intelligent Photonic System Research Center, Yangtze Delta Region Institute of Tsinghua University, Zhejiang, Jiaxing; 341006, China; (5) Second Affiliated Hospital of Soochow University, Suzhou; 215000, China; (6) College of New Materials and New Energy, Shenzhen Technology University, Shenzhen; 518118, China; (7) Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen; Guangdong, China; (8) Department of Electronic and Information Engineering, Hong Kong Polytechnic University, Kowloon, Hong Kong; (9) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China

Corresponding author:Yu, Changyuan(changyuan.yu@polyu.edu.hk)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11894

Part number:1 of 1

Issue title:Optoelectronic Devices and Integration X

Issue date:2021

Publication year:2021

Article number:118941G

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510646377

Document type:Conference article (CA)

Conference name:Optoelectronic Devices and Integration X 2021

Conference date:October 10, 2021 - October 12, 2021

Conference location:Nantong, China

Conference code:175373

Sponsor:Chinese Optical Society (COS); The Society of Photo-Optical Instrumentation Engineers (SPIE)

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">Real-Time SAHS events detection system during sleep is proposed and investigated based on contact-free Mach-Zehnder Interferometer ballistocardiograph (MZI-BCG) senor, which is placed under the mattress. The breath activity influences the optical phase difference of the MZI which is demodulated with 3&lowast;3 optical coupler. In this paper, three SAHS events are successfully detected, including OSAS (Obstructive sleep apnea syndrome), CSAS (Central sleep apnea syndrome) and MSAS (Mixed sleep apnea syndrome). The proposed system is simple, cost-effective and non-invasive, which has great potential application in home monitoring<br/></div> © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

Number of references:4

Main heading:Sleep research

Controlled terms:Cost effectiveness

Uncontrolled terms:BCG - Contact free - Detection system - Events detection - MZI - Optical coupler - Optical phase difference - Real- time - SAHS - Sleep apnea syndrome

Classification code:461.4 Ergonomics and Human Factors Engineering - 911.2 Industrial Economics

DOI:10.1117/12.2601391

Funding details: Number: 61971372, Acronym: -, Sponsor: -;Number: -, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:The authors thank the supports of Grant 15200718 from HK RGC GRF and 61971372 from National Natural Science Foundation of China.

Database:Compendex

Accession number:20221311871478

Title:Polarimetric dehazing utilizing Vis-NIR spectral image fusion

Authors:Xia, Pu (1); Chen, Xiaolai (1); Gao, Xiaohui (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Key Laboratory of Spectral Imaging Technology, Xi'an; 710119, China

Corresponding author:Xia, Pu(xiapu@opt.ac.cn)

Source title:Proceedings - 2021 International Conference on Intelligent Computing, Automation and Systems, ICICAS 2021

Abbreviated source title:Proc. - Int. Conf. Intell. Comput., Autom. Syst., ICICAS

Part number:1 of 1

Issue title:Proceedings - 2021 International Conference on Intelligent Computing, Automation and Systems, ICICAS 2021

Issue date:2021

Publication year:2021

Pages:48-54

Language:English

ISBN-13:9781665428101

Document type:Conference article (CA)

Conference name:2021 International Conference on Intelligent Computing, Automation and Systems, ICICAS 2021

Conference date:December 29, 2021 - December 31, 2021

Conference location:Chongqing, China

Conference code:177603

Sponsor:Chongqing Academy of Big Data; Chongqing Big Data Technology Innovation Alliance; Chongqing Technology and Business University; Universidad Politecnica Salesiana

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">Polarimetric dehazing methods have good ability in restoring images contaminated by haze. But noise and color distortion come along with the dehazing process, and those methods lack the ability to recover targets of long-distance. Our previous study has shown that the penetration ability of light is related with wavelength, light of long wavelength, especially in the infrared band, receives less attenuation from haze. Based on that fact, we decompose the dehazing process into 16 different spectral bands to achieve the optimized dehazing performance. An infrared band is added to enhance the dehazing performance in short-wavelength channels, thus increases the range of visibility and corrects the color distortion. The dehazed image is reconstructed through image fusion of the dehazed bands. Experimental analyses reveal enhanced details and reduced noise of dehazed images. Particularly, our method works well in retaining the color information of haze contaminated images. The amount of blueshift can be reduced by 71% at least.<br/></div> © 2021 IEEE.

Number of references:21

Main heading:Demulsification

Controlled terms:Color - Image analysis - Image enhancement - Image fusion - Image reconstruction - Polarimeters - Spectroscopy - Spectrum analysis

Uncontrolled terms:Color distortions - Color image restoration - Dehazing - Haze removal - Images processing - Infrared bands - Noise distortions - Performance - Polarimetric imaging - Spectral image fusions

Classification code:723.2 Data Processing and Image Processing - 741.1 Light/Optics - 802.3 Chemical Operations - 941.3 Optical Instruments

Numerical data indexing:Percentage 7.10E+01%

DOI:10.1109/ICICAS53977.2021.00017

Funding details: Number: 2015DFA10140, Acronym: -, Sponsor: -;Number: 61905275, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: XAB2017B23, Acronym: -, Sponsor: West Light Foundation of the Chinese Academy of Sciences;

Funding text:ACKNOWLEDGMENT This work was supported by the International Cooperation Program of China (2015DFA10140), National Nature Science Foundation of China (61905275), Western Lights Foundation of Chinese Academy of Sciences (XAB2017B23), and the Open Research Fund of CAS Key Laboratory of Spectral Imaging Technology.

Database:Compendex

Accession number:20211410162270

Title:Research on precision measurement and assembly technology of fery prism

Authors:Fu, Xihong (1, 2); Li, Libo (1, 2); Ma, Nana (1); Chou, Xiaoquan (1); Kang, Shifa (1); Li, Hua (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China; (2) Key Laboratory of Spectral Imaging Technology of CAS, Xi'an; 710119, China

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11763

Part number:1 of 1

Issue title:Seventh Symposium on Novel Photoelectronic Detection Technology and Applications

Issue date:2021

Publication year:2021

Article number:1176304

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510643611

Document type:Conference article (CA)

Conference name:7th Symposium on Novel Photoelectronic Detection Technology and Applications

Conference date:November 5, 2020 - November 7, 2020

Conference location:Kunming, China

Conference code:167886

Sponsor:Chinese Society for Optical Engineering (CSOE); Science and Technology on Low-light-level Night Vision Laboratory

Publisher:SPIE

Abstract:From the special structure, processing technology and function of Fery prism in spectral imager, and the structural design features of a certain research spectral imager project, an assembly measurement method based on CMM, PSM and high precision rotating device is proposed, which combines the principles of space measurement, point source collimation and 3D mathematical modeling, the on-line inspection and alignment technology of Fery prism assembly are studied. Firstly, the key parameters of a single curved prism, such as curvature radius of surface, spherical coordinates, deflection angle of optical axis and off-axis are measured by CMM. Secondly, the Fery prism assembly is assembled by CMM, PSM and high precision rotating device. The space coordinates between the components are measured by CMM, and the position of the Spherical Center and the deflection angle are precisely determined by point source microscope. Finally, the actual assembly effect of the Fery Prism Assembly is reappeared through the data processing of the computer software, and the directional offset between the Fery prism assembly and the theoretical model is given, the precision assembly of Fery prism aseembly is completed by azimuth rotation and trimming mat processing. It provides a new technology method for on-line precision assembly of Fery prism module in Spectral Imager, which has strong operability and high measurement precision, and is suitable for precision detection and assembly of Fery prism module of different sizes.<br/> © 2021 SPIE

Number of references:11

Main heading:Spectroscopy

Controlled terms:Structural design - Functions - Data handling - Prisms - 3D modeling

Uncontrolled terms:Measurement precision - Point source microscopes - Precision assemblies - Precision detections - Precision measurement - Processing technologies - Spherical coordinates - Theoretical modeling

Classification code:408.1 Structural Design, General - 723.2 Data Processing and Image Processing - 741.3 Optical Devices and Systems - 921 Mathematics

DOI:10.1117/12.2584980

Database:Compendex

Accession number:20220211450723

Title:Analysis of the internal stray radiation in infrared imaging system based on ambient temperature

Authors:Shen, Lamei (1, 2); Li, Zhiguo (1, 2); Liu, Kai (1, 2)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Li, Zhiguo(lzg@opt.ac.cn)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12061

Part number:1 of 1

Issue title:AOPC 2021: Infrared Device and Infrared Technology

Issue date:2021

Publication year:2021

Article number:120611D

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510649972

Document type:Conference article (CA)

Conference name:2021 Applied Optics and Photonics China: Infrared Device and Infrared Technology, AOPC 2021

Conference date:June 20, 2021 - June 22, 2021

Conference location:Beijing, China

Conference code:175862

Sponsor:Chinese Society for Optical Engineering

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">When the infrared imaging system measuring the radiation characteristics of the target, the internal stray radiation is an important factor affecting the measurement results, and the environmental temperature will directly lead to the change of the internal stray radiation. This paper analyzes the phenomenon of the gray drift of the system output caused by the environmental temperature change, and derives the functional relationship between the drift amount and the ambient temperature. A simulation analysis model of internal stray radiation was established to verify the theoretical analysis.<br/></div> Copyright © 2021 SPIE.

Number of references:10

Main heading:Temperature

Controlled terms:Imaging systems - Stray light - Thermography (imaging)

Uncontrolled terms:Environmental temperature - Gray drift - Infrared imaging systems - Internal stray radiation - Paper analysis - Radiation characteristics - Radiometric calibrations - Simulation analysis - Stray radiation - System output

Classification code:641.1 Thermodynamics - 741.1 Light/Optics - 742.1 Photography - 746 Imaging Techniques

DOI:10.1117/12.2606696

Database:Compendex

Accession number:20211210117108

Title:Design of Φ450 mm light-weighted SiC mirror subsystem in space-based astronomy telescope

Title of translation:Φ450 mm口径空间天文相机轻量化碳化硅主反射镜组件设计

Authors:Feng, Liangjie (1); Cheng, Pengfei (1); Wang, Wei (1)

Author affiliation:(1) The Space Optical Technology Research Department, Xi'an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi'an; 710119, China

Source title:Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering

Abbreviated source title:Hongwai yu Jiguang Gongcheng Infrared Laser Eng.

Volume:50

Issue:2

Issue date:February 25, 2021

Publication year:2021

Article number:20200175

Language:Chinese

ISSN:10072276

Document type:Journal article (JA)

Publisher:Chinese Society of Astronautics

Abstract:A Φ450 mm primary mirror subsystem of a space-based astronomy telescope was designed with mass, optical surface distortion and reflectivity requirement. The open-back primary mirror was made of pressure-less sintering silicon carbide, light-weighted at a ratio of approximately 70%. Three side supporting invar flexure bipods were designed to minimize the assembling stress and the thermal stress. The high reflection was obtained from the optical surface cementite. The mirror weighted 7 kg and the reflectivity was 98% after optical polishing. The mirror subsystem was precisely assembled under the strict technical condition. The optical test with interferometer show that the optical surface distortion is less than 0.02λ RMS, which meet the critical optical requirements for the primary mirror of the space-based astronomy telescope.<br/> Copyright ©2021 Infrared and Laser Engineering. All rights reserved.

Number of references:14

Main heading:Mirrors

Controlled terms:Sintering - Reflection - Silicon carbide - Telescopes

Uncontrolled terms:Optical polishing - Optical surfaces - Pressure-less sintering - Primary mirrors - SiC mirrors - Space-based - Technical conditions

Classification code:741.3 Optical Devices and Systems - 804.2 Inorganic Compounds

Numerical data indexing:Mass 7.00e+00kg, Percentage 7.00e+01%, Percentage 9.80e+01%

DOI:10.3788/IRLA20200175

Funding text:Space Variable Objects Monitor

Database:Compendex

Accession number:20204609496783

Title:A compact bionic compound eye camera for imaging in a large field of view

Authors:Wang, Yuanyuan (1); Shi, Chengyong (3); Xu, Huangrong (2); Zhang, Yuanjie (2); Yu, Weixing (2)

Author affiliation:(1) School of Science, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) Key Laboratory of Spectral Imaging Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, No. 17, Xinxi Road, Xian; 710119, China; (3) State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics & Physics, Chinese Academy of Sciences, No. 3888, Dongnanhu Road, Changchun; Jinlin, China

Corresponding author:Yu, Weixing(yuwx@opt.ac.cn)

Source title:Optics and Laser Technology

Abbreviated source title:Opt Laser Technol

Volume:135

Issue date:March 2021

Publication year:2021

Article number:106705

Language:English

ISSN:00303992

CODEN:OLTCAS

Document type:Journal article (JA)

Publisher:Elsevier Ltd

Abstract:The traditional imaging technologies, such as two-dimensional imaging, have not been able to meet people's needs for higher technology. Inspired by the characteristics, such as small size, sensitivity to moving targets and large field of view, researchers began to study bionic compound eyes. In this paper, a hemispherical mounting surface with through holes to set the compound lens array is fabricated by 3-D printing technology. More than one hundred small lenses are mounted on the 3-D printed hemispherical surface to form a bionic curved compound eye, which is then integrated with an optical relay system and an CMOS imaging sensor to form a rather compact bionic compound eye camera. The addition of the optical relay system solves the problem that the mismatch between the curved focal plane formed by the curved compound eye and the flat focal plane of the CMOS imaging sensor. By employing this method, we design and analyze the curved lens array and optical relay system, and perform the related optical performance tests on the fabricated bionic curved compound eye imaging system. The results show that a good image quality can be achieved. The formed bionic compound eye imaging prototype system rather compact and has a weight of only 121 g, a volume of 34 mm × 44 mm × 80 mm, and a field of view of 120° × 120°. This system has great potential and value in military, medical, and engineering applications.<br/> © 2020 Elsevier Ltd

Number of references:25

Main heading:Lenses

Controlled terms:Cameras - CMOS integrated circuits - Military applications - Bionics - Focusing - Imaging systems

Uncontrolled terms:Bionic compound eye - CMOS imaging sensor - Curved lens arrays - Engineering applications - Hemispherical surfaces - Large field of views - Optical performance - Two-dimensional imaging

Classification code:404.1 Military Engineering - 461.1 Biomedical Engineering - 714.2 Semiconductor Devices and Integrated Circuits - 741.3 Optical Devices and Systems - 742.2 Photographic Equipment - 746 Imaging Techniques

Numerical data indexing:Mass 1.21e-01kg, Size 8.00e-02m

DOI:10.1016/j.optlastec.2020.106705

Funding details: Number: 2019JM-302, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;Number: 61975231, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:This research was funded by National Science Foundation of China (NSFC) (61975231) and Natural Science Foundation of Shaanxi Province (2019JM-302).

Database:Compendex

Accession number:20220211446980

Title:Research on nutation coupling method for space laser communication

Authors:Zhao, Yue (1, 2); Han, Junfeng (2); Meng, Xiangsheng (2); Chang, Zhiyuan (2); Xie, Xiaoping (2)

Author affiliation:(1) University of Chinese Academy of Sciences, Beijing; 100049, China; (2) Xi'An Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China

Corresponding author:Han, Junfeng(hanjf@opt.ac.cn)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12060

Part number:1 of 1

Issue title:AOPC 2021: Advanced Laser Technology and Applications

Issue date:2021

Publication year:2021

Article number:120601G

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510649958

Document type:Conference article (CA)

Conference name:2021 Applied Optics and Photonics China: Advanced Laser Technology and Applications, AOPC 2021

Conference date:June 20, 2021 - June 22, 2021

Conference location:Beijing, China

Conference code:175856

Sponsor:Chinese Society for Optical Engineering

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">With the rapid development of the times, traditional communication methods such as microwave communication have been difficult to meet the needs of high-speed and high-capacity communication. People begin to look for new communication technologies to replace the existing communication methods. Laser communication has the advantages of high bandwidth, small terminal volume and good security. In the process of space laser communication, the coupling of space light to single-mode fiber is one of the difficulties. In the process of practical application, external jitter (atmospheric turbulence, platform vibration, etc.) makes the focus spot offset from the end face of the optical fiber, greatly reduces the energy coupled into the single-mode optical fiber, and seriously affects the communication quality. Applying the mature optical fiber communication technology to space laser communication can not only improve the transmission rate of the link, but also improve the communication quality and simplify the system composition. Based on laser nutation, aiming at the problem of space optical coupling into single-mode fiber in space laser communication, this paper analyzes the influence of alignment error on coupling efficiency. The lateral deviation has the greatest influence. In this paper, a laser nutation coupling system model based on the fast mirror is built. The model is based on the principle of mode field matching. The nutation signal of the nutation fast mirror is used as the modulation signal, and the optical power output by the photodetector is used as the feedback for calculation. The fast mirror is controlled in real time to compensate the transverse deviation. The algorithm flow of laser nutation is described, the simulation model is built, and the feasibility of the algorithm is verified. Based on different algorithm parameters such as nutation radius and convergence step, the relationship between parameter value and algorithm performance is obtained.<br/></div> © 2021 SPIE.

Number of references:8

Main heading:Single mode fibers

Controlled terms:Optical fiber communication - Laser mirrors - Atmospheric turbulence - Optical fiber coupling

Uncontrolled terms:Communication method - Communication quality - Coupling methods - Fast-steering mirrors - High-capacity communications - High-speed capacity - Laser nutation - Microwave communications - Single-mode fibers - Space laser communication

Classification code:443.1 Atmospheric Properties - 631.1 Fluid Flow, General - 717.1 Optical Communication Systems - 741.1.2 Fiber Optics - 741.3 Optical Devices and Systems - 744.7 Laser Components

DOI:10.1117/12.2606800

Database:Compendex

Accession number:20220211446432

Title:Modulated optical signal detection based on cross-correlation algorithm

Authors:Zeng, Ke (1, 2); Han, Junfeng (2); Wang, Haitao (2); Wang, Chen (2); Xie, Xiaoping (2)

Author affiliation:(1) University of Chinese Academy of Sciences, Beijing; 100049, China; (2) Xi'An Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China

Corresponding author:Han, Junfeng(hanjf@opt.ac.cn)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12060

Part number:1 of 1

Issue title:AOPC 2021: Advanced Laser Technology and Applications

Issue date:2021

Publication year:2021

Article number:1206011

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510649958

Document type:Conference article (CA)

Conference name:2021 Applied Optics and Photonics China: Advanced Laser Technology and Applications, AOPC 2021

Conference date:June 20, 2021 - June 22, 2021

Conference location:Beijing, China

Conference code:175856

Sponsor:Chinese Society for Optical Engineering

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">With the development of the information age, the transmission rate and transmission capacity of information continue to increase. As a wireless communication method to achieve high bit rate communication, space laser communication plays an increasingly obvious role in global communications. In the current space laser communication system, the optical communication terminal uses a detector to detect the position of the received optical signal, and then the servo mechanism on it performs facula tracking. However, when a four-quadrant detector (4QD) is used to detect optical signal, the received optical signal generally contains three main types of noise, which are background radiation noise, shot noise and thermal noise. These three kinds of noise can be equivalent to Gaussian white noise. In this paper, a single-frequency cosine signal is used to modulate the intensity of the optical signal received by the 4QD, and then the modulated optical signal is detected by a spectrum analysis method based on the cross-correlation algorithm. This method reduces the relative error of the spectral line amplitude when the SNR is -5dB from 2.23% to 0.88%, and reduces the relative error of the spectral line amplitude when the SNR is -20dB from 17.6% to 5.49%. Therefore, this method can well suppress Gaussian white noise and improve the detection accuracy of modulated optical signal under extremely low SNR conditions.<br/></div> © 2021 SPIE.

Number of references:9

Main heading:Shot noise

Controlled terms:Spectroscopy - Correlation detectors - Signal detection - Optical correlation - Gaussian noise (electronic) - Optical signal processing - Signal to noise ratio - Spectrum analysis - White noise - Optical communication - Thermal noise

Uncontrolled terms:Cross-correlation algorithm - Extremely low SNR - Gaussian white noise - Low SNR - Modulated optical signal - Optical signal detection - Optical signals - Relative errors - Space laser communication - Spectral line

Classification code:716.1 Information Theory and Signal Processing - 717.1 Optical Communication Systems - 741.1 Light/Optics

Numerical data indexing:Decibel -2.00E+01dB, Decibel -5.00E+00dB, Percentage 1.76E+01% to 5.49E+00%, Percentage 2.23E+00% to 8.80E-01%

DOI:10.1117/12.2606529

Database:Compendex

Accession number:20220211437960

Title:Laser collimation beam expansion design based on the Galileo structure

Authors:He, Xuan (1, 2); Bai, Jianming (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12065

Part number:1 of 1

Issue title:AOPC 2021: Optical Sensing and Imaging Technology

Issue date:2021

Publication year:2021

Article number:1206532

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510650053

Document type:Conference article (CA)

Conference name:2021 Applied Optics and Photonics China: Optical Sensing and Imaging Technology, AOPC 2021

Conference date:June 20, 2021 - June 22, 2021

Conference location:Beijing, China

Conference code:175876

Sponsor:Chinese Society for Optical Engineering

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">Starting from the collimated beam to be solved by the lighting system, based on the Gaussian optical theory, the transformation of Gaussian beam through the lens is deduced, the principle of large magnification collimating and expanding beam system is analyzed, and the design of collimating and expanding beam system changing the laser beam diameter and divergence angle is realized. It is verified by simulation, which meets the requirements of the lighting system for parallel light incidence.<br/></div> © 2021 SPIE.

Number of references:6

Main heading:Gaussian beams

Controlled terms:Laser beams - Laser theory - Expansion - Lenses

Uncontrolled terms:Array lighting - Beam expansion - Beam system - Collimate beam expansion - Collimated beams - GALILEO - Gaussians - Laser collimation - Lighting systems - Optical theory

Classification code:711 Electromagnetic Waves - 741.3 Optical Devices and Systems - 744.1 Lasers, General - 744.8 Laser Beam Interactions - 951 Materials Science

DOI:10.1117/12.2606813

Database:Compendex

Accession number:20214911290233

Title:Cross-Domain Scene Classification by Integrating Multiple Incomplete Sources

Authors:Gong, Tengfei (1); Zheng, Xiangtao (1); Lu, Xiaoqiang (1)

Author affiliation:(1) Key Laboratory of Spectral Imaging Technology Cas, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China

Corresponding author:Zheng, Xiangtao(xiangtaoz@gmail.com)

Source title:IEEE Transactions on Geoscience and Remote Sensing

Abbreviated source title:IEEE Trans Geosci Remote Sens

Volume:59

Issue:12

Issue date:December 1, 2021

Publication year:2021

Pages:10035-10046

Language:English

ISSN:01962892

E-ISSN:15580644

CODEN:IGRSD2

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">Cross-domain scene classification identifies scene categories by learning knowledge from a labeled data set (source domain) to an unlabeled data set (target domain), where the source data and the target data are sampled from different distributions. A lot of domain adaptation methods are used to reduce the distribution shift across domains, and most existing methods assume that the source domain shares the same categories with the target domain. It is usually hard to find a source domain that covers all categories in the target domain. Some works exploit multiple incomplete source domains to cover the target domain. However, in such setting, the categories of each source domain are a subset of the target-domain categories, and the target domain contains 'unknown' categories for each source domain. The existence of unknown categories results in the conventional domain adaptation unsuitable. Known and unknown categories should be treated separately. Therefore, a separation mechanism is proposed to separate the known and unknown categories in this article. First, multiple-source classifiers trained on the multiple source domains are used to coarsely separate the known/unknown categories in the target domain. The target images with high similarities to source images are selected as known categories, and the target images with low similarities are selected as unknown categories. Then, a binary classifier trained using the selected images is used to finely separate all target-domain images. Finally, only the known categories are implemented in the cross-domain alignment and classification. The target images get labels by integrating the hypotheses of multiple-source classifiers on the known categories. Experiments are conducted on three cross-domain data sets to demonstrate the effectiveness of the proposed method.<br/></div> © 1980-2012 IEEE.

Number of references:43

Main heading:Classification (of information)

Controlled terms:Separation

Uncontrolled terms:Cross-domain - Cross-domain scene classification - Data set - Domain adaptation - Incomplete source - Multi-Sources - Multisource domain adaptation - Scene classification - Target domain - Unknown category

Classification code:716.1 Information Theory and Signal Processing - 802.3 Chemical Operations - 903.1 Information Sources and Analysis

DOI:10.1109/TGRS.2020.3034344

Funding details: Number: 2020KJXX-091,2020TD-015, Acronym: -, Sponsor: -;Number: QYZDYSSW-JSC044, Acronym: -, Sponsor: -;Number: 61702498,61772510,61806193, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: QYZDB-SSW-JSC015,XAB2017B26, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 61925112, Acronym: -, Sponsor: National Science Fund for Distinguished Young Scholars;Number: 2019JQ-340, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;

Funding text:This work was supported in part by the National Science Found for Distinguished Young Scholars under Grant 61925112; in part by the National Natural Science Foundation of China under Grant 61806193, Grant 61702498, and Grant 61772510; in part by the Young Top-Notch Talent Program of Chinese Academy of Sciences under Grant QYZDB-SSW-JSC015; in part by the CAS "Light of West China" Program under Grant XAB2017B26; in part by the Innovation Capability Support Program of Shaanxi under Grant 2020KJXX-091 and Grant 2020TD-015; in part by the Natural Science Basic Research Program of Shaanxi under Grant 2019JQ-340; in part by the Key Research Program of Frontier Sciences, Chinese Academy of Sciences, under Grant QYZDYSSW-JSC044; and in part by the National High Resolution Earth Observation Foundation for Young Scientists of China.

Database:Compendex

Accession number:20220911715508

Title:Sequential three-branch decision method based on Bayesian principle

Authors:Zeng, Ke (1, 2); Ran, Junfeng (2)

Author affiliation:(1) University of Chinese Academy of Sciences, Beijing; 100049, China; (2) Xi'An Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China

Source title:Proceedings of the 33rd Chinese Control and Decision Conference, CCDC 2021

Abbreviated source title:Proc. Chin. Control Decis. Conf., CCDC

Part number:1 of 1

Issue title:Proceedings of the 33rd Chinese Control and Decision Conference, CCDC 2021

Issue date:2021

Publication year:2021

Pages:3902-3907

Language:English

ISBN-13:9781665440899

Document type:Conference article (CA)

Conference name:33rd Chinese Control and Decision Conference, CCDC 2021

Conference date:May 22, 2021 - May 24, 2021

Conference location:Kunming, China

Conference code:174987

Sponsor:Chinese Association of Automation, State Key Laboratory of Synthetical Automation for Process Industries; IEEE Control Systems Society (CSS); IEEE Technical Committee on Control Theory; Northeastern University

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">In this paper, the sequential three-branch decision method based on Bayesian principle is applied to face image recognition to realize the minimum risk decision. Adding a pending area to the traditional two-branch decision can minimize the decision cost when the misclassification cost is imbalanced and the feature information of the sample is temporarily insufficient. In addition, the acquisition of sample feature information is not unlimited. Although each feature information obtained can reduce the cost of misclassification of decision, it is also necessary to consider the increased test cost of each feature information obtained. This paper used the Bayesian principle to realize the dynamic balance of them to achieve the minimum total decision cost (misclassification cost and test cost). In this paper, 2DPCA was used to obtain the granular features of face images, and experiments were conducted on face databases such as AR and PIE to verify the effectiveness of the sequential three-branch decision method based on Bayesian principle.<br/></div> © 2021 IEEE.

Number of references:12

Main heading:Statistical tests

Controlled terms:Face recognition

Uncontrolled terms:Bayesian principle - Decision cost - Decision method - Face image recognition - Feature information - Low total cost - Misclassification costs - Test cost - Three-branch - Three-branch decision method

Classification code:922.2 Mathematical Statistics

DOI:10.1109/CCDC52312.2021.9601833

Database:Compendex

Accession number:20210409805908

Title:Bidirectional Interaction Network for Person Re-Identification

Authors:Chen, Xiumei (1); Zheng, Xiangtao (1); Lu, Xiaoqiang (1)

Author affiliation:(1) CAS Key Laboratory of Spectral Imaging Technology, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China

Corresponding author:Zheng, Xiangtao(xiangtaoz@gmail.com)

Source title:IEEE Transactions on Image Processing

Abbreviated source title:IEEE Trans Image Process

Volume:30

Issue date:2021

Publication year:2021

Pages:1935-1948

Article number:9321734

Language:English

ISSN:10577149

E-ISSN:19410042

CODEN:IIPRE4

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:Person re-identification (ReID) task aims to retrieve the same person across multiple spatially disjoint camera views. Due to huge image changes caused by various factors such as posture variation and illumination transformation, images of different persons may share the more similar appearances than images of the same one. Learning discriminative representations to distinguish details of different persons is significant for person ReID. Many existing methods learn discriminative representations resorting to a human body part location branch which requires cumbersome expert human annotations or complex network designs. In this article, a novel bidirectional interaction network is proposed to explore discriminative representations for person ReID without any human body part detection. The proposed method regards multiple convolutional features as responses to various body part properties and exploits the inter-layer interaction to mine discriminative representations for person identities. Firstly, an inter-layer bilinear pooling strategy is proposed to feasibly exploit the pairwise feature relations between two convolution layers. Secondly, to explore interaction of multiple layers, an effective bidirectional integration strategy consisting of two different multi-layer interaction processes is designed to aggregate bilinear pooling interaction of multiple convolution layers. The interaction of multiple layers is implemented in a layer-by-layer nesting policy to ensure the two interaction processes are different and complementary. Extensive experiments validate the superiority of the proposed method on four popular person ReID datasets including Market-1501, DukeMTMC-ReID, CUHK03-NP and MSMT17. Specifically, the proposed method achieves a rank-1 accuracy of 95.1% and 88.2% on Market-1501 and DukeMTMC-ReID, respectively.<br/> © 1992-2012 IEEE.

Number of references:47

Main heading:Complex networks

Controlled terms:Commerce - Neural networks - Convolution

Uncontrolled terms:Bi-directional interaction - Human annotations - Integration strategy - Interaction process - Interlayer interactions - Multiple convolution - Multiple layers - Person re identifications

Classification code:716.1 Information Theory and Signal Processing - 722 Computer Systems and Equipment

Numerical data indexing:Percentage 8.82e+01%, Percentage 9.51e+01%

DOI:10.1109/TIP.2021.3049943

Funding details: Number: 2020KJXX-091,2020TD-015, Acronym: -, Sponsor: -;Number: 61772510,61806193, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 61925112, Acronym: -, Sponsor: National Science Fund for Distinguished Young Scholars;Number: 2019JC-23,2019JQ-340, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;

Funding text:Manuscript received June 30, 2020; revised October 22, 2020 and December 30, 2020; accepted January 4, 2021. Date of publication January 13, 2021; date of current version January 20, 2021. This work was supported in part by the Innovation Capability Support Program of Shaanxi under Grant 2020KJXX-091 and Grant 2020TD-015, in part by the National Science Fund for Distinguished Young Scholars under Grant 61925112, in part by the National Natural Science Foundation of China under Grant 61806193 and Grant 61772510, and in part by the Natural Science Basic Research Program of Shaanxi under Grant 2019JQ-340 and Grant 2019JC-23. The associate editor coordinating the review of this manuscript and approving it for publication was Dr. Liang Wang. (Corresponding author: Xiangtao Zheng.) Xiumei Chen is with the CAS Key Laboratory of Spectral Imaging Technology, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China, and also with the University of Chinese Academy of Sciences, Beijing 100049, China.

Database:Compendex

Accession number:20210509874593

Title:The design and fabrication of freeform lenses for generating complex illumination patterns on curved surfaces

Authors:Zhang, YuPeng (1, 2); Mao, Xianglong (1); Xie, Yongjun (1); Li, Jinpeng (1); Wang, Fengbiao (1); Gao, Rong (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, China

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11761

Part number:1 of 1

Issue title:Fourth International Conference on Photonics and Optical Engineering

Issue date:2021

Publication year:2021

Article number:1176120

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510643574

Document type:Conference article (CA)

Conference name:4th International Conference on Photonics and Optical Engineering

Conference date:October 15, 2020 - October 16, 2020

Conference location:Xi'an, China

Conference code:166676

Publisher:SPIE

Abstract:Freeform optics have been found in a variety of beam shaping designs. However, they are typically used to form prescribed illumination patterns on a planar surface. In this paper, we will demonstrate a ray mapping based method to design smooth freeform lenses to form complicated illumination distributions on curved surfaces. The ray mapping between the source and target is established by solving an optimal mass transportation problem which is governed by the Monge-Ampére partial differential equation. Then, the freeform lens is constructed by a geometric method based on the optimal ray mapping. Finally, the performance of the lens is verified by Monte Carlo ray tracing simulation in Zemax OpticStudio software. To show the effectiveness of the proposed method, several freeform lenses are designed as examples for a collimated light source to generate different illumination patterns on different curved surfaces. A freeform lens is also fabricated and experimented.<br/> © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

Number of references:12

Main heading:Mapping

Controlled terms:Mass transportation - Monte Carlo methods - Computer software - Design - Light sources

Uncontrolled terms:Collimated light - Curved surfaces - Freeform optics - Geometric method - Illumination distribution - Illumination patterns - Monte-Carlo ray tracing - Transportation problem

Classification code:405.3 Surveying - 723 Computer Software, Data Handling and Applications - 922.2 Mathematical Statistics

DOI:10.1117/12.2586416

Funding details: Number: 2017KW-028, Acronym: -, Sponsor: -;Number: -, Acronym: CAS, Sponsor: Chinese Academy of Sciences;

Funding text:This work was supported by the CAS "Light of West China" Shaanxi Key R&D Program (2017KW-028).

Database:Compendex

Accession number:20213910934443

Title:Soliton Burst and Bi-Directional Switching in the Platform with Positive Thermal-Refractive Coefficient Using an Auxiliary Laser

Authors:Zhao, Yanjing (1, 2); Chen, Liao (1); Zhang, Chi (1); Wang, Weiqiang (3, 4); Hu, Hao (1); Wang, Ruolan (1); Wang, Xinyu (3, 4); Chu, Sai T. (5); Little, Brent (3); Zhang, Wenfu (3, 4); Zhang, Xinliang (1)

Author affiliation:(1) Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan; 430074, China; (2) DTU Fotonik, Department of Photonics Engineering, Technical University of Denmark, Ørsteds Plads 343, Lyngby; DK-2800, Denmark; (3) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences (CAS), Xi'an; 710119, China; (4) University of Chinese Academy of Sciences, Beijing; 100049, China; (5) Department of Physicsand Materials Science, City University of Hong Kong, 999077, Hong Kong

Corresponding authors:Zhang, Xinliang(xlzhang@mail.hust.edu.cn); Zhang, Wenfu(wfuzhang@opt.ac.cn)

Source title:Laser and Photonics Reviews

Abbreviated source title:Laser Photon. Rev.

Volume:15

Issue:11

Issue date:November 2021

Publication year:2021

Article number:2100264

Language:English

ISSN:18638880

E-ISSN:18638899

Document type:Journal article (JA)

Publisher:John Wiley and Sons Inc

Abstract:<div data-language="eng" data-ev-field="abstract">Dissipative Kerr solitons in optical microresonators enable the generation of stable ultrashort pulses and phase-locked frequency combs, leading to their widespread applications. For traditional platforms with positive thermal-refractive coefficient, strong thermal effect increases the difficulties of soliton triggering and prohibits the deterministic control of soliton number. Here, using an auxiliary laser to tune thermal effect, soliton burst and bi-directional switching are demonstrated in high-index doped silica glass platform. First, by varying the parameters of the auxiliary laser, the thermal effect tuning of the microresonator is studied with different thermal compensation states achieved, leading to distinct soliton switching features. Especially, the solitons burst and bi-directional switch in over-compensated state. The corresponding process is recorded in real time based on a temporal magnification system, uncovering transient dynamics from continuum background noise to soliton formation. Finally, the deterministic generation of solitons is enabled with controllable soliton number spanning from 1 to 21. The present work provides insight into soliton dynamics and enables soliton generation on demand with a large range of soliton numbers inside a single device.<br/></div> © 2021 Wiley-VCH GmbH

Number of references:45

Main heading:Solitons

Controlled terms:Microresonators - Silica

Uncontrolled terms:Bi-directional - Deterministics - Directional switching - Frequency combs - Higher index - Kerr solitons - Optical microresonators - Phase-locked frequency - Thermal - Ultrashort-pulse

Classification code:741.1 Light/Optics - 744.7 Laser Components

DOI:10.1002/lpor.202100264

Funding details: Number: 61505060,61631166003,61675081,61735006,61927817,62005090, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: -, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2018M640692, Acronym: -, Sponsor: China Postdoctoral Science Foundation;Number: 2019YFB2203102, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Funding text:Y.Z. and L.C. contributed equally to this work. The authors gratefully acknowledged Prof. Kerry Vahala for helpful discussions and valuable suggestions for our work. The authors thank Xi'an Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences (CAS) for device fabrication. The authors thank Prof. Heng Zhou for heplful discussion of the thermal effect simulations. The work was supported by National Key Research and Development Project (Grant No. 2019YFB2203102), the National Science Foundation of China (NSFC) (Grant Nos. 61927817, 61735006, 61631166003, 61675081, 61505060, and 62005090), China Postdoctoral Science Foundation (Grant No. 2018M640692).Y.Z. and L.C. contributed equally to this work. The authors gratefully acknowledged Prof. Kerry Vahala for helpful discussions and valuable suggestions for our work. The authors thank Xi'an Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences (CAS) for device fabrication. The authors thank Prof. Heng Zhou for heplful discussion of the thermal effect simulations. The work was supported by National Key Research and Development Project (Grant No. 2019YFB2203102), the National Science Foundation of China (NSFC) (Grant Nos. 61927817, 61735006, 61631166003, 61675081, 61505060, and 62005090), China Postdoctoral Science Foundation (Grant No. 2018M640692).

Database:Compendex

Accession number:20220211438130

Title:Three-dimensional reconstruction technique based on triangular phase shift and complementary gray code

Authors:Gao, Ruixue (1, 2); Zhang, Pengchang (1); Wang, Pengchong (1); Ling, Xi (1, 2)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China; (2) University of Chinese Academy of Science, Beijing; 100049, China

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12065

Part number:1 of 1

Issue title:AOPC 2021: Optical Sensing and Imaging Technology

Issue date:2021

Publication year:2021

Article number:120652E

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510650053

Document type:Conference article (CA)

Conference name:2021 Applied Optics and Photonics China: Optical Sensing and Imaging Technology, AOPC 2021

Conference date:June 20, 2021 - June 22, 2021

Conference location:Beijing, China

Conference code:175876

Sponsor:Chinese Society for Optical Engineering

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">Structured light 3D reconstruction technology has the advantages of non-contact, low cost and high reliability, and is widely used in industrial parts defect detection, cultural relics 3D digitization and other fields. As the core part of structured light, coding method is the key element to obtain 3D scene information, which directly affects the accuracy of 3D reconstruction. The combination of gray coding and phase shifting is a typical method for 3D shape measurement. However, due to the complexity of sinusoidal fringe calculation, and the fringe pattern boundary cannot be strictly aligned, there is a step change problem, which limits the application of this method in the field of real-time high-speed three-dimensional measurement. In this paper, the phase shift method of triangular wave and gray coding are combined to measure the 3D morphology. The triangular wave function only uses two raster images and the phase information can be obtained by simple intensity ratio calculation. The binary defocus technique can shorten the projection time, but it blurs the edge boundary of gray code and aggravates the step problem of reconstruction of object surface. In order to solve this problem, the complementary gray code whose fringe width is half of the sinusoidal fringe period is used to correct the period deviation. The experimental results show that the proposed method can reduce the number of fringe projection, simplify the calculation steps and shorten the time of data processing, so it is feasible.<br/></div> © 2021 SPIE.

Number of references:10

Main heading:Wave functions

Controlled terms:Image reconstruction - Morphology - Costs - Data handling

Uncontrolled terms:3D reconstruction - Gray codes - Gray coding - Low-high - Non-contact - Reconstruction techniques - Shift-and - Structured Light - Three-dimensional reconstruction - Triangular wave

Classification code:723.2 Data Processing and Image Processing - 911 Cost and Value Engineering; Industrial Economics - 921 Mathematics - 931.2 Physical Properties of Gases, Liquids and Solids - 951 Materials Science

DOI:10.1117/12.2606547

Database:Compendex

Accession number:20220211438051

Title:Automatic checkerboard corner detection combined with gray features and energy minimization (ADGE)

Authors:Wang, YuanZhang (1, 2); Gao, Xiaohui (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China; (2) University of Chinese Academy of Science, Beijing; 100049, China

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12065

Part number:1 of 1

Issue title:AOPC 2021: Optical Sensing and Imaging Technology

Issue date:2021

Publication year:2021

Article number:1206507

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510650053

Document type:Conference article (CA)

Conference name:2021 Applied Optics and Photonics China: Optical Sensing and Imaging Technology, AOPC 2021

Conference date:June 20, 2021 - June 22, 2021

Conference location:Beijing, China

Conference code:175876

Sponsor:Chinese Society for Optical Engineering

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">In the camera calibration process, the checkerboard pattern has a wide range of applications. Aiming at the current checkerboard corner detection algorithms that have missed and misdetected situations, this paper proposes an automatic checkerboard corner detection algorithm that combines gray-scale features and energy minimization(ADGE). The ADGE first uses the proposed two sets of gray-level symmetry operators to process the image separately to extract the candidate corner points, and then uses the regional block mode to dynamically search for the local maximum value of the candidate corner points. It further constructs a reaction function to linearly solve the sub-pixel coordinates, and finally extracts all checkerboard corner points and sorts them by minimizing the energy function. Experimental results show that the corner points extracted by the ADGE have no missed and false detection, and the corner reprojection accuracy is 0.1298 pixels. The ADGE can meet the requirements of camera calibration and provide it with high-precision data.<br/></div> © 2021 SPIE.

Number of references:15

Main heading:Pixels

Controlled terms:Signal detection - Calibration - Cameras - Feature extraction - Edge detection

Uncontrolled terms:Camera calibration - Checkerboard corner - Corner detection - Corner point - Detection algorithm - Energy minimization - Gray features - Gray-level - Gray-level symmetry operator - Non-maximum suppression

Classification code:716.1 Information Theory and Signal Processing - 742.2 Photographic Equipment

DOI:10.1117/12.2601236

Database:Compendex

Accession number:20220211444601

Title:Error compensation of laser tracker in multi-station measurement

Authors:Wang, Ruiyan (1, 2); She, Wenji (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics of Cas, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:She, Wenji(she_wj@opt.ac.cn)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12069

Part number:1 of 1

Issue title:AOPC 2021: Novel Technologies and Instruments for Astronomical Multi-Band Observations

Issue date:2021

Publication year:2021

Article number:120690Y

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510650138

Document type:Conference article (CA)

Conference name:2021 Applied Optics and Photonics China: Novel Technologies and Instruments for Astronomical Multi-Band Observations, AOPC 2021

Conference date:June 20, 2021 - June 22, 2021

Conference location:Beijing, China

Conference code:175885

Sponsor:Chinese Society for Optical Engineering

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">In order to improve the multi station measurement accuracy of laser tracker, aiming at the problem that the measurement error of laser tracker restricts the transfer accuracy, the compensation method of measurement error of single laser tracker in multi-station measurement is studied in this paper. The compensated coordinate measurement values are substituted into the coordinate transformation model, and the weighted total least square method is used to iteratively solve the transfer parameters. The results are verified by Matlab simulation experiments. The results show that the mean square errors of coordinate points before and after compensation are respectively 0.4358μm and 0.2920μm. The data show that the measurement accuracy of the laser tracker is improved by 30%.<br/></div> © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

Number of references:10

Main heading:Error compensation

Controlled terms:Mean square error - Least squares approximations - MATLAB - Measurement errors - Iterative methods

Uncontrolled terms:Compensation method - Coordinate calibration - Coordinate measurements - Coordinate transformations - Laser tracker - Measurement accuracy - Methods of measurement - Multi-station measurements - Single lasers - Transformation modeling

Classification code:723.5 Computer Applications - 921 Mathematics - 921.6 Numerical Methods - 922.2 Mathematical Statistics

Numerical data indexing:Percentage 3.00E+01%, Size 2.92E-07m, Size 4.358E-07m

DOI:10.1117/12.2606674

Database:Compendex

Accession number:20214311046490

Title:Mass-property Identification System for Three-axis Air Bearing Table Based on Simulated annealing Algorithm and Fading Memory Filter

Authors:Wang, Zhenyu (1); Li, Zening (2); Xu, Xu (2); Li, Zhiguo (1); Ma, Guangcheng (2); Xia, Hongwei (2)

Author affiliation:(1) Xi'An Institute of Optics and Precision Mechanics of Cas, Xi'An; 710119, China; (2) Harbin Institute of Technology, School of Astronautics, Harbin; 150001, China

Source title:Chinese Control Conference, CCC

Abbreviated source title:Chinese Control Conf., CCC

Volume:2021-July

Part number:1 of 1

Issue title:Proceedings of the 40th Chinese Control Conference, CCC 2021

Issue date:July 26, 2021

Publication year:2021

Pages:1201-1206

Language:English

ISSN:19341768

E-ISSN:21612927

ISBN-13:9789881563804

Document type:Conference article (CA)

Conference name:40th Chinese Control Conference, CCC 2021

Conference date:July 26, 2021 - July 28, 2021

Conference location:Shanghai, China

Conference code:172297

Sponsor:Chinese Association of Automation (CAA); Shanghai University; Systems Engineering Society of China; Technical Committee on Control Theory, Chinese Association of Automation (TCCT)

Publisher:IEEE Computer Society

Abstract:<div data-language="eng" data-ev-field="abstract">The mass property of the three-axis air bearing table is unknown when simulating the attitude and orbital motion of a satellite. This paper builds a mathematical model for the identification of the quality characteristics of the three-axis air bearing table. An identification method for the quality characteristics of a three-axis air bearing table based on the simulated annealing algorithm (SA) is proposed. To improve the identification accuracy, a method for identifying the quality characteristics of a three-axis air bearing table based on the fading memory filter (FM) is proposed. The mass-property identification system uses flywheels as the excitation source of the three-axis air bearing and uses the inertial measurement unit (IMU) to measure the angular velocity. The results show that the moment of inertia identification error of the SA algorithm is about 3.48%, and it is capable of getting away from local optimum. The moment of inertia identification error based on the FM filter is less than 2% with faster convergence speed and higher identification accuracy.<br/></div> © 2021 Technical Committee on Control Theory, Chinese Association of Automation.

Number of references:11

Main heading:Simulated annealing

Controlled terms:Air - Bearings (machine parts) - Orbits

Uncontrolled terms:Air bearing tables - Annealing algorithm - Fading memory filter - Mass properties - Mass-property identification - Property identification - Quality characteristic - Simulated annealing algorithm - Three axes - Three-axis air bearing table

Classification code:537.1 Heat Treatment Processes - 601.2 Machine Components - 804 Chemical Products Generally

Numerical data indexing:Percentage 2.00E+00%, Percentage 3.48E+00%

DOI:10.23919/CCC52363.2021.9550654

Funding details: Number: 61304108, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:*This work is supported by National Natural Science Foundation (NNSF) of China under Grant 61304108.

Database:Compendex

Accession number:20220811682269

Title:Novel Structure Design of Circle Support Component for a Primary Reflective Mirror with Large Diameter

Authors:Song, Yang (1); Ye, Jing (1, 2); Shen, Zhong (1); Ma, Tengfei (1); Hu, Yongming (1); Wang, Wei (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Ye, Jing(yejing@opt.ac.cn)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12070

Part number:1 of 1

Issue title:10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes

Issue date:2021

Publication year:2021

Article number:120700H

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510650152

Document type:Conference article (CA)

Conference name:10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes 2021

Conference date:June 14, 2021 - June 17, 2021

Conference location:Chengdu, China

Conference code:176905

Sponsor:Institute of Optics and Electronics (IOE), Chinese Academy of Sciences; The Chinese Optical Society (COS)

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">With the rapid progress of technology and manufacture, the number of telescopes in space is mounting dramatically. Considering launch cost, more and more engineers nowadays pursue lightweight and compact design of telescope in space. Traditional design scheme usually has a support plate for primary reflective mirror. It will take some space for other parts. The paper, taking a primary reflective mirror with 600mm in diameter as an example, put forward a novel design of circle support component instead of traditional support plate. It utilized a special structural layout to save more space. The paper specified this design scheme and made comparison between these two design schemes. The paper also gave the assembling method of the primary reflective mirror and circle support component, which would verify its feasibility in engineering practice in a virtual way. The novel structure design in this paper will give some guidance to engineers and designers, who are devoting themselves to designing space telescopes.<br/></div> © 2021 SPIE

Number of references:6

Main heading:Mirrors

Controlled terms:Plates (structural components)

Uncontrolled terms:Assembling method - Circle support component - Design scheme - Novel structures - Primary reflective mirror - Reflective mirrors - Special structural layout - Structural layout - Structure design - Support plates

Classification code:408.2 Structural Members and Shapes - 741.3 Optical Devices and Systems

Numerical data indexing:Size 6.00E-01m

DOI:10.1117/12.2604296

Database:Compendex

Accession number:20220811682283

Title:Large-range piston error detection technology based on dispersed fringe sensor

Authors:Wang, Pengfei (1, 2); Zhao, Hui (1); Xie, Xiaopeng (1); Zhang, Yating (1, 2); Li, Chuang (1); Fan, Xuewu (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Zhao, Hui(zhaohui@opt.ac.cn)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12070

Part number:1 of 1

Issue title:10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes

Issue date:2021

Publication year:2021

Article number:1207009

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510650152

Document type:Conference article (CA)

Conference name:10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes 2021

Conference date:June 14, 2021 - June 17, 2021

Conference location:Chengdu, China

Conference code:176905

Sponsor:Institute of Optics and Electronics (IOE), Chinese Academy of Sciences; The Chinese Optical Society (COS)

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">Synthetic aperture is the mainstream structure of current astronomical telescopes. However, after the synthetic aperture telescope is deployed in orbit, there will remain tilt and piston error between adjacent segments, which will sharply deteriorate the imaging quality of the optical system. The traditional piston error detection method based on dispersed fringe sensor has the question that it is difficult to detect the piston error within one wavelength, and the detection accuracy is restricted by the detection range. The method in this paper constructs multiple monochromatic light channels by opening windows in different areas on the dispersed fringe pattern, calculating and obtaining the feature value in each window to form a feature vector. Then, the convolutional neural network is introduced to distinguish the feature vector to detect piston error. Among them, the training set construction method adopted in this paper only needs raw data in one wavelength to construct a training set covering the entire detection range. Through simulation, the method proposed in this paper achieves the detection range of [-208λ, 208λ] (λ=720nm), and regardless of the presence of noise, the root mean square value of the detection error does not exceed 17.7nm (0.027λ<inf>min</inf>, λ<inf>min</inf>=660nm).<br/></div> © 2021 SPIE

Number of references:11

Main heading:Synthetic apertures

Controlled terms:Optical systems - Error detection - Convolutional neural networks - Pistons

Uncontrolled terms:'current - Astronomical observation - Co-phasing - Detection range - Detection technology - Dispersed fringe sensor - Features vector - Piston errors - Technology-based - Training sets

Classification code:612.1.1 Internal Combustion Engine Components - 716.2 Radar Systems and Equipment - 741.3 Optical Devices and Systems

Numerical data indexing:Size 1.77E-08m, Size 6.60E-07m, Size 7.20E-07m

DOI:10.1117/12.2604553

Funding details: Number: GFZX04014307, Acronym: -, Sponsor: Higher Education Discipline Innovation Project;

Funding text:Major Project of High-resolution Earth Observation System of China (No. GFZX04014307).

Database:Compendex

Accession number:20214711193946

Title:Calibration Method for Structural Parameters and Assembly Error of Light Field Camera

Title of translation:光场相机结构参数及装配误差标定方法

Authors:Yuan, Suochao (1, 2); Li, Ming (1, 2); Da, Zhengshang (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding authors:Li, Ming(liming1@opt.ac.cn); Li, Ming(liming1@opt.ac.cn); Da, Zhengshang(dazhengshang@opt.ac.cn)

Source title:Zhongguo Jiguang/Chinese Journal of Lasers

Abbreviated source title:Zhongguo Jiguang

Volume:48

Issue:20

Issue date:October 25, 2021

Publication year:2021

Article number:2004001

Language:Chinese

ISSN:02587025

CODEN:ZHJIDO

Document type:Journal article (JA)

Publisher:Science Press

Abstract:<div data-language="eng" data-ev-field="abstract">Objective: A light field camera that is capable of capturing four-dimensional light field information through a single shot can be realized by inserting a microlens array in front of the sensor of a traditional camera. It has great potential to play important roles in many applications such as 3D measurement, flow field velocimetry, and wavefront sensing. To obtain the image information, the captured light-field information shall be decoded. The decoding process is largely based on the structural parameters of the light field camera, including the distance between the microlens array and sensor and the pitch of the microlens array. Because of the errors introduced during the manufacturing and assembling processes, using the nominal values of these parameters are not recommended; calibration of the true values and assembly errors are desired. Several studies have been conducted on the calibration of light field cameras. However, most of these studies follow the framework of the calibration method used for traditional cameras, where a complicated imaging model is built and the unknown parameters are searched using an optimization algorithm. The complexity of procedures in such methods makes them difficult to implement. Based on optical test principles, a new calibration method using simpler calibration models is proposed, which enables fast calibration. Methods: The proposed calibration method comprises two parts: calibration with the main lens and calibration without the main lens. The calibrations of structural parameters are accomplished when the main lens is mounted, and the calibration model is based on the relation that the exit pupil of the main lens is imaged by the microlens. A uniform light source is used to illuminate the pupil of the main lens to obtain calibration images. The distance between the microlens array and sensor and the pitch of the microlens array are treated as two optimized variables of an optimization model and are calculated by searching the optimal values. The calibration of assembly errors is accomplished when the main lens is removed, and the calibration model is based on the imaging feature of the microlens for object points at infinity. A collimated beam is used to illuminate the microlens array to obtain calibration images. Rotation and tilt errors are obtained by analyzing the geometry of the spot array in calibration images. Results and Discussions A self-constructed light field camera is calibrated using the proposed method. The distance between the microlens array and sensor, for which the nominal value is 2.1300 mm, is calibrated to be 2.2738 mm. The pitch of the microlens array, for which the nominal value is 0.3000 mm, is calibrated to be 0.3001 mm. Furthermore, the distance between the microlens array and exit pupil of the main lens is calculated to be 47.7058 mm (Table 1). The rotation error between the microlens array and sensor is calibrated to be 0.1785°, which shall be corrected according to formula (2), and the pitch of microlens array is calculated to be 0.3001 mm by extracting the distance between adjacent spot centroids on the calibration image. The tilt error between the microlens array and sensor is 0.0083° and 0.0047° along the row and column directions of the sensor, respectively, and the distance between the microlens array and sensor is calculated to be 2.2719 mm based on equation (11). The relative deviation of the calibration values of the distance between the microlens array and sensor obtained from the two different methods is 0.84%. Based on the calibration data, reconstruction of the light field is executed and the rotation error is corrected. Compared with the reconstructed images before calibration, the quality of reconstructed images after calibration improved (Fig.10). Conclusions: To solve the problem of calibration of structural parameters and assembly errors of light field cameras, a calibration method based on optical test principles is proposed. A uniform light source is used to illuminate the optical pupil of the main lens, and the array of images of the optical pupil on the sensor is used for calculating the structural parameters, including the pitch of the microlens array and the distance between the microlens array and sensor. The assembly errors can be calibrated with the main lens removed and the microlens array illuminated directly by a collimated light beam. The calibration images captured for assembly error calibration can also be used for estimating the structural parameters through simple geometric analysis, which can serve as comparisons for the calibration results obtained from the method with the main lens mounted. Experiment results show that the calibrated and nominal values of structural parameters agree well with each other, indicating that the proposed calibration method is feasible.<br/></div> © 2021, Chinese Lasers Press. All right reserved.

Number of references:20

Main heading:Cameras

Controlled terms:Wavefronts - Microlenses - Decoding - Light sources - Optimization - Optical instrument lenses - Errors - Parameter estimation

Uncontrolled terms:Assembly error - Calibration method - Calibration model - Computational imaging - Light field camera - Light fields - Micro-lens arrays - Nominal values - Structural parameter - Structure parameter

Classification code:723.2 Data Processing and Image Processing - 741.3 Optical Devices and Systems - 742.2 Photographic Equipment - 921.5 Optimization Techniques

Numerical data indexing:Percentage 8.40E-01%, Size 2.13E-03m, Size 2.2719E-03m, Size 2.2738E-03m, Size 3.001E-04m, Size 3.00E-04m, Size 4.77058E-02m

DOI:10.3788/CJL202148.2004001

Database:Compendex

Accession number:20221311844088

Title:Using Landsat-8 imagery and Generative Adversarial Network for Glacial Lakes Mapping in High Mountain Regions

Authors:Zhao, Hang (1, 2); Liu, Xuebin (1, 2); Wang, Shuang (1, 2)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Wang, Shuang(wangshuang@opt.ac.cn)

Source title:Proceedings of 2021 IEEE 2nd International Conference on Information Technology, Big Data and Artificial Intelligence, ICIBA 2021

Abbreviated source title:Proc. IEEE Int. Conf. Inf. Technol., Big Data Artif. Intell., ICIBA

Part number:1 of 1

Issue title:Proceedings of 2021 IEEE 2nd International Conference on Information Technology, Big Data and Artificial Intelligence, ICIBA 2021

Issue date:2021

Publication year:2021

Pages:877-881

Language:English

ISBN-13:9781665428767

Document type:Conference article (CA)

Conference name:2nd IEEE International Conference on Information Technology, Big Data and Artificial Intelligence, ICIBA 2021

Conference date:December 17, 2021 - December 19, 2021

Conference location:Chongqing, China

Conference code:176951

Sponsor:Chengdu Union Institute of Science and Technology; Chongqing Geeks Education Technology Co., Ltd; Chongqing Global Union Academy of Science and Technology; Chongqing University of Technology; Global Union Academy of Science and Technology; IEEE Beijing Section

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">As an essential resource in High Mountain Regions (HMR), evaluating the glacial lake dynamics is of great significance to explore the impacts of climate changes and predict the risks of Glacial Lake Outburst Floods (GLOFs). However, complicated and laborious methods for glacial lake mapping are unpractically applied in automatically monitoring glacial lakes at a large-scale region. In this work, we explored the mapping efficiency of glacial lakes by combing Generative Adversarial Networks and multi-level feature pyramid (GANMFP) in HMR. We first sampled the image patches containing glacial lakes from Landsat-8 raw data to evaluate the model performance. Totally, 6583 patches with 256x256x7 pixels are randomly cropped from 62 Landsat-8 images. Then we employed these data to train and test the GAN model, which integrated a multi-level feature fusion module in generator and a Resnet-152 networks in discriminator. From the validation results and result visualization, our method achieved good performances in Precision (88.42), Recall (59.61), and Overall Accuracy (99.28), which shows excellent potential in glacial lake mapping at a large-scale region.<br/></div> © 2021 IEEE.

Number of references:14

Main heading:Landsat

Controlled terms:Glacial geology - Computer vision - Mapping - Generative adversarial networks - Climate change - Lakes - Landforms

Uncontrolled terms:Glacial lake outburst flood - Glacial lakes - High mountain region - High mountains - Lake dynamics - LANDSAT - Landsat-8 OLI - Large-scales - Mountain regions - Multilevels

Classification code:405.3 Surveying - 443.1 Atmospheric Properties - 481.1 Geology - 655.2 Satellites - 723.4 Artificial Intelligence - 723.5 Computer Applications - 741.2 Vision

DOI:10.1109/ICIBA52610.2021.9687901

Funding details: Number: 2018YFB0504900, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Funding text:ACKNOWLEDGMENT This work was supported by the National Key R&D Program of China under Grant No.2018YFB0504900.

Database:Compendex

Accession number:20212810613327

Title:Unsupervised Feature Selection using Pseudo Label Approximation (Open Access)

Authors:Deng, Ren (1); Liu, Ye (1); Luo, Liyan (1); Chen, DongJing (1); Li, Xijie (2)

Author affiliation:(1) Amazingx Academy, China; (2) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xian, China

Source title:ACM International Conference Proceeding Series

Abbreviated source title:ACM Int. Conf. Proc. Ser.

Part number:1 of 1

Issue title:2021 13th International Conference on Machine Learning and Computing, ICMLC 2021

Issue date:February 26, 2021

Publication year:2021

Pages:498-502

Article number:3457758

Language:English

ISBN-13:9781450389310

Document type:Conference article (CA)

Conference name:2021 13th International Conference on Machine Learning and Computing, ICMLC 2021

Conference date:February 26, 2021 - March 1, 2021

Conference location:Virtual, Online, China

Conference code:169701

Publisher:Association for Computing Machinery

Abstract:<div data-language="eng" data-ev-field="abstract">Feature selection is a machine learning technique that selects a representative subset of all features available in order to reduce the time and space needed to process high-dimensional data. Traditional feature selection methods include filter, wrapper, and embedded approaches. However, many conventional methods' performances are not suitable in many contexts. This paper proposes a new unsupervised feature selection model based on pseudo label approximation. The new derived model incorporates a projection error, a sparsity regularization, and a manifold regularization term that preserves the manifold structure of the original data. Finally, implementation of the new model onto five distinct datasets validates the effectiveness of the proposed model.<br/></div> © 2021 ACM.

Number of references:14

Main heading:Feature Selection

Controlled terms:Clustering algorithms - Learning systems

Uncontrolled terms:Conventional methods - Feature selection methods - High dimensional data - Machine learning techniques - Manifold regularizations - Manifold structures - Sparsity regularizations - Unsupervised feature selection

Classification code:903.1 Information Sources and Analysis

DOI:10.1145/3457682.3457758

Database:Compendex

Open Access type(s): All Open Access, Bronze

Accession number:20214111012762

Title:Design of visible-near infrared athermal continuous zoom optical system

Title of translation:可见-近红外无热化连续变焦光学系统设计

Authors:Qu, Rui (1, 2); Guo, Huinan (1); Cao, Jianzhong (1); Yang, Jianfeng (1)

Author affiliation:(1) Xi'an Institute of Optical and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) Univisity of Chinese Academy of Sciences, Beijing; 100049, China

Source title:Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering

Abbreviated source title:Hongwai yu Jiguang Gongcheng Infrared Laser Eng.

Volume:50

Issue:9

Issue date:September 25, 2021

Publication year:2021

Article number:20210090

Language:Chinese

ISSN:10072276

Document type:Journal article (JA)

Publisher:Chinese Society of Astronautics

Abstract:<div data-language="eng" data-ev-field="abstract">The primary aberration of each lens group will be changed with their movement, and the change of environment temperature will also lead to defocus, both of which will cause a lot of difficulties in the zoom lens design process. To solve this problem, aberration functions do depend and not depend on group movement were introduced based on optical aberration theory, and lens power distribution and material selection method were discussed with the achromatic and athermal design model futher. A visible-near infrared (Vis-Nir) optical system under the requirements of F/5, focal length of 8-120 mm, focal plane diameter of 6.2 mm, work waveband of 0.48-0.68 μm and 0.7-0.9 μm was designed with mechanically compensated method and optical passive athermal technology. The proposed zoom lens system, which used 7 kinds of common optical glass, consists of 12 groups 16 lenses, total length of only 90 mm, has good image quality and tolerance character among the zoom range within −40~60 ℃.<br/></div> © 2021, Editorial Board of Journal of Infrared and Laser Engineering. All right reserved.

Number of references:15

Main heading:Aberrations

Controlled terms:Optical design - Optical glass - Group theory - Infrared devices - Optical systems

Uncontrolled terms:Athermal - Change of environment - Continuous zooms - Dehazing - Optical dehazing - Optical- - Primary aberration - Visible near-infrared - Wide-band - Zoom optical system

Classification code:741.1 Light/Optics - 741.3 Optical Devices and Systems - 812.3 Glass - 921.1 Algebra - 921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory

Numerical data indexing:Size 4.80E-07m to 6.80E-07m, Size 6.20E-03m, Size 7.00E-07m to 9.00E-07m, Size 8.00E-03m to 1.20E-01m, Size 9.00E-02m

DOI:10.3788/IRLA20210090

Database:Compendex

Accession number:20210109710833

Title:Pixel-wise ordinal classification for salient object grading

Authors:Liu, Yanzhu (1); Wang, Yanan (2); Kong, Adams Wai Kin (1)

Author affiliation:(1) School of Computer Science and Engineering, Nanyang Technological University, 639978, Singapore; (2) Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China

Corresponding author:Liu, Yanzhu(yzliu@ntu.edu.sg)

Source title:Image and Vision Computing

Abbreviated source title:Image Vision Comput

Volume:106

Issue date:February 2021

Publication year:2021

Article number:104086

Language:English

ISSN:02628856

CODEN:IVCODK

Document type:Journal article (JA)

Publisher:Elsevier Ltd

Abstract:Driven by business intelligence applications for rating attraction of products in shops, a new problem — salient object grading is studied in this paper. In computer vision, plenty of salient object detection approaches have been proposed, while most existing studies detect objects in a binary manner: salient or not. This paper focuses on a new problem setting that requires detecting all salient objects and categorizing them into different salient levels. Based on that, a pixel-wise ordinal classification method is proposed. It consists of a multi-resolution saliency detector which detects and segments objects, an ordinal classifier which grades pixels into different salient levels, and a binary saliency enhancer which sharpens the difference between non-saliency and all other salient levels. Two new image datasets with salient level labels are constructed. Experimental results demonstrate that, on the one hand, the proposed method provides effective salient level predictions and on the other hand, offers very comparable performance with state-of-the-art salient object detection methods in the traditional problem setting.<br/> © 2020 Elsevier B.V.

Number of references:23

Main heading:Deep neural networks

Controlled terms:Object recognition - Pixels - Grading - Object detection

Uncontrolled terms:Business intelligence applications - Image datasets - Ordinal classification - Salient object detection - Salient objects - State of the art

Classification code:461.4 Ergonomics and Human Factors Engineering - 723.2 Data Processing and Image Processing

DOI:10.1016/j.imavis.2020.104086

Funding details: Number: MOE2016-T2-1-042, Acronym: MOE, Sponsor: Ministry of Education - Singapore;

Funding text:This work is supported by Ministry of Education , Singapore ( MOE2016-T2-1-042 (S)).

Database:Compendex

Accession number:20220211449112

Title:Tilt error correction of minitype theodolite's vertical shaft based on angular contact ball bearings

Title of translation:基于角接触球轴承的小型经纬仪方位轴倾斜误差修正

Authors:Li, Xiangyu (1, 2); Peng, Bo (1, 2); Jiang, Bo (1); Ruan, Ping (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Source title:Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering

Abbreviated source title:Hongwai yu Jiguang Gongcheng Infrared Laser Eng.

Volume:50

Issue:12

Issue date:December 25, 2021

Publication year:2021

Article number:20210172

Language:Chinese

ISSN:10072276

Document type:Journal article (JA)

Publisher:Chinese Society of Astronautics

Abstract:<div data-language="eng" data-ev-field="abstract">The design of minitype theodolite's vertical shaft which based on angular contact ball bearings usually refer to similar model for estimation and analogy. This method can effectively improve the design efficiency as well as endowing the vertical shaft a better engineering practicability. However, these experience-based designs hardly reach the best options, hence leaves room for optimizing and improvements. The vertical shaft of a small theodolite was studied from tilt error correction. The shaft optimization parameters were determined based on the physical model. Then the design parameters of bearing outer end ring were optimized by using finite element analysis. At the same time, the selection of bearing fit clearance's design parameter values were analyzed through tilt error theoretical modeling. Meanwhile, the biaxial perpendicularity errors of this small theodolite with and without optimizing were both detected after partial load hoisting. The result shows that the biaxial perpendicularity error of optimized theodolite is lower with an approximate value of 6", compared unoptimized theodolite with an approximate value of 20". Tilt error of the rear vertical shaft is less than that before optimizing. The rationality and effectiveness of this optimization method mentioned are verified.<br/></div> Copyright ©2021 Infrared and Laser Engineering. All rights reserved.

Number of references:10

Main heading:Finite element method

Controlled terms:Error correction

Uncontrolled terms:Axis error - Design efficiency - Errors correction - Finite element analyse - Optimization parameter - Photoelectric theodolite - Physical modelling - Similar models - Tilt errors - Vertical shaft

Classification code:921.6 Numerical Methods

DOI:10.3788/IRLA20210172

Database:Compendex

Accession number:20220811674420

Title:Investigation of wheel polishing technology based on industrial robot

Authors:Yao, Yongsheng (1, 2); Li, Qixin (1, 2); Shen, Le (1); DIng, Jiaoteng (1, 2); Ma, Zhen (1); Fan, Xuewu (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12071

Part number:1 of 1

Issue title:10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing and Metrology Technologies

Issue date:2021

Publication year:2021

Article number:120710L

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510650176

Document type:Conference article (CA)

Conference name:10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing and Metrology Technologies 2021

Conference date:June 14, 2021 - June 17, 2021

Conference location:Chengdu, China

Conference code:176906

Sponsor:Institute of Optics and Electronics (IOE), Chinese Academy of Sciences; The Chinese Optical Society (COS)

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">In this paper, industrial robot is used as motion carrier and self-developed flexible wheel tool is used as polishing tool to realize low-cost, high-efficiency, and high-precision optical processing. Firstly, the mapping formula between the workpiece coordinates and the road point coordinates is deduced, and the position and posture data required for robot programming are obtained. Secondly, a new type of wheel polishing tool is designed, which controls the polishing pressure through a pneumatic floating structure to ensure the stability of the removal function. Finally, an off-axis paraboloid of φ345mm was processed using this technology. After three times of processing for 10 hours, the surface error converged from PV-2.111λ, RMS-0.249λ to PV-0.119λ, RMS-0.01λ. PV and RMS converged by 94% and 96%, respectively. This proves that the technology has the advantages of high efficiency and high precision, and is expected to be widely used in the field of precision optical processing.<br/></div> © COPYRIGHT SPIE.

Number of references:17

Main heading:Polishing

Controlled terms:Wheels - Costs - Efficiency - Robot programming - Industrial robots

Uncontrolled terms:High-precision - Higher efficiency - Low-costs - Off-axis aspheric surfaces - Optical processing - Polishing technology - Polishing tool - Technology-based - Wheel polishing - Workpiece

Classification code:601.2 Machine Components - 604.2 Machining Operations - 723.1 Computer Programming - 731.5 Robotics - 731.6 Robot Applications - 911 Cost and Value Engineering; Industrial Economics - 913.1 Production Engineering

Numerical data indexing:Percentage 9.40E+01%, Percentage 9.60E+01%, Time 3.60E+04s

DOI:10.1117/12.2605412

Funding details: Number: 2020GY-157, Acronym: -, Sponsor: -;

Funding text:This work is supported by the Shaanxi Province Key R&D Program (2020GY-157) and Youth Innovation Promotion

Database:Compendex

Accession number:20215211375318

Title:Design of special cylinder support for reflective mirror in space optical instrument for laser communication

Authors:Song, Yang (1); Chai, Wenyi (1); Shen, Zhong (1); Ye, Jing (1, 2); Ma, Tengfei (1); Hu, Yongming (1)

Author affiliation:(1) Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Ye, Jing(yejing@opt.ac.cn)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12057

Part number:1 of 1

Issue title:Twelfth International Conference on Information Optics and Photonics, CIOP 2021

Issue date:2021

Publication year:2021

Article number:120570T

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510649897

Document type:Conference article (CA)

Conference name:12th International Conference on Information Optics and Photonics, CIOP 2021

Conference date:July 23, 2021 - July 26, 2021

Conference location:Xi'an, China

Conference code:175384

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">The number of space optical instruments is growing with a quick pace. Reflective mirror is always a significant part in a space optical system, especially in the laser communication system. Support is used to connect reflective mirror to other structure. The paper focused on designing a cylinder support. Considering thermal condition in space, the paper gave a special design of support with some soft links. The paper made a comparison between traditional design scheme of cylinder support and new design scheme of special cylinder support. From the comparison, it could be concluded that new design scheme had better performance in the thermal condition. Later, modal analysis and some vibration analyses were done to verify the reliability and feasibility of the new design. The result showed the design scheme was good.<br/></div> © 2021 COPYRIGHT SPIE.

Number of references:6

Main heading:Vibration analysis

Controlled terms:Optical systems - Optical instruments - Optical communication - Reliability analysis - Cylinders (shapes) - Modal analysis

Uncontrolled terms:Design scheme - Laser communication system - Performance - Reflective mirrors - Space optical system - Special cylinder support - Thermal condition - Vibrations analysis

Classification code:717.1 Optical Communication Systems - 741.3 Optical Devices and Systems - 921 Mathematics - 941.3 Optical Instruments

DOI:10.1117/12.2604298

Database:Compendex

Accession number:20213510838944

Title:Design analysis and test verification of a rigid-flexible, dual-mode coupling support structure for space-based rectangular curved prisms

Authors:Jia, Xin-Yin (1, 2); Wang, Fei-Cheng (1); Li, Li-Bo (1); Zhang, Zhao-Hui (1); Liu, Jia (1); Hu, Bing-Liang (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Hu, Bing-Liang(hbl@opt.ac.cn)

Source title:Applied Optics

Abbreviated source title:Appl. Opt.

Volume:60

Issue:25

Issue date:September 1, 2021

Publication year:2021

Pages:7563-7573

Language:English

ISSN:1559128X

E-ISSN:21553165

CODEN:APOPAI

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">In view of the functional requirements of high reliability and stability support of optical components of space remote sensors, a rigid-flexible, dual-mode coupling support structure for space-based rectangular curved prisms (SRCPs) was designed. In-depth studies of the support principle and engineering realization of theSRCPs and optimization of the flexible adhesive structure were performed. Static and dynamic simulations were conducted on the mirror subassembly by means of finite element analysis, and test verification was also performed. The tests revealed that the surface shape error of the mirror subassembly after mechanical testing was 0.021λ, the displacement of the mirror body was 0.008 mm, the inclination angle was&sim;0.8'', the mass of the mirror subassembly was 4.79 kg, the fundamental frequency was 283 Hz, and the maximum amplification of the total rms acceleration was 4.37. All indexes were superior to those of the design requirements. On this basis, bonding tests and mechanical tests of a rectangular curved prism reflector, a rectangular curved prism, and a rectangular plane reflector employing this proposed support structure were continued. The test results verified the reliability, stability, and universal applicability of the proposed rigid-flexible, dual-mode peripheral bonding support structure.<br/></div> © 2021 Optical Society of America.

Number of references:19

Main heading:Mirrors

Controlled terms:Mechanical testing - Ground supports - Adhesives - Reflection - Rigid structures - Prisms - Optical remote sensing

Uncontrolled terms:Engineering realizations - Functional requirement - Fundamental frequencies - Inclination angles - Optical components - Space remote sensors - Support structures - Surface shape error

Classification code:408 Structural Design - 741.3 Optical Devices and Systems - 943.2 Mechanical Variables Measurements

Numerical data indexing:Frequency 2.83e+02Hz, Mass 4.79e+00kg, Size 8.00e-06m

DOI:10.1364/AO.431394

Funding details: Number: 41706207, Acronym: NNSFC, Sponsor: National Natural Science Foundation of China;Number: 2019JQ-929, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;

Funding text:Funding. Natural Science Foundation of Shaanxi Province (2019JQ-929); National Natural Science Foundation of China (41706207).

Database:Compendex

Accession number:20214111005981

Title:Effect of pupil matching of cold shield on the fringe contrast of long-wave infrared spatial heterodyne spectroscopy

Authors:Han, Bin (1, 2); Feng, Yutao (1); Zhang, Zhaohui (1); Wu, Junqiang (1); Wu, Yang (1, 2); Sun, Jian (1); Wang, Pengchong (1); Chang, Chenguang (1); Li, Juan (1); Zhao, Yudi (1); Hu, Bingliang (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Feng, Yutao(fytciom@126.com)

Source title:Applied Optics

Abbreviated source title:Appl. Opt.

Volume:60

Issue:29

Issue date:October 10, 2021

Publication year:2021

Pages:9241-9248

Language:English

ISSN:1559128X

E-ISSN:21553165

CODEN:APOPAI

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">Matching the cold shield with the exit pupil of the fringe-imaging system of long-wave infrared (LWIR) spatial heterodyne spectroscopy (SHS) damages illumination uniformity of the interferogram and affects the fringe contrast, which is a significant parameter for LWIR SHS. The optical models of the fringe-imaging system considering and not considering the pupil matching of the cold shield are built to illustrate the effect on the fringe contrast. Simulations based on the optical design software ASAP are conducted to verify the fringe contrast loss for field-widened LWIR SHS. The result shows that the pupil matching of the cold shield decreases the fringe contrast of LWIR SHS and field-widened LWIR SHS by 0.049% and 0.053%, respectively, and the fringe contrast loss increases with the degree of deviation from the telecentric condition of the fringe-imaging system.<br/></div> © 2021 Optical Society of America.

Number of references:20

Main heading:Imaging systems

Controlled terms:Infrared radiation - Optical heterodyning - Infrared devices - Optical design

Uncontrolled terms:Cold shield - Contrast loss - Exit pupil - Fringe contrasts - Illumination uniformity - Interferograms - Matchings - Optical modelling - Optical-design software - Spatial heterodyne spectroscopies

Classification code:741.1 Light/Optics - 746 Imaging Techniques

Numerical data indexing:Percentage 4.90E-02%, Percentage 5.30E-02%

DOI:10.1364/AO.439482

Funding details: Number: 41005019, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: XAB 2016A07, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: -, Acronym: -, Sponsor: West Light Foundation of the Chinese Academy of Sciences;Number: 2019JQ-931,E1294301, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;

Funding text:Funding. National Natural Science Foundation of China (41005019); West Light Foundation of the Chinese Academy of Sciences (XAB 2016A07); Natural Science Basic Research Program of Shaanxi Province (2019JQ-931); West Light Cross-Disciplinary Innovation team of Chinese Academy of Sciences (E1294301).

Database:Compendex

Accession number:20214511111286

Title:Surface response correction method of light intensity detector in high energy laser measurement

Title of translation:高能激光测量中的光强探测器面响应校正方法

Authors:Xue, Fang (1, 2); Chen, Yongquan (1); Duan, Yaxuan (1); Lin, Hui (1); Da, Zhengshang (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Source title:Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering

Abbreviated source title:Hongwai yu Jiguang Gongcheng Infrared Laser Eng.

Volume:50

Issue date:October 25, 2021

Publication year:2021

Article number:20210215

Language:Chinese

ISSN:10072276

Document type:Journal article (JA)

Publisher:Chinese Society of Astronautics

Abstract:<div data-language="eng" data-ev-field="abstract">In order to reduce the influence of the non-uniformity of the surface response of the intensity detector on the near field parameter measurement for the high-energy laser inertial confinement fusion device (ICF), a correction method for the non-uniformity of the light-intensity detector surface response in the near-field parameter measurement of the high-energy laser was proposed. Theoretically, a multi-point calibration linear correction model based on the high-energy laser near-field spatial evaluation factor was deduced, and a non-uniformity automatic correction device on surface response for high-uniformity linear output light intensity detector was designed and built. In order to verify the effectiveness of the proposed method, the surface response non-uniformity of a certain type of scientific-grade CCD was corrected. The surface response modulation degree of the detector was reduced from 1.42 to 1.08, and the contrast was reduced from 0.014 to 0.004. Compared with the two-point calibration method, the uniformity of the light intensity detector after correction using the proposed method in this article was greatly improved. The results show that this method can provide an effective technical means for the correction of the uniformity of the surface response of the light intensity detector in the parameter measurement of the high-energy laser ICF device in my country.<br/></div> © 2021, Editorial Board of Journal of Infrared and Laser Engineering. All right reserved.

Number of references:16

Main heading:Modulation

Controlled terms:Calibration - Parameter estimation - High energy lasers - Inertial confinement fusion

Uncontrolled terms:Contrast - Correction method - High-energy lasers - Light intensity - Modulation degrees - Near fields - Non-uniformity of surface response - Nonuniformity - Parameter measurement - Surface response

Classification code:744.1 Lasers, General - 932.2.1 Fission and Fusion Reactions

DOI:10.3788/IRLA20210215

Database:Compendex

Accession number:20213110716910

Title:Design of underwater large field of view zoom optical system

Title of translation:水下大视场连续变焦光学系统设计

Authors:Qu, Rui (1, 2); Yang, Jianfeng (1); Cao, Jianzhong (1); Liu, Bo (1)

Author affiliation:(1) Xi'an Institute of Optical and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) Univisity of Chinese Academy of Sciences, Beijing; 100049, China

Source title:Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering

Abbreviated source title:Hongwai yu Jiguang Gongcheng Infrared Laser Eng.

Volume:50

Issue:7

Issue date:July 25, 2021

Publication year:2021

Article number:20200468

Language:Chinese

ISSN:10072276

Document type:Journal article (JA)

Publisher:Chinese Society of Astronautics

Abstract:<div data-language="eng" data-ev-field="abstract">Under the requirements of an underwater large field of view zoom optical system, the selection of optical window and its influence on objective lens were discussed, by which the relative distortion and lateral color induced by the plane window were analyzed and corresponding design methods were given. Regarding the special envelope and working distance requirements of the underwater optical system, a three-part zoom system design model and the design method of the corresponding focusing components were provided by introducing aberration stabilizers in the PNNP structure, dynamic aberration correction capability of the optical structure was improved, also, the problems of the cam curve breakpoints were avoided; by setting the focus lens group in the objective parts, close-range imaging through the entire zoom range was guaranteed. A 4 K underwater large field of view zoom optical system was completed using 3840×2160 high-sensitivity CMOS detector, with 0.5 m-inf working distance, 0.48−0.64 μm work waveband, constant F number of up to 2.8 and 5.9°−62° full field of view. The image quality and tolerance characters are validated by an assembled lens and its underwater imaging experiments.<br/></div> Copyright ©2021 Infrared and Laser Engineering. All rights reserved.

Number of references:31

Main heading:Optical design

Controlled terms:Systems analysis - Optical systems - Aberrations - Optical instrument lenses - Underwater imaging - Structural design

Uncontrolled terms:Dynamic aberrations - High sensitivity - Imaging experiments - Large field of views - Optical structures - Relative distortion - Working distances - Zoom optical system

Classification code:408.1 Structural Design, General - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 746 Imaging Techniques - 912.3 Operations Research - 961 Systems Science

Numerical data indexing:Temperature 4.00e+00K

DOI:10.3788/IRLA20200468

Database:Compendex

Accession number:20213110705823

Title:Adaptive Weighted Exposure Algorithm Based on Region Luminance Detection

Authors:Yang, Lei (1, 2); Zhang, Derui (1, 2); Cao, Jianzhong (1, 2); Zhang, Hui (1, 2); Wang, Hua (1, 2); Bian, He (2); Wang, Huawei (2)

Author affiliation:(1) University of Chinese Academy of Sciences, Beijing; 100049, China; (2) Xi'an Institute of Optics and Precision Mechanics Chinese, Academy of Sciences, Xi'an; 710119, China

Source title:2021 IEEE 3rd International Conference on Communications, Information System and Computer Engineering, CISCE 2021

Abbreviated source title:IEEE Int. Conf. Commun., Inf. Syst. Comput. Eng., CISCE

Part number:1 of 1

Issue title:2021 IEEE 3rd International Conference on Communications, Information System and Computer Engineering, CISCE 2021

Issue date:May 14, 2021

Publication year:2021

Pages:539-542

Article number:9445988

Language:English

ISBN-13:9780738112152

Document type:Conference article (CA)

Conference name:3rd IEEE International Conference on Communications, Information System and Computer Engineering, CISCE 2021

Conference date:May 14, 2021 - May 16, 2021

Conference location:Beijing, China

Conference code:170477

Sponsor:IEEE

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">When the traditional global auto-exposure algorithm is applied to high contrast special scenes such as dark background and bright target, there is often over-exposure of the target, which leads to the loss of the key information of the subject concerned. To solve this problem, an adaptive weight exposure method based on regional brightness detection is proposed. Firstly, the whole imaging field of view is divided into several regions, and then the position of the target in the field of view is identified by independent judgment. Finally, the automatic exposure control of gray statistics is carried out according to the preset region weight. The experimental results show that the proposed method can effectively improve the image quality of the bright target or dark target in the dark background, avoid the phenomenon of the target too bright or too dark, and better capture the texture features of the target.<br/></div> © 2021 IEEE.

Number of references:7

Main heading:Luminance

Controlled terms:Image enhancement - Textures

Uncontrolled terms:Adaptive weights - Auto exposure - Field of views - Gray statistics - High contrast - Imaging fields - Texture features

Classification code:903.3 Information Retrieval and Use

DOI:10.1109/CISCE52179.2021.9445988

Database:Compendex

Accession number:20214911288601

Title:Development and prospects of deployable space optical telescope technology

Title of translation:可展开空间光学望远镜技术发展及展望

Authors:Hu, Bin (1, 2); Li, Chuang (1); Xiang, Meng (2); Li, Liangliang (2); Dai, Haobin (2); Yao, Pei (2); Li, Xuyang (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Li, Chuang

Source title:Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering

Abbreviated source title:Hongwai yu Jiguang Gongcheng Infrared Laser Eng.

Volume:50

Issue:11

Issue date:November 25, 2021

Publication year:2021

Article number:20210199

Language:Chinese

ISSN:10072276

Document type:Journal article (JA)

Publisher:Chinese Society of Astronautics

Abstract:<div data-language="eng" data-ev-field="abstract">In order to obtain higher angular resolution, the aperture of the space optical telescope is getting larger and larger, and the space telescope with aperture of more than four meters will be difficult to break through the limitation of the effective envelope of the fairing of the existing launch vehicle. On the other hand, the micro-nano optical remote sensing satellite, which has great advantages in terms of development cycle and cost, also has extensive requirements for improving spatial resolution and light gathering area, requiring a smaller launch volume to accommodate a large opto-mechanical system to reduce the launch cost. Deployable space telescopes will be a feasible solution to overcome the limitations of launch size. The research status of deployable space telescopes was reviewed from the aspects of large aperture space astronomical telescopes, segmented mirror deployable telescopes for earth observation and micro-nano satellite optical telescopes deploying along optical axis. Some key technologies and development trends involved in deployable space telescopes were described and summarized.<br/></div> © 2021, Editorial Board of Journal of Infrared and Laser Engineering. All right reserved.

Number of references:86

Main heading:Optical remote sensing

Controlled terms:Optomechanics - Earth (planet) - Mirrors - Space telescopes

Uncontrolled terms:Deployable mechanisms - Development costs - High angular resolutions - High resolution - Large aperture - Micro/nano - Optical remote sensing - Optical telescope technology - Remote sensing satellites - Segmented primary mirrors

Classification code:741.3 Optical Devices and Systems - 961 Systems Science

DOI:10.3788/IRLA20210199

Database:Compendex

Accession number:20213910941992

Title:Hyperspectral Abnormal Target Detection Based on Extended Multi-attribute Profile and Fast Local RX Algorithm

Title of translation:结合扩展多属性剖面与快速局部RX算法的高光谱异常目标检测

Authors:A, Ruhan (1); Yuan, Xiaobin (2); Mu, Xiaodong (1); Wang, Jingyi (3)

Author affiliation:(1) College of Operational Support, Rocket Force University of Engineering, Xi'an; 710025, China; (2) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) School of Computer Science, Xi'an Shiyou University, Xi'an; 710065, China

Corresponding author:Mu, Xiaodong(Mu_403@163.com)

Source title:Guangzi Xuebao/Acta Photonica Sinica

Abbreviated source title:Guangzi Xuebao

Volume:50

Issue:9

Issue date:September 25, 2021

Publication year:2021

Pages:289-299

Language:Chinese

ISSN:10044213

CODEN:GUXUED

Document type:Journal article (JA)

Publisher:Chinese Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">In order to further improve the speed and accuracy of hyperspectral abnormal target detection, a fast anomaly target detection method based on extended multi-attribute profiles and improved Reed-Xiaoli is proposed. Extended multi-attribute Profiles are extracted from the original hyperspectral images by mathematical morphological transformations. Moreover, a novel fast local Reed-Xiao algorithm is also proposed. Iteratively update inverse matrix of covariance using matrix inverse lemma, thereby reducing the computational complexity of the Mahalanobis distance. The combination of extended multi-attribute profiles and fast local Reed-Xiaoli detector effectively utilizes the spectral information and spatial information of hyperspectral images, it greatly improves the detection accuracy and reduce the running time. Experimental results on three real data sets show the AUC value of the algorithm in this paper is 0.996 7, 0.985 6 and 0.981 6 respectively. The operation time is 21.218 1 s, 15.192 8 s and 32.337 9 s respectively. The proposed method has obvious advantages in detection accuracy and speed, and has good practical value.<br/></div> © 2021, Science Press. All right reserved.

Number of references:22

Main heading:Anomaly detection

Controlled terms:Inverse problems - Spectroscopy - Covariance matrix - Iterative methods - Mathematical transformations - Image enhancement - Mathematical morphology

Uncontrolled terms:Abnormal target detections - Anomaly detection - Detection accuracy - Extended multi-attribute profile - Fast local RX - HyperSpectral - Matrix inverse - Matrix inverse lemma - Multi-attributes - Reed-xiaoli

Classification code:921 Mathematics - 921.3 Mathematical Transformations - 921.6 Numerical Methods

Numerical data indexing:Time 1.00E00s, Time 8.00E+00s, Time 9.00E+00s

DOI:10.3788/gzxb20215009.0910002

Funding details: Number: 41301480,62002286, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:item：National Natural Science Foundation of China（Nos.41301480，62002286）

Database:Compendex

Accession number:20215011322023

Title:A Pose Measurement Algorithm of Space Target Based on Monocular Vision and Accuracy Analysis

Title of translation:一种基于单目视觉的空间目标位姿测量算法及其精度定量分析

Authors:Dong, Yongying (1); Zhang, Gaopeng (2); Chang, Sansan (2); Zhang, Zhi (2); Li, Yanjie (3)

Author affiliation:(1) School of Electronic Engineering, Xi'an University of Posts and Telecommunications, Xi'an; 710121, China; (2) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) School of Mechatronic Engineering, Xi'an Technological University, Xi'an; 710021, China

Corresponding author:Zhang, Gaopeng(zhanggaopeng@opt.ac.cn)

Source title:Guangzi Xuebao/Acta Photonica Sinica

Abbreviated source title:Guangzi Xuebao

Volume:50

Issue:11

Issue date:November 25, 2021

Publication year:2021

Article number:1112003

Language:English

ISSN:10044213

CODEN:GUXUED

Document type:Journal article (JA)

Publisher:Chinese Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">Aiming at the low efficiency of traditional orthogonal iterative algorithm, an improved orthogonal iterative algorithm is proposed to measure the pose of space objects based on monocular vision. Firstly, based on the traditional orthogonal iterative algorithm, the translation vector in the iterative process was eliminated. The initial value of the rotation matrix was solved by using the parallel perspective model instead of the weak perspective projection model, so as to accelerate the solution process of the orthogonal iterative algorithm. Secondly, simulation experiments are used to study the effects of the extraction accuracy of the imaging point, the accuracy of three-dimensional coordinate of the space feature point, the calibration accuracy of the camera principal point, the calibration accuracy of the camera focal length and the number of space feature points on the accuracy and efficiency of the algorithm. Based on the results of the simulation experiments, Taguchi method is used to quantitatively analyze the influence of each factor on the accuracy of the algorithm, and find out the factor that has the greatest influence on the accuracy of the improved orthogonal iteration algorithm. Finally, the performance of the proposed improved orthogonal iteration algorithm is tested by the physical experiments. The physical experiments prove that the proposed method is accurate, and takes shorter run time than that of traditional orthogonal iteration algorithm. Based on the results of the orthogonal experiment, the accuracy of the improved orthogonal iteration algorithm could meet different demand of different space task by controlling the different influence factors.<br/></div> © 2021, Science Press. All right reserved.

Number of references:28

Main heading:Taguchi methods

Controlled terms:Efficiency - Vision - Signal to noise ratio - Iterative methods - Calibration - Cameras

Uncontrolled terms:Calibration accuracy - Improved orthogonal iteration algorithm - Iteration algorithms - Iterative algorithm - Monocular vision - Orthogonal iteration - Physical experiments - Pose measurement - Space targets - Taguchi's methods

Classification code:716.1 Information Theory and Signal Processing - 742.2 Photographic Equipment - 913.1 Production Engineering - 913.3 Quality Assurance and Control - 921.6 Numerical Methods - 922.2 Mathematical Statistics

DOI:10.3788/gzxb20215011.1112003

Funding details: Number: 51905529, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:The National Natural Science Foundation of China (No.51905529)

Database:Compendex

Accession number:20215211385331

Title:Energy Efficiency Analysis in Modified GoF Spectrum Sensing-Based AF Relay Cooperative Cognitive Sensor Network with Energy Harvesting (Open Access)

Authors:Mi, Yin (1, 2); Lu, Guangyue (2); Gao, Wenbin (2)

Author affiliation:(1) Xi'An Institute of Optics and Precision Mechanics of CAS, University of Chinese Academy of Sciences, Xi'an; 710119, China; (2) School of Communications and Information Engineering, Xi'An University of Posts and Telecommunications, Xi'an; 710121, China

Corresponding author:Lu, Guangyue(tonylugy@163.com)

Source title:Security and Communication Networks

Abbreviated source title:Secur. Commun. Networks

Volume:2021

Issue date:2021

Publication year:2021

Article number:3340525

Language:English

ISSN:19390114

E-ISSN:19390122

Document type:Journal article (JA)

Publisher:Hindawi Limited

Abstract:<div data-language="eng" data-ev-field="abstract">In this paper, we propose a joint sensing duration and transmission power allocation scheme to maximize the energy efficiency (EE) of the secondary user (SU) in a cooperative cognitive sensor network (CSN). At the initial time slot of the frame, the secondary transmitter (ST) performs energy harvesting (EH) and spectrum sensing simultaneously using power splitting (PS) protocol. The modified goodness of fit (GoF) spectrum sensing algorithm is employed to detect the licensed spectrum, which is not sensitive to an inaccurate noise power estimate. Based on the imperfect sensing results, the ST will act as an amplify-and-forward (AF) relay and assist in transmission of the primary user (PU) or transmit its own data. The SU's EE maximization problem is constructed under the constraints of meeting energy causality, sensing reliability, and PU's quality of service (QoS) requirement. Since the SU's EE function is a nonconvex problem and difficult to solve, we transform the original problem into a tractable convex one with the aid of Dinkelbach's method and convex optimization technique by applying a nonlinear fractional programming. The closed-form expression of the ST's transmission power is also derived through Karush-Kuhn-Tucker (KKT) and gradient method. Simulation results show that our scheme is superior to the existing schemes.<br/></div> © 2021 Yin Mi et al.

Number of references:29

Main heading:Energy efficiency

Controlled terms:Convex optimization - Quality of service - Gradient methods - Energy harvesting - Sensor networks

Uncontrolled terms:Amplifyand-forward relay - Energy efficiency analysis - Goodness of fit - Initial time - Power splitting - Secondary user - Sensors network - Spectrum sensing - Timeslots - Transmission power allocation

Classification code:525.2 Energy Conservation - 525.5 Energy Conversion Issues - 921.6 Numerical Methods

DOI:10.1155/2021/3340525

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20220211446982

Title:High-power ultraviolet laser at 343 nm based on femtosecond fiber laser system

Authors:Wu, Tianhao (1, 2); Li, Feng (1); Yang, Xiaojun (1)

Author affiliation:(1) Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Shaanxi Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Li, Feng(lifeng@opt.ac.cn)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12060

Part number:1 of 1

Issue title:AOPC 2021: Advanced Laser Technology and Applications

Issue date:2021

Publication year:2021

Article number:120601I

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510649958

Document type:Conference article (CA)

Conference name:2021 Applied Optics and Photonics China: Advanced Laser Technology and Applications, AOPC 2021

Conference date:June 20, 2021 - June 22, 2021

Conference location:Beijing, China

Conference code:175856

Sponsor:Chinese Society for Optical Engineering

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">Femtosecond laser has the characteristics of short pulse width and high peak power and is widely used in laser micromachiningoptical communication, medical applications and other fields. Compared with infrared lasers, ultraviolet lasers have shorter wavelength and higher single-photon energy, which makes the processing heat affected area smaller and can perform precise processing on special materials. With the advancement of science and technology, people are demanding higher precision in laser processing, then ultrashort pulse lasers in the ultraviolet spectrum have gradually came into people's sight. At present, there have been many reports on femtosecond solid-state ultraviolet lasers domestic and overseas. However, solid-state lasers are bulky and difficult to dissipate heat. In contrast, the fiber femtosecond laser has a stable and compact structure and is more suitable for industrial processing. However, it is understood that there are very few domestic studies on femtosecond fiber lasers in the ultraviolet band. In recent years, fiber laser technology has been greatly developed. Femtosecond fiber lasers have good beam quality and high laser directivity, besides it can provide high-power, high-repetition output in the near-infrared spectrum. In this experiment, we propose an ultraviolet femtosecond laser system based on β-BaB2O4 crystal. The fundamental frequency laser passes through two BBO crystals to generate second harmonic generation and third harmonic generation. At the same time, we adjust the angle at which each beam of laser passes through each crystal to meet the conditions of phase matching and obtain the maximum conversion efficiency. It's worth mentioning that the system has a compact structure, low cost, and high conversion efficiency. Besides, it has broad application prospects.<br/></div> © 2021 SPIE.

Number of references:9

Main heading:Ultraviolet lasers

Controlled terms:Optical frequency conversion - Infrared devices - Conversion efficiency - Harmonic analysis - Phase matching - Femtosecond lasers - Fiber lasers - Fibers - Harmonic generation - Particle beams - Medical applications - Optical parametric oscillators

Uncontrolled terms:Compact structures - Femtosecond fiber lasers - Harmonic generation and mixing - High peak power - High power - Infrared-laser - Laser systems - Nonlinear crystals - Short pulse width - Ultraviolet

Classification code:525.5 Energy Conversion Issues - 713 Electronic Circuits - 741.1.1 Nonlinear Optics - 744.1 Lasers, General - 744.4 Solid State Lasers - 921.6 Numerical Methods - 932.1 High Energy Physics

Numerical data indexing:Size 3.43E-07m

DOI:10.1117/12.2606840

Database:Compendex

Accession number:20220211444599

Title:Design of hybrid refractive-diffractive star sensor optical system with wide field and small F-number

Authors:Ma, Zehua (1, 2); Wang, Hu (1, 2); Shen, Yang (1, 2); Xue, Yaoke (1, 2); Yan, Haoyu (1, 2)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Shaanxi; Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12069

Part number:1 of 1

Issue title:AOPC 2021: Novel Technologies and Instruments for Astronomical Multi-Band Observations

Issue date:2021

Publication year:2021

Article number:120690W

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510650138

Document type:Conference article (CA)

Conference name:2021 Applied Optics and Photonics China: Novel Technologies and Instruments for Astronomical Multi-Band Observations, AOPC 2021

Conference date:June 20, 2021 - June 22, 2021

Conference location:Beijing, China

Conference code:175885

Sponsor:Chinese Society for Optical Engineering

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">In order to improve the measurement accuracy and detection ability of the star sensor, this paper uses a double Gauss structure with conic aspheric surface and hybrid refractive-diffractive to design an optical system with large field of view of 25°and large relative aperture of 1/1.156, and only 6 lenses are used. First, According to the selected CMOS APS sensor performance parameters, the entrance pupil diameter, field of view, focal length and wavelength range are determined. The field of view is 25°, F number is 1.156, focal length is 52mm, entrance pupil diameter is 45mm, the wavelength range is 500-800nm. The detection of 6 magnitude stars is realized, the probability of capturing 5 navigation stars is 100%, and autonomous navigation recognition is realized. Then, the glass material selection and structure optimization of the optical system are conducted, the optical system is optimized by introducing two conic aspheric surfaces and a diffractive surface. Finally, the influence of the diffraction efficiency of the diffractive optical element on the signal-To-noise ratio is analyzed. After analysis of image quality, the shape of diffuse spot in each field of view is approximately circular, the energy is close to Gaussian distribution, more than 90% of the energy is concentrated in 3×3 pixels, lateral color is less than 1.06μm, and relative distortion is less than 0.87%. The optical system only uses six lenses, the imaging quality meets the imaging requirements of the star sensor, and is beneficial to improve the accuracy and detection capability of the star sensor.<br/></div> © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

Number of references:11

Main heading:Optical design

Controlled terms:Glass - Image quality - Lenses - Optical systems - Signal to noise ratio - Stars - Structural optimization

Uncontrolled terms:Aspheres - Aspheric surfaces - Entrance pupil - F/number - Field of views - Hybrid refractive-diffractive - Large field of view. - Large field of views - Star sensors - Stars: Be

Classification code:657.2 Extraterrestrial Physics and Stellar Phenomena - 716.1 Information Theory and Signal Processing - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 812.3 Glass - 921.5 Optimization Techniques

Numerical data indexing:Percentage 1.00E+02%, Percentage 8.70E-01%, Percentage 9.00E+01%, Size 1.06E-06m, Size 4.50E-02m, Size 5.00E-07m to 8.00E-07m, Size 5.20E-02m

DOI:10.1117/12.2606601

Database:Compendex

Accession number:20220211444597

Title:Optimal design of aspheric Offner compensator based on computer aided program

Authors:Meng, Wen (1, 2); Ma, Zhen (2)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12069

Part number:1 of 1

Issue title:AOPC 2021: Novel Technologies and Instruments for Astronomical Multi-Band Observations

Issue date:2021

Publication year:2021

Article number:120690U

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510650138

Document type:Conference article (CA)

Conference name:2021 Applied Optics and Photonics China: Novel Technologies and Instruments for Astronomical Multi-Band Observations, AOPC 2021

Conference date:June 20, 2021 - June 22, 2021

Conference location:Beijing, China

Conference code:175885

Sponsor:Chinese Society for Optical Engineering

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">This paper presents an automatic optimization method in ZEMAX sequential mode. The user-defined evaluation function and optimization program are written in macro language, which is used to design the Offner null compensation optical path system. The system is designed with a 1m aperture parabolic lens as an example, of two-piece Offner compensation mirror and the optimal parameters of Offner compensator are obtained through optimization. The compensation residual PV value is better than λ/10 and the RMS value is better thanλ/50. This method is a promising attempt of automatic design of compensator, which can design multiple groups of structures on the basis of improving design efficiency, and make the optimal structure which is more closer to actual demand.<br/></div> © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

Number of references:10

Main heading:Structural optimization

Controlled terms:Software testing - Macros

Uncontrolled terms:Automatic optimization - Computer-aided - Evaluation function - Function project - Macro. - Null test - Offne compensator - Optimal design - Optimization method - Sequential mode

Classification code:723.1 Computer Programming - 723.5 Computer Applications - 921.5 Optimization Techniques

Numerical data indexing:Size 1.00E00m

DOI:10.1117/12.2606582

Database:Compendex

Accession number:20213410814836

Title:Influence of spectral characteristics of light sources on measuring space camera modulation transfer function (Open Access)

Title of translation:光源光谱特性对空间相机调制传递函数检测的影响 (Open Access)

Authors:Liu, Shang-Kuo (1, 2); Wang, Tao (1); Li, Kun (1); Cao, Kun (1); Zhang, Xi-Bin (1); Zhou, Yan (1); Zhao, Jian-Ke (1); Yao, Bao-Li (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Liu, Shang-Kuo(liushangkuo@opt.ac.cn)

Source title:Wuli Xuebao/Acta Physica Sinica

Abbreviated source title:Wuli Xuebao

Volume:70

Issue:13

Issue date:July 5, 2021

Publication year:2021

Article number:134208

Language:Chinese

ISSN:10003290

CODEN:WLHPAR

Document type:Journal article (JA)

Publisher:Institute of Physics, Chinese Academy of Sciences

Abstract:<div data-language="eng" data-ev-field="abstract">Modulation transfer function (MTF) measurement is a major means to evaluate the imaging quality of a space camera. The influence caused by the spectral characteristic of light source on the MTF results is not negligible, because the transmittance and color aberration of optical systems, and quantum efficiency of the space camera detectors are all spectrally related. Thus, MTF results tested by different light sources are different from each other. To address this problem, we propose a method to analyze the influence of spectral characteristics of light sources on measuring the MTF of space cameras. In addition, the devices and methods are designed to calibrate the spectral response and monochrome point spread function (PSF) of space camera. A Sigma lens (focal length: 1000mm, F number: 5.6) and a Cannon EOS 5DSR camera (pixel size: 4.14 μm) are combined into an experimental space camera, whose spectral response is calibrated with a monochromator (Omno30300, NBeT) and a spectral radiometer (FieldSpec, ASD). We calibrate the monochrome PSF of the Sigma lens with the same monochromator and a CCD (PIXIS 1024, Princeton Instruments, pixel size: 13 μm) micro-measuring system (20X objective). During the calibration of spectral response and monochrome PSF, the same collimator (focus: 5000 mm, F number: 10) is used. With using the proposed method and those calibrating data, we compute the theoretical values of the MTF of a space camera measured separately with five different light sources. The results indicate that MTF measured by a xenon lamp is greatly different from those MTFs measured by the other four light sources. Comparisons of those theoretically calculated MTFs, separately, show that the MTF measured by a tungsten halogen lamp is greater than the MTF measured by a xenon lamp at each spatial frequency. The deviation between those two lamps reaches a maximum value of 0.075 in the medium-high frequency zone. Furthermore, in order to verify those theoretical conclusions, a platform including a collimator and the previous space camera is constructed. The MTFs measured by a tungsten halogen lamp and a xenon lamp are computed with the slanted-edge method respectively. The results demonstrate that the distributions and deviations of the MTFs tested by those two lamps are identical to those theoretical results at each spatial frequency, with the maximum deviation being 0.057. The theoretical and experimental results demonstrate that the suggested method can accurately calculate the influence of spectral characteristics of light sources on measuring MTF of space cameras. The proposed method can also be adopted to investigate the influence of spectral characteristics of light sources on MTF of optical systems in the design or test stages.<br/></div> © 2021 Chinese Physical Society.

Number of references:25

Main heading:Optical transfer function

Controlled terms:Modulation - Monochromators - Cameras - Pixels - Tungsten - Optical systems - Xenon

Uncontrolled terms:High frequency HF - Modulation transfer function measurements - Slanted-edge method - Spectral characteristics - Spectral radiometers - Spectral response - Theoretical values - Tungsten halogen lamp

Classification code:543.5 Tungsten and Alloys - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 742.2 Photographic Equipment - 804 Chemical Products Generally

Numerical data indexing:Size 1.00e+00m, Size 1.30e-05m, Size 4.14e-06m, Size 5.00e+00m

DOI:10.7498/aps.70.20201575

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20210809975869

Title:Techniques for On-orbit Calibration of Space Optical Imaging Systems Based on Auto-collimation

Title of translation:基于自准直原理的空间光学成像系统在轨几何定标技术

Authors:Zhao, Hengxiang (1, 2); Li, Libo (1); Feng, Yutao (1); Li, Yong (1); Liu, Wei (3); Wu, Junqiang (1); Yan, Peng (1); Bai, Qinglan (1)

Author affiliation:(1) Xi'an Institute of Optics Precision Mechanic of Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Xi'an Research Institute of Surveying and Mapping, Xi'an; 710054, China

Corresponding author:Feng, Yutao(fytciom@126.com)

Source title:Guangzi Xuebao/Acta Photonica Sinica

Abbreviated source title:Guangzi Xuebao

Volume:50

Issue:1

Issue date:January 25, 2021

Publication year:2021

Article number:0112003

Language:Chinese

ISSN:10044213

CODEN:GUXUED

Document type:Journal article (JA)

Publisher:Chinese Optical Society

Abstract:Through the analysis of imaging principle, simulation of optical model and construction of the principle prototype, the main factors affecting the calibration accuracy of the autocollimation calibration system in the experimental environment are discussed, and the main issues of the calibration system are put forward, which should be noticed in the design and work, including pixel size selection, image point location algorithm, focus amount calculation and system installation error. According to the analysis results, the calibration error of the principle prototype is corrected. Finally, the calibration accuracy of the principle prototype is less than 0.4 mm, and the calibration accuracy of the rotation in X, Y and Z directions are less than 0.6", 0.6" and 12" respectively. The relative error of accuracy is better than 0.2%.<br/> © 2021, Science Press. All right reserved.

Number of references:18

Main heading:Calibration

Controlled terms:Ion beams - Errors

Uncontrolled terms:Calibration accuracy - Calibration error - Calibration system - Experimental environment - Imaging principle - On-orbit calibration - Optical imaging system - System installation

Classification code:932.1 High Energy Physics

Numerical data indexing:Percentage 2.00e-01%, Size 4.00e-04m

DOI:10.3788/gzxb20215001.0112003

Funding details: Number: 2019JQ-931, Acronym: -, Sponsor: -;Number: 41005019, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: XAB 2016A07, Acronym: CAS, Sponsor: Chinese Academy of Sciences;

Funding text:Foundation item：National Natural Science Foundation of China（No. 41005019），Fund for Young Scientists from West Academy of Sciences（No. XAB 2016A07），Natural Science Basic Research Program of Shannxi China（No. 2019JQ-931）National Natural Science Foundation of China (No. 41005019), Fund for Young Scientists from West China, Chinese Academy of Sciences (No. XAB 2016A07), Natural Science Basic Research Program of Shannxi China (No. 2019JQ-931).

Database:Compendex

Accession number:20221311844089

Title:Classification of Common Urinary Pathogens Based on Hyperspectral Microscope Imaging

Authors:Tao, Chenglong (1, 2); Du, Jian (1); Wang, Quan (1, 3); Hu, Bingliang (1, 3); Zhang, Zhoufeng (1, 3)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Key Laboratory of Biomedical Spectroscopy of Xi'an, Xi'an; 710119, China

Corresponding author:Zhang, Zhoufeng(zhangzhoufeng@opt.ac.cn)

Source title:Proceedings of 2021 IEEE 2nd International Conference on Information Technology, Big Data and Artificial Intelligence, ICIBA 2021

Abbreviated source title:Proc. IEEE Int. Conf. Inf. Technol., Big Data Artif. Intell., ICIBA

Part number:1 of 1

Issue title:Proceedings of 2021 IEEE 2nd International Conference on Information Technology, Big Data and Artificial Intelligence, ICIBA 2021

Issue date:2021

Publication year:2021

Pages:850-853

Language:English

ISBN-13:9781665428767

Document type:Conference article (CA)

Conference name:2nd IEEE International Conference on Information Technology, Big Data and Artificial Intelligence, ICIBA 2021

Conference date:December 17, 2021 - December 19, 2021

Conference location:Chongqing, China

Conference code:176951

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">All the time, common pathogens in urine have been threatening human health even lives. Though Chromogenic plates is able to detect urinary bacteria, another technique and material need to be introduced for coloration. However, this kind of technique and material is not always specific. Therefore, how to rapidly detect and classify these bacteria is a tricky challenge waiting to be overcome. For solving this problem, we use hyperspectral imaging (HSI) and random forest (RF) to classify four strains of common pathogens in the urinary, which include E.faeca, K.pneum, S.aureu, and S.pneum. HSI is able to obtain spatial and hyperspectral information of the object. RF boosts classifying accuracy by combining many decision trees. Utilizing HSI and RF, we find that these bacteria can be separated well at the cellular level.<br/></div> © 2021 IEEE.

Number of references:11

Main heading:Bacteria

Controlled terms:Decision trees - Pathogens - Spectroscopy - Hyperspectral imaging - Random forests

Uncontrolled terms:Colouration - Human health - HyperSpectral - Hyperspectral information - Hyperspectral microscope imaging - Microscope imaging - Random forests - Separated wells - Spatial informations - Urinary pathogen

Classification code:461.9 Biology - 723.4.2 Machine Learning - 746 Imaging Techniques - 921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory - 961 Systems Science

DOI:10.1109/ICIBA52610.2021.9687907

Database:Compendex

Accession number:20220811682279

Title:Design of off-axis compact optical system with large relative aperture and large field of view

Authors:Ren, Zhiguang (1, 2); Li, Xuyang (1); Wang, Wei (1); Yao, Rui (1, 2); Ma, Zixuan (1, 2); Chu, Nanqing (1, 2)

Author affiliation:(1) Space Optics Technology Lab, Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Li, Xuyang(lixuyang2004@126.com)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12070

Part number:1 of 1

Issue title:10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes

Issue date:2021

Publication year:2021

Article number:1207005

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510650152

Document type:Conference article (CA)

Conference name:10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes 2021

Conference date:June 14, 2021 - June 17, 2021

Conference location:Chengdu, China

Conference code:176905

Sponsor:Institute of Optics and Electronics (IOE), Chinese Academy of Sciences; The Chinese Optical Society (COS)

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">In order to deal with the threat of space debris to space experiment platforms and equipment, three-mirror anastigmatic system, which has the characteristics of light weight, small size and good optical performance, are used for space debris detection and detailed imaging. With the development of freeform surfaces, this article shows a new type of structure which has good optical performance and simple complexity of assembly and adjustment. The first step is to analyze the calculation method of the initial structure parameters of TMA system, and then the secondary mirror adopts the XY polynomial freeform surface. The primary mirror is reused as tertiary mirror, and the design of a new type TMA system is finally completed. Its effective focal length is 400 mm, the field of view (FOV) is 2°×4°, F/# is 5. At the Nyquist frequency 108lp/mm, the MTF value of this system is greater than 0.588. The maximum distortion is less than 0.80%. The results show that the imaging quality of the system meets the design requirements in the effective field of view.<br/></div> © 2021 SPIE

Number of references:10

Main heading:Optical systems

Controlled terms:Mirrors - Space debris - Space platforms

Uncontrolled terms:Aperture fields - Field of views - Free-form surface - Integrated designs - Large field of views - Large relative aperture - Off-axis - Optical performance - TMA system - XY polynomial

Classification code:655.1 Spacecraft, General - 656.1 Space Flight - 741.3 Optical Devices and Systems

Numerical data indexing:Percentage 8.00E-01%, Size 4.00E-01m

DOI:10.1117/12.2604049

Database:Compendex

Accession number:20202608862729

Title:Heart-Rate Monitoring with an Ethyl Alpha-Cyanoacrylate Based Fiber Fabry-Perot Sensor

Authors:Li, Yang (1); Dong, Bo (1); Chen, Enqing (2); Wang, Xiaoli (2); Zhao, Yudi (2)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China; (2) University of Chinese Academy of Sciences, Beijing, China

Corresponding author:Dong, Bo(bdong@opt.ac.cn)

Source title:IEEE Journal of Selected Topics in Quantum Electronics

Abbreviated source title:IEEE J Sel Top Quantum Electron

Volume:27

Issue:4

Issue date:July-August 2021

Publication year:2021

Article number:9115895

Language:English

ISSN:1077260X

E-ISSN:15584542

CODEN:IJSQEN

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc., United States

Abstract:Heart-rate monitoring with an ethyl alpha-cyanoacrylate (EtCNA) based fiber Fabry-Perot (F-P) sensor is presented. The fiber F-P sensor is fixed in a capillary tube by using the EtCNA binder. Due to the lower Young's modulus of the EtCNA, the sensor can detect low frequency vibration with a high sensitivity. The fiber sensor is attached in a specially designed bracket to obtain the stable data. When the sensor with bracket is put on the human body, the heart-rate can be monitored accurately by monitoring the laser intensity variation induced by the heartbeat. Experimental results show that the sensor has the strain sensitivity of 2.57 pm/μN with good responses to low frequency vibrations of 1 Hz, 2 Hz and 3 Hz. The maximum and the minimum mean square deviations of the volunteers' data are 4.434210 and 0.667499, respectively. Moreover, it has good adaptability to measure the heart-rate on different positions of human body, such as wrist, chest and neck. Due to the advantages of small size, low cost, good adaptability, pollution-free and no harm to body. Our proposed sensor is expected to be widely used in heart disease monitoring.<br/> © 1995-2012 IEEE.

Number of references:39

Main heading:Heart

Controlled terms:Patient monitoring - Elastic moduli - Fabry-Perot interferometers - Fiber optic sensors - Fibers

Uncontrolled terms:Fiber Fabry-Perot - Fiber Fabry-Perot sensor - Heart-rate monitoring - High sensitivity - Laser intensities - Low-frequency vibration - Minimum mean squares - Strain sensitivity

Classification code:461.2 Biological Materials and Tissue Engineering - 461.6 Medicine and Pharmacology - 741.1.2 Fiber Optics - 941.3 Optical Instruments - 951 Materials Science

Numerical data indexing:Frequency 1.00e+00Hz, Frequency 2.00e+00Hz, Frequency 3.00e+00Hz

DOI:10.1109/JSTQE.2020.3002084

Funding details: Number: Y829321213, Acronym: CAS, Sponsor: Chinese Academy of Sciences;

Funding text:Manuscript received April 13, 2020; revised June 3, 2020; accepted June 8, 2020. Date of publication June 12, 2020; date of current version July 14, 2020. This work is supported in part by the CAS Pioneer Hundred Talents Program Y829321213. (Corresponding author: Bo Dong.) Yang Li is with the State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China, and also with the University of Chinese Academy of Sciences, Beijing 100049, China (e-mail: liyang185@mails.ucas.ac.cn).

Database:Compendex

Accession number:20212010361118

Title:Photonic radio frequency channelizers based on Kerr optical micro-combs (Open Access)

Authors:Tan, Mengxi (1); Xu, Xingyuan (2); Wu, Jiayang (1); Nguyen, Thach G. (3); Chu, Sai T. (4); Little, Brent E. (5); Morandotti, Roberto (6, 7); Mitchell, Arnan (3); Moss, David J. (1)

Author affiliation:(1) Optical Sciences Centre, Swinburne University of Technology, Hawthorn; VIC; 3122, Australia; (2) Electro-Photonics Laboratory, Department of Electrical and Computer Systems Engineering, Monash University, VIC; 3800, Australia; (3) School of Engineering, RMIT University, Melbourne; VIC; 3001, Australia; (4) Department of Physics, City University of Hong Kong, Hong Kong, Hong Kong; (5) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Science, Xi'an; 710119, China; (6) INRS Ͽ Energie, Matériaux et Télécommunications, 1650 Boulevard Lionel-Boulet, Varennes; QC; J3X 1S2, Canada; (7) Frontier Sciences, University of Electronic Science and Technology of China, Chengdu; 610054, China

Corresponding author:Moss, David J.(dmoss@swin.edu.au)

Source title:Journal of Semiconductors

Abbreviated source title:J. Semicond.

Volume:42

Issue:4

Issue date:April 2021

Publication year:2021

Article number:041302

Language:English

ISSN:16744926

Document type:Journal article (JA)

Publisher:IOP Publishing Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">We review recent work on broadband RF channelizers based on integrated optical frequency Kerr micro-combs combined with passive micro-ring resonator filters, with microcombs having channel spacings of 200 and 49 GHz. This approach to realizing RF channelizers offers reduced complexity, size, and potential cost for a wide range of applications to microwave signal detection.<br/></div> © 2021 Chinese Institute of Electronics.

Number of references:178

Main heading:Natural frequencies

Controlled terms:Optical resonators - Optical materials - Microwave resonators

Uncontrolled terms:Channel spacings - Channelizers - Microcombs - Microring resonator - Microwave signal detection - Optical frequency - Photonic radios - Reduced complexity

Classification code:714 Electronic Components and Tubes - 741.3 Optical Devices and Systems

Numerical data indexing:Frequency 2.00e+11Hz, Frequency 4.90e+10Hz

DOI:10.1088/1674-4926/42/4/041302

Database:Compendex

Open Access type(s): All Open Access, Green

Accession number:20204509461729

Title:Small Moving Target Recognition in Star Image with TRM

Authors:Du, Yun (1, 2, 3); Wen, Desheng (1); Liu, Guizhong (2); Qiu, Shi (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an; 710049, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding authors:Du, Yun(duyun@opt.ac.cn); Qiu, Shi(qiushi215@163.com)

Source title:International Journal of Pattern Recognition and Artificial Intelligence

Abbreviated source title:Int J Pattern Recognit Artif Intell

Volume:35

Issue:2

Issue date:February 2021

Publication year:2021

Article number:2150004

Language:English

ISSN:02180014

CODEN:IJPIEI

Document type:Journal article (JA)

Publisher:World Scientific

Abstract:Recognition of small moving targets in space has become one of the frontier scientific researches in recent decade. Most of them focus on detection and recognition in star image with sidereal stare mode. However, in this research field, few researches are about detection and recognition in star image with track rate mode. In this paper, a novel approach is proposed to recognize the moving target in single frame by machine learning method based on elliptical characteristic extraction of star points. The technical path about recognition of moving target in space is redesigned instead of traditional processing approaches. Elliptical characteristics of each star point can be successfully extracted from single image. Machine learning can achieve the classification goal in order to make sure that all moving targets can be extracted. The experiments show that our proposed approach can have better performance in star images with different qualities.<br/> © 2021 World Scientific Publishing Company.

Number of references:47

Main heading:Stars

Controlled terms:Machine learning - Image processing

Uncontrolled terms:Characteristic extraction - Machine learning methods - Moving targets - Research fields - Scientific researches - Single frames - Small moving target - Traditional processing

Classification code:657.2 Extraterrestrial Physics and Stellar Phenomena - 723.2 Data Processing and Image Processing - 723.4 Artificial Intelligence

DOI:10.1142/S021800142150004X

Database:Compendex

Accession number:20212010361090

Title:Orthogonally polarized RF optical single sideband generation with integrated ring resonators

Authors:Tan, Mengxi (1); Xu, Xingyuan (2); Wu, Jiayang (1); Nguyen, Thach G. (3); Chu, Sai T. (4); Little, Brent E. (5); Mitchell, Arnan (3); Morandotti, Roberto (6, 7); Moss, David J. (1)

Author affiliation:(1) Optical Sciences Centre, Swinburne University of Technology, Hawthorn; VIC; 3122, Australia; (2) Electro-Photonics Laboratory, Department of Electrical and Computer Systems Engineering, Monash University, VIC; 3800, Australia; (3) School of Engineering, RMIT University, Melbourne; VIC; 3001, Australia; (4) Department of Physics, City University of Hong Kong, Hong Kong, Hong Kong; (5) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Science, Xi'an; 710119, China; (6) INRS Ͽ Energie, Matériaux et Télécommunications, 1650 Boulevard Lionel-Boulet, Varennes; QC; J3X 1S2, Canada; (7) Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu; 610054, China

Corresponding author:Moss, David J.(dmoss@swin.edu.au)

Source title:Journal of Semiconductors

Abbreviated source title:J. Semicond.

Volume:42

Issue:4

Issue date:April 2021

Publication year:2021

Article number:041305

Language:English

ISSN:16744926

Document type:Journal article (JA)

Publisher:IOP Publishing Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">We review recent work on narrowband orthogonally polarized optical RF single sideband generators as well as dual-channel equalization, both based on high-Q integrated ring resonators. The devices operate in the optical telecommunications C-band and enable RF operation over a range of either fixed or thermally tuneable frequencies. They operate via TE/TM mode birefringence in the resonator. We achieve a very large dynamic tuning range of over 55 dB for both the optical carrier-to-sideband ratio and the dual-channel RF equalization for both the fixed and tunable devices.<br/></div> © 2021 Chinese Institute of Electronics.

Number of references:87

Main heading:Microwave photonics

Controlled terms:Equalizers - Optical resonators - Microwave resonators

Uncontrolled terms:Dynamic tuning - Narrow bands - Optical carriers - Optical single side bands - Optical telecommunication - Ring resonator - Single side bands - Tunable device

Classification code:713.5 Electronic Circuits Other Than Amplifiers, Oscillators, Modulators, Limiters, Discriminators or Mixers - 714 Electronic Components and Tubes - 741.1 Light/Optics - 741.3 Optical Devices and Systems

Numerical data indexing:Decibel 5.50e+01dB

DOI:10.1088/1674-4926/42/4/041305

Database:Compendex

Accession number:20210309771358

Title:Smart Optic Fiber Mattress for Animal Sleep Continuous Monitoring Based Multi-Modal Interferometer

Authors:Li, Yang (1); Dong, Bo (1); Zhao, Yudi (2); Chen, Enqing (2); Wang, Xiaoli (2); Zhao, Wei (1); Wang, Yishan (1)

Corresponding author:Dong, Bo(bdong@opt.ac.cn)

Source title:Journal of Lightwave Technology

Abbreviated source title:J Lightwave Technol

Volume:39

Issue:12

Issue date:June 15, 2021

Publication year:2021

Pages:4131-4137

Article number:9314182

Language:English

ISSN:07338724

E-ISSN:15582213

CODEN:JLTEDG

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">A smart optic fiber mattress for animal sleep continuous monitoring based on a multi-modal interferometer is presented. The sensor is fabricated by splicing two single mode fibers (SMFs) and a multimode fiber (MMF) with a grid structure. Due to the network structure of the sensor, it has wider contact surface for monitoring vital signs and reduces the detection difficulty caused by the change of measured object position. The sensing unit can be placed under the dog mattress. Experimental results show that it can continuously monitor the sleeping activities and respiration of the dog. The detected information includes activity rhythm, sleeping state and sleeping respiratory rates (SRR). This technique avoids some potential problems such as injuring caused by the sensor appendage and dispute caused by moral principles. It is qualified to be widely used in health care of pets and protection of wildlife.<br/></div> © 1983-2012 IEEE.

Number of references:17

Main heading:Animals

Controlled terms:Single mode fibers - Multimode fibers - Sleep research - Interferometers

Uncontrolled terms:Contact surface - Continuous monitoring - Grid structures - Multi-mode fibers (MMF) - Network structures - Object positions - Potential problems - Respiratory rate

Classification code:461.4 Ergonomics and Human Factors Engineering - 741.1.2 Fiber Optics - 941.3 Optical Instruments

DOI:10.1109/JLT.2020.3048958

Funding details: Number: Y829321213, Acronym: CAS, Sponsor: Chinese Academy of Sciences;

Funding text:Manuscript received October 10, 2020; revised November 26, 2020 and December 22, 2020; accepted December 28, 2020. Date of publication January 5, 2021; date of current version June 16, 2021. This work was supported by CAS Pioneer Hundred Talents Program Y829321213. (Corresponding author: Bo Dong.) Yang Li is with the State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China, and also with the University of Chinese Academy of Sciences, Beijing 100049, China (e-mail: liyang185@mails.ucas.ac.cn).

Database:Compendex

Accession number:20214711192834

Title:Improved Active Disturbance Rejection Control of optoelectronic stabilized platform Based on Reduced-order Extended State Observer

Authors:Gao, Peng (1, 2, 3); Su, Xiuqin (1); Wang, Weifeng (1); Zhang, Wenbo (1, 2, 3)

Author affiliation:(1) Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) School of Electronic and Information Engineering, Xi'An Jiaotong University, Xi'an; 710049, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Gao, Peng(gppaper@163.com)

Source title:IEEE Information Technology, Networking, Electronic and Automation Control Conference, ITNEC 2021

Abbreviated source title:IEEE Inf. Technol., Netw., Electron. Autom. Control Conf., ITNEC

Part number:1 of 1

Issue title:IEEE Information Technology, Networking, Electronic and Automation Control Conference, ITNEC 2021

Issue date:October 15, 2021

Publication year:2021

Pages:889-894

Language:English

ISBN-13:9781665415989

Document type:Conference article (CA)

Conference name:5th IEEE Information Technology, Networking, Electronic and Automation Control Conference, ITNEC 2021

Conference date:October 15, 2021 - October 17, 2021

Conference location:Xi'an, China

Conference code:173516

Sponsor:Chengdu Union Institute of Science and Technology; Chongqing Geeks Education Technology Co., Ltd; Chongqing Global Union Academy of Science and Technology; Global Union Academy of Science and Technology; IEEE Beijing Section; Xi'an Peihua University

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">In order to improve the anti-disturbance ability and dynamic response characteristics of the optoelectronic stabilized platform, an improved linear active disturbance rejection control (ADRC) algorithm is proposed. The algorithm adopts reduced-order extended state observer (RESO) to realize fast tracking and estimating disturbances, which improves the restraining rapidity of disturbances. The Variable Speed Integral Proportional Integral (VSIPI) algorithm is introduced to solve the contradiction between transition speed and response overshoot, so as to obtain faster response speed and lower overshoot. The simulation results show that the algorithm has stronger anti-interference ability and robustness than the traditional PI.<br/></div> © 2021 IEEE.

Number of references:15

Main heading:Two term control systems

Controlled terms:State estimation - Disturbance rejection

Uncontrolled terms:Active disturbances rejection controls - Dynamic response characteristics - Extended state observe - Extended state observer - Optical axis - Opto-electronic stabilized platforms - Reduced order - State observe - Variable speed - Variable speed integral

Classification code:731 Automatic Control Principles and Applications - 731.1 Control Systems

DOI:10.1109/ITNEC52019.2021.9587065

Funding details: Number: E1553201, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: -, Acronym: XIOPM, Sponsor: Xi'an Institute of Optics and Precision Mechanics;Number: -, Acronym: YIPA, Sponsor: Youth Innovation Promotion Association;

Funding text:This work was supported by Youth Innovation Promotion Association, XIOPM, CAS (grant number E1553201).

Database:Compendex

Accession number:20220911706704

Title:An Improved Method of Friction Compensation and Stability Control for Optoelectronic Stabilized Platform

Authors:Gao, Peng (1, 2, 3); Lu, Weiguo (1); Zhang, Wenbo (1, 2, 3)

Corresponding author:Gao, Peng(gaopeng1@opt.ac.cn)

Source title:2021 IEEE Conference on Telecommunications, Optics and Computer Science, TOCS 2021

Abbreviated source title:IEEE Conf. Telecommun., Opt. Comput. Sci., TOCS

Part number:1 of 1

Issue title:2021 IEEE Conference on Telecommunications, Optics and Computer Science, TOCS 2021

Issue date:2021

Publication year:2021

Pages:424-427

Language:English

ISBN-13:9781665424981

Document type:Conference article (CA)

Conference name:2021 IEEE Conference on Telecommunications, Optics and Computer Science, TOCS 2021

Conference date:December 10, 2021 - December 11, 2021

Conference location:Shenyang, China

Conference code:176697

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">In order to improve the anti-disturbance ability of the optoelectronic stabilized platform, an improved active disturbance rejection control algorithm is proposed, which combines LuGre friction model and linear reduced extended state observer. Firstly, LuGre friction model is established to compensate the friction torque of bearing. Then, the friction compensation error and other disturbances are regarded as an extended state, which is estimated by a linear reduced-order extended state observer. The estimated value is fed back to the controller to further compensate the disturbance. The improved ADRC algorithm has superior disturbance rejection ability taking advantage of the accurate compensation of LuGre model and the adaptation of extended state observation. Experimental results show that the improved algorithm can well suppress external interferences and significantly improve the ability of anti-interference and tracking response of the system.<br/></div> © 2021 IEEE.

Number of references:13

Main heading:Error compensation

Controlled terms:Disturbance rejection - State estimation

Uncontrolled terms:Active disturbances rejection controls - Compensation control - Extended state observer - Friction compensation - Linear reduced extended state observe - LuGre friction model - LuGre model - Opto-electronic stabilized platforms - Stability control - State observe

Classification code:731 Automatic Control Principles and Applications - 731.1 Control Systems

DOI:10.1109/TOCS53301.2021.9688889

Database:Compendex

Accession number:20212010359826

Title:Hyperspectral Anomaly Detection Based on 3D Convolutional Autoencoder and Low Rank Representation

Title of translation:基于3D卷积自编解码器和低秩表示的高光谱异常检测

Authors:Sun, Bangyong (1, 2); Zhao, Zhe (1); Hu, Bingliang (2); Yu, Tao (2)

Author affiliation:(1) College of Printing, Packaging and Digital Media, Xi'an University of Technology, Xi'an; 710048, China; (2) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China

Corresponding author:Yu, Tao(yutao@opt.ac.cn)

Source title:Guangzi Xuebao/Acta Photonica Sinica

Abbreviated source title:Guangzi Xuebao

Volume:50

Issue:4

Issue date:April 25, 2021

Publication year:2021

Article number:0410003

Language:Chinese

ISSN:10044213

CODEN:GUXUED

Document type:Journal article (JA)

Publisher:Chinese Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">Due to the challenge of high dimensionality, insufficient utilization of spatial-spectral information and limited local structure property expression in hyperspectral images, a hyperspectral anomaly detection algorithm based on 3D convolutional autoencoder and low rank representation is proposed in this paper. Firstly, the spectral-spatial features of hyperspectral images are extracted by 3D convolutional autoencoder. In order to precisely represent the local similarity, a new loss function is proposed to constrain the central pixel and it's surrounding pixels to extract more discriminative features. And then, the Density Based Spatial Clustering of Applications with Noise (DBSCAN) algorithm is used to construct the background dictionary, and the abnormal region is separated by low rank representation on the feature map. Finally, the detection result is obtained by fusing the reconstruction error obtained by 3D convolution autoencoder and abnormal region detection result. We carry out objective and subjective anomaly detection experiments on two real hyperspectral datasets. The results demonstrate that the proposed algorithm detect abnormal targets more accurately compared with other algorithms.<br/></div> © 2021, Science Press. All right reserved.

Number of references:32

Main heading:Convolution

Controlled terms:Learning systems - Spectroscopy - Clustering algorithms - Anomaly detection - Pixels

Uncontrolled terms:Density-based spatial clustering of applications with noise - Detection experiments - Discriminative features - High dimensionality - Hyperspectral anomaly detection - Low-rank representations - Reconstruction error - Spectral information

Classification code:716.1 Information Theory and Signal Processing - 903.1 Information Sources and Analysis

DOI:10.3788/gzxb20215004.0410003

Funding details: Number: 62076199, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2019M653784, Acronym: -, Sponsor: China Postdoctoral Science Foundation;Number: -, Acronym: -, Sponsor: National Defense Science and Technology Innovation Fund of the Chinese Academy of Sciences;

Funding text:Foundation item：National Natural Science Foundation of China（No.62076199），National Defense Science and Technology Innovation Special Zone Project（No.XXX-ZT-00X-014-01），China Postdoctoral Science Foundation（No. 2019M653784），Key Laboratory of Spectral Imaging Technology of Chinese Academy of Sciences（No.LSIT201801D）National Natural Science Foundation of China (No.62076199), National Defense Science and Technology Innovation Special Zone Project (No.XXX-ZT-00X-014-01), China Postdoctoral Science Foundation (No. 2019M653784), Key Laboratory of Spectral Imaging Technology of Chinese Academy of Sciences (No.LSIT201801D).

Database:Compendex

Accession number:20211310141478

Title:Frontiers in science and applications for attosecond light source (Open Access)

Title of translation:阿秒光源前沿科学与应用 (Open Access)

Authors:Fu, Yuxi (1, 2)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) School of Optoelectronics, University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Fu, Yuxi(fuyuxi@opt.ac.cn)

Source title:Kexue Tongbao/Chinese Science Bulletin

Abbreviated source title:Kexue Tongbao/Chin. Sc. Bull.

Volume:66

Issue:8

Issue date:March 15, 2021

Publication year:2021

Pages:833-834

Language:Chinese

ISSN:0023074X

E-ISSN:20959419

Document type:Journal article (JA)

Publisher:Chinese Academy of Sciences

Number of references:14

DOI:10.1360/TB-2020-1672

Database:Compendex

Open Access type(s): All Open Access, Bronze

Accession number:20215011321430

Title:Fiber-coupled Chromatic Confocal 3D Measurement System and Comparative Study of Spectral Data Processing Algorithms

Title of translation:光纤式色散共焦三维测量系统及算法比较研究

Authors:Wang, Jiayi (1); Liu, Tao (1); Tang, Xiaofeng (1); Hu, Jiaqi (1); Wang, Xing (2); Li, Guoqing (1); He, Tao (1); Yang, Shuming (1)

Author affiliation:(1) State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an; 710049, China; (2) Key Laboratory of Ultra&Hscr;fast Photoelectric Diagnostics Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China

Corresponding author:Liu, Tao(liu8483@xjtu.edu.cn)

Source title:Guangzi Xuebao/Acta Photonica Sinica

Abbreviated source title:Guangzi Xuebao

Volume:50

Issue:11

Issue date:November 25, 2021

Publication year:2021

Article number:1112001

Language:Chinese

ISSN:10044213

CODEN:GUXUED

Document type:Journal article (JA)

Publisher:Chinese Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">A simple aspheric chromatic dispersion lens group of low cost is designed using Zemax, and an integrated fiber-coupled chromatic confocal 3D measurement system is developed. Performances of four peak wavelength extraction methods, i.e. the maximum method, centroid method, Gaussian fitting method and spline interpolation method, have been compared and analyzed quantitatively. In addition, calibration accuracy of Gaussian fitting method and spline interpolation method is tested and compared through the axial resolution and displacement measurement experiments. The experimental results show that the axial measurement range of the built system is 1 mm. The Gaussian fitting method has higher accuracy and better stability among the four peak extraction algorithms. The axial resolution of the system using Gaussian fitting based and spline interpolation based calibration methods can both reach 0.2 μm and the displacement measurement accuracy is better than 1% within the whole measurement range; a quartz glass with a thickness of 0.219 mm is measured, and the relative measurement error of the average value is 0.5%. Finally, the developed system is applied to the 3D surface measurement of a step structure, a flexible electrode and a MEMS unit, and the experimental results indicate that the proposed system can perform high-precision 3D measurements of complex microstructures and transparent material thicknesses.<br/></div> © 2021, Science Press. All right reserved.

Number of references:25

Main heading:Calibration

Controlled terms:Chromatic dispersion - Interpolation - Surface measurement - Displacement measurement - Gaussian distribution - Gaussian noise (electronic) - Extraction

Uncontrolled terms:3-D measurement - 3-D measurement systems - Chromatic confocal - Fiber coupled - Film-thickness - Fitting method - Gaussian fitting - Interpolation method - Spectral dispersions - Spline interpolation

Classification code:711.1 Electromagnetic Waves in Different Media - 802.3 Chemical Operations - 921.6 Numerical Methods - 922.1 Probability Theory - 922.2 Mathematical Statistics - 943.2 Mechanical Variables Measurements

Numerical data indexing:Percentage 1.00E00%, Percentage 5.00E-01%, Size 1.00E-03m, Size 2.00E-07m, Size 2.19E-04m

DOI:10.3788/gzxb20215011.1112001

Funding details: Number: 2020ZDLGY04-02, Acronym: -, Sponsor: Shanxi Provincial Key Research and Development Project;

Funding text:Key Research and Development Program of Shaanxi Province (Nos.2021ZDLGY12-06, 2020ZDLGY04-02), Science and Technology Innovation Group of Shaanxi Province (No.2019TD-011)

Database:Compendex

Accession number:20210509874581

Title:Research of robotic spherical polishing end effector based on finite element simulation

Authors:Mu, Ruixin (1, 2); Zhang, Jian (2, 3)

Author affiliation:(1) Xi'an Institute of Optical and Precision Mechanics, Chinese Academy of Science, Xi'an; 710119, China; (2) University of Chinese Academy of Science, Beijing; 100049, China; (3) School of Mechanoelectronic Engineering, Xidian University, Xi'an; 710071, China

Corresponding author:Zhang, Jian(zj@opt.ac.cn)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11761

Part number:1 of 1

Issue title:Fourth International Conference on Photonics and Optical Engineering

Issue date:2021

Publication year:2021

Article number:117611R

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510643574

Document type:Conference article (CA)

Conference name:4th International Conference on Photonics and Optical Engineering

Conference date:October 15, 2020 - October 16, 2020

Conference location:Xi'an, China

Conference code:166676

Publisher:SPIE

Abstract:In this paper, using Preston hypothesis and CCOS removal model, analyzing removal function of the spherical polishing end is analyzed as Gaussian distribution, four schemes are proposed to design the robot optical spherical polishing end effector. Through the analysis and comparison of advantages and disadvantages, an optimal solution is obtained and a standardized design is carried out to realize the synthesis of revolution and rotation of the spherical polishing wheel. The design of the spherical polishing tool adopts bevel gear transmission, belt transmission and planetary gear structure. When the motor input is 200r/min, by adjusting the specifications of the pulley, the spherical polishing wheel can achieve a revolution speed of 60r/min and a rotation speed of 100&sim;400r/min. After the design is completed, finite element analysis is performed on the important parts of the structure, and the designed structure meets the strength requirements.<br/> © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

Number of references:15

Main heading:Finite element method

Controlled terms:Wheels - Industrial research - Machine design - Structural design - Bevel gears - Polishing - Spheres - End effectors

Uncontrolled terms:Belt transmissions - Finite element simulations - Gear transmissions - Optimal solutions - Polishing wheels - Removal function - Revolution and rotations - Revolution speed

Classification code:408.1 Structural Design, General - 601 Mechanical Design - 601.2 Machine Components - 604.2 Machining Operations - 731.5 Robotics - 901.3 Engineering Research - 912.1 Industrial Engineering - 921.6 Numerical Methods

Numerical data indexing:Rotational_Speed 2.00e+02RPM, Rotational_Speed 6.00e+01RPM

DOI:10.1117/12.2584956

Database:Compendex

Accession number:20214811256426

Title:Classification of Pneumonia Images Based on Improved VGG19 Convolutional Neural Network (Invited)

Title of translation:基于改进VGG19卷积神经网络的肺炎图像分类(特邀)

Authors:Xiong, Feng (1); He, Di (1); Liu, Yujie (1); Qi, Meijie (1); Gao, Peng (1); Zhang, Zhoufeng (2); Liu, Lixin (1, 2)

Author affiliation:(1) School of Physics and Optoelectronic Engineering, Xidian University, Xi'an; 710071, China; (2) CAS Key Laboratory of Spectral Imaging Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China

Corresponding authors:Liu, Lixin(lxliu@xidian.edu.cn); Liu, Lixin(lxliu@xidian.edu.cn)

Source title:Guangzi Xuebao/Acta Photonica Sinica

Abbreviated source title:Guangzi Xuebao

Volume:50

Issue:10

Issue date:October 25, 2021

Publication year:2021

Article number:1010001

Language:English

ISSN:10044213

CODEN:GUXUED

Document type:Journal article (JA)

Publisher:Chinese Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">In this paper, two improved network models, SVM (Linear)-based VGG19 and XGBoost-based VGG19, are constructed by combining the VGG19 convolutional neural network with two machine learning algorithms. Moreover, the VGG19 model and the two improved models are employed to classify bacterial pneumonia and viral pneumonia images. Additionally, the performances of the three models are evaluated and compared, the results show that the average accuracies of the three models are all above 85.9%. The improved VGG19 models show superior stability in accuracy over conventional VGG19 model, and the comprehensive performance of XGBoost-based VGG19 model is best, which verifies the effectiveness of deep learning models combined with machine learning models.<br/></div> © 2021, Science Press. All right reserved.

Number of references:18

Main heading:Support vector machines

Controlled terms:Image enhancement - Adaptive boosting - Deep learning - Learning systems - Image classification - Convolution - Convolutional neural networks

Uncontrolled terms:Convolution neural network - Convolutional neural network - Deep learning - Extreme gradient boosting - Gradient boosting - Images classification - Pneumonia image classification - Support vectors machine - Three models - VGG19

Numerical data indexing:Percentage 8.59E+01%

DOI:10.3788/gzxb20215010.1010001

Funding details: Number: LSIT202005W, Acronym: -, Sponsor: -;Number: 62075177, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: B17035, Acronym: -, Sponsor: Higher Education Discipline Innovation Project;

Funding text:National Natural Science Foundation of China (No. 62075177), the Open Research Fund of CAS Key Laboratory of Spectral Imaging Technology (No. LSIT202005W), the 111 Project (No. B17035)

Database:Compendex

Accession number:20212710587204

Title:Digital micromirror device based ptychographic phase microscopy

Authors:Zheng, Juanjuan (1, 2, 3); Wen, Kai (1); Gao, Zhaolin (1); Zalevsky, Zeev (4); Gao, Peng (1)

Author affiliation:(1) School of Physics and Optoelectronic Engineering, Xidian University, Xi'an; 710071, China; (2) Academy of Advanced Interdisciplinary Research, Xidian University, Xi'an; 710071, China; (3) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China; (4) Bar-Ilan University, Faculty of Engineering and Nano Technology Center, Ramat-Gan, Israel

Corresponding author:Gao, Peng(peng.gao@xidian.edu.cn)

Source title:Optics Communications

Abbreviated source title:Opt Commun

Volume:498

Issue date:November 1, 2021

Publication year:2021

Article number:127218

Language:English

ISSN:00304018

CODEN:OPCOB8

Document type:Journal article (JA)

Publisher:Elsevier B.V.

Abstract:<div data-language="eng" data-ev-field="abstract">In this paper, ptychographic phase microscopy (PPM) with digital illumination addressing via a digital micromirror device (DMD) was demonstrated. A moving circular pattern is sequentially lighted up by a DMD and projected on the sample for illumination stepping, and a CCD camera records the generated diffraction patterns. Then, the quantitative phase distribution of the sample can be reconstructed from the diffraction patterns by using an iterative algorithm. Compared with conventional PPM approaches, this method has a fundamentally enhanced imaging speed due to the usage of the digital scan to replace the conventional mechanical scan. Furthermore, parallelized illumination strategy, which loads multiple pupils to DMD simultaneously, is used to further improve the imaging speed to 0.8 s per phase image. We envisage that this method will contribute to high-contrast, quantitative phase imaging of transparent samples without labeling.<br/></div> © 2021 Elsevier B.V.

Number of references:35

Main heading:Diffraction patterns

Controlled terms:Image enhancement - CCD cameras - Interferometry - Iterative methods

Uncontrolled terms:Circular pattern - Digital micromirror device - Digital scans - Imaging speed - Iterative algorithm - Phase distribution - Ptychographic phase microscopy - Ptychography - Quantitative phase microscopy

Classification code:714.2 Semiconductor Devices and Integrated Circuits - 742.2 Photographic Equipment - 921.6 Numerical Methods - 941.4 Optical Variables Measurements

Numerical data indexing:Time 8.00E-01s

DOI:10.1016/j.optcom.2021.127218

Funding details: Number: -, Acronym: SKLTOP, Sponsor: State Key Laboratory of Transient Optics and Photonics;Number: 2020JK-193, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;Number: 2020JQ-324, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;Number: JB210513, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;Number: JC2112, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;Number: NSFC 62075177, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: XJS210504, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;Number: XJS210504, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;

Funding text:National Natural Science Foundation of China (NSFC 62075177); Shaanxi Natural Science Foundation of Shaanxi Province, China (2020JK-193, 2020JQ-324); the Fundamental Research Funds for the Central Universities (JB210513, JC2112, XJS210504 and XJS210504); Key Laboratory of Image Processing and Pattern Recognition, China, Jiangxi Province (ET202080417); Research Fund of State Key Laboratory of Transient Optics and Photonics, China.

Database:Compendex

Accession number:20211310141835

Title:Development and prospect on driving laser for attosecond pulse

Title of translation:阿秒脉冲驱动激光发展现状及展望

Authors:Yuan, Hao (1, 2); Cao, Huabao (1); Wang, Hushan (1); Liu, Xin (1, 2); Sun, Xianwei (1); Wang, Yishan (1); Zhao, Wei (1); Fu, Yuxi (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) School of Future Technology, University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding authors:Wang, Yishan(yswang@opt.ac.cn); Zhao, Wei(weiz@opt.ac.cn); Fu, Yuxi(fuyuxi@opt.ac.cn)

Source title:Kexue Tongbao/Chinese Science Bulletin

Abbreviated source title:Kexue Tongbao/Chin. Sc. Bull.

Volume:66

Issue:8

Issue date:March 15, 2021

Publication year:2021

Pages:878-888

Language:Chinese

ISSN:0023074X

E-ISSN:20959419

Document type:Journal article (JA)

Publisher:Chinese Academy of Sciences

Abstract:Attosecond light source is a new type of light source that was born at the beginning of the 21st century, which has a short pulse, broad spectrum, high temporal and spatial coherence and wide tunability, thus being widely employed in various research fieds. From ultrafast motion of electrons in atoms to charge transfer in biological macromolecules, attosecond pulses is currently the only tool that can track and capture these ultrafast dynamics. Attosecond pulse enables us to investigate ultrafast dynamics of micro-world both in nanometer and attosecond scales. However, the mechanism of attosecond pulse generation is completely different from general ultrafast lasers. Instead, attosecond pulse is generated by a highly nonlinear interaction between strong ultrafast femtosecond laser and matter, which is called high-order harmonic generation (HHG). The mechanism of HHG can be understood by a classical three step model. First, an electron is ionized from an atom by a strong laser electric field through tunnel ionization. Then the free electron is accelerated by the laser field and gains energy. Finally, the electron recombines with the parent ion when the laser field changes its sign with emission of a photon, whose energy equals its kinetic energy gained in the laser field plus ionization potential of the atom. Apparently, HHG is strongly affected by the laser waveform. Several key parameters of driving laser, such as wavelength, intensity, and carrier envelope phase strongly affect the process of HHG. Thus, the characteristics of attosecond pulses are determined by the driving laser. The rapid development of attosecond pulse technology strongly depends on the development of driving laser technology. In the beginning, chirped pulse amplification (CPA) technology greatly promoted the development of attosecond light sources. The femtosecond CPA systems based on Ti: sapphire crystal has been the main driving laser to generate attosecond light pulses. The driving laser wavelength is in the near infrared region near 800 nm, which generally has a pulse duration of multiple optical cycles. By employing post-compression technology to shorten pulse durations of CPA systems to few-cycle, isolated attosecond pulses in the extreme ultraviolet (XUV) can be generated, which is called the first generation of attosecond light source. Recently, optical parametric amplification (OPA) systems have been widely used as driving laser due to its flexible wavelength tunability. Using OPA, longer driving laser wavelength up to the midinfrared (MIR) can be obtained, which pushes the attosecond pulses to the soft X-ray region, and has been called the second generation of attosecond light sources. Due to broad spectrum and higher photon energy, attosecond pulses have a shorter duration in the soft X-ray region compared with XUV region, given that the temporal chirp is properly compensated. In 2017, reseachers generated soft X-ray isolated attosecond pulses, which was driven by mid-infrared pulses centered at 1.8 µm. These attosecond pulses, whose duration reaches 53 as and spectrum surpasses carbon K-edge, provide a tool for studying the ultrafast dynamics of diamond, graphene and other carbon materials. In this paper, we start with the principle of attosecond pulses generation based on HHG. Then, we introduce different technologies and their development for obtaining driving laser pulses for HHG. Finally, we introduce prospect on development of driving laser pulses for attosecond pulses generation.<br/> © 2021, Science Press. All right reserved.

Number of references:80

Main heading:Electrons

Controlled terms:Atoms - Kinetic energy - Kinetics - Electromagnetic pulse - Multiphoton processes - Optical parametric amplifiers - Photoionization - Electric fields - Nonlinear optics - Charge transfer - Atom lasers - Parametric amplifiers - Infrared devices - Ultrashort pulses - Ionization potential - Sapphire

Uncontrolled terms:Attosecond light pulse - Attosecond pulse generation - Biological macromolecule - Carrier-envelope phase - Chirped pulse amplifications - High order harmonic generation - Isolated attosecond pulse - Optical parametric amplification

Classification code:482.2.1 Gems - 631.1 Fluid Flow, General - 701 Electricity and Magnetism - 701.1 Electricity: Basic Concepts and Phenomena - 713.1 Amplifiers - 714 Electronic Components and Tubes - 741.1.1 Nonlinear Optics - 744.1 Lasers, General - 801.4 Physical Chemistry - 802.2 Chemical Reactions - 931 Classical Physics; Quantum Theory; Relativity - 931.3 Atomic and Molecular Physics

Numerical data indexing:Size 8.00e-07m

DOI:10.1360/TB-2020-0594

Database:Compendex

Accession number:20211910318384

Title:Modeling of high-speed laser photography system for field projectile testing

Authors:Sun, Ce (1); Jia, Yangyu (2); Wang, Danni (3)

Author affiliation:(1) Laboratory of Precision Physical Quantity Measurement, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) Xi'an Modern Control Technology Research Institute, Xi'an; Shaanxi; 710065, China; (3) Changchun University of Science and Technology, China

Corresponding author:Sun, Ce(sunce@opt.ac.cn)

Source title:Optik

Abbreviated source title:Optik

Volume:241

Issue date:September 2021

Publication year:2021

Article number:166980

Language:English

ISSN:00304026

Document type:Journal article (JA)

Publisher:Elsevier GmbH

Abstract:<div data-language="eng" data-ev-field="abstract">Field projectile testing plays a crucial role in national defense. Laser high-speed photography records transient processes with high temporal and spatial resolution and is an effective diagnostic method for range testing. In this study, a laser high-speed photography model is established from detailed aspects, including laser pulse energy for reflective imaging, accurate synchronization of pulse train and shutter signal, minimum exposure time and shooting frequency for targets with different velocities, and magnification correction used in the image measurement. Shooting experiments conducted in Nanshan Test center verify the correctness of the theoretical analysis and parameter selection. The models and methods described in this article can be a guidance for field testing.<br/></div> © 2021 Elsevier GmbH

Number of references:17

Main heading:High speed photography

Controlled terms:Projectiles

Uncontrolled terms:Field testing - High spatial resolution - High speed laser - High temporal resolution - Highspeed photography - Illumination energy - Laser high-speed photography - Magnification correction - National defence - Transient process

Classification code:742.1 Photography

DOI:10.1016/j.ijleo.2021.166980

Funding details: Number: 2020JQ-438, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;

Funding text:This wok was supported by the Natural Science Basic Research Program of Shaanxi Province (No. 2020JQ-438 ).

Database:Compendex

Accession number:20210509874589

Title:Testing of annular hyperboloid mirror for Cassegrain system

Authors:Hao, Sanfeng (1, 2); Zhang, Jian (2, 3); An, Fei (2); Yang, Jianfeng (2)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Science, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) School of Mechanoelectronic Engineering, Xidian University, Xi'an; 710071, China

Corresponding author:Zhang, Jian(zj@opt.ac.cn)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11761

Part number:1 of 1

Issue title:Fourth International Conference on Photonics and Optical Engineering

Issue date:2021

Publication year:2021

Article number:117611Z

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510643574

Document type:Conference article (CA)

Conference name:4th International Conference on Photonics and Optical Engineering

Conference date:October 15, 2020 - October 16, 2020

Conference location:Xi'an, China

Conference code:166676

Publisher:SPIE

Abstract:This paper introduces the testing of annular hyperboloid mirror with 460mm diameter in the Cassegrain system. To improve the testing efficiency and meet the requirements of utilization, the study is carried out from three stages: precision grinding, precision polishing, and optical coating. In the precision grinding stage, the annular Zernike polynomial is used to fit the measured surface combining with the data measured from the coordinate measuring machine, so that it can facilitate the testing of the distribution of the surface shape deviation over the entire surface. During the precision polishing stage, a feasible Offner compensator is designed to achieve the goal of high-precision testing of the hyperboloid surface, with a measurement accuracy of RMS≤0.02λ. Also, 0.5-0.7μm and 3-5μm dual-band high reflectivity and high uniformity reflective coating is designed for the Cassegrain system requirements, the actual test reflectivity is 96.2%, which can meet the design requirements.<br/> © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

Number of references:15

Main heading:Mirrors

Controlled terms:Grinding (machining) - Aspherics - Optical testing - Polishing - Optical coatings - Reflective coatings - Reflection

Uncontrolled terms:High reflectivity - Hyperboloid mirrors - Measurement accuracy - Precision grinding - Precision polishing - System requirements - Testing efficiency - Zernike polynomials

Classification code:604.2 Machining Operations - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 813.2 Coating Materials

Numerical data indexing:Percentage 9.62e+01%, Size 3.00e-06m to 5.00e-06m, Size 4.60e-01m, Size 5.00e-07m to 7.00e-07m

DOI:10.1117/12.2585089

Funding details: Number: 2018ZDXM-GY-105, Acronym: -, Sponsor: Key Research and Development Program of Hunan Province of China;

Funding text:This work is funded by the CAS "Light of West China" Program (Grant No. XAB2016A10), key program of research and development of Shanxi Province of China (Grant No. 2018ZDXM-GY-105).

Database:Compendex

Accession number:20213110707126

Title:Design of Spatial Resolution PDV Probe Based on Double Telecentric Lens

Title of translation:基于双远心镜头的空间分辨PDV探头研制

Authors:Yang, Jun (1, 2, 3); Yan, Yadong (1); Li, Qi (1); Shi, Guokai (3); Wang, Zhao (3); Zhang, Yang (3); Zhang, Suoqi (3); He, Junhua (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Laboratory of Intense Dynamic Loading and Effect, Xi'an; 710024, China

Source title:Guangzi Xuebao/Acta Photonica Sinica

Abbreviated source title:Guangzi Xuebao

Volume:50

Issue:7

Issue date:July 25, 2021

Publication year:2021

Article number:0712002

Language:Chinese

ISSN:10044213

CODEN:GUXUED

Document type:Journal article (JA)

Publisher:Chinese Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">In order to simultaneously measure the multi-point velocity of a plane target in the range of 5 mm in material dynamics experiments or structural response research, a laser transmitting and receiving probe with spatial resolution for photonic Doppler velocimetry is developed based on the dense fiber array and double telecentric lens. The optical design and structural design are described, and the installation and testing of the probe are performed. The test results of output spot characteristics show that the vertical axis magnification of the probe is consistent with the design value. The minimum diameter of the spot at the focusing position is 109 μm and the maximum is 202 μm. The test results of the receiving efficiency of the probe to the diffuse reflection target show that each fiber in the probe is not crosstalk, and the receiving efficiency of the fiber near the center is large, while that of the two sides is small.<br/></div> © 2021, Science Press. All right reserved.

Number of references:20

Main heading:Velocity measurement

Controlled terms:Doppler effect - Efficiency - Image resolution - Probes - Optical design

Uncontrolled terms:Design value - Diffuse reflection targets - Minimum diameters - Multi-point velocity - Photonic doppler velocimetry - Spatial resolution - Structural response - Vertical axis

Classification code:741.1 Light/Optics - 913.1 Production Engineering - 943.3 Special Purpose Instruments

Numerical data indexing:Size 1.09e-04m, Size 2.02e-04m, Size 5.00e-03m

DOI:10.3788/gzxb20215007.0712002

Funding details: Number: 2017YFA0403300, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Funding text:National Key Research and Development Program of China (No. 2017YFA0403300)

Database:Compendex

Accession number:20213410799009

Title:Broad-band phase retrieval method for transient radial shearing interference using chirp Z transform technique

Authors:Xue, Fang (1, 2); Duan, Ya-Xuan (1); Chen, Xiao-Yi (1, 2); Li, Ming (1, 2); Yuan, Suo-Chao (1, 2); Da, Zheng-Shang (1)

Author affiliation:(1) Advanced Optical Instrument Research Department, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Duan, Ya-Xuan(duanyaxuan@opt.ac.cn)

Source title:Chinese Physics B

Abbreviated source title:Chin. Phys.

Volume:30

Issue:8

Issue date:July 2021

Publication year:2021

Article number:084209

Language:English

ISSN:16741056

E-ISSN:20583834

Document type:Journal article (JA)

Publisher:IOP Publishing Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">The transient radial shearing interferometry technique based on fast Fourier transform (FFT) provides a means for the measurement of the wavefront phase of transient light field. However, which factors affect the spatial bandwidth of the wavefront phase measurement of this technology and how to achieve high-precision measurement of the broad-band transient wavefront phase are problems that need to be studied further. To this end, a theoretical model of phase-retrieved bandwidth of radial shearing interferometry is established in this paper. The influence of the spatial carrier frequency and the calculation window on phase-retrieved bandwidth is analyzed, and the optimal carrier frequency and calculation window are obtained. On this basis, a broad-band transient radial shearing interference phase-retrieval method based on chirp Z transform (CZT) is proposed, and the corresponding algorithm is given. Through theoretical simulation, a known phase is used to generate the interferogram and it is retrieved by the traditional method and the proposed method respectively. The residual wavefront RMS of the traditional method is 0.146λ, and it is 0.037λ for the proposed method, which manifests an improvement of accuracy by an order of magnitude. At the same time, different levels of signal-to-noise ratios (SNRs) from 50 dB to 10 dB of the interferogram are simulated, and the RMS of the residual wavefront is from 0.040λ to 0.066λ. In terms of experiments, an experimental verification device based on a phase-only spatial light modulator is built, and the known phase on the modulator is retrieved from the actual interferogram. The RMS of the residual wavefront retrieved through FFT is 0.112λ, and it decreases to 0.035λ through CZT. The experimental results verify the effectiveness of the method proposed in this paper. Furthermore, the method can be used in other types of spatial carrier frequency interference, such as lateral shearing interference, rotational shearing interference, flipping shearing interference, and four-wave shearing interference.<br/></div> © 2021 Chinese Physical Society and IOP Publishing Ltd.

Number of references:22

Main heading:Wavefronts

Controlled terms:Fast Fourier transforms - Z transforms - Shearing - Interferometry - Bandwidth - Light modulators - Phase measurement - Signal to noise ratio

Uncontrolled terms:Chirp Z transform - Experimental verification - High-precision measurement - Lateral shearings - Shearing interference - Spatial light modulators - Theoretical modeling - Theoretical simulation

Classification code:604.1 Metal Cutting - 716.1 Information Theory and Signal Processing - 921.3 Mathematical Transformations - 941.4 Optical Variables Measurements - 942.2 Electric Variables Measurements

Numerical data indexing:Decibel 5.00e+01dB to 1.00e+01dB

DOI:10.1088/1674-1056/abff2f

Database:Compendex

Accession number:20211010037996

Title:Fabrication and experimental characterization of precise high-efficiency 2D multi-mode fiber array coupler

Authors:Zhou, Xiaojun (1); Song, Aiguo (1); Kong, Depeng (2); Yu, Weixing (2)

Author affiliation:(1) School of Instrument Science and Engineering, Southeast University, Nanjing; 210000, China; (2) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; Shanxi Province; 710119, China

Corresponding author:Song, Aiguo(a.g.song@seu.edu.cn)

Source title:Optical Fiber Technology

Abbreviated source title:Opt. Fiber Technol.

Volume:63

Issue date:May 2021

Publication year:2021

Article number:102488

Language:English

ISSN:10685200

CODEN:OFTEFV

Document type:Journal article (JA)

Publisher:Academic Press Inc.

Abstract:In this paper a method for fabricating precise high-efficiency 2D multi-mode fiber array coupler is proposed, and the coupler's performance is experimentally characterized. By improving the design of 2D fiber array coupler, the average concentricity error of the fiber array is down to 0.9 μm. After coupling with microlens array, the average coupling efficiency of the coupler is up to 57.51%. It is demonstrated that the precise microhole position and fiber cladding diameter, supported by microlens array, can provide an excellent coupling performance. This 2D fiber array coupler can be widely applied in LIDAR, optical communication systems and microwave photonics systems, provide the functions of high-speed image capture, interconnection and optical signals time-space transformation.<br/> © 2021 Elsevier Inc.

Number of references:14

Main heading:Efficiency

Controlled terms:Fibers - Microlenses - Optical radar - Optical instrument lenses - Fabrication

Uncontrolled terms:Coupling efficiency - Coupling performance - Experimental characterization - Fiber claddings - High speed image - High-efficiency - Micro-lens arrays - Microwave Photonics

Classification code:716.2 Radar Systems and Equipment - 741.3 Optical Devices and Systems - 913.1 Production Engineering

Numerical data indexing:Percentage 5.75e+01%, Size 9.00e-07m

DOI:10.1016/j.yofte.2021.102488

Funding details: Number: 2018YFB0504503, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Funding text:This research has been supported by the China National Key Research and Development Project (Grant No. 2018YFB0504503 ).

Database:Compendex

Accession number:20210609884046

Title:Panoramic video motion small target detection algorithm in complex background

Title of translation:复杂背景下全景视频运动小目标检测算法

Authors:Wang, Dian-Wei (1); Yang, Xu (1); Han, Peng-Fei (2); Liu, Ying (1); Xie, Yong-Jun (3); Song, Hai-Jun (3)

Author affiliation:(1) School of Telecommunication and Information Engineering, Xi'an University of Posts and Telecommunications, Xi'an; 710121, China; (2) Center for AI Research and Innovation, Westlake University, Hangzhou; 310024, China; (3) Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China

Corresponding author:Yang, Xu(735583415@qq.com)

Source title:Kongzhi yu Juece/Control and Decision

Abbreviated source title:Kongzhi yu Juece Control Decis

Volume:36

Issue:1

Issue date:January 2021

Publication year:2021

Pages:249-256

Language:Chinese

ISSN:10010920

CODEN:KYJUEF

Document type:Journal article (JA)

Publisher:Northeast University

Abstract:In order to solve the problem of low detection accuracy of moving small targets in the panoramic video in complex background, a small target detection algorithm based on complex background motion is proposed. Firstly, to reduce the interference of complex background information and improve the accuracy of target detection, the fast robust principal component analysis (Fast RPCA) algorithm is used to separate the foreground background information of the panoramic video image, and the foreground information is extracted as an effective image feature. Then, the candidate frame size of the region proposal network (RPN) in the faster region-convolutional neural networks (Faster R-CNN) is improved to adapt to the target size in the panoramic image, and then the foreground feature map is trained. Finally, the convolutional layer output detection model is shared by the RPN network and the Fast R-CNN network to achieve accurate detection of small targets in the panoramic video image. Experiments show that the proposed algorithm can effectively suppress the influence of complex background information on target detection accuracy, and has high detection accuracy for small moving targets in panoramic video images.<br/> Copyright ©2021 Control and Decision.

Number of references:19

Main heading:Convolutional neural networks

Controlled terms:Convolution - Principal component analysis - Multilayer neural networks - Image enhancement - Complex networks

Uncontrolled terms:Background information - Complex background - Detection accuracy - Foreground features - Foreground information - Robust principal component analysis - Small moving target - Small target detection

Classification code:716.1 Information Theory and Signal Processing - 722 Computer Systems and Equipment - 922.2 Mathematical Statistics

DOI:10.13195/j.kzyjc.2019.0686

Database:Compendex

Accession number:20213610853430

Title:Optical design and analysis of compact visible and medium-wave infrared whisking broom imaging system

Title of translation:紧凑中波/可见摆扫成像装置光学设计与分析

Authors:Liu, Bo (1); Liu, Aimin (2); Li, Qiaoling (2); Xie, Laiyun (2)

Author affiliation:(1) College of Aerospace Science and Engineering, National University of Defense Technology, Changsha; 410003, China; (2) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China

Corresponding author:Liu, Aimin(liuaimin1232003@163.com)

Source title:Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering

Abbreviated source title:Hongwai yu Jiguang Gongcheng Infrared Laser Eng.

Volume:50

Issue:8

Issue date:August 25, 2021

Publication year:2021

Article number:20200517

Language:Chinese

ISSN:10072276

Document type:Journal article (JA)

Publisher:Chinese Society of Astronautics

Abstract:<div data-language="eng" data-ev-field="abstract">To accomplish long-range visible and medium-wave infrared whisking broom imaging detection under strict space limitation, dual-band catadioptric shrink-beam system, double fast steering mirrors, and subsequet compact single-wave lenses was used to build a compact dual-band whisking broom imaging system through lens system design optimization. Among them, dual-band catadioptric shrink-beam system was composed of two-mirror Ritchey Chretien system, CaF<inf>2</inf> dichroic prism and subsequet single-wave lenses. The image quality of the shrink-beam system was closed to diffraction limit in the 0.6-0.9 μm and 3.6-4.9 μm wave bands. Image motion of the dual-band shrink-beam system were controlled within halves of the respective pixels during broom imaging process. The effective focal length of the dual-band catadioptric system in the visible band was 1752 mm, there was no lens in between the RC, the three dimensional size of the optical system was 380 mm (axial)×Φ360, the telephoto ratio was 0.22, the line obscuration ratio was 0.34. Based on simulation and analysis, when the incident angles were larger than 30°, the point source transmittance (PST) of the dual-band system was less than 1×10<sup>−4</sup> without additional front baffles. And this system was designed with mature optical cold working, installation and adjustment process and low cost.<br/></div> © 2021, Editorial Board of Journal of Infrared and Laser Engineering. All right reserved.

Number of references:34

Main heading:Mirrors

Controlled terms:Diffraction - Fluorspar - Optical design - Lenses - Light polarization - Optical systems - Stray light - Incident light - Calcium fluoride

Uncontrolled terms:Design and analysis - Diffraction limits - Effective focal lengths - Fast steering mirror - Imaging detections - Lens system designs - Simulation and analysis - Space limitations

Classification code:482.2 Minerals - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 804.2 Inorganic Compounds

Numerical data indexing:Size 1.75e+00m, Size 3.60e-06m to 4.90e-06m, Size 3.80e-01m, Size 6.00e-07m to 9.00e-07m

DOI:10.3788/IRLA20200517

Funding details: Number: 11404387, Acronym: NNSFC, Sponsor: National Natural Science Foundation of China;

Funding text:The National Natural Science Foundation of China (No. 11404387)

Database:Compendex

Accession number:20202108688424

Title:Fine-Grained Visual Categorization by Localizing Object Parts with Single Image

Authors:Zheng, Xiangtao (1); Qi, Lei (1); Ren, Yutao (2); Lu, Xiaoqiang (1)

Corresponding author:Lu, Xiaoqiang(luxq666666@gmail.com)

Source title:IEEE Transactions on Multimedia

Abbreviated source title:IEEE Trans Multimedia

Volume:23

Issue date:2021

Publication year:2021

Pages:1187-1199

Article number:9091241

Language:English

ISSN:15209210

E-ISSN:19410077

CODEN:ITMUF8

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">Fine-grained visual categorization (FGVC) refers to assigning fine-grained labels to images which belong to the same base category. Due to the high inter-class similarity, it is challenging to distinguish fine-grained images under different subcategories. Recently, researchers have proposed to firstly localize key object parts within images and then find discriminative clues on object parts. To localize object parts, existing methods train detectors for different kinds of object parts. However, due to the fact that the same kind of object part in different images often changes intensely in appearance, the existing methods face two shortages: 1) Training part detector for object parts with diverse appearance is laborious; 2) Discriminative parts with unusual appearance may be neglected by the trained part detectors. To localize the key object parts efficiently and accurately, a novel FGVC method is proposed in the paper. The main novelty is that the proposed method localizes the key object parts within each image only depending on a single image and hence avoid the influence of diversity between parts in different images. The proposed FGVC method consists of two key steps. Firstly, the proposed method localizes the key parts in each image independently. To this end, potential object parts in each image are identified and then these potential parts are merged to generate the final representative object parts. Secondly, two kinds of features are extracted for simultaneously describing the discriminative clues within each part and the relationship between object parts. In addition, a part based dropout learning technique is adopted to boost the classification performance further in the paper. The proposed method is evaluated in comparison experiments and the experiment results show that the proposed method can achieve comparable or better performance than state-of-the-art methods.<br/></div> © 1999-2012 IEEE.

Number of references:56

Main heading:Clustering algorithms

Controlled terms:Learning systems - Object detection

Uncontrolled terms:Classification performance - Fine grained - Inter class - Learning techniques - Representative object - Single images - State-of-the-art methods - Visual categorization

Classification code:723.2 Data Processing and Image Processing - 903.1 Information Sources and Analysis

DOI:10.1109/TMM.2020.2993960

Funding details: Number: QYZDY-SSW-JSC044, Acronym: -, Sponsor: -;Number: 61702498,61772510,61806193, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: QYZDB-SSW-JSC015,XAB2017B15,XAB2017B26, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2017YFB0502900, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;Number: 61925112, Acronym: -, Sponsor: National Science Fund for Distinguished Young Scholars;

Funding text:Manuscript received September 12, 2019; revised February 18, 2020 and April 21, 2020; accepted April 30, 2020. Date of publication May 11, 2020; date of current version April 23, 2021. This work was supported in part by the National Natural Science Found for Distinguished Young Scholars under Grant 61925112, in part by the National Key R&D Program of China under Grant 2017YFB0502900, in part by the National Natural Science Foundation of China under Grants 61806193, 61702498, and 61772510, in part by the Young Top-Notch Talent Program of Chinese Academy of Sciences under Grant QYZDB-SSW-JSC015, in part by the CAS "Light of West China" Program under Grants XAB2017B26 and XAB2017B15, and in part by the Key Research Program of Frontier Sciences, Chinese Academy of Sciences under Grant QYZDY-SSW-JSC044. The associate editor coordinating the review of this manuscript and approving it for publication was Prof. Sebastian Knorr. (Corresponding author: Xiaoqiang Lu.) Xiangtao Zheng, Lei Qi, and Xiaoqiang Lu are with the Key Laboratory of Spectral Imaging Technology CAS, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China (e-mail: xiangtaoz@gmail.com; 553054612@qq.com; luxq666666@gmail.com).

Database:Compendex

Accession number:20220911713503

Title:Design Method for Initial Structure of Freeform Surface Optical System

Title of translation:一种自由曲面光学系统初始结构设计方法

Authors:Luo, Yue (1, 2); Li, Libo (1); Feng, Yutao (1); Zhao, Hengxiang (1); Li, Xijie (1); Bai, Qinglan (1)

Author affiliation:(1) Key Laboratory of Spectral Imaging Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Feng, Yutao(fytciom@126.com)

Source title:Guangxue Xuebao/Acta Optica Sinica

Abbreviated source title:Guangxue Xuebao

Volume:41

Issue:24

Issue date:December 25, 2021

Publication year:2021

Article number:2422002

Language:Chinese

ISSN:02532239

CODEN:GUXUDC

Document type:Journal article (JA)

Publisher:Chinese Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">A direct construction method for freeform surface optical system is proposed to address the problem that the initial structure is difficult to obtain in the design of such system. With the ideal object-image relationship and the Fermat principle as the criteria of single module iteration, an initial structure with favorable optimization potential can be directly obtained from a plane optical system without optical power by tracing light rays point by point. It can be solved faster by sampling feature light rays with different densities at different iteration stages. After the initial optical structure is obtained, optical design software can be used to further optimize the image quality. A compact off-axis two-mirror optical system with a 150 mm focal length and a physical size less than 40 mm×70 mm×60 mm is designed by the proposed method, which verifies the feasibility of this method in the design of freeform surface optical systems.<br/></div> © 2021, Chinese Lasers Press. All right reserved.

Number of references:19

Main heading:Optical design

Controlled terms:Structural optimization - Geometrical optics - Iterative methods - Light - Optical systems - Mirrors

Uncontrolled terms:Design method - Free-form surface - Initial structures - Light rays - Mirror systems - Off-axis - Off-axis two-mirror system - Optical freeform surfaces - Surface optical - Two mirrors

Classification code:741.1 Light/Optics - 741.3 Optical Devices and Systems - 921.5 Optimization Techniques - 921.6 Numerical Methods

Numerical data indexing:Size 1.50E-01m, Size 4.00E-02m, Size 6.00E-02m, Size 7.00E-02m

DOI:10.3788/AOS202141.2422002

Database:Compendex

Accession number:20212610557854

Title:Multichannel left-subtract-right feature vector piston error detection method based on a convolutional neural network (Open Access)

Authors:WANG, PENG-FEI (1, 2); ZHAO, HUI (1); XIE, XIAO-PENG (1); ZHANG, YA-TING (1, 2); LI, CHUANG (1); FAN, XUE-WU (1)

Author affiliation:(1) Space Optical Technology Research Department, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:ZHAO, HUI(zhaohui@opt.ac.cn)

Source title:Optics Express

Abbreviated source title:Opt. Express

Volume:29

Issue:14

Issue date:July 5, 2021

Publication year:2021

Pages:21320-21335

Language:English

E-ISSN:10944087

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">To realize the large-scale and high-precision co-phasing adjustment of syntheticaperture telescopes, we propose a multichannel left-subtract-right feature vector piston error detection method based on a convolutional neural network, which inherits the high precision and strong noise resistance of the DFA-LSR method while achieving a detection range of (-139λ, 139λ) (λ = 720 nm). In addition, a scheme to build large training datasets was proposed to solve the difficulty in collecting datasets using traditional neural network methods. Finally, simulations verified that this method can guarantee at least 94.96% accuracy with large samples, obtaining a root mean square error of 10.2 nm when the signal-to-noise ratio is 15.<br/></div> © 2021 Optical Society of America.

Number of references:25

Main heading:Error detection

Controlled terms:Convolution - Pistons - Feature extraction - Large dataset - Signal to noise ratio - Least squares approximations - Mean square error - Convolutional neural networks

Uncontrolled terms:Detection methods - Detection range - Feature vectors - High-precision - Neural network method - Noise resistance - Root mean square errors - Training data sets

Classification code:612.1.1 Internal Combustion Engine Components - 716.1 Information Theory and Signal Processing - 723.2 Data Processing and Image Processing - 921.6 Numerical Methods - 922.2 Mathematical Statistics

Numerical data indexing:Percentage 9.50e+01%, Size 1.02e-08m, Size 7.20e-07m

DOI:10.1364/OE.428690

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20221712022157

Title:Simulation and analysis of the coherent-dispersion spectrometer for exoplanet detection

Authors:Wu, Yinhua (1); Chen, Shasha (2, 3); Wang, Pengchong (2, 3); Zhou, Shun (1); Feng, Yutao (2, 3); Zhang, Weiguang (1); Wei, Ruyi (2, 3)

Author affiliation:(1) School of Optoelectronics Engineering, Xi'an Technological University, Xuefu Middle Road, Xi'an; 710021, China; (2) Key Laboratory of Spectral Imaging Technology, Chinese Academy of Sciences, Xinxi Road, Xi'an; 710119, China; (3) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xinxi Road, Xi'an; 710119, China

Corresponding authors:Wu, Yinhua(yinhuawoo@163.com); Wei, Ruyi(weiry_xaopt@126.com)

Source title:Monthly Notices of the Royal Astronomical Society

Abbreviated source title:Mon. Not. R. Astron. Soc.

Volume:503

Issue:2

Issue date:May 1, 2021

Publication year:2021

Pages:3032-3043

Language:English

ISSN:00358711

E-ISSN:13652966

CODEN:MNRAA4

Document type:Journal article (JA)

Publisher:Oxford University Press

Abstract:<div data-language="eng" data-ev-field="abstract">The coherent-dispersion spectrometer (CODES) is a new exoplanet detection instrument using the radial velocity (RV) method. This attempts mainly to improve environmental sensitivity and energy utilization by using an asymmetric, common-path Sagnac interferometer instead of a traditional Michelson interferometer. In order to verify its feasibility and to choose the appropriate key parameters to obtain the optimal performance, research on data processing for the design stage of the CODES is performed by systematic simulation and analysis. First, the instrument modelling is carried out for further data analysis according to the principle of the CODES, and the reliability of the model is verified by experiments. Second, the influence of key parameters on fringe visibility is analysed systematically, which provides a certain reference for the choice of the key parameters. Third, the RV inversion method for the CODES is proposed and optimized according to the related analysis results so as to promote RV inversion precision. Finally, the recommended values for the key parameters of the CODES are given. The experimental results show that the data processing error of RV inversion is less than 0.6 m s<sup>-1</sup> within the recommended range of key parameters. This indicates that the scheme of the CODES is reasonable and feasible, and that the proposed data processing method is effective and well matched with the instrument design.<br/></div> © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Number of references:28

Main heading:Energy utilization

Controlled terms:Computer software - Data handling - Dispersions - Extrasolar planets - Information analysis - Michelson interferometers - Reliability analysis - Spectrometers - Visibility

Uncontrolled terms:Dispersion spectrometers - Instrumentation: interferometers - Instrumentation:spectrographs - Keys parameters - Methods. Data analysis - Radial velocity - Simulation and analysis - Software simulation - Techniques: radial velocities - Velocity inversion

Classification code:525.3 Energy Utilization - 657.2 Extraterrestrial Physics and Stellar Phenomena - 723 Computer Software, Data Handling and Applications - 723.2 Data Processing and Image Processing - 741.2 Vision - 741.3 Optical Devices and Systems - 903.1 Information Sources and Analysis - 941.3 Optical Instruments - 951 Materials Science

Numerical data indexing:Velocity 6.00E-01m/s

DOI:10.1093/mnras/stab656

Funding details: Number: LSIT201902W, Acronym: -, Sponsor: -;Number: 11727806,61905275, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2021JQ-640, Acronym: -, Sponsor: Shantou Science and Technology Project;

Funding text:The authors thank the editors and the anonymous reviewers for their constructive and helpful comments. This work was supported by the National Natural Science Foundation of China (61905275, 11727806) and the Open Research Fund of Key Laboratory of Spectral Imaging Technology of the Chinese Academy of Sciences (LSIT201902W). Shaanxi Science and Technology Project (2021JQ-640).

Database:Compendex

Accession number:20215211375378

Title:Pneumonia image classification based on convolutional neural network

Authors:Xiong, Feng (1); He, Di (1); Liu, Yujie (1); Qi, Meijie (1); Zhang, Zhoufeng (2); Liu, Lixin (1, 2)

Author affiliation:(1) School of Physics and Optoelectronic Engineering, Xidian University, Xi'an Shaanxi; 710071, China; (2) CAS Key Laboratory of Spectral Imaging Technology, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an Shaanxi; 710119, China

Corresponding author:Liu, Lixin(lxliu@xidian.edu.cn)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12057

Part number:1 of 1

Issue title:Twelfth International Conference on Information Optics and Photonics, CIOP 2021

Issue date:2021

Publication year:2021

Article number:120573C

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510649897

Document type:Conference article (CA)

Conference name:12th International Conference on Information Optics and Photonics, CIOP 2021

Conference date:July 23, 2021 - July 26, 2021

Conference location:Xi'an, China

Conference code:175384

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">Chest X-ray is the commonly used method to diagnose pneumonia. How to correctly interpret the image information is always the main challenge faced by doctors. Convolution Neural Network (CNN) is a popular deep learning algorithm with excellent image recognition performance, and has been used widely in automatic recognition and diagnosis of medical images. This paper studies the classification of normal and pneumonia with more than 5000 chest X-ray images by employing three CNN models of VGG16, VGG19 and Inception V3. The performances of each model for classification was evaluated and compared.<br/></div> © 2021 COPYRIGHT SPIE.

Number of references:10

Main heading:Image classification

Controlled terms:Computer aided diagnosis - Image recognition - Deep learning - Medical imaging - Learning algorithms - Convolution - Convolutional neural networks

Uncontrolled terms:Automatic diagnosis - Chest X-ray - Convolution neural network - Convolutional neural network - Deep learning - Image information - Images classification - Performance - Pneumonia image

Classification code:461.1 Biomedical Engineering - 461.4 Ergonomics and Human Factors Engineering - 716.1 Information Theory and Signal Processing - 723.2 Data Processing and Image Processing - 723.4.2 Machine Learning - 723.5 Computer Applications - 746 Imaging Techniques

DOI:10.1117/12.2606413

Funding text:This work was partially supported by the National Natural Science Foundation of China (No. 62075177), the Open Research Fund of CAS Key Laboratory of Spectral Imaging Technology (No. LSIT202005W), and the 111 Project (No. B17035).

Database:Compendex

Accession number:20211310140065

Title:Person Reidentification via Unsupervised Cross-View Metric Learning

Authors:Feng, Yachuang (1); Yuan, Yuan (2); Lu, Xiaoqiang (1)

Author affiliation:(1) Key Laboratory of Spectral Imaging Technology Cas, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) Center for Optical Imagery Analysis and Learning, Northwestern Polytechnical University, Xi'an; 710072, China

Corresponding author:Lu, Xiaoqiang(luxq666666@gmail.com)

Source title:IEEE Transactions on Cybernetics

Abbreviated source title:IEEE Trans. Cybern.

Volume:51

Issue:4

Issue date:April 2021

Publication year:2021

Pages:1849-1859

Article number:8694838

Language:English

ISSN:21682267

E-ISSN:21682275

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:Person reidentification (Re-ID) aims to match observations of individuals across multiple nonoverlapping camera views. Recently, metric learning-based methods have played important roles in addressing this task. However, metrics are mostly learned in supervised manners, of which the performance relies heavily on the quantity and quality of manual annotations. Meanwhile, metric learning-based algorithms generally project person features into a common subspace, in which the extracted features are shared by all views. However, it may result in information loss since these algorithms neglect the view-specific features. Besides, they assume person samples of different views are taken from the same distribution. Conversely, these samples are more likely to obey different distributions due to view condition changes. To this end, this paper proposes an unsupervised cross-view metric learning method based on the properties of data distributions. Specifically, person samples in each view are taken from a mixture of two distributions: one models common prosperities among camera views and the other focuses on view-specific properties. Based on this, we introduce a shared mapping to explore the shared features. Meanwhile, we construct view-specific mappings to extract and project view-related features into a common subspace. As a result, samples in the transformed subspace follow the same distribution and are equipped with comprehensive representations. In this paper, these mappings are learned in an unsupervised manner by clustering samples in the projected space. Experimental results on five cross-view datasets validate the effectiveness of the proposed method.<br/> © 2013 IEEE.

Number of references:66

Main heading:Mapping

Controlled terms:Cameras - Learning systems

Uncontrolled terms:Data distribution - Different distributions - Information loss - Manual annotation - Metric learning - Multiple nonoverlapping cameras - Person re identifications - Specific properties

Classification code:405.3 Surveying - 742.2 Photographic Equipment

DOI:10.1109/TCYB.2019.2909480

Funding details: Number: 61632018,61702498,61761130079,61772510, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: QYZDB-SSW-JSC015,QYZDY-SSW-JSC044, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2017YFB0502900,XAB2017B15, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Funding text:Manuscript received August 24, 2018; revised January 27, 2019; accepted March 31, 2019. Date of publication April 22, 2019; date of current version March 17, 2021. This work was supported in part by the National Natural Science Foundation of China under Grant 61702498, Grant 61761130079, and Grant 61772510, in part by the National Key Research and Development Program of China under Grant 2017YFB0502900, in part by the CAS "Light of West China" Program under Grant XAB2017B15, in part by the Key Research Program of Frontier Sciences, CAS under Grant QYZDY-SSW-JSC044, in part by the Young Top-Notch Talent Program of Chinese Academy of Sciences under Grant QYZDB-SSW-JSC015, and in part by the State Key Program of National Natural Science of China under Grant 61632018. This paper was recommended by Associate Editor H. Lu. (Corresponding author: Xiaoqiang Lu.) Y. Feng and X. Lu are with the Key Laboratory of Spectral Imaging Technology CAS, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China (e-mail: luxq666666@gmail.com).

Database:Compendex

Accession number:20220211437002

Title:Numerical study and improvement of the dynamic performance of dilation x-ray imager

Authors:Wang, Qiangqiang (1); Cao, Zhurong (1); Chen, Tao (1); Deng, Bo (1); Deng, Keli (1); Tian, Jinshou (2)

Author affiliation:(1) Research Center of Laser Fusion, Chinese Academy of Engineering Physics, Sichuan, Mianyang; 621900, China; (2) Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Science, Shanxi, Xi'an; 710119, China

Corresponding authors:Wang, Qiangqiang(wqqflying@163.com); Cao, Zhurong(xfc_lfrc@163.com)

Source title:Review of Scientific Instruments

Abbreviated source title:Rev. Sci. Instrum.

Volume:92

Issue:12

Issue date:December 1, 2021

Publication year:2021

Article number:123305

Language:English

ISSN:00346748

E-ISSN:10897623

CODEN:RSINAK

Document type:Journal article (JA)

Publisher:American Institute of Physics Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">We present in this Note a numerical study on the dynamic performance of a Dilation X-ray Imager (DIXI). The DIXI including a photoelectron tube (PT) and a magnetic solenoid is modeled in 3D space. The initial parameters of the photoelectrons are sampled with a Monte Carlo code. The trajectories of the photoelectrons are calculated by using the particle-in-cell method, and the transit time spread (TTS) and temporal magnification are analyzed in detail. We have designed a PT with a double-microstrip structure and compared the performance of the double-microstrip PT with the traditional single-microstrip PT. The results show that the sensitivity of the TTS and the temporal magnification to the emission time of the photoelectrons can be significantly reduced by using the double-microstrip PT, resulting in an improvement of the time window. Therefore, the dynamic performance of the DIXI is improved.<br/></div> © 2021 Author(s).

Number of references:15

Main heading:Photoelectrons

Controlled terms:Photons - Mechanisms - Image enhancement

Uncontrolled terms:3D spaces - Dynamic performance - Initial parameter - Micro-strips - Microstrip structures - Monte Carlo codes - Particle in cell method - Performance - Transit time spread - X-ray imagers

Classification code:601.3 Mechanisms - 711 Electromagnetic Waves - 931.3 Atomic and Molecular Physics

DOI:10.1063/5.0061685

Funding details: Number: 11675157,11805180, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:This research was supported by the Natural Science Fund of China (Grant Nos. 11805180 and 11675157).

Database:Compendex

Accession number:20214811231805

Title:Improving physical parameters estimation in the single-beam multiple-intensity reconstruction

Authors:Chen, Xiaoyi (1, 2); Duan, Yaxuan (1); Da, Zhengshang (1)

Author affiliation:(1) The Advanced Optical Instrument Research Department, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Duan, Yaxuan(duanyaxuan@opt.ac.cn)

Source title:Journal of Optics (United Kingdom)

Abbreviated source title:J. Opt.

Volume:23

Issue:12

Issue date:December 2021

Publication year:2021

Article number:125601

Language:English

ISSN:20408978

E-ISSN:20408986

Document type:Journal article (JA)

Publisher:IOP Publishing Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">The iterative phase retrieval based on phase diversity technologies can solve the stagnation problem of Gerchberg-Saxton algorithm which performs Fourier transform to iterate back and forth between the object and spectral planes with known constraints. However, the application of phase diversity technologies in iterative phase retrieval methods will bring in multiple physical parameters such as distances or wavelengths. The measured accuracy of these physical parameters will ultimately affect the accuracy of the iterative phase retrieval methods. In this paper, a physical parameters estimation method which has the advantages of high global convergence and local convergence is proposed to improve the accuracy of iterative phase retrieval methods. Meanwhile, this method is introduced in the single-beam multiple-intensity reconstruction (SBMIR), termed PE-SBMIR, and its performance is verified by simulations and experiments. By simulating multiple sets of distance parameters with errors, the retrieved accuracy using PE-SBMIR can be improved by 2-4 orders of magnitude compared with SBMIR. Experimental results show that whether it is an amplitude-type object or phase-type object, the accuracy using PE-SBMIR is significantly higher than using SBMIR. The physical parameters estimation method proposed in this paper may be adopted in other iterative phase retrieval methods using phase diversity technologies.<br/></div> © 2021 IOP Publishing Ltd

Number of references:38

Main heading:Parameter estimation

Controlled terms:Information retrieval - Iterative methods

Uncontrolled terms:Iterative phase retrieval - Multiple intensities - Parameter estimation method - Parameters estimation - Phase retrieval - Phase-diversity - Physical parameters - Retrieval methods - Single-beam - Single-beam multiple-intensity reconstruction

Classification code:903.3 Information Retrieval and Use - 921.6 Numerical Methods

DOI:10.1088/2040-8986/ac2ea9

Funding details: Number: 61705254, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2020GY-114, Acronym: -, Sponsor: Shanxi Provincial Key Research and Development Project;

Funding text:The authors gratefully acknowledge the support of National Natural Science Foundation of China (NSFC) (Grant No. 61705254) and Key Research and Development Program of Shaanxi Province, China (Grant No. 2020GY-114).

Database:Compendex

Accession number:20211410162263

Title:Stray light test facility for multispectral spaced-based optical system with large field of view

Authors:Zhao, Qice (1); Xu, Xiping (1); Qiao, Yang (1); Pan, Yue (1); Lu, Yi (1); Xu, Liang (2); Liu, Feng (2)

Author affiliation:(1) College of Optoelectronic Engineering, Changchun University of Science and Technology, Changchun; Jilin; 130022, China; (2) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; Shanxi; 710119, China

Corresponding author:Xu, Xiping(xxp@cust.edu.cn)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11763

Part number:1 of 1

Issue title:Seventh Symposium on Novel Photoelectronic Detection Technology and Applications

Issue date:2021

Publication year:2021

Article number:117639V

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510643611

Document type:Conference article (CA)

Conference name:7th Symposium on Novel Photoelectronic Detection Technology and Applications

Conference date:November 5, 2020 - November 7, 2020

Conference location:Kunming, China

Conference code:167886

Sponsor:Chinese Society for Optical Engineering (CSOE); Science and Technology on Low-light-level Night Vision Laboratory

Publisher:SPIE

Abstract:In order to evaluate the ability of a space-based optical system to suppress off-axis stray light, a large-field, multispectrum space-based stray light test method based on point source transmittance (PST) is proposed in this paper. A stray light test facility is constructed using multiple laser sources, large aperture off-axis reflective parallel light tubes and a high-precision positioning mechanism to evaluate the PST index of stray light in the visible and near infrared bands for a space-based optical system. Based on theoretical analysis, experimental measurements of standard lenses in various wavelength bands have proven that the dynamic range of the facility in the visible light band is 10<sup>-6</sup> and in the infrared band is 10<sup>-3</sup>. The facility has the advantages of wide range of detectable wavelengths, high automation, and large dynamic range. The test results can be used for correction of the hood, which provides a reliable traceability basis for the stray light suppression of a space-based optical system.<br/> © 2021 SPIE

Number of references:14

Main heading:Optical systems

Controlled terms:Test facilities - Infrared devices - Stray light

Uncontrolled terms:High precision positioning - Large field of views - Measurements of - Multiple lasers - Space based optical systems - Stray light suppression - Visible and near infrared - Visible light bands

Classification code:741.1 Light/Optics - 741.3 Optical Devices and Systems

DOI:10.1117/12.2588249

Funding details: Number: 61605016, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:Funding Information. National Science Foundation for Young Scientists of China (Grant No. 61605016);

Database:Compendex

Accession number:20213410810537

Title:High Precision Centroid Location Algorithm Based on Cubic Spline Fitting and Interpolation

Title of translation:基于三次样条拟合插值的高精度质心定位方法

Authors:Liu, Jie (1, 2); Zhang, Geng (1); Feng, Xiangpeng (1); Zhang, Zhinan (1); Li, Siyuan (1); Hu, Bingliang (1)

Source title:Guangxue Xuebao/Acta Optica Sinica

Abbreviated source title:Guangxue Xuebao

Volume:41

Issue:12

Issue date:June 25, 2021

Publication year:2021

Article number:1212004

Language:Chinese

ISSN:02532239

CODEN:GUXUDC

Document type:Journal article (JA)

Publisher:Chinese Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">In this paper, we proposed a high-precision centroid location algorithm based on cubic spline fitting and interpolation combining the advantages of centroid algorithms and surface fitting algorithms. Besides, the principle behind its double error suppression was given. The simulation showed that the location error of the proposed algorithm at different SNRs was significantly smaller than that of traditional centroid algorithms. When the SNR was 20 dB, the root-mean-square error of the proposed algorithm was only 0.003 pixel. Furthermore, the star images from real instruments verified the effectiveness of this algorithm once again. In summary, this algorithm can effectively suppress the location error and has strong noise resistance, which can be widely applied without requiring specific star models.<br/></div> © 2021, Chinese Lasers Press. All right reserved.

Number of references:18

Main heading:Location

Controlled terms:Signal to noise ratio - Errors - Interpolation - Mean square error - Star trackers - Stars

Uncontrolled terms:Centroid algorithm - Error suppression - Fitting algorithms - High-precision - Location algorithms - Location errors - Noise resistance - Root mean square errors

Classification code:657.2 Extraterrestrial Physics and Stellar Phenomena - 716.1 Information Theory and Signal Processing - 741.3 Optical Devices and Systems - 921.6 Numerical Methods - 922.2 Mathematical Statistics

Numerical data indexing:Decibel 2.00e+01dB

DOI:10.3788/AOS202141.1212004

Database:Compendex

Accession number:20220211446977

Title:Research progress and core technologies of optical-mechanical system based on additive manufacturing

Authors:Jia, Xinyin (1, 2); Hu, Bingliang (1); Wang, Feicheng (1); Li, Siyuan (1); Sun, Lijun (1); Wu, Junqiang (1)

Author affiliation:(1) Key Laboratory of Spectral Imaging Technology, Xi'An Institute of Optical Precision Machinery of Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12060

Part number:1 of 1

Issue title:AOPC 2021: Advanced Laser Technology and Applications

Issue date:2021

Publication year:2021

Article number:120601D

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510649958

Document type:Conference article (CA)

Conference name:2021 Applied Optics and Photonics China: Advanced Laser Technology and Applications, AOPC 2021

Conference date:June 20, 2021 - June 22, 2021

Conference location:Beijing, China

Conference code:175856

Sponsor:Chinese Society for Optical Engineering

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">The research on optical-mechanical system based on additive manufacturing is based on additive manufacturing, diamond turning, high-precision magnetorheological polishing, surface modification technology, internal lattice structure topology optimization and so on. It can overcome the problems of adhesive use and material matching in the traditional structure design, greatly reduce the difficulty of assembly and thermal control, and realize the lightweight design of internal structure that can not be realized by traditional processing methods. In addition, because the mirror body and its supporting structure are made of same metal materials and integrated, the strength and stiffness are greatly improved compared with the traditional design method. This paper summarizes the development status and technical parameters of additive manufacturing opto-mechanical system at home and abroad. The research progress of surface modification technology by domestic and foreign scholars was focused and the post-processing process and core technologies of the optical-mechanical system were described.<br/></div> © 2021 SPIE.

Number of references:18

Main heading:Mechanics

Controlled terms:3D printers - Additives - Adhesives - Industrial research - Processing - Structural optimization

Uncontrolled terms:Core technology - Diamond turning - High-precision - Manufacturing IS - Mechanical systems - Optical- - Optical-mechanical system - Surface modification process - Surface modifications technologies - Voronoi cell

Classification code:745.1.1 Printing Equipment - 803 Chemical Agents and Basic Industrial Chemicals - 901.3 Engineering Research - 912.1 Industrial Engineering - 913.4 Manufacturing - 921.5 Optimization Techniques - 931.1 Mechanics

DOI:10.1117/12.2606752

Database:Compendex

Accession number:20211610236305

Title:Corrective method for spectral offset error caused by radial distortion in the large aperture static imaging spectrometer

Title of translation:大孔径静态干涉成像光谱仪径向畸变导致的谱线偏移误差的校正

Authors:An, Ling-Ping (1, 2); Wang, Shuang (1); Zhang, Geng (1); Li, Juan (1); Liu, Xue-Bin (1)

Corresponding author:Wang, Shuang(wangshuang@opt.ac.cn)

Source title:Chinese Optics

Abbreviated source title:Chin. Opt.

Volume:14

Issue:2

Issue date:March 2021

Publication year:2021

Pages:382-389

Language:Chinese

ISSN:20971842

Document type:Journal article (JA)

Publisher:Editorial Office of Chinese Optics

Abstract:<div data-language="eng" data-ev-field="abstract">In order to improve the spectral calibration accuracy of the large aperture static imaging spectrometer when its field of view is increased, and to reduce the influence of radial distortion on its spectral accuracy, we propose a corrective method for spectral calibration coefficients based on a spectral distortion correlation model. To begin the process, the wave number and wavelength correction formulas are given. Using 594.1 nm and 632.8 nm gas lasers, a spectroscopic imaging experiment was performed on the imaging spectrometer, and the data was processed and analyzed. The results show that when there is a barrel distortion of 0.3%, the inversion spectrum at the edge of the field of view shifts approximately 2 nm. After implementing the corrective method of this paper, the line shift is reduced to approximately 0.1 nm. This method only needs to be corrected according to the lens distortion parameters, which simplifies the laboratory spectral calibration process and improves work efficiency. It can also be applied to the orbit parameter correction of spaceborne interference spectral data.<br/></div> Copyright ©2021 Chinese Optics. All rights reserved.

Number of references:20

Main heading:Error correction

Controlled terms:Calibration - Gas lasers - Spectrometers

Uncontrolled terms:Distortion simulation - Errors correction - Field of views - Imaging spectrometers - Large aperture - Large aperture static imaging spectrometer - Offset errors - Radial distortions - Spectral calibration - Static imaging

Classification code:741.3 Optical Devices and Systems - 744.2 Gas Lasers

Numerical data indexing:Percentage 3.00E-01%, Size 1.00E-10m, Size 2.00E-09m, Size 5.941E-07m, Size 6.328E-07m

DOI:10.37188/CO.2020-0084

Funding details: Number: 2018YFB0504900,2018YFB0504901, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Funding text:收稿日期：2020-05-08；修订日期：2020-06-15 基金项目：国家重点研发计划项目（No. 2018YFB0504900，No. 2018YFB0504901） Supported by National Key R&D Program of China (No. 2018YFB0504900, No. 2018YFB0504901)

Database:Compendex

Accession number:20214211026817

Title:Spectral Characteristics of Fiber-Based S-Shape Taper Refractometer with High Sensitivity

Authors:Ma, Jianwen (1); Cheng, Haihao (2); Yang, Xuemei (1); Zhang, Songyang (1); Li, Yongqi (1); Wang, Shun (1); Wu, Shun (1)

Author affiliation:(1) Hubei Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China

Corresponding author:Wu, Shun(wushun@wit.edu.cn)

Source title:IEEE Photonics Technology Letters

Abbreviated source title:IEEE Photonics Technol Lett

Volume:33

Issue:22

Issue date:November 15, 2021

Publication year:2021

Pages:1266-1269

Language:English

ISSN:10411135

E-ISSN:19410174

CODEN:IPTLEL

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">In this work, we have experimentally demonstrated the refractive index (RI) sensing characteristics of a S-shape taper refractometer (STR) based on modal interference theory. Our preliminary theoretical analysis reveals that there exists a critical cladding mode, which is essential for understanding the sensing characteristics. When the dominant cladding mode involved in a core-cladding interference is close to the critical cladding mode, the resulting RI sensitivity tends to reach a maximum value. Moreover, both the critical and the dominant cladding mode are dependent on ambient RI. Our sensor achieves a high RI sensitivity of 2109.7 nm/RIU for a transmission dip at around 1505 nm with a measurement range of 1.36 to 1.39.<br/></div> © 1989-2012 IEEE.

Number of references:24

Main heading:Refractometers

Controlled terms:Refractive index - Cladding (coating)

Uncontrolled terms:Cladding modes - Critical cladding mode - High sensitivity - Multi-mode interference - Refractive index sensing - Refractive index sensitivity - Refractive index sensor - S shape - Sensing characteristics - Spectral characteristics

Classification code:741.1 Light/Optics - 941.3 Optical Instruments

Numerical data indexing:Size 1.505E-06m, Size 2.1097E-06m

DOI:10.1109/LPT.2021.3115955

Funding details: Number: 18QD19,61805182, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:This work was supported by the National Natural Science Foundation of China under Grant 61805182 and Campus Grant 18QD19.

Database:Compendex

Accession number:20212310447580

Title:Non-iterative complex wave-field reconstruction based on Kramers-Kronig relations (Open Access)

Authors:Shen, Cheng (1); Liang, Mingshu (1); Pan, An (2); Yang, Changhuei (1)

Author affiliation:(1) Department of Electrical Engineering, California Institute of Technology, Pasadena; CA; 91125, United States; (2) Xi'an Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences (CAS), Xi'an; 710119, China

Corresponding author:Shen, Cheng(cshen3@caltech.edu)

Source title:Photonics Research

Abbreviated source title:Photon. Res.

Volume:9

Issue:6

Issue date:June 1, 2021

Publication year:2021

Pages:1003-1012

Language:English

ISSN:23279125

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">A non-iterative and non-interferometric computational imaging method to reconstruct a complex wave field called synthetic aperture imaging based on Kramers-Kronig relations (KKSAI) is reported. By collecting images through a modified microscope system with pupil modulation capability, we show that the phase and amplitude profile of the sample at pupil limited resolution can be extracted from as few as two intensity images by using Kramers-Kronig (KK) relations. It is established that as long as each subaperture's edge crosses the pupil center, the collected raw images are mathematically analogous to off-axis holograms. This in turn allows us to adapt a recently reported KK-relations-based phase recovery framework in off-axis holography for use in KKSAI. KKSAI is non-iterative, free of parameter tuning, and applicable to a wider range of samples. Simulation and experiment results have proved that it has much lower computational burden and achieves the best reconstruction quality when compared with two existing phase imaging methods.<br/></div> © 2021 Chinese Laser Press

Number of references:40

Main heading:Iterative methods

Controlled terms:Holograms - Synthetic apertures

Uncontrolled terms:Computational burden - Computational imaging - Limited resolution - Microscope systems - Modulation capability - Off-axis holography - Reconstruction quality - Synthetic aperture imaging

Classification code:716.2 Radar Systems and Equipment - 743 Holography - 921.6 Numerical Methods

DOI:10.1364/PRJ.419886

Database:Compendex

Open Access type(s): All Open Access, Green

Accession number:20220211444610

Title:Design of a catadioptric system for infrared star sensor with wide field of view

Authors:Yan, Haoyu (1); Wang, Hu (2); Xue, Yaoke (2); Ma, Zehua (1)

Author affiliation:(1) Space Optics Technology Lab, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) School of Optoelectronics, University of Chinese Academy of Sciences, Beijing; 100049, China

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12069

Part number:1 of 1

Issue title:AOPC 2021: Novel Technologies and Instruments for Astronomical Multi-Band Observations

Issue date:2021

Publication year:2021

Article number:1206917

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510650138

Document type:Conference article (CA)

Conference name:2021 Applied Optics and Photonics China: Novel Technologies and Instruments for Astronomical Multi-Band Observations, AOPC 2021

Conference date:June 20, 2021 - June 22, 2021

Conference location:Beijing, China

Conference code:175885

Sponsor:Chinese Society for Optical Engineering

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">To achieve precise applications under specific environmental requirements, an infrared optical system that can be applied to near-infrared wavelengths was designed. First of all,based on the selected parameters 1/4-The initial structure was selected and the form of the Maxutov telescope was selected and improved.Then 1/4-The detection performance of the design results was analyzed.Due to the large range of high and low temperature changes in the outer space environment, the system lens barrel material analysis was carried out to obtain the influence of temperature changes on the energy distribution of the optical system.Finally 1/4-A tolerance analysis and optimization of the designed system were conducted so that it could meet the needs of processing and assembly.The design and analysis results indicate that the optical system adopts a spherical catadioptric mirror surface, the total length of the system is 126.218mm, the full field of view for a 14 μm surrounding energy distribution is > 80%, the maximum magnification chromatic aberration value of monochromatic light with a center wavelength of 1.3μm is < 4μm, the maximum absolute distortion is < 4μm in 0.8 field of view.The system has a large field of view 1/4-Aperture 1/4-And relative aperture. It is compact and of suitable size 1/4-easy to install 1/4-And offers high detection performance 1/4-high detection sensitivity 1/4-And a wide detection range.The optical system is useful for the accurate detection of high-precision target detection in a wide spectrum covering the near-infrared band of 0.9&sim;1.7μm.<br/></div> © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

Number of references:5

Main heading:Optical systems

Controlled terms:Optical design - Stars - Infrared devices - Fits and tolerances - Aberrations - Temperature - Lenses

Uncontrolled terms:Catadioptrics - Detection performance - Energy distributions - Field of views - Infrared optical systems - Infrared: star - Lower air pressure - Star sensors - Temperature changes - Wide spectrum

Classification code:641.1 Thermodynamics - 657.2 Extraterrestrial Physics and Stellar Phenomena - 741.1 Light/Optics - 741.3 Optical Devices and Systems

Numerical data indexing:Electric current 4.00E+00A, Percentage 8.00E+01%, Size 1.26218E-01m, Size 1.30E-06m, Size 1.40E-05m, Size 1.70E-06m, Size 4.00E-06m

DOI:10.1117/12.2606881

Database:Compendex

Accession number:20213910942014

Title:Design and Experiment of Raman Laser System for Atom Interferometric Measurement

Title of translation:用于原子干涉测量的Raman光系统设计与实验

Authors:Wang, Xianhua (1); Jia, Sen (1); Li, Junqiang (1, 2)

Author affiliation:(1) Optical Direction and Pointing Technique Research Department, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Science, Xi'an; 710119, China; (2) School of Physics and Information Technology, Shaanxi Normal University, Xi'an; 710119, China

Corresponding author:Wang, Xianhua(xhwang@opt.ac.cn)

Source title:Guangzi Xuebao/Acta Photonica Sinica

Abbreviated source title:Guangzi Xuebao

Volume:50

Issue:9

Issue date:September 25, 2021

Publication year:2021

Pages:143-151

Language:Chinese

ISSN:10044213

CODEN:GUXUED

Document type:Journal article (JA)

Publisher:Chinese Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">Based on optical phase-locked loop technology, a Raman laser system including three lasers, reference, master and slave lasers, is studied. Among which, the reference laser was firstly frequency-locked by modulated transfer spectrum technology and then as a standard frequency; the master laser, which has a frequency difference of 1 GHz relative to the reference laser, was red detuned from excited stated to prevent direct interaction between lasers and atoms; the salve laser, having a frequency difference of 6.8 GHz relative to the master laser, was used to excite the transmission between the hyperfine energy levels of ground state <sup>87</sup>Rb atoms. Respectively, the master and slave lasers were locked by two sets of optical phase-locked loop. The measurement results reveal that the phase noises of the two sets of optical phase-locked loop are within the range of 100 Hz to 1 MHz and lower than -70 dBc/Hz and -65 dBc/Hz respectively, and accordingly, the influence of phase noise on atom interferometric gravity measurement is as low as 5.3×10<sup>-7</sup> per shot. The master and slave lasers are amplified by two separate taped-amplifiers to ensure that the master laser's power is half to that of the slave laser; the composition, polarization unification, and frequency modulation of both the master and slave lasers are realized by the combination laser transmission in fiber and free space. As a result, the Raman laser with a total power of 180 mW is realized, and the maximum fluctuation of total power less than 5% is achieved in long-term power measurement depended not on any additional power stabilizer, satisfying the experimental requirement of atom interferometry measurement.<br/></div> © 2021, Science Press. All right reserved.

Number of references:17

Main heading:Atoms

Controlled terms:Locks (fasteners) - Excited states - Fiber amplifiers - Interferometry - Ground state - Laser mode locking - Phase noise - Atom lasers

Uncontrolled terms:Atom interferomitric measurement - Frequency differences - Laser systems - Master lasers - Optical phase locked loops - Phase-noise - Raman laser pulse - Raman lasers - Slave laser - Stimulated Raman transitions

Classification code:701.2 Magnetism: Basic Concepts and Phenomena - 744.1 Lasers, General - 744.4 Solid State Lasers - 931.3 Atomic and Molecular Physics - 931.4 Quantum Theory; Quantum Mechanics - 941.4 Optical Variables Measurements

Numerical data indexing:Frequency 1.00E+02Hz to 1.00E+06Hz, Frequency 1.00E+09Hz, Frequency 6.80E+09Hz, Percentage 5.00E+00%, Power 1.80E-01W

DOI:10.3788/gzxb20215009.0914001

Funding details: Number: Y855F21213, Acronym: XIOPM, Sponsor: Xi'an Institute of Optics and Precision Mechanics;Number: 2021GY-284, Acronym: -, Sponsor: Shanxi Provincial Key Research and Development Project;

Funding text:Foundation item：Western Young Scholar Foundation of Western Glory Project（No. E129321101），Key Research and Development Plan of Shaanxi Province（No. 2021GY-284），Key Cultivation Project of Xi’an Institute of Optics and Precision Mechanics（No. Y855F21213）

Database:Compendex

Accession number:20220211437954

Title:Optimization of resistive anode for a single photon imaging detector

Authors:Yang, Kai (1, 2); Wang, Bo (1); Bai, Yonglin (1); Cao, Weiwei (1); Yang, Yang (1); Zhu, Bingli (1); Zheng, Jinkun (1); Bai, Xiaohong (1)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12065

Part number:1 of 1

Issue title:AOPC 2021: Optical Sensing and Imaging Technology

Issue date:2021

Publication year:2021

Article number:120652W

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510650053

Document type:Conference article (CA)

Conference name:2021 Applied Optics and Photonics China: Optical Sensing and Imaging Technology, AOPC 2021

Conference date:June 20, 2021 - June 22, 2021

Conference location:Beijing, China

Conference code:175876

Sponsor:Chinese Society for Optical Engineering

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">A Finite Element Method (FEM) to establish the model of CAT resistive anode and Square resistive anode is proposed. The characteristics of electrode charge signal are analyzed. The factors that affect the position reconstruction linearity of resistive anode are analyzed, including the geometric parameters and sheet resistance of the surface resistive layer, by calculating the amount of electrode charge from a simulated photon hit. It has been concluded that signal development time should be greater than 8R'C' (R'C' =RC2) seconds in order to ensure the root mean square (RMS) nonlinearity (%) of position reconstruction is less than 3% for these two resistive anodes, with capacitance C, and sheet resistance R of sensitive region.<br/></div> © 2021 SPIE.

Number of references:13

Main heading:Finite element method

Controlled terms:Particle beams - Anodes - Photons - Sheet resistance

Uncontrolled terms:Charge signals - Electrode charge - Micro channel plate - Optimisations - Photon imaging detectors - Photon-counting imaging - Position reconstruction - Position-sensitive anodes - Resistive anodes - Single-photon imaging

Classification code:714.1 Electron Tubes - 921.6 Numerical Methods - 931.3 Atomic and Molecular Physics - 932.1 High Energy Physics - 942.2 Electric Variables Measurements

Numerical data indexing:Percentage 3.00E+00%

DOI:10.1117/12.2606769

Funding details: Number: 11803074, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:This work is supported by a grant from the National Natural Science Foundation of China (No. 11803074).

Database:Compendex

Accession number:20211410162068

Title:Research on geometric error correction of pushbroom hyperspectral camera carried by UAV

Authors:Yihao, Wang (1, 3); Qiang, Cong (2); Shun, Yao (2); Xinyin, Jia (1); Jianyu, Chen (3); Siyuan, Li (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Xi'an; Shanxi; 710119, China; (2) China Spacesat Co. Ltd, Beijing; 100094, China; (3) State Key Laboratory of Satellite Ocean Environment Dynamics, Hangzhou; Zhejiang; 310012, China

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11763

Part number:1 of 1

Issue title:Seventh Symposium on Novel Photoelectronic Detection Technology and Applications

Issue date:2021

Publication year:2021

Article number:117634G

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510643611

Document type:Conference article (CA)

Conference name:7th Symposium on Novel Photoelectronic Detection Technology and Applications

Conference date:November 5, 2020 - November 7, 2020

Conference location:Kunming, China

Conference code:167886

Sponsor:Chinese Society for Optical Engineering (CSOE); Science and Technology on Low-light-level Night Vision Laboratory

Publisher:SPIE

Abstract:In recent years, the commercialized low-cost rotor UAV equipped with small hyperspectral camera has become an emerging way to acquire hyperspectral remote sensing data due to its advantages of convenient data acquisition and low cost, and has been widely used in environmental monitoring, precision agriculture, ocean development and other fields. Due to its light weight, the flight process of the rotor UAV is vulnerable to the influence of air flow, which leads to the poor stability of the platform and resulting in the geometric distortion of the imaging. This situation is particularly prominent in the obvious air flow areas such as the lake and the sea, which restricts the application in related fields. In this paper, the geometric processing of UAV-borne hyperspectral measured data collected at a wharf in Qiandao Lake is studied. There are two major factors lead to geometric error. One is the longitude and latitude step error, the other is the frame frequency of the navigation data is lower than the image exposure frame frequency. In this situation, this paper proposes a step fitting method to perform geometric correction and error correction for the hyperspectral airstrip data. Compared with the traditional Kalman filtering method and the global linear fitting method, the proposed method can better correct the geometric distortion of hyperspectral image caused by the low-precision GPS/INS system, which provides a foundation for the subsequent quantitative application of lightweight UAV hyperspectral camera in various fields.<br/> © 2021 SPIE

Number of references:11

Main heading:Hyperspectral imaging

Controlled terms:Air - Antennas - Data acquisition - Geometry - Spectroscopy - Unmanned aerial vehicles (UAV) - Cameras - Costs - Error correction - Calibration - Lakes - Remote sensing

Uncontrolled terms:Environmental Monitoring - Geometric correction - Geometric distortion - Geometric processing - Hyper-spectral cameras - Hyperspectral remote sensing data - Kalman filtering method - Ocean development

Classification code:652.1 Aircraft, General - 723.2 Data Processing and Image Processing - 742.2 Photographic Equipment - 746 Imaging Techniques - 804 Chemical Products Generally - 911 Cost and Value Engineering; Industrial Economics - 921 Mathematics

DOI:10.1117/12.2586957

Database:Compendex

Accession number:20210609891557

Title:Quantitative atmospheric rendering for real-time infrared scene simulation

Authors:Wu, Xin (1); Zhang, Chi (1); Huang, Melin (1, 2); Yang, Chen (3); Ding, Guopeng (1)

Author affiliation:(1) School of Physics and Optoelectronic Engineering, Xidian University, Xi'an; Shaanxi; 710071, China; (2) Key Laboratory of Spectral Imaging Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; Shaanxi; 710119, China; (3) School of Automation and Information Engineering, Xi'an University of Technology, Xi'an; Shaanxi; 710048, China

Corresponding author:Huang, Melin(phmelin@snolab.ca)

Source title:Infrared Physics and Technology

Abbreviated source title:Infrared Phys Technol

Volume:114

Issue date:May 2021

Publication year:2021

Article number:103610

Language:English

ISSN:13504495

CODEN:IPTEEY

Document type:Journal article (JA)

Publisher:Elsevier B.V.

Abstract:The radiation transfer of the Earth's atmosphere is a complex progress, which involves electromagnetic propagation, thermodynamics, and molecular spectroscopy. Atmospheric effects on an infrared scene were presented as transmission, absorption, and scattering. Atmospheric rendering thus aims to visually display these effects of the radiation through the Earth's atmosphere. In this paper, a quantitative atmospheric rendering method was proposed for real-time infrared scene simulation. By counting the selective absorption of water, carbon dioxide, and ozone on an infrared spectrum, transmittance was calculated using Lambert–Beer's law, the steady-state path radiation was precomputed according to Kirchhoff's law, and the Rayleigh and Mie scattering effects were calculated with GPU when an infrared scene was rendered in real-time. Simulations were conducted to verify the performance of the proposed method by comparing our results with those obtained from the MODTRAN program.<br/> © 2021 Elsevier B.V.

Number of references:35

Main heading:Carbon dioxide

Controlled terms:Absorption spectroscopy - Radiation effects - Water absorption - Radiative transfer - Thermodynamics - Earth atmosphere - Rendering (computer graphics)

Uncontrolled terms:Atmospheric effects - Electromagnetic propagation - Infrared spectrum - Radiation transfer - Rayleigh and Mie scattering - Rendering methods - Scene simulations - Selective absorption

Classification code:443.1 Atmospheric Properties - 641.1 Thermodynamics - 701 Electricity and Magnetism - 723.2 Data Processing and Image Processing - 723.5 Computer Applications - 802.3 Chemical Operations - 804.2 Inorganic Compounds

DOI:10.1016/j.infrared.2020.103610

Funding details: Number: 2019010810063, Acronym: -, Sponsor: Aeronautical Science Foundation of China;Number: 17JK0536, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Provincial Department of Education;Number: JB180510, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;Number: B17035, Acronym: -, Sponsor: Higher Education Discipline Innovation Project;Number: 61705179,61904138, Acronym: -, Sponsor: National Science Fund for Distinguished Young Scholars;Number: 2019JQ-235, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;

Funding text:This work is supported by the National Science Foundation for Distinguished Young Scholars of China ( 61904138 , 61705179 ), and partial funding is provided by the Fundamental Research Funds for the Central Universities ( JB180510 ), Aeronautical Science Foundation of China ( 2019010810063 ), the 111 Project ( B17035 ), Natural Science Foundation of Shaanxi Provincial Department of Education ( 17JK0536 ), and Natural Science Basic Research Program of Shaanxi ( 2019JQ-235 ).

Database:Compendex

Accession number:20211610223004

Title:Infrared and visible image fusion based on edge-preserving guided filter and infrared feature decomposition

Authors:Ren, Long (1, 2, 3); Pan, Zhibin (2); Cao, Jianzhong (1); Zhang, Hui (1, 3); Wang, Hao (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) Faculty of electronics and communications of Xi'an Jiaotong University, Xi'an; 710049, China; (3) University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Shijingshan District, Beijing; 100049, China

Corresponding author:Ren, Long(renlong513@126.com)

Source title:Signal Processing

Abbreviated source title:Signal Process

Volume:186

Issue date:September 2021

Publication year:2021

Article number:108108

Language:English

ISSN:01651684

CODEN:SPRODR

Document type:Journal article (JA)

Publisher:Elsevier B.V.

Abstract:<div data-language="eng" data-ev-field="abstract">Infrared (IR) images can distinguish salient targets from their backgrounds based on the radiation difference in all-weather conditions. By contrast, visible (VIS) images can contain high-resolution texture and details information, which is more suitable for human observation. Therefore, it is quite necessary to combine both imaging advantages of these two kinds of images. Compared with the existing methods, we believe that scale decomposition based methods are the most active and efficient image fusion methods, which also have the best fusion effects. Inspired by the present scale decomposition methods, we propose a new feature decomposition method. Firstly, we propose an improved guided filter called edge-preserving guided filter (EPGF), which adopts the image gradient map for further improving the filtering effect. Subsequently, by using the EPGF, we decompose the IR and VIS images into three kinds of layers, including salient feature layers, luminance layers and detail layers. At the same time, we combine all the layers together to get an initial fusion result. Finally, we optimize the initial fusion image according to a new image fusion optimization model and ADMM, and the final fusion result will be obtained after several iterations. Compared with other scale decomposition methods, our proposed feature decomposition based method takes the IR salient targets, IR and VIS background illumination, as well as VIS details into consideration which is more in line with human visual observation, besides the computational efficiency is also superior. Experimental results indicate that this method has better subjective and objective evaluation results compared with other state-of-the-art methods.<br/></div> © 2021 Elsevier B.V.

Number of references:55

Main heading:Image fusion

Controlled terms:Textures - Computational efficiency - Decomposition methods - Image enhancement

Uncontrolled terms:ADMM image optimization - Condition - Decomposition methods - Edge preserving - Edge-preserving guided filter - Feature decomposition - Guided filters - Infrared and visible image - Infrared features - Visible image

Classification code:723.2 Data Processing and Image Processing

DOI:10.1016/j.sigpro.2021.108108

Funding details: Number: XAB2017B22, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: -, Acronym: -, Sponsor: West Light Foundation of the Chinese Academy of Sciences;

Funding text:This work was supported by West Light Foundation of The Chinese Academy of Sciences (XAB2017B22).

Database:Compendex

Accession number:20220811682281

Title:Zoom lens with large aperture and long focal length in the integration system of detection and recognition

Authors:Yao, Rui (1, 2); Li, Xuyang (1); Ma, Zixuan (1, 2); Ren, Zhiguang (1, 2); Chu, Nanqing (1, 2)

Author affiliation:(1) Space Optics Technology Lab, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Shaanxi, Xi'an; 710119, China; (2) School Of Optoelectronics, University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Li, Xuyang(lixuyang2004@126.com)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12070

Part number:1 of 1

Issue title:10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes

Issue date:2021

Publication year:2021

Article number:1207007

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510650152

Document type:Conference article (CA)

Conference name:10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes 2021

Conference date:June 14, 2021 - June 17, 2021

Conference location:Chengdu, China

Conference code:176905

Sponsor:Institute of Optics and Electronics (IOE), Chinese Academy of Sciences; The Chinese Optical Society (COS)

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">This paper designs an integrated optical system for detection and recognition. The system combines the R-C (Ritchey-Chretien optics) system and the zoom structure. The R-C mirror design of the initial structure of the system is completed by calculation of theory. Then, use the zoom theory to complete the design of the two zoom positions. The two zoom positions respectively realize the detection and identification of space debris. The F numbers are 5.86 and 11. The field of view angles are 2.83°and 0.6°. It works in band of 400-750nm. The system has an entrance pupil diameter of 300mm. The detection position can detect space debris with a brightness of 13 magnitude stars, with focal length of 1760mm; the recognition position's modulation transfer function is greater than 0.6 at the Nyquist frequency of 33.33lp/mm, with the focal length of 3300mm. The zoom theory is well applied in the integrated detection and recognition system.<br/></div> © 2021 SPIE

Number of references:11

Main heading:Optical design

Controlled terms:Optical systems - Space debris - Lenses

Uncontrolled terms:Detection system - Focal lengths - Integrated optical systems - Integrated systems - Integration systems - Large aperture - Long focal lengths - Ritchey-chretien optic - Zoom lens - Zoom structure

Classification code:656.1 Space Flight - 741.1 Light/Optics - 741.3 Optical Devices and Systems

Numerical data indexing:Size 1.76E+00m, Size 3.00E-01m, Size 3.30E+00m, Size 4.00E-07m to 7.50E-07m

DOI:10.1117/12.2604746

Database:Compendex

Accession number:20210809947554

Title:A Supervised Segmentation Network for Hyperspectral Image Classification

Authors:Sun, Hao (1, 2); Zheng, Xiangtao (3); Lu, Xiaoqiang (3)

Author affiliation:(1) Key Laboratory of Spectral Imaging Technology Cas, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) The University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Key Laboratory of Spectral Imaging Technology Cas, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China

Corresponding author:Zheng, Xiangtao(xiangtaoz@gmail.com)

Source title:IEEE Transactions on Image Processing

Abbreviated source title:IEEE Trans Image Process

Volume:30

Issue date:2021

Publication year:2021

Pages:2810-2825

Article number:9347809

Language:English

ISSN:10577149

E-ISSN:19410042

CODEN:IIPRE4

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:Recently, deep learning has drawn broad attention in the hyperspectral image (HSI) classification task. Many works have focused on elaborately designing various spectral-spatial networks, where convolutional neural network (CNN) is one of the most popular structures. To explore the spatial information for HSI classification, pixels with its adjacent pixels are usually directly cropped from hyperspectral data to form HSI cubes in CNN-based methods. However, the spatial land-cover distributions of cropped HSI cubes are usually complicated. The land-cover label of a cropped HSI cube cannot simply be determined by its center pixel. In addition, the spatial land-cover distribution of a cropped HSI cube is fixed and has less diversity. For CNN-based methods, training with cropped HSI cubes will result in poor generalization to the changes of spatial land-cover distributions. In this paper, an end-to-end fully convolutional segmentation network (FCSN) is proposed to simultaneously identify land-cover labels of all pixels in a HSI cube. First, several experiments are conducted to demonstrate that recent CNN-based methods show the weak generalization capabilities. Second, a fine label style is proposed to label all pixels of HSI cubes to provide detailed spatial land-cover distributions of HSI cubes. Third, a HSI cube generation method is proposed to generate plentiful HSI cubes with fine labels to improve the diversity of spatial land-cover distributions. Finally, a FCSN is proposed to explore spectral-spatial features from finely labeled HSI cubes for HSI classification. Experimental results show that FCSN has the superior generalization capability to the changes of spatial land-cover distributions.<br/> © 1992-2012 IEEE.

Number of references:52

Main heading:Pixels

Controlled terms:Classification (of information) - Image classification - Neural networks - Convolution - Deep learning - Spatial distribution - Spectroscopy - Geometry - Image segmentation

Uncontrolled terms:Adjacent pixels - Classification tasks - Generalization capability - Generation method - Hyperspectral Data - Spatial features - Spatial informations - Supervised segmentation

Classification code:405.3 Surveying - 461.4 Ergonomics and Human Factors Engineering - 716.1 Information Theory and Signal Processing - 723.2 Data Processing and Image Processing - 902.1 Engineering Graphics - 903.1 Information Sources and Analysis - 921 Mathematics

DOI:10.1109/TIP.2021.3055613

Funding text:Manuscript received May 7, 2020; revised October 3, 2020; accepted January 22, 2021. Date of publication February 4, 2021; date of current version February 12, 2021. This work was supported in part by the National Science Fund for Distinguished Young Scholars under Grant 61925112, in part by the National Natural Science Foundation of China under Grant 61806193 and Grant 61772510, in part by the Innovation Capability Support Program of Shaanxi under Grant 2020KJXX-091 and Grant 2020TD-015, in part by the Natural Science Basic Research Program of Shaanxi under Grant 2019JQ-340 and 2019JC-23, and in part by CAAI-Huawei MindSpore Open Fund. The associate editor coordinating the review of this manuscript and approving it for publication was Dr. Jocelyn Chanussot. (Corresponding author: Xiangtao Zheng.) Hao Sun is with the Key Laboratory of Spectral Imaging Technology CAS, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China, and also with the University of Chinese Academy of Sciences, Beijing 100049, China.

Database:Compendex

Accession number:20214511113416

Title:Real-time fire detection network for intelligent surveillance systems

Authors:Liu, Ruqi (1, 2); Wu, Siyuan (1, 2); Lu, Xiaoqiang (1)

Author affiliation:(1) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Shaanxi, Xi'an; 710119, China; (2) University of Chinese Academy of Sciencea, Beijing; 100049, China

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11911

Part number:1 of 1

Issue title:2nd International Conference on Computer Vision, Image, and Deep Learning

Issue date:2021

Publication year:2021

Article number:1191114

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510646810

Document type:Conference article (CA)

Conference name:2nd International Conference on Computer Vision, Image, and Deep Learning

Conference date:June 25, 2021 - June 27, 2021

Conference location:Liuzhou, China

Conference code:172953

Sponsor:Guangzhou Computer Society; Universiti Teknikal Malaysia Melaka

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">Based on the concept of deep learning, the proposed convolutional neural networks (CNNs) processing of extracted image features has been recently applied to tackle early fire detection during surveillance. However, such methods generally need more computational time and memory and seldom take smoke that always produced before fires into consideration, which results in poor detection speed and accuracy relatively. In this paper, we propose a novel imagebased fire and smoke detection network. Inspired by Yolov5 architecture, considering the untargeted feature extraction capability and limited receptive fields of Yolov5, the SSHC (Single Stage Headless Context) module is added to the backbone layer to enhance the feature extraction of flames and smoke. The RFB (Receptive Field Block) module is added to the fusion layer to increase the receptive field of our network. Not only does our network detect fire and smoke well in different fire scenes, different shooting angles, and different lighting conditions, but also achieves a speed of 83 FPS, meeting the real-time detection requirements in the detection speed. Meanwhile, we have built a high quality, constructed by collecting from real scenes and annotated by strict and reasonable rules dataset for fire and smoke detection to verify the superiority of our network. Our proposed network achieves 97.2% accuracy for fire detection, 92.4% accuracy for smoke detection. Experimental results on benchmark fire-smoke datasets reveal the effectiveness of the proposed framework and validate its suitability for fire and smoke detection in surveillance systems compared to state-of-the-art methods.<br/></div> © 2021 SPIE.

Number of references:46

Main heading:Smoke

Controlled terms:Feature extraction - Monitoring - Extraction - Fires - Real time systems - Deep learning - Convolutional neural networks - Security systems - Smoke detectors

Uncontrolled terms:Detection networks - Detection speed - Features extraction - Fire detection - Receptive field block - Receptive fields - Single stage - Single stage headless context - Smoke detection - Yolov5

Classification code:461.4 Ergonomics and Human Factors Engineering - 722.4 Digital Computers and Systems - 802.3 Chemical Operations - 914.1 Accidents and Accident Prevention - 914.2 Fires and Fire Protection

Numerical data indexing:Percentage 9.24E+01%, Percentage 9.72E+01%

DOI:10.1117/12.2604559

Database:Compendex

Accession number:20213210748432

Title:Infrared and visible image fusion based on variational auto-encoder and infrared feature compensation

Authors:Ren, Long (1, 2, 3); Pan, Zhibin (2); Cao, Jianzhong (1); Liao, Jiawen (1, 2, 3)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) Faculty of Electronics and Communications of Xi'an Jiaotong University, Xi'an; 710049, China; (3) University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Shijingshan District, Beijing; 100049, China

Corresponding author:Ren, Long(renlong@opt.ac.cn)

Source title:Infrared Physics and Technology

Abbreviated source title:Infrared Phys Technol

Volume:117

Issue date:September 2021

Publication year:2021

Article number:103839

Language:English

ISSN:13504495

CODEN:IPTEEY

Document type:Journal article (JA)

Publisher:Elsevier B.V.

Abstract:<div data-language="eng" data-ev-field="abstract">With high sensitivity to capture rich details, visible imaging equipment can take images containing more textures and contours which are important to visual perception. Unlike visible cameras, infrared imaging devices can detect targets invisible in visible images, because the imaging principle of infrared sensors derives from differences of thermal radiation. Thus, the purpose of image fusion is to merge as much meaningful feature information from the infrared and visible images into the fused image as possible, such as contours as well as textures of the visible image and thermal targets of the infrared image. In this paper, we propose an image fusion network based on variational auto-encoder (VAE), which performs the image fusion process in deep hidden layers. We divide the proposed network into image fusion network and infrared feature compensation network. Firstly, in the image fusion network, the encoder of the image fusion network is created to generate the latent vectors in hidden layers from the input visible image and infrared image. Secondly, two different latent vectors merge into one based on the product of Gaussian probability density; accordingly, the decoder begins to reconstruct the fused image with the descent of the loss function value. Meanwhile, Residual block and symmetric skip connection methods are added to the network to enhance the efficiency of network training. Finally, due to the defect of the loss function setting in the fusion network, an infrared feature compensation network is designed to compensate critical radiation features of the infrared image. Experimental results on public available datasets demonstrate that the proposed method is superior to other traditional and deep learning methods in both objective metrics and subjective visual perception.<br/></div> © 2021

Number of references:46

Main heading:Image fusion

Controlled terms:Convolutional neural networks - Textures - Thermography (imaging) - Deep learning - Vision - Learning systems

Uncontrolled terms:Autoencoders - Convolutional neural network - Feature compensation - Fused images - Infrared and visible image - Infrared features - Thermal - Variational auto-encoder - Visible image - Visual perception

Classification code:461.4 Ergonomics and Human Factors Engineering - 723.2 Data Processing and Image Processing - 742.1 Photography

DOI:10.1016/j.infrared.2021.103839

Funding details: Number: 51905529, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2019JQ-295, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;

Funding text:This work was supported by National Natural Science Foundation of China (NSFC) ( 51905529 ); Natural Science Basic Research Program of Shaanxi Province ( 2019JQ-295 ).

Database:Compendex

Accession number:20221111780067

Title:WEIGHTED SPARSITY CONSTRAINT TENSOR FACTORIZATION FOR HYPERSPECTRAL UNMIXING

Authors:Yuan, Yuan (1); Dong, Le (2, 3)

Author affiliation:(1) School of Artificial Intelligence, Optics and Electronics (iOPEN), Northwestern Polytechnical University, Xi'an; 710072, China; (2) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Shannxi, Xi'an; 710119, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Yuan, Yuan

Source title:International Geoscience and Remote Sensing Symposium (IGARSS)

Abbreviated source title:Dig Int Geosci Remote Sens Symp (IGARSS)

Volume:2021-July

Part number:1 of 1

Issue title:IGARSS 2021 - 2021 IEEE International Geoscience and Remote Sensing Symposium, Proceedings

Issue date:2021

Publication year:2021

Pages:3333-3336

Language:English

CODEN:IGRSE3

ISBN-13:9781665403696

Document type:Conference article (CA)

Conference name:2021 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2021

Conference date:July 12, 2021 - July 16, 2021

Conference location:Brussels, Belgium

Conference code:176845

Sponsor:The Institute of Electrical and Electronics Engineers Geoscience and Remote Sensing Society (GRSS)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">Recently, the unmixing methods based on non-negative tensor factorization (NTF) have received a lot of attention. Many NTF-based methods combine total variation (TV) regularization, aiming at maintaining the smoothness of the abundance maps to improve the performance of unmixing. However, the existing TV regularization ignores the sparsity sharing on the spatial difference images among different bands. To tackle this issue, a weighted total variation regularizer on the spatial difference maps of abundances is proposed in this paper, which uses the L<inf>2,1</inf> norm to explore the sparse structure in abundances along the spectral dimension. In addition, the L<inf>1/2</inf> norm is used to enhance the spatial sparsity of abundances. The proposed method can not only enhance the sparsity in abundances, but also keep the spatial similarity characteristics of data. Compared with the existing popular methods, the proposed method has superior performance on both synthetic data and real data.<br/></div> © 2021 IEEE.

Number of references:11

DOI:10.1109/IGARSS47720.2021.9553154

Funding details: Number: 61632018, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2020YFB2103902, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;Number: 61825603, Acronym: -, Sponsor: National Science Fund for Distinguished Young Scholars;

Funding text:This work was supported by the National Key Research and Development Project under Grant 2020YFB2103902, the National Science Fund for Distinguished Young Scholars under Grant 61825603, and the Key Program of National Natural Science Foundation of China under Grant 61632018.

Database:Compendex

Accession number:20220211446975

Title:Beam shaping technology based on phase-only liquid-crystal spatial light modulator

Authors:Wang, Shan (1, 2); Zhao, Hualong (1); Yang, Xiaojun (1)

Author affiliation:(1) Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, ShanxiXi'an; 710119, China; (2) University of Chinese Academy of Science, Beijing; 10049, China

Corresponding authors:Zhao, Hualong(zhaohualong@opt.ac.cn); Wang, Shan(wangshan@opt.cn)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12060

Part number:1 of 1

Issue title:AOPC 2021: Advanced Laser Technology and Applications

Issue date:2021

Publication year:2021

Article number:120601B

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510649958

Document type:Conference article (CA)

Conference name:2021 Applied Optics and Photonics China: Advanced Laser Technology and Applications, AOPC 2021

Conference date:June 20, 2021 - June 22, 2021

Conference location:Beijing, China

Conference code:175856

Sponsor:Chinese Society for Optical Engineering

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">The liquid crystal spatial light modulator is an effective method to change the quality of the laser beam light field distribution, and the phase hologram is the key to the function of the pure phase liquid crystal spatial light modulator. An improved iterative algorithm for beam shaping is proposed, which is improved on the basis of the traditional G-S algorithm. The improved algorithm is more universal, has better rapid convergence and design flexibility. By proposing an optimization factor ζ, the original uneven light intensity distribution in the light field is compensated, and the advantages of the G-S algorithm that the light field is reshaped by the clear boundary are retained and the uniformity of the light field distribution is improved. The experimental results show that the liquid crystal spatial light modulator can improve the nearfield beam quality very well, the energy utilization rate of the shaped output beam is 97%, and its top unevenness is 25.6%.<br/></div> © 2021 SPIE.

Number of references:16

Main heading:Laser beams

Controlled terms:Light modulators - Liquid crystals - Iterative methods - Light modulation - Energy utilization

Uncontrolled terms:Beam-shaping - Flat top beam - G-S algorithms - GS algorithm - Light field distribution - Light fields - Liquid crystal spatial light modulators - Phase-only - Shaping technologies - Technology-based

Classification code:525.3 Energy Utilization - 741.1 Light/Optics - 744.8 Laser Beam Interactions - 921.6 Numerical Methods

Numerical data indexing:Percentage 2.56E+01%, Percentage 9.70E+01%

DOI:10.1117/12.2606722

Database:Compendex

Accession number:20220211450478

Title:Optical design of volume phase holographic grating Raman spectrometer for lunar mineral detection

Authors:Linghu, Birong (1, 2); Xue, Bin (1); Zhao, Yiyi (1); Wang, Hui (3)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an, 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Science and Technology on Near-Surface Detection Laboratory, Wuxi; 214035, China

Corresponding authors:Xue, Bin(xuebin@opt.ac.cn); Wang, Hui(huiwang198928@126.com)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12064

Part number:1 of 1

Issue title:AOPC 2021: Optical Spectroscopy and Imaging

Issue date:2021

Publication year:2021

Article number:120640H

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510650039

Document type:Conference article (CA)

Conference name:2021 Applied Optics and Photonics China: Optical Spectroscopy and Imaging, AOPC 2021

Conference date:June 20, 2021 - June 22, 2021

Conference location:Beijing, China

Conference code:175875

Sponsor:Chinese Society for Optical Engineering

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">In order to overcome the problems of low diffraction efficiency, large aberrations and stray light of traditional ruled gratings in reflective Raman spectrometers, combined with the characteristics of the Raman signals of lunar surface minerals, a volume phase holographic (VPH) grating Raman spectrometer system for lunar surface detection was designed. The spectral range of the spectrometer is 140&sim;3073cm-1, and the field of view is 3°. According to the Kogelnik coupled wave theory, the diffractive efficiency of the designed VPH grating is more than 95% at the central wavelength, and the average efficiency is more than 80% in the whole spectral range. After optimizing with zemax, the MTF of the entire spectrometer system at the Nyquist frequency is greater than 0.45, and a spectral resolution of 10 cm-1 can be achieved.<br/></div> Copyright © 2021 SPIE.

Number of references:9

Main heading:Spectrometers

Controlled terms:Aberrations - Diffraction gratings - Efficiency - Holography - Minerals - Moon - Optical design - Stray light

Uncontrolled terms:Coupled wave theory - Field of views - Lunar mineral - Lunar surface - Raman signal - Raman spectrometers - Resolution - Spectral range - Surface detection - Volume-phase holographic gratings

Classification code:482.2 Minerals - 657.2 Extraterrestrial Physics and Stellar Phenomena - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 743 Holography - 746 Imaging Techniques - 913.1 Production Engineering

Numerical data indexing:Percentage 8.00E+01%, Percentage 9.50E+01%, Size 1.00E-01m, Size 3.073E+01m

DOI:10.1117/12.2606573

Funding details: Number: 6142414070114, Acronym: -, Sponsor: Foundation of Science and Technology on Near-Surface Detection Laboratory;

Funding text:This work has been sponsored in part by Science and Technology on Near-Surface Detection Laboratory (No.6142414070114)This work has been sponsored in part by Science and Technology on Near-Surface Detection Laboratory

Database:Compendex

Accession number:20214711192499

Title:Research on High Precision Locating of Laser Spot Center in Free-Space Laser Communication System

Authors:Meng, Xiangsheng (1, 2, 3); Ma, Caiwen (1, 3); Tian, Yan (1, 3); Han, Junfeng (1, 3); Liang, Dongsheng (1, 3)

Author affiliation:(1) Xi'An Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Key Laboratory of Space Precision Measurement Technology, Chinese Academy of Sciences, Xi'an; 710119, China

Source title:IEEE Information Technology, Networking, Electronic and Automation Control Conference, ITNEC 2021

Abbreviated source title:IEEE Inf. Technol., Netw., Electron. Autom. Control Conf., ITNEC

Part number:1 of 1

Issue title:IEEE Information Technology, Networking, Electronic and Automation Control Conference, ITNEC 2021

Issue date:October 15, 2021

Publication year:2021

Pages:1625-1629

Language:English

ISBN-13:9781665415989

Document type:Conference article (CA)

Conference name:5th IEEE Information Technology, Networking, Electronic and Automation Control Conference, ITNEC 2021

Conference date:October 15, 2021 - October 17, 2021

Conference location:Xi'an, China

Conference code:173516

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">The gray centroid algorithm is usually used as the centroid locating algorithm in the free-space laser communication system. However, the limited spatial resolution of the image detector will produce homogenization effect, which results in gray quantization error. Moreover, the spot information will lost when we detecting the object with threshold. The two problems mentioned above will make the locating accuracy worse when using the conventional algorithm. In this paper, we use the squared weighting centroid with threshold algorithm combined with the hardware optimized interpolation subdivision algorithm to improve the locating accuracy. As the weight of bright pixels increased, and the spot information loss decreased due to subdivision, the locating accuracy improved significantly. The simulation results show that the locating accuracy has improved by at least 50%, and the experiment results confirmed that the tracking error (2.57μrad) using the improved algorithm is less than that (4.11μrad) of the conventional algorithm.<br/></div> © 2021 IEEE.

Number of references:8

Main heading:Interpolation

Controlled terms:Object detection - Location

Uncontrolled terms:Bilinear interpolation - Centroid algorithm - Conventional algorithms - Free space laser communication systems - Hardware implementations - High-precision locating - Laser spot centroid - Laser spots - Locating algorithm - Spot centers

Classification code:723.2 Data Processing and Image Processing - 921.6 Numerical Methods

Numerical data indexing:Percentage 5.00E+01%

DOI:10.1109/ITNEC52019.2021.9587297

Database:Compendex

Accession number:20211010037844

Title:Correction of the error induced by obscurations of Ritchey-Chretien collimators for high-resolution space camera MTF measured with the ISO 12233 slanted-edge method

Authors:Liu, Shangkuo (1, 2); Liu, Kai (1); E, Kewei (1); Wang, Tao (1); Li, Zhaohui (1); Yao, Baoli (1)

Author affiliation:(1) Chinese Academy of Science, Xi'an Institute of Optics and Precision Mechanics, No.17 Xinxi Road, Xi'an; 710119, China; (2) University of Chinese Academy of Science, No.19(A) Yuquan Road, Beijing; 100049, China

Corresponding author:Liu, Shangkuo(liushangkuo@opt.ac.cn)

Source title:Optik

Abbreviated source title:Optik

Volume:235

Issue date:June 2021

Publication year:2021

Article number:166653

Language:English

ISSN:00304026

Document type:Journal article (JA)

Publisher:Elsevier GmbH

Abstract:We propose a method to correct the error induced by the obscurations of Ritchey-Chretien (R-C) collimators, when measuring modulation transfer function (MTF) of high-resolution space cameras by the ISO 12,233 slanted-edge method. The obscurations of an R-C collimator include the secondary mirror (SM) and its supporting bars. Mathematical models are derived to simulate possible obscurations by virtual surfaces of Zemax, with which we get the correction function (CF) of the obscuration induced error (OIE). Simulated results manifest that the proposed method can correct the OIE. Furthermore, an experiment setup is established with the same system parameters of the previous Zemax modeled system. The experiment results verify the effectiveness of the proposed method again. Our method can guarantee the precision of the ISO 12,233 slanted-edge method when an R-C collimator is chosen.<br/> © 2021 Elsevier GmbH

Number of references:23

Main heading:Optical transfer function

Controlled terms:Errors - Modulation - Cameras

Uncontrolled terms:Correction function - Experiment set-up - High resolution - ISO 12233 - Secondary mirror - Simulated results - Slanted-edge method - Space cameras

Classification code:741.1 Light/Optics - 742.2 Photographic Equipment

DOI:10.1016/j.ijleo.2021.166653

Database:Compendex

Accession number:20211410174167

Title:Single-mode fiber to GRIN-rod lenses coupling efficiency and tolerance analysis

Authors:Song, Wei (1, 2); Y., Xie; Z., Li; W., Hao; P., Yan; X., Li

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Science, Xi’an; 710119, China; (2) University of Chinese Academy of Science, Beijing; 100049, China

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11780

Part number:1 of 1

Issue title:Global Intelligent Industry Conference 2020

Issue date:2021

Publication year:2021

Article number:117801E

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510643949

Document type:Conference article (CA)

Conference name:Global Intelligent Industry Conference 2020

Conference date:November 20, 2020 - November 21, 2020

Conference location:Guangzhou, China

Conference code:167976

Sponsor:Chinese Society for Optical Engineering

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">The single-mode fiber coupling efficiency with graded-index rod lenses can achieve higher coupling efficiency, compared with the direct alignment coupling of the single-mode fiber. The assembly error of direct alignment has a far greater impact on the coupling efficiency of the fiber than the GRIN lenses coupling to fiber. The analysis of the influence of the coupling error on the optical fiber coupling efficiency provides important theoretical support and guidance for processing and assembly. Axial error, radial error and angular tilt will all have different effects on fiber coupling efficiency. However, the fiber coupling system is not only limited to the coupling of the fiber and GRIN lenses, but also can be coupled with one or more lenses to analyze the advantages and disadvantages of multiple coupling methods.<br/></div> © 2021 SPIE

Number of references:7

Main heading:Single mode fibers

Controlled terms:Efficiency - Fits and tolerances - Optical fiber coupling - Errors

Uncontrolled terms:Coupling efficiency - Coupling errors - Coupling methods - Different effects - Fiber couplings - Fiber-coupling efficiency - Single-mode-fiber coupling - Tolerance analysis

Classification code:741.1.2 Fiber Optics - 913.1 Production Engineering

DOI:10.1117/12.2590659

Database:Compendex

Accession number:20220211438133

Title:The centroid extraction algorithm of sun based on multi-color model

Authors:Ma, Ling (1, 2); Qiao, Weidong (1); Wang, Hui (3)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Science and Technology on Near-Surface Detection Laboratory, Wuxi; 214035, China

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12065

Part number:1 of 1

Issue title:AOPC 2021: Optical Sensing and Imaging Technology

Issue date:2021

Publication year:2021

Article number:120652H

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510650053

Document type:Conference article (CA)

Conference name:2021 Applied Optics and Photonics China: Optical Sensing and Imaging Technology, AOPC 2021

Conference date:June 20, 2021 - June 22, 2021

Conference location:Beijing, China

Conference code:175876

Sponsor:Chinese Society for Optical Engineering

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">This paper proposes a method for extracting the solar centroid based on a multi-color model. The method is based on the three-color models (Lab, HIS, RGB) to segment and extract the color features of the image at the same time, coarsely locate the existence area of the sun target, and filter the obtained results through shape features, etc. We should try our best to optimize algorithm, for which can obtain a precise sun image. It is very important to combine circle center fitting with edge extraction to obtain the coordinate of edge point. What's more, we need to select the edge points to form a sample set of edge points. It is helpful to fit the center of the circle by the least square method. The algorithm is improved to find the center of mass of the sun. By subjective judgment and error analysis evaluation of a large number of results, this method is useful as we expecting for the segmentation and extraction of solar targets. But due to the interference of the shooting angle, light, exposure, weather and other factors when the image was taken, which makes the result of target segmentation not ideal. However, it has little effect on the final centroid extraction result.<br/></div> © 2021 SPIE.

Number of references:8

Main heading:Image segmentation

Controlled terms:RGB color model - Extraction - Least squares approximations

Uncontrolled terms:And filters - Centroid extractions - Color features - Color models - Edge point - Extraction algorithms - Images segmentations - Multi-color models - Optimal threshold - Shape features

Classification code:741.1 Light/Optics - 802.3 Chemical Operations - 921.6 Numerical Methods

DOI:10.1117/12.2606559

Funding details: Number: -, Acronym: -, Sponsor: Foundation of Science and Technology on Near-Surface Detection Laboratory;

Funding text:been sponsored in part by Science and Technology on Near-Surface Detection Laboratory

Database:Compendex

Accession number:20214111016202

Title:Method to Improve the Detection Accuracy of Quadrant Detector Based on Neural Network

Authors:Wang, Xuan (1); Su, Xiuqin (2); Liu, Guizhong (3); Han, Junfeng (2); Zhu, Wenhua (2); Liu, Zengxin (2)

Author affiliation:(1) Xi'An Institute of Optics and Precision Mechanics of CAS, School of Electronic and Information Engineering, Xi'An Jiaotong University, University of Chinese Academy of Sciences, Xi'an, China; (2) Institute of Optics and Precision Mechanics of CAS, Xi an; 710119, China; (3) School of Electronic and Information Engineering, Xi'An Jiaotong University, Xi'an, China

Corresponding author:Su, Xiuqin(suxiuqin@opt.ac.cn)

Source title:IEEE Photonics Technology Letters

Abbreviated source title:IEEE Photonics Technol Lett

Volume:33

Issue:22

Issue date:November 15, 2021

Publication year:2021

Pages:1254-1257

Language:English

ISSN:10411135

E-ISSN:19410174

CODEN:IPTLEL

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">The quadrant detector (QD), has developed into a core detector in the free space optical communication system. The light power received by the detector surface will be very weak after long distance transmission of laser, it brings great challenges to the high precision spot position detection of the detector. Therefore, this letter proposes a method to improve the spot position detection accuracy of the QD through artificial neural network. The neural network can solve the impact of multiple different factors on the detection accuracy of the detector at one time, which can save a lot of time and cost. Moreover, the test results of the detection accuracy of the network show that the neural network has significantly improved the detection accuracy of the spot position of the QD.<br/></div> © 1989-2012 IEEE.

Number of references:16

Main heading:Neural networks

Controlled terms:Optical communication

Uncontrolled terms:Core detectors - Detection accuracy - Free Space Optical communication - Free space optical communication systems - Neural-networks - Position detection - Quadrant detector - Quadrant detectors - Spot position

Classification code:717.1 Optical Communication Systems

DOI:10.1109/LPT.2021.3116240

Database:Compendex

Accession number:20213710879678

Title:Ultra-broadband Bragg concave diffraction grating designs on 220-nm SOI for wavelength demultiplexing (Open Access)

Authors:Li, Ke (1); Zhu, Jingping (1); Duan, Qihang (2, 3); Sun, Yuzhou (1); Hou, Xun (1, 2)

Author affiliation:(1) Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Shaanxi Key Lab of Information Photonic Technique, School of Electronic Science and Engineering, Xi'An Jiaotong University, Xi'an; 710049, China; (2) Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) Xi'An Sino Huaxin Measurement & Control Co., Ltd., Xi'an; 710304, China

Corresponding author:Zhu, Jingping(jpzhu@xjtu.edu.cn)

Source title:Optics Express

Abbreviated source title:Opt. Express

Volume:29

Issue:19

Issue date:September 13, 2021

Publication year:2021

Pages:30259-30271

Language:English

E-ISSN:10944087

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">The appropriate broadband design of a de/multiplexer can significantly increase the channel number and consequently the transmission capacity of a wavelength division multiplexing system. Herein, we present the first ultra-broadband Bragg concave diffraction grating (CDG) on a 220-nm silicon-on-insulator, covering most of the E, S, C, L, and U telecommunication wavebands spanning from 1.425 to 1.675 μm. A wide-band-gap Bragg mirror is employed to facilitate broadband reflection, with a low diffraction order of grating for a sufficient free spectral range. Numerical simulations show that the proposed approaching blazed concave diffraction grating (AB-CDG) for the two-material case exhibits a high integration, simple fabrication process, and promising spectral performance. We fabricate the grating for design verification with a low transmission loss of -0.6 dB and a crosstalk below -33.7 dB for the eight measured wavelength channels covering the spectral range from 1.5 to 1.61 μm that is limited by the bandwidth of the grating coupler. This design can be used for broadband wavelength demultiplexing, frontier astronomical observation, and spectroscopic imaging.<br/></div> © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.

Number of references:32

Main heading:Energy gap

Controlled terms:Demultiplexing - Diffraction gratings - Ultra-wideband (UWB) - Diffraction - Multiplexing equipment - Silicon on insulator technology

Uncontrolled terms:Astronomical observation - Concave diffraction grating - Spectral performance - Spectroscopic imaging - Telecommunication wavebands - Transmission capacities - Wavelength demultiplexing - Wavelength-division multiplexing system

Classification code:714.2 Semiconductor Devices and Integrated Circuits - 716.3 Radio Systems and Equipment - 741.3 Optical Devices and Systems

Numerical data indexing:Decibel -3.37e+01dB, Decibel -6.00e-01dB, Size 1.42e-06m to 1.68e-06m, Size 1.50e-06m to 1.61e-06m, Size 2.20e-07m

DOI:10.1364/OE.431133

Funding details: Number: 61890961, Acronym: NNSFC, Sponsor: National Natural Science Foundation of China;Number: 2018JM6008, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;

Funding text:Funding. National Natural Science Foundation of China (61890961); Natural Science Basic Research Program of Shaanxi Province (2018JM6008).

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20211810306677

Title:Effect of melting atmospheres on the optical property of radiation-hard fluorophosphate glass

Authors:Ma, Yuan (1, 2); Su, Haiqin (1, 3); Zhang, Zhijun (1); Wan, Rui (1, 2); Li, Shengwu (1, 2); Peng, Bo (1, 2); Wang, Pengfei (1, 2)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences (CAS), Xi'an; 710119, China; (2) Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing; 100049, China; (3) School of Physics & Information Technology, Shaanxi Normal University, Xi'an; 710000, China

Corresponding author:Wang, Pengfei(pfwang@opt.ac.cn)

Source title:Ceramics International

Abbreviated source title:Ceram Int

Volume:47

Issue:16

Issue date:August 15, 2021

Publication year:2021

Pages:22468-22477

Language:English

ISSN:02728842

CODEN:CINNDH

Document type:Journal article (JA)

Publisher:Elsevier Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">High-energy radiation in space and nuclear irradiation environment induces colour centres in optical glass, causing solarisation, and a serious condition can render optical systems and optical loads unusable. To develop space radiation-resistant optical glass, CeO<inf>2</inf>-stabilised radiation-hard fluorophosphate glass was prepared under three different atmospheres (nitrogen, oxygen, and ambient air). The glass-melting atmospheres' effects on the glass's transmission, defect formation, and structural changes before and after exposure to gamma radiation were investigated by a comprehensive study on their transmittance, absorption, and electron paramagnetic resonance spectra. Introducing a small amount of CeO<inf>2</inf> (～0.34 wt%) into the fluorophosphate base glass converted NBO and BO into ABO in the glass network, red-shifted the UV absorption edge, and decreased the optical density increment by almost half after radiation. As the total dose of gamma radiation increased, the transmittance of the irradiated glass at a wavelength of 385 nm significantly increased due to absorption of POHC2 defects. After exposure to 250 k of rad gamma irradiation, the corresponding optical density increment per centimeter thickness at 385 nm of the radiation-hard fluorophosphate glass that melted in the nitrogen, oxygen, and air atmospheres decreased from 1.839 to 1.388 and 1.215. As it melted in air, the NBO ratio of the fluorophosphate glass reached the lowest level and the Ce<sup>4+</sup> ratio in the glass was 92.49%, which helped suppress the generation of POHC, Fe<sup>3+</sup>, PO<inf>4</inf>-EC, and PO<inf>3</inf>-EC defects during the gamma irradiation process, improving the glass's radiation resistance.<br/></div> © 2021 Elsevier Ltd and Techna Group S.r.l.

Number of references:61

Main heading:Nitrogen

Controlled terms:Cerium oxide - Density (optical) - Oxygen - Paramagnetic resonance - Radiation effects - Fourier transform infrared spectroscopy - Irradiation - Gamma rays - Density measurement (optical) - Optical glass - Color centers - Melting

Uncontrolled terms:$gamma@-radiation - CeO$-2$ - Fluorophosphate glass - Gamma irradiation - Glass melting atmosphere - Melting atmosphere - Optical- - Property - Radiation hard - Radiation resistance

Classification code:701.2 Magnetism: Basic Concepts and Phenomena - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 801 Chemistry - 802.3 Chemical Operations - 804 Chemical Products Generally - 804.2 Inorganic Compounds - 812.3 Glass - 931.3 Atomic and Molecular Physics - 932.1 High Energy Physics - 933.1 Crystalline Solids

Numerical data indexing:Percentage 9.249E+01%, Size 3.85E-07m

DOI:10.1016/j.ceramint.2021.04.256

Funding details: Number: 11972313,61775235, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: XAB2016A08, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2017446, Acronym: -, Sponsor: Youth Innovation Promotion Association of the Chinese Academy of Sciences;Number: 2021GY-251, Acronym: -, Sponsor: Shanxi Provincial Key Research and Development Project;

Funding text:This work is financially supported by the National Natural Science Foundation of China (NSFC No. 61775235 , 11972313 ), West Young Scholars Program of the Chinese Academy of Sciences ( XAB2016A08 ), Shaanxi Provincial Key Research and Development Program ( 2021GY-251 ), and Youth Innovation Promotion Association, CAS ( 2017446 ).

Database:Compendex

Accession number:20213310759591

Title:Semi-supervised LDA Based Method for Similarity Distance Metric Learning (Open Access)

Authors:Deng, Ren (1); Chen, Yaxuan (2); Han, Ruilin (1); Xiao, Han (1); Li, Xijie (3)

Author affiliation:(1) Amazingx Academy, China; (2) School of Computer Science, Wuhan Donghu University, Wuhan, China; (3) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xian, China

Source title:ACM International Conference Proceeding Series

Abbreviated source title:ACM Int. Conf. Proc. Ser.

Part number:1 of 1

Issue title:Proceedings of the 4th International Conference on Information Science and Systems, ICISS 2021

Issue date:March 17, 2021

Publication year:2021

Pages:97-101

Language:English

ISBN-13:9781450389136

Document type:Conference article (CA)

Conference name:4th International Conference on Information Science and Systems, ICISS 2021

Conference date:March 17, 2021 - March 19, 2021

Conference location:Virtual, Online, United kingdom

Conference code:170693

Publisher:Association for Computing Machinery

Abstract:<div data-language="eng" data-ev-field="abstract">In recent years, computer vision technology has drawn much attention of people and been applied into many fields of human's living. Data classification/identification is a key task in computer vision. The similarity distance metric learning based method is wildly used to compare the similar positive pairs from dissimilar negative pairs. However, there are more and more challenging computer vision task have been proposed. Traditional similarity distance metric learning methods are fail to metric the similarity of these task due to the drastic variation of feature caused by illumination, view angle, pose and background changes. Thus, the existing methods are unable to learn effective and complete patterns to describe the appearance change of individuals. To overcome this problem, we proposed a novel semi-supervised (Linear Discriminant Analysis) LDA based method for similarity distance metric learning. The proposed method first learn a metric projection with traditional LDA method. The then test data are identified with the potential positive pairs to fine-turning the metric model by forcing the identified data to be close to the center of positive training data pairs. Finally, the proposed method are compared to some classic metric learning algorithms to demonstrate its effectiveness and accuracy.<br/></div> © 2021 ACM.

Number of references:25

Main heading:Computer vision

Controlled terms:Learning systems - Discriminant analysis - Learning algorithms

Uncontrolled terms:Computer vision technology - Data classification - Fine turning - Linear discriminant analysis - Metric projection - Semi-supervised - Similarity distance - Training data

Classification code:723.4.2 Machine Learning - 723.5 Computer Applications - 741.2 Vision - 903.1 Information Sources and Analysis - 922 Statistical Methods

DOI:10.1145/3459955.3460606

Database:Compendex

Open Access type(s): All Open Access, Bronze

Accession number:20210209741076

Title:Theoretical and Experimental Analysis of the Directional RI Sensing Property of Tilted Fiber Grating (Open Access)

Authors:Sun, Yuezhen (1); Lu, Tean (1); Moreno, Yarien (1); Li, Liangye (1); Wang, Hushan (2); Zhou, Kaiming (3); Sun, Qizhen (1); Liu, Deming (1); Yan, Zhijun (1); Zhang, Lin (3)

Author affiliation:(1) School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, China; (2) State Key Laboratory of Transient Optics and Photonics, Chinese Academy of Sciences, Xi'An Institute of Optics and Precision Mechanics, Xi'an, China; (3) Aston Institute of Photonic Technologies, Aston University, Birmingham, United Kingdom

Corresponding author:Yan, Zhijun(yanzhijun@hust.edu.cn)

Source title:Journal of Lightwave Technology

Abbreviated source title:J Lightwave Technol

Volume:39

Issue:2

Issue date:January 15, 2021

Publication year:2021

Pages:674-681

Article number:9210176

Language:English

ISSN:07338724

E-ISSN:15582213

CODEN:JLTEDG

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:In this article, we have theoretically and experimentally investigated the unique vector refractive index (RI) sensing property of tilted fiber grating (TFG). Due to the orthogonal symmetric grating structure, TFGs would mainly achieve the coupling between the fiber core mode and the two orthogonal polarization LP1m of cladding mode. And the numerical simulation results showed that the coupling coefficient between fundamental core mode to the LP1m cladding mode is higher than the others. In the experiment, we have furthermore observed the cladding mode field distribution of excessively TFG (Ex-TFG) and long period fiber grating (LPFG), which indicated that the evanescent field distribution of cladding mode of TFG shows an asymmetric near field distribution with two lobes oriented along the fast axis of TFG, and the one of LPFG has a circularly symmetric cladding mode field distribution. In addition, by employing side-immersion method, we have measured the azimuth RI sensitivities of Ex-TFG, tilted fiber Bragg grating (TFBG) and LPFG, which exhibited that both Ex-TFG and TFBG have shown a direction-dependency RI sensitivity, and the RI sensitivity with side-immersion along fast axis is almost half of the one along slow axis, and the RI sensitivity of LPFG is azimuth independent. Overall, the experiment results show that the TFGs inherently show unique directional RI sensing property, which could be potentially applied in vector sensing area.<br/> © 1983-2012 IEEE.

Number of references:38

Main heading:Evanescent fields

Controlled terms:Refractive index - Cladding (coating) - Fiber Bragg gratings

Uncontrolled terms:Coupling coefficient - Experimental analysis - Fundamental core mode - Long period fiber grating - Near-field distribution - Orthogonal polarizations - Tilted fiber Bragg grating - Tilted fiber gratings

Classification code:701 Electricity and Magnetism - 741.1 Light/Optics

DOI:10.1109/JLT.2020.3027947

Funding details: Number: 2019AAA053,2019AAA059, Acronym: -, Sponsor: -;Number: 872049, Acronym: H2020, Sponsor: Horizon 2020 Framework Programme;Number: 61922033, Acronym: IUSS, Sponsor: National Outstanding Youth Science Fund Project of National Natural Science Foundation of China;Number: 2018CFA004, Acronym: -, Sponsor: Natural Science Foundation of Hubei Province;Number: 2018YFB2100902, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Funding text:Manuscript received July 20, 2020; revised September 17, 2020; accepted September 28, 2020. Date of publication September 30, 2020; date of current version January 15, 2021. This work was supported in part by the National Science Fund for Excellent Young Scholars under Grant 61922033; in part by the National Key Research and Development Program of China under Grant 2018YFB2100902; in part by the Major Projects of Technical Innovation of Hubei under Grant 2019AAA053 and Grant 2019AAA059, and in part by the Creative Research Groups of the Nature Science Foundation of Hubei Province under Grant 2018CFA004. (Corresponding author: Zhijun Yan.) Yuezhen Sun, Tean Lu, Yarien Moreno, and Liangye Li are with the School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China (e-mail: yz_sun@hust.edu.cn; 547109009@qq.com; 3337198553@qq.com; liangyeli@hust.edu.cn).

Database:Compendex

Open Access type(s): All Open Access, Green

Accession number:20210609892037

Title:Research on the Quantitative Analysis Method of Nitrate in Complex Water by Full Scale Spectrum With GS-SVR

Title of translation:精细全光谱结合GS-SVR的复杂水体硝酸盐分析方法研究

Authors:Lei, Hui-Ping (1, 2); Hu, Bing-Liang (1); Yu, Tao (1); Liu, Jia-Cheng (1); Li, Wei (1, 2); Wang, Xue-Ji (1); Zou, Yan (3); Shi, Qian (3)

Author affiliation:(1) Xi'an Institute of Optics and Precision Machanics, Chinese Academy Sciences, Xi'an; 710119, China; (2) Photoelectical Engineering Institute, University of Chinese Academy Sciences, Beijing; 100049, China; (3) Institute of Oceanographic Instrumentation, Shandong Academy of Sciences, Qingdao; 266000, China

Corresponding author:Yu, Tao(yutao@opt.ac.cn)

Source title:Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis

Abbreviated source title:Guang Pu Xue Yu Guang Pu Fen Xi

Volume:41

Issue:2

Issue date:February 2021

Publication year:2021

Pages:372-378

Language:Chinese

ISSN:10000593

CODEN:GYGFED

Document type:Journal article (JA)

Publisher:Science Press

Abstract:Nitrate is an important index of water quality monitoring. The high concentration of nitrate in water results in the decrease of biodiversity and the degradation of the ecosystem. Meanwhile, it will cause irreversible harm to human health. Water quality monitoring technology based on the spectrum is the trend of modern water environment monitoring. Compared with the traditional method, nitrate field sampling and laboratory analysis, it has the advantages of simple operation, no pretreatment, fast detection, good repeatability and no pollution. Due to the complexity and diversity of water components, there is a high degree of nonlinearity between water parameters and absorbance. Traditional linear regression prediction models are not applicable, such as single wavelength method, dual wavelength method and partial least square method. Therefore, this paper proposes a new method for the determination of nitrate in water by fine full spectrum combined with the improved variable step grid search algorithm optimized support vector regression (GS-SVR). In cooperation with the college of chemistry and chemical engineering of Shaanxi University of Science and Technology, 94 groups of solution samples with different concentrations were prepared according to different concentration gradients and the experimental requirements by using standard nitrate solution, platinum cobalt standard solution and formazine standard suspension. Firstly, the transmittance spectrum was converted to absorbance, and 94 solution samples were divided into 80 training sets and 14 test sets by Kennard stone algorithm. Secondly, the improved GS algorithm combined with 5-fold cross validation is used to optimize the parameters of SVR by reducing the search range and changing the search step for many times, and the optimal penalty parameters and kernel function width are used to build model, which is used to predict the test set. Meanwhile, the prediction results are compared with those of BPNN, SVR, GS-SVR, PSO-SVR and GA-SVR. The results show that the coefficient of determination R<sup>2</sup>=0.993 5, root means square of prediction RMSEP=0.043 5. The optimal parameters are (512, 0.044 2), and the average training time is 13 s. Compared with the above five prediction models, R<sup>2</sup> increased by 1.22%, 11.66%, 0.78%, 0.74%, 0.77%, training efficiency increased by 4.15 times (BPNN), 8.30 times (GS-SVR), 21.38 times (PSO-SVR), 10.23 times (GA-SVR). The prediction accuracy and training efficiency of the model has been greatly improved, which provides a novel approach basis for rapid and real-time online monitoring of nitrate concentration in the complex water body. This method is also suitable for the establishment prediction models of other water quality parameters.<br/> © 2021, Peking University Press. All right reserved.

Number of references:11

Main heading:Forecasting

Controlled terms:Efficiency - Nitrates - Particle swarm optimization (PSO) - Water quality - Regression analysis - Suspensions (fluids) - Water pollution - Biodiversity - Least squares approximations

Uncontrolled terms:Coefficient of determination - Concentration gradients - Degree of non-linearity - Experimental requirements - Kennard-Stone algorithm - Partial least square methods - Water quality monitoring - Water quality parameters

Classification code:445.2 Water Analysis - 453 Water Pollution - 454 Environmental Engineering - 723 Computer Software, Data Handling and Applications - 804 Chemical Products Generally - 804.2 Inorganic Compounds - 913.1 Production Engineering - 921.5 Optimization Techniques - 921.6 Numerical Methods - 922.2 Mathematical Statistics

Numerical data indexing:Percentage 1.17e+01%, Percentage 1.22e+00%, Percentage 7.40e-01%, Percentage 7.70e-01%, Percentage 7.80e-01%, Time 1.30e+01s

DOI:10.3964/j.issn.1000-0593(2021)02-0372-07

Database:Compendex

Accession number:20212010346866

Title:Effective strategy to achieve a metal surface with ultralow reflectivity by femtosecond laser fabrication

Authors:Li, Xun (1, 2); Li, Ming (1); Liu, Hongjun (1, 3)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics of CAS, Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China

Corresponding authors:Li, Ming(liming@opt.ac.cn); Liu, Hongjun(liuhongjun@opt.ac.cn)

Source title:Chinese Optics Letters

Abbreviated source title:Chin. Opt. Lett.

Volume:9

Issue:5

Issue date:April 10, 2021

Publication year:2021

Article number:051401

Language:English

ISSN:16717694

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">An effective and simple method is proposed for fabricating the micro/nano hybrid structures on metal surfaces by adjusting femtosecond laser fluence, scanning interval, and polarization. The evolution of surface morphology with the micro/nano structures is discussed in detail. Also, the mechanism of light absorption by the micro/nano hybrid structures is revealed. Compared with the typical periodic light-absorbing structures, this type of micro/nano hybrid structures has an ultralow average reflectivity of 2% in the 250–2300 nm spectral band and the minimum 1.5% reflectivity in UV band. By employing this method, large areas of the micro/nano hybrid structures with high consistency could be achieved.<br/></div> © 2021 Chinese Optics Letters

Number of references:38

Main heading:Reflection

Controlled terms:Femtosecond lasers - Surface morphology - Fabrication - Light absorption - Morphology - Titanium alloys

Uncontrolled terms:Absorbing structure - Hybrid structure - Metal surfaces - Micro/nano - Micro/nanostructures - Scanning intervals - SIMPLE method - Spectral band

Classification code:542.3 Titanium and Alloys - 741.1 Light/Optics - 744.1 Lasers, General - 931.2 Physical Properties of Gases, Liquids and Solids - 951 Materials Science

Numerical data indexing:Percentage 1.50e+00%, Percentage 2.00e+00%

DOI:10.3788/COL202119.051401

Funding details: Number: 2018zdzx01-03-01, Acronym: -, Sponsor: -;Number: 2018YFB1107404, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;Number: S2019-YF-ZDCXL-ZDLGY-0253,S2020-YF-ZDCXL-ZDLGY-0021, Acronym: -, Sponsor: Shanxi Provincial Key Research and Development Project;

Funding text:This work was supported by the National Key R&D Program (No. 2018YFB1107404), the Major Scientific and Technological Projects in Shaanxi Province (No. 2018zdzx01-03-01), and the Key Research and Development Program of Shaanxi Province (Nos. S2019-YF-ZDCXL-ZDLGY-0253 and S2020-YF-ZDCXL-ZDLGY-0021).

Database:Compendex

Accession number:20205209674760

Title:Precise on-Fiber Plasmonic Spectroscopy Using a Gradient-Index Microlens

Authors:Jia, Peipei (1, 5); Kong, Depeng (2); Li, Jiawen (3); Schartner, Erik (4); Ebendorff-Heidepriem, Heike (4)

Author affiliation:(1) ARC Centre of Excellence for Nanoscale BioPhotonics, Institute for Photonics and Advanced Sensing, School of Physical Sciences, The University of Adelaide, Adelaide, Australia; (2) Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics of CAS (XIOPM), Shannxi, China; (3) CNBP, IPAS, Adelaide Medical School, The University of Adelaide, Adelaide, Australia; (4) CNBP, IPAS, School of Physical Sciences, The University of Adelaide, Adelaide, Australia; (5) Shenzhen Topmembrane Technology Co., Ltd., Shenzhen; 518000, China

Corresponding author:Kong, Depeng(kongdp@opt.ac.cn)

Source title:Journal of Lightwave Technology

Abbreviated source title:J Lightwave Technol

Volume:39

Issue:1

Issue date:January 1, 2021

Publication year:2021

Pages:270-274

Article number:9205196

Language:English

ISSN:07338724

E-ISSN:15582213

CODEN:JLTEDG

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:Plasmonic spectroscopy has emerged as a powerful technique for interrogation of light in the subwavelength regime. Realization of active plasmonic elements on optical fibers can simplify the optical design, allow for performing remote tasks and thus extend the scope of plasmonic utilization. However, the optimization of fiber optics for improving the plasmonic excitation condition has been overlooked. Here we present a plasmonic spectroscopy platform that combines a gradient-index microlens and a single-mode optical fiber. This design ensures large-area and uniform illumination in normal incidence for the excitation of surface plasmon resonance. We demonstrate precise plasmonic spectroscopy with a fiber-optic platform by patterning a nanohole array onto the facet of a gradient-index microlens with our template transfer technique. The experimental spectra are almost identical to the simulated results under ideal conditions, with accurate resonance wavelength (<10 nm deviation), high sensitivity (5 nm/RIU deviation), narrow linewidth (about 5 nm deviation), and diverse shifting patterns. This platform provides a fiber-optic avenue of precise plasmonic spectroscopy for remote interrogation.<br/> © 1983-2012 IEEE.

Number of references:22

Main heading:Plasmonics

Controlled terms:Microlenses - Optical fibers - Surface plasmon resonance - Fiber optics - Optical design

Uncontrolled terms:Excitation conditions - Experimental spectra - Narrow-line width - Resonance wavelengths - Shifting patterns - Single-mode optical fiber - Transfer technique - Uniform illumination

Classification code:741.1 Light/Optics - 741.1.2 Fiber Optics - 741.3 Optical Devices and Systems - 932.3 Plasma Physics

Numerical data indexing:Size 5.00e-09m

DOI:10.1109/JLT.2020.3026365

Funding details: Number: 102093, Acronym: -, Sponsor: -;Number: CE14010003, Acronym: CNBP, Sponsor: ARC Centre for Nanoscale BioPhotonics;Number: -, Acronym: CAS, Sponsor: Chinese Academy of Sciences;

Funding text:Manuscript received July 23, 2020; revised September 11, 2020; accepted September 13, 2020. Date of publication September 24, 2020; date of current version January 2, 2021. This work research was supported by the ARC Centre of Excellence for Nanoscale BioPhotonics under Grant CE14010003 and CAS Scholarship. The work of J. Li was supported by the National Heart Foundation Postdoctoral Fellowship under Grant 102093. (Corresponding authors: Depeng Kong.) Peipei Jia is with the ARC Centre of Excellence for Nanoscale BioPhotonics and Institute for Photonics and Advanced Sensing, School of Physical Sciences, The University of Adelaide, Adelaide 5005, Australia, and also with the Shen-zhen Topmembrane Technology Co., Ltd., Shenzhen 518000, China (e-mail: jpp1021@topmembranes.com).

Database:Compendex

Accession number:20203909248807

Title:Local and correlation attention learning for subtle facial expression recognition

Authors:Wang, Shaocong (1, 2); Yuan, Yuan (3); Zheng, Xiangtao (1); Lu, Xiaoqiang (1)

Author affiliation:(1) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; Shaanxi; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Center for OPTical IMagery Analysis and Learning(OPTIMAL), Northwestern Polytechnical University, Xi'an; 710072, China

Corresponding author:Zheng, Xiangtao(xiangtaoz@gmail.com)

Source title:Neurocomputing

Abbreviated source title:Neurocomputing

Volume:453

Issue date:September 17, 2021

Publication year:2021

Pages:742-753

Language:English

ISSN:09252312

E-ISSN:18728286

CODEN:NRCGEO

Document type:Journal article (JA)

Publisher:Elsevier B.V.

Abstract:<div data-language="eng" data-ev-field="abstract">Subtle facial expression recognition (SFER) aims to classify facial expressions with very low intensity into corresponding human emotions. Subtle facial expression can be regarded as a special kind of facial expression, whose facial muscle movements are more difficult to capture. In the last decade, various methods have been developed for common facial expression recognition (FER). However, most of them failed to automatically find the most discriminative parts of facial expression and the correlation of muscle movements when human makes facial expression, which makes them unsuitable for SFER. To better solve SFER problem, an attention mechanism based model focusing on salient local regions and their correlations is proposed in this paper. The proposed method: 1) utilizes multiple attention blocks to attend to distinct discriminative regions and extract corresponding local features automatically, 2) a correlation attention module is integrated in the model to extract global correlation feature over the salient regions, and finally 3) fuses the correlation feature and local features in an efficient way for the final facial expression classification. By this way, the useful but subtle local information can be utilized in more detail, and the correlation of different local regions is also extracted. Extensive experiment on the LSEMSW and CK+ datasets shows that the method proposed in this paper achieves superior results, which demonstrates its effectiveness.<br/></div> © 2020 Elsevier B.V.

Number of references:52

Main heading:Emotion Recognition

Controlled terms:Face recognition - Muscle - Neural networks

Uncontrolled terms:Attention mechanisms - Correlation features - Facial expression classification - Facial expression recognition - Facial Expressions - Global correlation - Local information - Muscle movement

Classification code:461.2 Biological Materials and Tissue Engineering - 723.2 Data Processing and Image Processing

DOI:10.1016/j.neucom.2020.07.120

Funding details: Number: 61632018,61702498,61772510,61806193, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 61825603,QYZDB-SSW-JSC015,XAB2017B15,XAB2017B26, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2017YFB0502900, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;Number: 61925112, Acronym: -, Sponsor: National Science Fund for Distinguished Young Scholars;Number: -, Acronym: -, Sponsor: National Defense Science and Technology Innovation Fund of the Chinese Academy of Sciences;

Funding text:This work was supported in part by the National Natural Science Found for Distinguished Young Scholars under Grant 61925112, in part by the National Key R&D Program of China under Grant 2017YFB0502900, in part by the National Natural Science Foundation of China under Grant 61806193, Grant 61702498, and Grant 61772510, in part by the Young Top-Notch Talent Program of Chinese Academy of Sciences under Grant QYZDB-SSW-JSC015, in part by the CAS "Light of West China" Program under Grant XAB2017B26, and Grant XAB2017B15, in part by the National Natural Science Found for Distinguished Young Scholars under Grant 61825603, in part by the State Key Program of National Natural Science of China under Grant 61632018, in part by the National Defense Science and Technology Innovation Special Zone Project.

Database:Compendex

Accession number:20200107963384

Title:Distribution equalization learning mechanism for road crack detection

Authors:Fang, Jie (1, 2); Qu, Bo (1); Yuan, Yuan (3)

Author affiliation:(1) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; Shaanxi; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Center for OPTical IMagery Analysis and Learning (OPTIMAL), Northwestern Polytechnical University, Xi'an; 710072, China

Corresponding author:Fang, Jie(jackfang713508@gmail.com)

Source title:Neurocomputing

Abbreviated source title:Neurocomputing

Volume:424

Issue date:February 1, 2021

Publication year:2021

Pages:193-204

Language:English

ISSN:09252312

E-ISSN:18728286

CODEN:NRCGEO

Document type:Journal article (JA)

Publisher:Elsevier B.V.

Abstract:Visual-based road crack detection becomes a hot research topic over the last decade because of its huge application demands. Road crack detection is actually a special form of salient object detection task, whose objects are small and distribute randomly in the image compared to the traditional ones, which increase the difficulty of detecting. Most conventional methods utilize bottom information, such as color, texture, and contrast, to extract the crack regions in the image. Even though these methods can achieve satisfactory performances for images with simple scenarios, they are easily interfered by some factors such as light and shadow, which may decrease the detection result directly. Inspired by the competitive performances of deep convolutional neural networks on many visual tasks, we propose a distribution equalization learning mechanism for road crack detection in this paper. Firstly, we consider the crack detection task as a pixel-level classification and use a U-Net based architecture to finalize it. Secondly, the occurrence probability of crack and non-crack are so different, which results in the ill-conditioned classifier and undesirable detection performance, especially the high false detection rate. In this case, we propose a weighted cross entropy loss term and a data augmentation strategy to avoid influence from imbalanced samples through emphasizing the crack regions. Additionally, we propose an auxiliary interaction loss, and combine it with the popular self-attention strategy to alleviate the fracture situations through considering relationships among different local regions in the image. Finally, we tested the proposed method on three public and challenging datasets, and the experimental results demonstrate its effectiveness.<br/> © 2019

Number of references:54

Main heading:Textures

Controlled terms:Vision - Object detection - Equalizers - Crack detection - Deep neural networks - Object recognition - Roads and streets

Uncontrolled terms:Competitive performance - Conventional methods - Detection performance - Hot research topics - Ill-conditioned - Learning mechanism - Occurrence probability - Salient object detection

Classification code:406.2 Roads and Streets - 461.4 Ergonomics and Human Factors Engineering - 713.5 Electronic Circuits Other Than Amplifiers, Oscillators, Modulators, Limiters, Discriminators or Mixers - 723.2 Data Processing and Image Processing

DOI:10.1016/j.neucom.2019.12.057

Funding details: Number: XAB2017B15, Acronym: -, Sponsor: -;Number: 61632018, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 61806193, Acronym: -, Sponsor: -;Number: -, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: QYZDB-SSW-JSC015, Acronym: -, Sponsor: Chinese Academy of Sciences Key Technology Talent Program;Number: 61825603, Acronym: -, Sponsor: National Science Fund for Distinguished Young Scholars;

Funding text:This work was supported in part by the National Science Fund for Distinguished Young Scholars under Grant 61825603, in part by the State Key Program of National Natural Science Foundation of China under Grant 61632018 , in part by the National Key R&D Program of China under Grant 2017YFB0502900, in part by the National Natural Science Foundation of China under Grant 61925112 , Grant 61806193 , and Grant 61772510 , in part by the Young Top-Notch Talent Program of Chinese Academy of Sciences under Grant QYZDB-SSW-JSC015, in part by the CAS "Light of West China" Program under Grant XAB2017B15. Jie Fang Received B.S. degree in school of electronic engineering from XiDian University, Xi’an 710126, Shaanxi, P. R. China in 2015. He is currently pursuing the Ph.D degree in signal and information processing techniques with the Key Laboratory of Spectral Imaging Technology CAS, Xi,an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi,an 710119, Shaanxi, P. R. China and with the University of Chinese Academy of Sciences, Beijing 100049, P. R. China. His research interests include Artificial intelligence, Machine Learning and Image Understanding. Bo Qu is with the Key Laboratory of Spectral Imaging Technology CAS, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, Shaanxi, P. R. China. His research interests include Image Processing, Artificial Intelligence and Machine Learning. Yuan Yuan (M’05-SM’09) is currently a Full Professor with the Center for OPTical IMagery Analysis and Learning (OPTIMAL), Northwestern Polytechnical University, Xi’an 710072, P. R. China. Her current research interests include Visual Information Processing and Image/Video Content Analysis.

Database:Compendex

Accession number:20210809943896

Title:Infrared and visible image fusion based on weighted variance guided filter and image contrast enhancement

Authors:Ren, Long (1, 2, 3); Pan, Zhibin (2, 5, 6); Cao, Jianzhong (1); Liao, Jiawen (1, 2, 3); Wang, Yang (4, 5)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) Faculty of Electronics and Communications, Xi'an Jiaotong University, Xi'an; 710049, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China; (4) Department of Information Science, Xi'an University of Technology, Xi'an; 710048, China; (5) Research Institute of Xi'an Jiaotong University, Zhejiang; 311215, China; (6) State Key Laboratory of Novel Software Technology, Nanjing University, Nanjing, China

Corresponding author:Ren, Long(renlong513@stu.xjtu.edu.cn)

Source title:Infrared Physics and Technology

Abbreviated source title:Infrared Phys Technol

Volume:114

Issue date:May 2021

Publication year:2021

Article number:103662

Language:English

ISSN:13504495

CODEN:IPTEEY

Document type:Journal article (JA)

Publisher:Elsevier B.V.

Abstract:With extraordinary advances in sensor technology, infrared and visible image fusion has been widely used in both military and civilian applications. In this paper, we propose a novel image fusion method based on decomposition and division based strategy. The proposed method improves the guided filter to better decompose images and restrict artifacts around image boundaries. Furthermore, because the quality of visible images is easily affected by low light conditions and noises, it is necessary to enhance the contrast of visible images to improve the visual quality before applying image fusion. Subsequently, we divide the infrared and visible image into several sub-images in vertical direction, because there is more similar image content in this direction such as the sky and land. Additionally, each sub-image is decomposed into a base layer and a detail layer. Different from previous methods, the fusion in our proposed method is executed by two different strategies, one takes the sub infrared base layer as the main image to get the fusion result, while the other one takes the sub visible base layer as the main image, and two different sub-fusion results are obtained. We also propose a new fusion strategy called gradient-brightness criterion to adaptively output the final fused image. As a result, the fused image preserves more details of visible image and clearer infrared objects at the same time, which is well suited for human visual perception. Experimental results indicate that our proposed method achieves a superior performance compared with previous fusion methods in both subjective and objective assessments.<br/> © 2021 Elsevier B.V.

Number of references:47

Main heading:Image fusion

Controlled terms:Military applications - Military photography - Image enhancement

Uncontrolled terms:Human visual perception - Image contrast enhancement - Image fusion methods - Infrared and visible image - Low light conditions - Objective assessment - Sensor technologies - Vertical direction

Classification code:404.1 Military Engineering - 723.2 Data Processing and Image Processing - 742.1 Photography

DOI:10.1016/j.infrared.2021.103662

Funding details: Number: 2018225, Acronym: -, Sponsor: -;Number: -, Acronym: XJTU, Sponsor: Xi’an Jiaotong University;Number: KFKT2019B26, Acronym: NJU, Sponsor: Nanjing University;Number: -, Acronym: -, Sponsor: State Key Laboratory of Novel Software Technology;Number: 2020GY-005, Acronym: -, Sponsor: Key Science and Technology Program of Shaanxi Province;

Funding text:This work was supported by the major Science Program of Research Institute of Xi'an Jiaotong University from Xiaoshan District, Hangzhou, Zhejiang under Grand No.2018225, the Open Project Program of State Key Laboratory of Novel Software Technology (Nanjing University) (Grant No. KFKT2019B26) and the Key Science and Technology Program of Shaanxi Province (Grant No. 2020GY-005).

Database:Compendex

Accession number:20210309787605

Title:Numerical study of the influence of thermal radiation on measuring semi-transparent thermal insulation material with hot wire method

Authors:Zhang, H. (1); Ma, Y.X. (2); Wang, X. (1); Tang, G.H. (3)

Author affiliation:(1) State Key Laboratory for Strength and Vibration of Mechanical Structures, Shaanxi Key Laboratory of Environment and Control for Flight Vehicle, School of Aerospace Engineering, Xi'an Jiaotong University, Xi'an; 710049, China; (2) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, Xi'an Jiaotong University, Xi'an; 710049, China

Corresponding author:Zhang, H.(huzhang@xjtu.edu.cn)

Source title:International Communications in Heat and Mass Transfer

Abbreviated source title:Int. Commun. Heat Mass Transf.

Volume:121

Issue date:February 2021

Publication year:2021

Article number:105120

Language:English

ISSN:07351933

CODEN:IHMTDL

Document type:Journal article (JA)

Publisher:Elsevier Ltd

Abstract:Semi-transparent thermal insulation material has very low extinction coefficient and will transmit infrared spectrum within some wavelength range. When measuring the thermal conductivity (TC) of such kinds of material with transient methods, both heat conduction and thermal radiation occur within material. Transient hot wire (HW) method is a widely used method for thermal insulation measurement. It is developed with the assumption that heat only transfers via conduction. Since thermal radiation within low density thermal insulation material is a pronounced heat transfer mode at high temperature, the TC of radiation participating medium measured by HW method might be incorrect. To reveal the inconsistency between test theory and practical heat transfer process when measuring semi-transparent thermal insulation material with HW method, the transient conduction and radiation coupled heat transfer process is simulated numerically. The uncertainty caused by thermal radiation is investigated for material with different extinction coefficient at various temperature. The deviation increases with the increment of temperature and decreases with increment of extinction coefficient compared to results obtained from the one dimensional (1D) steady state method. The numerical analysis indicates that the TC of thermal insulation material with low extinction ability measured by HW method is overestimated at high temperature.<br/> © 2021 Elsevier Ltd

Number of references:27

Main heading:Heat radiation

Controlled terms:Heat transfer coefficients - Numerical methods - Thermal conductivity - Thermal insulation - Heat conduction - Thermal insulating materials - Wire

Uncontrolled terms:Coupled heat transfer - Extinction coefficients - Heat transfer process - Participating medium - Steady-state method - Thermal insulation materials - Transient conduction - Transient hot wire

Classification code:413.2 Heat Insulating Materials - 535.2 Metal Forming - 641.1 Thermodynamics - 641.2 Heat Transfer - 921.6 Numerical Methods

DOI:10.1016/j.icheatmasstransfer.2021.105120

Funding details: Number: BX20180244, Acronym: -, Sponsor: -;Number: 51825604, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2018M643641, Acronym: -, Sponsor: China Postdoctoral Science Foundation;Number: xjj2018029, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;

Funding text:This work was supported by the Innovative Talents Support Plan of China Postdoctoral Foundation (No. BX20180244 ), National Natural Science Foundation of China (No. 51825604 ), China Postdoctoral Science Foundation Funded Project (No. 2018M643641 ), and the Fundamental Research Funds for the Central Universities, China (No. xjj2018029 ).

Database:Compendex

Accession number:20210909996869

Title:Human behaviour recognition with mid-level representations for crowd understanding and analysis

Authors:Sun, Bangyong (1, 2); Yuan, Nianzeng (1); S., Li; S., Wu; N., Wang

Author affiliation:(1) College of Printing, Packaging Engineering and Digital Media, Xi'an University of Technology, Xi'an; Shaanxi; 710048, China; (2) The Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; Shaanxi; 710119, China; (3) University of Chinese Academy of Sciences, 19A Yuquanlu, Beijing; 100049, China; (4) School of Automation, Xi'an University of Posts & Telecommunications, Xi'an; Shaanxi; 710121, China

Corresponding authors:Wu, Siyuan(wusiyuan@opt.ac.cn); Li, Shuying(angle_lisy@163.com)

Source title:IET Image Processing

Abbreviated source title:IET Image Proc.

Volume:15

Issue:14

Issue date:December 2021

Publication year:2021

Pages:3414-3424

Language:English

ISSN:17519659

Document type:Journal article (JA)

Publisher:John Wiley and Sons Inc

Abstract:<div data-language="eng" data-ev-field="abstract">Crowd understanding and analysis have received increasing attention for couples of decades, and development of human behaviour recognition strongly supports the application of crowd understanding and analysis. Human behaviour recognition usually seeks to automatically analyse ongoing movements and actions in different camera views by using various machine learning methodologies in unknown video clips or image sequences. Compared to other data modalities such as documents and images, processing video data demands much higher computational and storage resources. The idea of using middle level semantic concepts to represent human actions from videos is explored and it is argued that these semantic attributes enable the construction of more descriptive methods for human action recognition. The mid-level attributes, initialized by a cluster processing, are built upon low level features and fully utilize the discrepancies in different action classes, which can capture the importance of each attribute for each action class. In this way, the representation is constructed to be semantically rich and capable of highly discriminative performance even paired with simple linear classifiers. The method is verified on three challenging datasets (KTH, UCF50 and HMDB51), and the experimental results demonstrate that our method achieves better results than the baseline methods on human action recognition.<br/></div> © 2021 The Authors. IET Image Processing published by John Wiley & Sons Ltd on behalf of The Institution of Engineering and Technology

Number of references:56

Main heading:Digital storage

Controlled terms:Data handling - Behavioral research - Semantics - Learning systems - Image processing

Uncontrolled terms:Baseline methods - Human-action recognition - Linear classifiers - Low-level features - Mid-level representation - Semantic attribute - Semantic concept - Storage resources

Classification code:461.4 Ergonomics and Human Factors Engineering - 722.1 Data Storage, Equipment and Techniques - 723.2 Data Processing and Image Processing - 971 Social Sciences

DOI:10.1049/ipr2.12147

Funding details: Number: LSIT201801D, Acronym: -, Sponsor: -;Number: 2017YFB0502900, Acronym: -, Sponsor: -;Number: 62076199, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 61701387,61806193,XAB2017B15, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2019M653784,61702498, Acronym: -, Sponsor: China Postdoctoral Science Foundation;

Funding text:This work was supported in part by National Natural Science Foundation of China under Grant 62076199, in part by the China Postdoctoral Science Foundation under Grant 2019M653784, in part by the National Natural Science Foundation of China under Grant 61702498, in part by the National Key R∖&D Program of China under Grant 2017YFB0502900, in part by the CAS Light of West China Program under Grant XAB2017B15, in part by the National Natural Science Foundation of China under Grant 61806193, in part by the National Natural Science Foundation of China under Grant 61701387, and in part by Key Laboratory of Spectral Imaging Technology of Chinese Academy of Sciences under Grant LSIT201801D.This work was supported in part by National Natural Science Foundation of China under Grant 62076199, in part by the China Postdoctoral Science Foundation under Grant 2019M653784, in part by the National Natural Science Foundation of China under Grant 61702498, in part by the National Key R?&D Program of China under Grant 2017YFB0502900, in part by the CAS Light of West China Program under Grant XAB2017B15, in part by the National Natural Science Foundation of China under Grant 61806193, in part by the National Natural Science Foundation of China under Grant 61701387, and in part by Key Laboratory of Spectral Imaging Technology of Chinese Academy of Sciences under Grant LSIT201801D.

Database:Compendex

Accession number:20212210436960

Title:Remote Sensing Image Generation from Audio

Authors:Zheng, Zhiyuan (1, 2); Chen, Jun (1); Zheng, Xiangtao (2); Lu, Xiaoqiang (2)

Author affiliation:(1) National Engineering Research Center for Multimedia Software, School of Computer Science, Wuhan University, Wuhan; 430072, China; (2) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China

Corresponding author:Zheng, Xiangtao(xiangtaoz@gmail.com)

Source title:IEEE Geoscience and Remote Sensing Letters

Abbreviated source title:IEEE Geosci. Remote Sens. Lett.

Volume:18

Issue:6

Issue date:June 2021

Publication year:2021

Pages:994-998

Article number:9094059

Language:English

ISSN:1545598X

E-ISSN:15580571

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">Generating image from other modal data has attracted much attention in cross-modal studies, since the generated image offers intuitive vision information. Unlike the previous works which generate an image from text, a novel task is introduced, generating an image from audio. However, semantic gap intrinsically exists in cross-modal data, which disturbs the generative results. In order to explore the relevance between the audio and image, a novel reranking audio-image translation method is proposed. The proposed method: 1) maps the audio and image into a uniform feature space; 2) designs an audio-audio matching network to match the related audio; and 3) adopts an audio-image matching network for every matched audio to generate a related image, and the most frequent image is voted as the final result. Extensive experiments on two remote sensing cross-modal data sets demonstrate that the proposed method can visualize the content of audio.<br/></div> © 2004-2012 IEEE.

Number of references:16

Main heading:Remote sensing

Controlled terms:Semantics - Modal analysis

Uncontrolled terms:Audio images - Audio matching - Cross-modal - Feature space - Matching networks - Remote sensing images - Semantic gap - Vision information

Classification code:921 Mathematics

DOI:10.1109/LGRS.2020.2992324

Funding details: Number: 61772510,61806193,61876135, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: QYZDB-SSW-JSC015,XAB2017B26, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2017YFB0502900, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;Number: 61925112, Acronym: -, Sponsor: National Science Fund for Distinguished Young Scholars;

Funding text:Manuscript received October 11, 2019; revised March 31, 2020; accepted April 21, 2020. Date of publication May 15, 2020; date of current version May 21, 2021. This work was supported in part by the National Natural Science Found for Distinguished Young Scholars under Grant 61925112, in part by the National Key Research and Development Program of China under Grant 2017YFB0502900, in part by the National Natural Science Foundation of China under Grant 61806193, Grant 61772510, and Grant 61876135, in part by the Young Top-Notch Talent Program of Chinese Academy of Sciences under Grant QYZDB-SSW-JSC015, and in part by the CAS "Light of West China" Program under Grant XAB2017B26. (Corresponding author: Xiangtao Zheng.) Zhiyuan Zheng is with the National Engineering Research Center for Multimedia Software, School of Computer Science, Wuhan University, Wuhan 430072, China, and also with the Key Laboratory of Spectral Imaging Technology CAS, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China.

Database:Compendex

Accession number:20213810904182

Title:Near-infrared image recovery based on modulation instability in CdZnTe:V (Open Access)

Authors:Liao, Yuan (1, 2); Wang, Zhaolu (1); Huang, Nan (1); Liu, Hongjun (1, 3)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100084, China; (3) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China

Corresponding author:Liu, Hongjun(liuhongjun@opt.ac.cn)

Source title:Optics Express

Abbreviated source title:Opt. Express

Volume:29

Issue:20

Issue date:September 27, 2021

Publication year:2021

Pages:31145-31155

Language:English

E-ISSN:10944087

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">We propose a near-infrared image recovery method based on modulation instability in the photorefractive semiconductor CdZnTe:V. The formation mechanism of modulation instability in CdZnTe:V is discussed, and the theoretical gain model is derived. Theoretical results of optical image recovery at 1 µm and 1.5 µm wavelengths demonstrate that the maximum cross-correlation gain is 2.6 with a signal to noise intensity ratio of 0.1. These results suggest that our method could be one of potential aids for near-infrared imaging.<br/></div> © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Number of references:41

Main heading:Signal to noise ratio

Controlled terms:Recovery - Modulation - Optical correlation - Infrared devices - Geometrical optics - Thermography (imaging)

Uncontrolled terms:Formation mechanism - Maximum cross correlations - Modulation instabilities - Near- infrared images - Near-infrared imaging - Optical image - Photo-refractive - Signal to noise

Classification code:716.1 Information Theory and Signal Processing - 741.1 Light/Optics - 742.1 Photography

DOI:10.1364/OE.438061

Funding details: Number: 61775234,61975232, Acronym: NNSFC, Sponsor: National Natural Science Foundation of China;

Funding text:National Natural Science Foundation of China (61775234, 61975232).

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20210509874590

Title:Simulation of non-line-of-sight imaging system based on the light-cone transform

Authors:Zhu, Wenhua (1, 2); Tan, Jingjing (1, 2); Ma, Caiwen (1); Su, Xiuqin (1)

Author affiliation:(1) Cas Key Laboratory of Space Precision Measurement, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, 17 Xinxi Road, Xi'an, Shaanxi; 710119, China; (2) University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing; 100049, China

Corresponding author:Su, Xiuqin(suxiuqin@opt.ac.cn)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11761

Part number:1 of 1

Issue title:Fourth International Conference on Photonics and Optical Engineering

Issue date:2021

Publication year:2021

Article number:1176121

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510643574

Document type:Conference article (CA)

Conference name:4th International Conference on Photonics and Optical Engineering

Conference date:October 15, 2020 - October 16, 2020

Conference location:Xi'an, China

Conference code:166676

Publisher:SPIE

Abstract:Non-line-of-sight (NLOS) imaging is an emerging technique, which can observe objects obscured by occluders. Thanks to the improvement of optical configurations, it is receiving growing interest from researchers. In this paper, we reconstruct both 2D and 3D images by adopting the light-cone transform and validated on simulated data. Numerical results are evaluated by structural similarity index (SSIM). The results showed the good performance of the algorithm in preserving the details of 2D image and reconstruction of 3D image. The structural similarity index of the reconstructed image and the reference image is more than 50%, the target is hence being identified. This work contributes to the construction of the real system.<br/> © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

Number of references:20

Main heading:Image reconstruction

Uncontrolled terms:Non-line-of-sight imaging - Nonline of sight - Numerical results - Optical configurations - Reconstructed image - Reference image - Structural similarity indices - Structural similarity indices (SSIM)

Classification code:741.1 Light/Optics

Numerical data indexing:Percentage 5.00e+01%

DOI:10.1117/12.2586651

Funding details: Number: GQRC-19-19, Acronym: -, Sponsor: -;

Funding text:This work has been supported by the High-tech Innovation Fund of the Chinese Academy of Sciences (GQRC-19-19).

Database:Compendex

Accession number:20212010365541

Title:Structure-Preserving Super-Resolution Reconstruction Based on Multi-residual Network

Title of translation:基于多残差网络的结构保持超分辨重建

Authors:Zhang, Mingjin (1, 2); Peng, Xiaoqi (1); Guo, Jie (1); Li, Yunsong (1); Wang, Nannan (1); Gao, Xinbo (1, 3)

Author affiliation:(1) State Key Laboratory of Integrated Services Networks, Xidian University, Xi'an; 710071, China; (2) Key Laboratory of Spectral Imaging Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) Chongqing Key Laboratory of Image Cognition, Chongqing University of Posts and Telecommunications, Chongqing; 400065, China

Corresponding author:Gao, Xinbo(gaoxb@cqupt.edu.cn)

Source title:Moshi Shibie yu Rengong Zhineng/Pattern Recognition and Artificial Intelligence

Abbreviated source title:Moshi Shibie yu Rengong Zhineng

Volume:34

Issue:3

Issue date:March 2021

Publication year:2021

Pages:232-240

Language:Chinese

ISSN:10036059

CODEN:MRZHET

Document type:Journal article (JA)

Publisher:Science Press

Abstract:<div data-language="eng" data-ev-field="abstract">Aiming at the problems of geometric structure distortion and missing details in image super-resolution reconstruction, a structure-preserving super-resolution reconstruction algorithm based on multi-residual network is proposed. Deep learning is carried out in the wavelet transform domain and the gradient domain. Three kinds of residual networks are introduced. The structure and the edge information are reconstructed by the residual gradient network. The high-frequency information of the image is reconstructed as a whole by the residual wavelet transform network. The network attention is adjusted by the residual channel attention network, the important channel features are emphatically learned, and the high frequency information of the image is recovered locally. Experiments show that the proposed algorithm achieves better performance in both quantitative results and visual effects.<br/></div> © 2021, Science Press. All right reserved.

Number of references:31

Main heading:Wavelet transforms

Controlled terms:Deep learning - Image reconstruction - Optical resolving power

Uncontrolled terms:Geometric structure - High-frequency informations - Image super-resolution reconstruction - Quantitative result - Residual gradient - Structure-preserving - Super resolution reconstruction - Wavelet-transform domain

Classification code:461.4 Ergonomics and Human Factors Engineering - 741.1 Light/Optics - 921.3 Mathematical Transformations

DOI:10.16451/j.cnki.issn1003-6059.202103005

Funding details: Number: 61902293, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 20200103, Acronym: SUST, Sponsor: Shaanxi University of Science and Technology;Number: -, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;Number: XJS200112, Acronym: -, Sponsor: -;Number: LSIT201901W, Acronym: -, Sponsor: -;

Funding text:收稿日期:2020-09-25;录用日期:2021-02-05 Manuscript received September 25, 2020; accepted February 5, 2021 国家自然科学基金青年基金项目(No.61902293)、陕西省高 校科协人才托举计划项目(No.20200103)、中国科学院光谱 成像技术重点实验室开放基金项目(No. LSIT201901W)、中 央基本科研业务费新教师创新项目(No. XJS200112)资助 Supported by Youth Fund of National Natural Science Foundation of China(No.61902293), Young Talent Fund of University As鄄 sociation for Science and Technology in Shaanxi(No.20200103), Open Research Fund of CAS Key Laboratory of Spectral Imaging Technology(No. LSIT201901W), Fundamental Research Funds for the Central Universities(No. XJS200112)Supported by Youth Fund of National Natural Science Foundation of China(No.61902293), Young Talent Fund of University Association for Science and Technology in Shaanxi(No.20200103), Open Research Fund of CAS Key Laboratory of Spectral Imaging Technology(No.LSIT201901W), Fundamental Research Funds for the Central Universities(No.XJS200112).

Database:Compendex

Accession number:20215011303033

Title:Nonlinear Full-Spectrum Quantitative Analysis Algorithm of Complex Water Based on IERT

Title of translation:基于IERT的非线性全光谱复杂水体定量分析算法研究

Authors:Liu, Jia-Cheng (1, 2); Hu, Bing-Liang (1); Yu, Tao (1); Wang, Xue-Ji (1); Du, Jian (1); Liu, Hong (1); Liu, Xiao (1); Huang, Qi-Xing (3)

Author affiliation:(1) Key Laboratory of Spectral Imaging Technique, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Shenzhen Yantian Port Group Co., Ltd., Shenzhen; 518081, China

Corresponding author:Yu, Tao(yutao@opt.ac.cn)

Source title:Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis

Abbreviated source title:Guang Pu Xue Yu Guang Pu Fen Xi

Volume:41

Issue:12

Issue date:December 2021

Publication year:2021

Pages:3922-3930

Language:Chinese

ISSN:10000593

CODEN:GYGFED

Document type:Journal article (JA)

Publisher:Science Press

Abstract:<div data-language="eng" data-ev-field="abstract">Water is a finite resource, essential for agriculture, industry and even human existence. A good water environment is an important guarantee for sustainable development. The scientific monitoring of water quality information is the basis for optimal allocation and efficient use of water resources. The United Nations Environment Program (UNEP) and the World Health Organization (WHO) pointed out that national water quality monitoring networks in developing countries should be strengthened, including improving analytical capabilities and data quality assurance. As an emerging water quality analysis method, spectral method has the characteristics of "fast response, synchronization of multiple parameters, environmental protection and pollution-free" compared with traditional chemical water quality monitoring methods. The traditional single-band, multi-band linear model, relies on the absorption characteristics of water at specific bands, and it cannot be used for multi-component mixed solutions and has poor universality. Therefore, this paper proposes a non-linear full-spectrum quantitative analysis algorithm based on IERT. The concentration prediction model suitable for multi-component mixed solution is established to use full spectrum information to predict concentration information. We use the COD, BOD<inf>5</inf>, TOC multi-component mixed solution and NO<inf>3</inf>-N, turbidity, chroma multi-component mixed solution configured in the laboratory as the experimental sample, use the spectrometer to collect the spectral curve of the sample, and conduct the concentration prediction experiment through the full spectrum data. The experimental results show that for COD, BOD<inf>5</inf>, TOC multi-component mixed solutions, the determination coefficients (R<sup>2</sup>) of this algorithm for the three components are 0.999 3, 0.991 4 and 0.999 3. The root means square error (RMSE) is 0.024 4, 0.057 7 and 0.000 4. For the multi-component mixed solution of NO<inf>3</inf>-N, turbidity, and colority, the coefficient of determination (R<sup>2</sup>) is 0.983 4, 0.868 4 and 0.981 0. The root means square error (RMSE) is 0.100 5, 0.326 4 and 0.120 2. By comparing the experimental results of this algorithm with partial least squares (PLS), support vector regression (SVR), decision tree (DT), and extreme random tree (ERT) for the same set of data, the results show that in the experiment of mixed solution, this algorithm is the best alternative to the coefficient of determination (R<sup>2</sup>) of each component.The root means square error (RMSE) has been greatly reduced compared with other comparison algorithms. This algorithm can use spectral information to analyze the multi-component mixed solution quantitatively. It can effectively improve the concentration prediction accuracy and reduce the root-mean-square error of the quantitative analysis in the case of equivalent calculation time. Moreover, this algorithm can provide a theoretical basis for spectral methods on water quality monitoring.<br/></div> © 2021, Peking University Press. All right reserved.

Number of references:14

Main heading:Ultraviolet visible spectroscopy

Controlled terms:Developing countries - Sustainable development - Turbidity - Water absorption - Water quality - Forecasting - Decision trees - Information systems - Quality control - Regression analysis - Least squares approximations - Data mining - Agriculture - Quality assurance - Spectrometers - Information use - Spectrum analysis - Support vector machines - Water pollution

Uncontrolled terms:Extreme random tree - Mixed solution - Multi-component mixed solution - Multicomponents - Random tree - Spectral quantitative analyse - Spectroscopic water quality monitoring - Spectroscopy technology - Ultraviolet visible spectroscopy technology - Ultraviolet-visible spectroscopy - Water quality monitoring

Classification code:445.2 Water Analysis - 453 Water Pollution - 723 Computer Software, Data Handling and Applications - 723.2 Data Processing and Image Processing - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 802.3 Chemical Operations - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 903.2 Information Dissemination - 903.3 Information Retrieval and Use - 913.3 Quality Assurance and Control - 921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory - 921.6 Numerical Methods - 922.2 Mathematical Statistics - 961 Systems Science

DOI:10.3964/j.issn.1000-0593(2021)12-3922-09

Database:Compendex

Accession number:20211010034322

Title:Optical design and simulation of Einstein Probe satellite follow-up X-ray telescope

Authors:Zhu, Yuxuan (1); Lu, Jingbin (1); Yang, Yangji (2); Cong, Min (2); Sheng, Lizhi (3); Qiang, Pengfei (3); Cui, Weiwei (2); Zhang, Ziliang (2); Wang, Yusa (2); Han, Dawei (2); Li, Wei (2); Wang, Juan (2); Huo, Jia (2); Li, Maoshun (2); Zhao, Xiaofan (2); Yu, Nian (2); Song, Zeyu (2); Ma, Jia (2); Lv, Zhonghua (2); Zhao, Zijian (2); Wang, Hao (2); Hou, Dongjie (2); Chen, Can (2); Chen, Tianxiang (2); Yang, Xiongtao (2); Luo, Laidan (2); Lu, Bing (2); Xu, Jingjing (2); Chen, Yehai (4); Chen, Yong (2)

Author affiliation:(1) Jilin University, College of Physics, Changchun, Jilin, China; (2) Chinese Academy of Sciences, Institute of High Energy Physics, Key Laboratory of Particle Astrophysics, Beijing, China; (3) Xi'an Institute of Optics and Precision Mechanics, State Key Laboratory of Transient Optics and Photonics, Xi'an, China; (4) Chinese Academy of Sciences, Innovation Academy for Microsatellites, Shanghai, China

Source title:Optical Engineering

Abbreviated source title:Opt Eng

Volume:60

Issue:2

Issue date:February 1, 2021

Publication year:2021

Article number:025102

Language:English

ISSN:00913286

E-ISSN:15602303

CODEN:OPEGAR

Document type:Journal article (JA)

Publisher:SPIE

Abstract:The Follow-up X-ray Telescope (FXT), a key payload onboard the Einstein Probe sallite (EP), is equipped with a Wolter-I X-ray focusing mirror system. We introduce the principle of such a mirror system and analyze the influence of the mirror gap in the multishell nested mirror of the FXT on the effective area, stray-light ratio, and vignetting. To ensure that no occlusion occurs within adjacent shells and minimize stray-light ratio, the size of the gap is set to a optimized value for corresponding shell. We finished a design of a 54-shell mirror system according to these results. The optical performance of the design was then simulated using a Monte Carlo algorithm and the ray-tracing principle. The simulation shows that the effective area is 414.5 ± 0.2 cm2 at 1.25 keV (considering the spider), and the field of view is 64 arcmin in diameter. These parameters meet the optical requirements of the FXT.<br/> © 2021 Society of Photo-Optical Instrumentation Engineers (SPIE).

Number of references:26

Main heading:Probes

Controlled terms:Mirrors - Telescopes - Ray tracing - Stray light - Gamma rays - Optical design

Uncontrolled terms:Design and simulation - Field of views - Mirror systems - Monte carlo algorithms - Optical performance - Tracing principle - X ray telescope - X-ray focusing mirror

Classification code:741.1 Light/Optics - 741.3 Optical Devices and Systems - 931.3 Atomic and Molecular Physics - 932.1 High Energy Physics

Numerical data indexing:Electron_Volt 1.25e+03eV

DOI:10.1117/1.OE.60.2.025102

Database:Compendex

Accession number:20210402357

Title:Scattered Image Reconstruction at Near-infrared Based on Spatial Modulation Instability

Authors:Liao, Yuan (1, 2); Li, Lin (1, 2); Wang, Zhaolu (1); Huang, Nan (1); Liu, Hongjun (1, 3)

Corresponding author:Liu, Hongjun(liuhongjun@opt.ac.cn)

Source title:arXiv

Abbreviated source title:arXiv

Issue date:November 28, 2021

Publication year:2021

Language:English

E-ISSN:23318422

Document type:Preprint (PP)

Publisher:arXiv

Abstract:<div data-language="eng" data-ev-field="abstract">We present a method of near-infrared image reconstruction based on spatial modulation instability in a photorefractive strontium barium niobate crystal. The conditions that lead to the formation of modulation instability at near-infrared are discussed depending on the theory of modulation instability gain. Experimental results of scattered image reconstruction at the 1064 nm wavelength show the maximum cross-correlation coefficient and cross-correlation gain are 0.57 and 2.09 respectively. This method is expected to be an aid for near-infrared imaging technologies.<br/></div> Copyright © 2021, The Authors. All rights reserved.

Number of references:33

Main heading:Image reconstruction

Controlled terms:Infrared devices - Modulation - Niobium compounds - Photoreactivity - Stability - Thermography (imaging)

Uncontrolled terms:Images reconstruction - Modulation instabilities - Near Infrared - Near- infrared images - Near-infrared - Near-infrared imaging - Photorefractive effects - Photorefractives - Spatial modulations - Strontium barium niobate crystals

Classification code:741.1 Light/Optics - 742.1 Photography

Numerical data indexing:Size 1.064E-06m

Database:Compendex

Preprint source website:https://arxiv.org

Preprint ID type:ARXIV

Accession number:20210409831033

Title:Vision-to-Language Tasks Based on Attributes and Attention Mechanism (Open Access)

Authors:Li, Xuelong (1); Yuan, Aihong (2, 3); Lu, Xiaoqiang (3)

Author affiliation:(1) School of Computer Science and Center for Optical Imagery Analysis and Learning, Northwestern Polytechnical University, Xi'an; 710072, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Key Laboratory of Spectral Imaging Technology CAS, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China

Corresponding author:Lu, Xiaoqiang(luxq666666@gmail.com)

Source title:IEEE Transactions on Cybernetics

Abbreviated source title:IEEE Trans. Cybern.

Volume:51

Issue:2

Issue date:February 2021

Publication year:2021

Pages:913-926

Article number:8718014

Language:English

ISSN:21682267

E-ISSN:21682275

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:Vision-to-language tasks aim to integrate computer vision and natural language processing together, which has attracted the attention of many researchers. For typical approaches, they encode image into feature representations and decode it into natural language sentences. While they neglect high-level semantic concepts and subtle relationships between image regions and natural language elements. To make full use of these information, this paper attempt to exploit the text-guided attention and semantic-guided attention (SA) to find the more correlated spatial information and reduce the semantic gap between vision and language. Our method includes two-level attention networks. One is the text-guided attention network which is used to select the text-related regions. The other is SA network which is used to highlight the concept-related regions and the region-related concepts. At last, all these information are incorporated to generate captions or answers. Practically, image captioning and visual question answering experiments have been carried out, and the experimental results have shown the excellent performance of the proposed approach.<br/> © 2013 IEEE.

Number of references:50

Main heading:Semantics

Controlled terms:Deep learning - Visual languages - Natural language processing systems

Uncontrolled terms:Attention mechanisms - Feature representation - High level semantics - Image captioning - NAtural language processing - Natural languages - Question Answering - Spatial informations

Classification code:461.4 Ergonomics and Human Factors Engineering - 723.1.1 Computer Programming Languages - 723.2 Data Processing and Image Processing

DOI:10.1109/TCYB.2019.2914351

Funding details: Number: 61772510, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: QYZDB-SSWJSC015, Acronym: CAS, Sponsor: Chinese Academy of Sciences;

Funding text:Manuscript received May 21, 2018; revised January 27, 2019 and April 20, 2019; accepted April 26, 2019. Date of publication May 17, 2019; date of current version January 15, 2021. This work was supported in part by the National Natural Science Foundation of China under Grant 61772510, and in part by the Young Top-Notch Talent Program of Chinese Academy of Sciences under Grant QYZDB-SSWJSC015. This paper was recommended by Associate Editor H. Lu. (Corresponding author: Xiaoqiang Lu.) X. Li is with the School of Computer Science and Center for Optical Imagery Analysis and Learning, Northwestern Polytechnical University, Xi’an 710072, China.

Database:Compendex

Open Access type(s): All Open Access, Green

Accession number:20214010984750

Title:Biomimetic multispectral curved compound eye camera for real-time multispectral imaging in an ultra-large field of view (Open Access)

Authors:Zhang, Yuanjie (1, 2); Xu, Huangrong (1, 2); Guo, Quan (1, 2); Wu, Dengshan (1, 2); Yu, Weixing (1, 2)

Author affiliation:(1) Key Laboratory of Spectral Imaging Technology, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, No. 17, Xinxi Road, Xian; 710119, China; (2) Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Yu, Weixing(yuwx@opt.ac.cn)

Source title:Optics Express

Abbreviated source title:Opt. Express

Volume:29

Issue:21

Issue date:October 11, 2021

Publication year:2021

Pages:33346-33356

Language:English

E-ISSN:10944087

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">In this work, we demonstrate a prototype of a biomimetic multispectral curved compound eye camera (BMCCEC). In comparison with traditional multispectral imaging systems, the BMCCEC developed in this work has the distinct features of multi-spectral imaging on multiple targets in real time in an ultra-large field of view (FOV), which can be attributed to its biomimetic curved compound eye structure as well as the multispectral cluster network. Specifically, the BMCCEC has a total of 104 multispectral ommatidia and a FOV of 98°×98°, which is able to realize 7-band multispectral imaging with center wavelengths of 500 nm, 560 nm, 600 nm, 650 nm, 700 nm, 750 nm and 800 nm and a spectral resolution of 10 nm. A prototype of BMCCEC was then manufactured and multispectral imaging experiments were performed based on it. As a result, the red edge feature of the spectrum of green plants has been successfully obtained and retrieved with a good accuracy.<br/></div> © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.

Number of references:22

Main heading:Biomimetics

Controlled terms:Real time systems - Cameras - Spectroscopy

Uncontrolled terms:Cluster networks - Compound eye - Compound-eye camera - Field of views - Large field of views - Multi-spectral - Multi-spectral imaging systems - Multiple targets - Multispectral imaging - Real- time

Classification code:461.8 Biotechnology - 461.9 Biology - 722.4 Digital Computers and Systems - 742.2 Photographic Equipment

Numerical data indexing:Size 1.00E-08m, Size 5.00E-07m, Size 5.60E-07m, Size 6.00E-07m, Size 6.50E-07m, Size 7.00E-07m, Size 7.50E-07m, Size 8.00E-07m

DOI:10.1364/OE.438710

Funding details: Number: 61975231, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:National Natural Science Foundation of China (61975231).

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20211610229638

Title:Modified scaling angular spectrum method for numerical simulation in long-distance propagation

Authors:Chen, Xiao-Yi (1, 2); Duan, Ya-Xuan (1); Xiang, Bin-Bin (3); Li, Ming (1); Da, Zheng-Shang (1)

Corresponding author:Duan, Ya-Xuan(duanyaxuan@opt.ac.cn)

Source title:Chinese Physics B

Abbreviated source title:Chin. Phys.

Volume:30

Issue:3

Issue date:March 2021

Publication year:2021

Article number:034203

Language:English

ISSN:16741056

E-ISSN:20583834

Document type:Journal article (JA)

Publisher:IOP Publishing Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">The angular method (AS) cannot be used in long-distance propagation because it produces severe numerical errors due to the sampling problem in the transfer function. Two ways can solve this problem in AS for long-distance propagation. One is zero-padding to make sure that the calculation window is wide enough, but it leads to a huge calculation burden. The other is a method called band-limited angular spectrum (BLAS), in which the transfer function is truncated and results in that the calculation accuracy decreases as the propagation distance increases. In this paper, a new method called modified scaling angular spectrum (MSAS) to solve the problem for long-distance propagation is proposed. A scaling factor is introduced in MSAS so that the sampling interval of the input plane can be adjusted arbitrarily unlike AS whose sampling interval is restricted by the detector's pixel size. The sampling interval of the input plane is larger than the detector's pixel size so the size of calculation window suitable for long-distance field propagation in the input plane is smaller than the size of the calculation window required by the zero-padding. Therefore, the method reduces the calculation redundancy and improves the calculation speed. The results from simulations and experiments show that MSAS has a good signal-to-noise ratio (SNR), and the calculation accuracy of MSAS is better than BLAS.<br/></div> © 2021 Chinese Physical Society and IOP Publishing Ltd

Number of references:30

Main heading:Signal to noise ratio

Controlled terms:Numerical methods - Pixels - Spectrum analysis - Transfer functions

Uncontrolled terms:Angular spectrum method - Calculation accuracy - Calculation speed - Long-distance propagation - Numerical errors - Propagation distances - Sampling interval - Sampling problems

Classification code:716.1 Information Theory and Signal Processing - 921 Mathematics - 921.6 Numerical Methods

DOI:10.1088/1674-1056/abd38d

Funding details: Number: 2020GY-114, Acronym: -, Sponsor: Key Technology Research and Development Program of Shandong;Number: 61705254, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:Project supported by the National Natural Science Foundation of China (Grant No. 61705254) and the Key Research and Development Program of Shaanxi Province of China (Grant No. 2020GY-114).

Database:Compendex

Accession number:20211510186719

Title:Offline Signature Authentication Algorithm Based on the Fuzzy Set (Open Access)

Authors:Qiu, Shi (1); Fei, Fengchang (2); Cui, Ying (3)

Author affiliation:(1) Key Laboratory of Spectral Imaging Technology CAS, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) College of Modern Economics and Management, Jiangxi University of Finance and Economic, Nanchang; 330077, China; (3) College of Equipment Management and Support, Engineering University of PAP, Xi'an; 710086, China

Corresponding author:Fei, Fengchang(ffcbox@163.com)

Source title:Mathematical Problems in Engineering

Abbreviated source title:Math. Probl. Eng.

Volume:2021

Issue date:2021

Publication year:2021

Article number:5554341

Language:English

ISSN:1024123X

E-ISSN:15635147

Document type:Journal article (JA)

Publisher:Hindawi Limited

Abstract:<div data-language="eng" data-ev-field="abstract">There exists a problem that it is difficult to identify the authenticity of offline signatures. Firstly, a segmentation model is established based on the theory of fuzzy sets to extract signatures completely. Secondly, statistical shape model (SSM) and variance distance discretization of intraclass signatures are introduced for stability analysis and quantification. Finally, multilayer classifiers are constructed to realize signature authentication. The algorithm has low false detection rate and short authentication time.<br/></div> © 2021 Shi Qiu et al.

Number of references:34

Main heading:Fuzzy sets

Controlled terms:Authentication

Uncontrolled terms:Authentication time - Offline signatures - Segmentation models - Signature authentication - Stability analysis - Statistical shape model - Theory of fuzzy sets - Variance distances

Classification code:723 Computer Software, Data Handling and Applications

DOI:10.1155/2021/5554341

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20210409830330

Title:Multisource Remote Sensing Data Classification with Graph Fusion Network

Authors:Du, Xingqian (1); Zheng, Xiangtao (1); Lu, Xiaoqiang (1); Doudkin, Alexander A. (2)

Author affiliation:(1) Key Laboratory of Spectral Imaging Technology Cas, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) Laboratory of System Identification, United Institute of Informatics Problems of the National Academy of Sciences of Belarus, Minsk; 220012, Belarus

Corresponding author:Zheng, Xiangtao(xiangtaoz@gmail.com)

Source title:IEEE Transactions on Geoscience and Remote Sensing

Abbreviated source title:IEEE Trans Geosci Remote Sens

Volume:59

Issue:12

Issue date:December 1, 2021

Publication year:2021

Pages:10062-10072

Language:English

ISSN:01962892

E-ISSN:15580644

CODEN:IGRSD2

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">The land cover classification has been an important task in remote sensing. With the development of various sensors technologies, carrying out classification work with multisource remote sensing (MSRS) data has shown an advantage over using a single type of data. Hyperspectral images (HSIs) are able to represent the spectral properties of land cover, which is quite common for land cover understanding. Light detection and ranging (LiDAR) images contain altitude information of the ground, which is greatly helpful with urban scene analysis. Current HSI and LiDAR fusion methods perform feature extraction and feature fusion separately, which cannot well exploit the correlation of data sources. In order to make full use of the correlation of multisource data, an unsupervised feature extraction-fusion network for HSI and LiDAR, which utilizes feature fusion to guide the feature extraction procedure, is proposed in this article. More specifically, the network takes multisource data as input and directly output the unified fused feature. A multimodal graph is constructed for feature fusion, and graph-based loss functions including Laplacian loss and t-distributed stochastic neighbor embedding (t-SNE) loss are utilized to constrain the feature extraction network. Experimental results on several data sets demonstrate the proposed network can achieve more excellent classification performance than some state-of-the-art methods.<br/></div> © 1980-2012 IEEE.

Number of references:52

Main heading:Feature extraction

Controlled terms:Graphic methods - Image classification - Extraction - Optical radar - Classification (of information) - Deep learning - Stochastic systems - Remote sensing - Spectroscopy

Uncontrolled terms:Classification performance - Extraction procedure - Land cover classification - Light detection and ranging - Multisource remote sensing data - Spectral properties - State-of-the-art methods - Stochastic neighbor embedding

Classification code:461.4 Ergonomics and Human Factors Engineering - 716.1 Information Theory and Signal Processing - 716.2 Radar Systems and Equipment - 723.2 Data Processing and Image Processing - 731.1 Control Systems - 741.3 Optical Devices and Systems - 802.3 Chemical Operations - 903.1 Information Sources and Analysis - 961 Systems Science

DOI:10.1109/TGRS.2020.3047130

Funding details: Number: F20-017, Acronym: -, Sponsor: -;Number: 2020KJXX-091,2020TD-015, Acronym: -, Sponsor: -;Number: -, Acronym: BRFFR, Sponsor: Belarusian Republican Foundation for Fundamental Research;Number: 62011530021, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 61772510,61806193,61925112, Acronym: -, Sponsor: National Science Fund for Distinguished Young Scholars;Number: 2019JC-23,2019JQ-340, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;

Funding text:This work was supported in part by the Funds for International Cooperation and Exchange of the National Natural Science Foundation of China Grant 62011530021, in part by the Belarusian Republican Foundation for Fundamental Research and National Natural Science Foundation of China (joint project BRFFR-NNSF) under Grant F20-017, in part by the National Science Found for Distinguished Young Scholars under Grant 61925112, in part by the National Natural Science Foundation of China under Grant 61806193 and Grant 61772510, in part by the Innovation Capability Support Program of Shaanxi under Grant 2020KJXX-091 and Grant 2020TD-015, and in part by the Natural Science Basic Research Program of Shaanxi under Grant 2019JQ-340 and Grant 2019JC-23.

Database:Compendex

Accession number:20214911288628

Title:Decoupling control of fast steering mirror based on dual feedforward + dual neural network adaptive

Title of translation:基于双前馈+双神经网络自适应快速反射镜的解耦控制

Authors:Wang, Rui (1, 2); Su, Xiuqin (1, 3); Qiao, Yongming (1); Lv, Tao (1); Wang, Xuan (1, 2); Wang, Kaidi (1, 2)

Author affiliation:(1) Key Laboratory of Space Precision Measurement Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Pilot National Laboratory for Marine Science and Technology, Qingdao; 266237, China

Source title:Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering

Abbreviated source title:Hongwai yu Jiguang Gongcheng Infrared Laser Eng.

Volume:50

Issue:11

Issue date:November 25, 2021

Publication year:2021

Article number:20210194

Language:Chinese

ISSN:10072276

Document type:Journal article (JA)

Publisher:Chinese Society of Astronautics

Abstract:<div data-language="eng" data-ev-field="abstract">Two-axis fast steering mirror based on flexure hinge support and voice coil motor drive is a strong coupling system with two inputs and two outputs. The coupling between X-axis and Y-axis greatly reduces the positioning accuracy of the fast steering mirror. It is difficult to achieve high precision decoupling control by using traditional PID control algorithm. Based on the centrosymmetric and axisymmetric two-axis fast steering mirror, the coupling sources of the two-axis fast steering mirror-DC coupling component and non-DC coupling component were analyzed theoretically, and the coupling physical model of between X-axis and Y-axis was established. A dual feedforward + dual neural network adaptive decoupling control algorithm was proposed to respectively compensate DC coupling components and non-DC coupling components. Experimental results show that, compared with the traditional PID control algorithm, the coupling degree of the proposed algorithm is reduced from about 5% to less than 1.0&permil;, which significantly improves the positioning accuracy from about 2.5% to less than 0.5&permil;.<br/></div> © 2021, Editorial Board of Journal of Infrared and Laser Engineering. All right reserved.

Number of references:12

Main heading:Three term control systems

Controlled terms:Position control - Adaptive control systems - Feedforward neural networks - Hinges - Mirrors

Uncontrolled terms:Decouplings - Dual feedforward - Dual neural network adaptive - Dual neural networks - Fast-steering mirrors - Feed forward - Network adaptive - Positioning accuracy - Two-axis - Two-axis fast steering mirror

Classification code:731.1 Control Systems - 731.3 Specific Variables Control - 741.3 Optical Devices and Systems

Numerical data indexing:Percentage 2.50E+00%, Percentage 5.00E+00%

DOI:10.3788/IRLA20210194

Database:Compendex

Accession number:20220611611444

Title:Development of Underwater Hyperspectral Imaging Detecting Technology (Invited)

Title of translation:水下高光谱成像探测技术研究进展(特邀)

Authors:Xue, Qingsheng (1); Bai, Haoxuan (1); Li, Hui (1); Wang, Yajun (2); Zhang, Dongxue (3)

Author affiliation:(1) School of Physics and Optoelectronic Engineering, Department of Information Science and Engineering, Ocean University of China, Qingdao; 266100, China; (2) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) Chongqing Institute of Engineering, Chongqing; 400056, China

Source title:Guangzi Xuebao/Acta Photonica Sinica

Abbreviated source title:Guangzi Xuebao

Volume:50

Issue:12

Issue date:December 25, 2021

Publication year:2021

Pages:1-26

Language:Chinese

ISSN:10044213

CODEN:GUXUED

Document type:Journal article (JA)

Publisher:Chinese Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">With the development of marine economy and ocean exploration, the demand about the detection methods with high accuracy and efficiency becomes urgent. As a technology which combined the spectral technology and imaging technology, the hyperspectral imaging technology can bridge the gap of underwater high-precision detection demand to some degree, so the researchers begin to develop it and use it in the underwater detection. The background of the development of underwater hyperspectral imaging technology is first introduced, then the different methods of hyperspectral imaging technology and the components of underwater hyperspectral detection system are summarized. The research progress of underwater hyperspectral imaging detecting technology is summarized after that. The challenges which underwater hyperspectral imaging technology faces are pointed out, and the expectation of the underwater hyperspectral imaging technology is given.<br/></div> © 2021, Science Press. All right reserved.

Number of references:58

Main heading:Hyperspectral imaging

Controlled terms:Spectroscopy - Underwater imaging

Uncontrolled terms:Classification of spectrum data - Detecting technology - Detection methods - HyperSpectral - Hyperspectral imaging technologies - Imaging detecting - Imaging spectrometers - Ocean exploration - Spectra datum - Underwater detecting

Classification code:746 Imaging Techniques

DOI:10.3788/gzxb20215012.1201001

Funding details: Number: 20190302083GX, Acronym: -, Sponsor: -;Number: 2020XJDN010039, Acronym: -, Sponsor: -;Number: 202065004, Acronym: -, Sponsor: -;Number: 2020CXGC010706, Acronym: -, Sponsor: Key Technology Research and Development Program of Shandong;Number: 41575023,U2006209, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: COMS2019J04, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2020-XZ-5, Acronym: -, Sponsor: Key Laboratory of Engineering Plastics, Chinese Academy of Sciences;Number: 2018YFF01011003,2019YFC1408300,2019YFC1408301, Acronym: -, Sponsor: National Basic Research Program of China (973 Program);

Funding text:Key Research and Development Program of Shandong Province (No. 2020CXGC010706), National Natural Science Foundation of China (Nos. U2006209, 41575023), Key Project of Major Subject of New and Old Kinetic Energy Conversion in Shandong Province (No. 2020XJDN010039), Special Fund for Basic Scientific Research Business of Central Universities (No. 202065004), Jilin Province Science and Technology Development Plan Project (No. 20190302083GX), National Key Research and Development Program of China (Nos. 2019YFC1408300, 2019YFC1408301, 2018YFF01011003), Key Deployment Project of the Marine Science Research Center of the Chinese Academy of Sciences (No. COMS2019J04), Consulting Research Project of Chinese Academy of Engineering (No. 2020-XZ-5)Foundation item：Key Research and Development Program of Shandong Province（No. 2020CXGC010706），National Natural Science Foundation of China（Nos. U2006209，41575023），Key Project of Major Subject of New and Old Kinetic Energy Conversion in Shandong Province（No. 2020XJDN010039），Special Fund for Basic Scientific Research Business of Central Universities（No. 202065004），Jilin Province Science and Technology Development Plan Project（No. 20190302083GX），National Key Research and Development Program of China（Nos. 2019YFC1408300，2019YFC1408301，2018YFF01011003），Key Deployment Project of the Marine Science Research Center of the Chinese Academy of Sciences（No. COMS2019J04），Consulting Research Project of Chinese Academy of Engineering（No. 2020-XZ-5）

Database:Compendex

Accession number:20213710891807

Title:A time-correlated single photon counting signal denoising method based on elastic variational mode extraction (Open Access)

Title of translation:基于弹性变分模态提取的时间相关单光子计数信号去噪 (Open Access)

Authors:Wang, Shu-Chao (1, 2, 3); Su, Xiu-Qin (1, 3); Zhu, Wen-Hua (1, 2, 3); Chen, Song-Mao (1, 3); Zhang, Zhen-Yang (1, 2, 3); Xu, Wei-Hao (1, 2); Wang, Ding-Jie (1, 2)

Corresponding author:Su, Xiu-Qin(suxiuqin@opt.ac.cn)

Source title:Wuli Xuebao/Acta Physica Sinica

Abbreviated source title:Wuli Xuebao

Volume:70

Issue:17

Issue date:September 5, 2021

Publication year:2021

Article number:174304

Language:Chinese

ISSN:10003290

CODEN:WLHPAR

Document type:Journal article (JA)

Publisher:Institute of Physics, Chinese Academy of Sciences

Abstract:<div data-language="eng" data-ev-field="abstract">The performance of the method of measuring the time-correlated single photon counting signal is the key to improving the ranging accuracy of single photon light detection and ranging (LiDAR) technique, where noise elimination is a critically essential step to obtain the characteristics of signal. In this paper, a new method called elastic variational mode extraction (EVME) is proposed to extract the feature of the reflected photons from noisy environment. The method takes into account the characteristic of photon counting signal, and improves variational mode decomposition (VMD) method by adopting a new assumption that the extractive mode signal should be compact around desired center frequency. The proposed method also uses the elastic net regularization to solve ill-posed problem instead of Tikhonov regularization mentioned in VMD. Elastic net regularization takes into account both L2-norm regularization and L1-norm regularization, which can add an extra analysis dimension compared with the Tikhonov regularization. The method is validated with real data which are acquired on condition that average transmitting power is 25 nW while the average background noise power is 19.51 μW. The root mean square error of the reconstruction accuracy reaches 1.414 ns. Furthermore, compared with VMD, Haar wavelet, Hibert envelope, empirical mode decomposition (EMD) and complete ensemble empirical mode decomposition method based on adaptive noise (CEEMDAN) under different conditions, the proposed method show fast and stable performance under an extreme case.<br/></div> © 2021 Chinese Physical Society.

Number of references:25

Main heading:Variational mode decomposition

Controlled terms:Mean square error - Photons - Extraction - Optical radar - Wavelet decomposition - Particle beams

Uncontrolled terms:Empirical Mode Decomposition - Ensemble empirical mode decomposition - Light detection and ranging techniques - Mode decomposition - Reconstruction accuracy - Root mean square errors - Tikhonov regularization - Time-correlated single photon counting

Classification code:716.1 Information Theory and Signal Processing - 716.2 Radar Systems and Equipment - 741.3 Optical Devices and Systems - 802.3 Chemical Operations - 921.3 Mathematical Transformations - 922.2 Mathematical Statistics - 931.3 Atomic and Molecular Physics - 932.1 High Energy Physics

Numerical data indexing:Power 1.95e-05W, Power 2.50e-08W, Time 1.41e-09s

DOI:10.7498/aps.70.20210149

Funding details: Number: GQRC-19-19, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2020M683600, Acronym: -, Sponsor: China Postdoctoral Science Foundation;

Funding text:* Project supported by the China Postdoctoral Science Foundation (Grant No. 2020M683600) and the Strategic High Technology Innovation Project of the Chinese Academy of Sciences (Grant No. GQRC-19-19). &dagger; Corresponding author. E-mail: suxiuqin@opt.ac.cn

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20204209343663

Title:Development of low-loss lead-germanate glass for mid-infrared fiber optics: I. glass preparation optimization (Open Access)

Authors:Wang, Pengfei (1, 2, 3); Bei, Jiafang (1); Ahmed, Naveed (1); Ng, Alson Kwun Leung (1); Ebendorff-Heidepriem, Heike (1)

Author affiliation:(1) Institute of Photonics and Advanced Sensing, School of Physical Sciences, The University of Adelaide, Adelaide; SA, Australia; (2) Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, China; (3) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences (CAS), Xi'an Shaanxi, China

Corresponding authors:Wang, Pengfei(pfwang@opt.ac.cn); Ebendorff-Heidepriem, Heike(heike.ebendorff@adelaide.edu.au); Wang, Pengfei(pfwang@opt.ac.cn); Wang, Pengfei(pfwang@opt.ac.cn)

Source title:Journal of the American Ceramic Society

Abbreviated source title:J Am Ceram Soc

Volume:104

Issue:2

Issue date:February 2021

Publication year:2021

Pages:860-876

Language:English

ISSN:00027820

E-ISSN:15512916

CODEN:JACTAW

Document type:Journal article (JA)

Publisher:Blackwell Publishing Inc.

Abstract:Reducing the mid-infrared attenuation loss due to absorption of hydroxyl (OH) groups and scattering of metallic Pb species for lead-germanate glass is essential to pave the way for their applications as low-loss mid-infrared fiber optics. In the first part of this study, we report the understanding of the factors that determine dehydration efficiency and metallic Pb formation during the lead-germanate glassmelting process. Combining a dry O<inf>2</inf>-rich atmosphere containing ultra-dry N<inf>2</inf> together with the use of chloride dehydration agent and nitrate oxidation agent compound was found to enable efficient dehydration effect and absence of metallic Pb scattering sources in the dehydrated glasses. This glassmelting procedure overcomes previous limitations on the preparation of similar kinds of heavy-metal oxide glasses, where only pure O<inf>2</inf> atmosphere was used and/or use of fluoride dehydration agent deteriorated the glass thermal stability. This work provides guidance for developing other low-loss mid-infrared glasses/fibers containing multivalent heavy-metal ions such as Pb, Bi, Te, Sb, etc.<br/> © 2020 American Ceramic Society (ACERS)

Number of references:38

Main heading:Dehydration

Controlled terms:Fiber optics - Chlorine compounds - Infrared devices - Fluorine compounds - Metal ions - Glass - Heavy metals

Uncontrolled terms:Attenuation loss - Dehydration efficiency - Glass melting - Glass melting process - Glass preparation - Heavy metal oxide glass - Lead germanate - Scattering source

Classification code:531 Metallurgy and Metallography - 531.1 Metallurgy - 741.1.2 Fiber Optics - 802.2 Chemical Reactions - 812.3 Glass

DOI:10.1111/jace.17503

Funding details: Number: 144033, Acronym: AFOSR, Sponsor: Air Force Office of Scientific Research;Number: -, Acronym: -, Sponsor: University of Adelaide;Number: 201704910379, Acronym: CSC, Sponsor: China Scholarship Council;

Funding text:We acknowledge the Asian Office of Aerospace Research and Development project (Air Force Office of Scientific Research Grant #144033) for funding this work. This work was performed in part at the OptoFab node of the Australian National Fabrication Facility (ANFF) utilizing Commonwealth and South Australian State Government Funding. We acknowledge Ben Wade in Adelaide Microscopy for electron microprobe measurement and Rui Wan for help with DSC measurement. Pengfei Wang gives his special thanks to China Scholarship Council (CSC No. 201704910379) for supporting his visiting research at the University of Adelaide.

Database:Compendex

Open Access type(s): All Open Access, Bronze

Accession number:20212810622274

Title:Flexible dynamic structural color based on an ultrathin asymmetric Fabry-Perot cavity with phase-change material for temperature perception (Open Access)

Authors:ZHAO, JIANCUN (1, 2, 3); ZHOU, YI (4); HUO, YIHUI (5); GAO, BO (6); MA, YUNGUI (7); YU, YITING (8)

Author affiliation:(1) Research and Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen; 518057, China; (2) College of Mechanical Engineering, Northwestern Polytechnical University, Xi'an; 710072, China; (3) Institute of Northwestern Polytechnical University, Ningbo; 315103, China; (4) Key Laboratory of Micro/Nano Systems for Aerospace (Ministry of Education), Northwestern Polytechnical University, Xi'an; 710072, China; (5) Shaanxi Province Key Laboratory of Micro and Nano Electro-Mechanical Systems, Northwestern Polytechnical University, Xi'an; 710072, China; (6) State Key Lab of Modern Optical Instrumentation, Centre for Optical and Electromagnetic Research, College of Optical Science and Engineering; International Research Center for Advanced Photonics, Zhejiang University, Hangzhou; 310058, China; (7) Key Laboratory of Spectral Imaging Technology of Chinese Academy of Sciences, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xian; 710119, China; (8) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:YU, YITING(yyt@nwpu.edu.cn)

Source title:Optics Express

Abbreviated source title:Opt. Express

Volume:29

Issue:15

Issue date:July 19, 2021

Publication year:2021

Pages:23273-23281

Language:English

E-ISSN:10944087

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">Dynamic structural color has attracted considerable attentions due to its good tunable characteristics. Here, an ultrathin asymmetric Fabry-Perot (FP)-type structural color with phase-change material VO2 cavity is proposed. The color-switching performance can be realized by temperature regulation due to the reversible monoclinic-rutile phase transition of VO2. The various, vivid structural color can be generated by simply changing the thickness of VO2 and Ag layers. Moreover, the simple structural configuration enables a large-scale, low-cost preparation on both rigid and flexible substrates. Accordingly, a flexible dynamic structural color membrane is adhered on a cup with a curved surface to be used for temperature perception. The proposed dynamic structural color has potential applications in anti-counterfeiting, temperature perception, camouflage coatings among other flexible optoelectronic devices.<br/></div> © 2021 Optical Society of America.

Number of references:30

Main heading:Vanadium dioxide

Controlled terms:Optoelectronic devices - Oxide minerals - Fabry-Perot interferometers - Color - Phase change materials - Titanium dioxide

Uncontrolled terms:Anti-counterfeiting - Asymmetric Fabry Perot - Asymmetric Fabry-Perot cavities - Camouflage coatings - Flexible dynamics - Rigid and flexible substrates - Structural configurations - Temperature regulations

Classification code:482.2 Minerals - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 804.2 Inorganic Compounds - 941.3 Optical Instruments

DOI:10.1364/OE.431906

Funding details: Number: 20JY031, Acronym: -, Sponsor: -;Number: 202003N4033, Acronym: -, Sponsor: Natural Science Foundation of Ningbo;Number: 51975483,61775195,62075196, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: JCYJ20180508151936092, Acronym: -, Sponsor: Science, Technology and Innovation Commission of Shenzhen Municipality;Number: 2020ZDLGY01-03, Acronym: -, Sponsor: Key Research and Development Projects of Shaanxi Province;

Funding text:Funding. Science, Technology and Innovation Commission of Shenzhen Municipality (JCYJ20180508151936092); National Natural Science Foundation of China (51975483, 61775195, 62075196); Natural Science Foundation of Ningbo (202003N4033); Key Research and Development Projects of Shaanxi Province (2020ZDLGY01-03); Collaborative Innovation Center Project of Shaanxi Provincial Department of Education (20JY031).

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20204409443313

Title:Development of low-loss lead-germanate glass for mid-infrared fiber optics: II. preform extrusion and fiber fabrication

Authors:Wang, Pengfei (1, 2, 3); Ng, Alson Kwun Leung (1); Dowler, Alastair (1); Ebendorff-Heidepriem, Heike (1)

Corresponding authors:Wang, Pengfei(pfwang@opt.ac.cn); Ng, Alson Kwun Leung(heike.ebendorff@adelaide.edu.au); Dowler, Alastair(pfwang@opt.ac.cn); Ebendorff-Heidepriem, Heike(pfwang@opt.ac.cn); Wang, Pengfei(pfwang@opt.ac.cn); Wang, Pengfei(pfwang@opt.ac.cn)

Source title:Journal of the American Ceramic Society

Abbreviated source title:J Am Ceram Soc

Volume:104

Issue:2

Issue date:February 2021

Publication year:2021

Pages:833-850

Language:English

ISSN:00027820

E-ISSN:15512916

CODEN:JACTAW

Document type:Journal article (JA)

Publisher:Blackwell Publishing Inc.

Abstract:For lead-germanate glass fibers, reducing the content of hydroxyl (OH) groups and the formation of metallic Pb species is essential to pave the way for their applications as low-loss mid-IR fiber optics since OH and metallic Pb species cause intense absorption and scattering loss, respectively, in the mid-IR spectral range. The first part of this study reported the optimization of the glass melting procedure to obtain low amount of OH while preventing formation of metallic Pb species in lead-germanate glass. Here, the second part of this study reports the investigation of the process conditions to fabricate low-loss lead-germanate glass fiber through further understanding of the co-effects of glass melting and heat treatment atmospheres on the formation of nano- and micron-scale metallic Pb species in both the as-produced and heat treated lead-germanate glasses. Finally, using this advance in knowledge, we successfully fabricated low-loss lead-germanate glass fibers with no presence of reduced metallic Pb particles by optimizing dehydration agent, glass melting, preform extrusion and fiber drawing conditions. The optimized fabrication conditions reduced the unstructured fiber loss by almost one order to <0.3 dB/m at 1.55 μm.<br/> © 2020 American Ceramic Society (ACERS)

Number of references:58

Main heading:Glass fibers

Controlled terms:Extrusion - Preforming - Fiber optics - Metals - Dehydration - Heat treatment - Infrared devices - Melting

Uncontrolled terms:Absorption and scatterings - Fiber drawing - Glass melting - IR spectral range - Lead germanate - Micron scale - Midinfrared - Process condition

Classification code:537.1 Heat Treatment Processes - 741.1.2 Fiber Optics - 802.2 Chemical Reactions - 802.3 Chemical Operations - 812.3 Glass

DOI:10.1111/jace.17518

Funding text:We acknowledge the Asian Office of Aerospace Research and Development project (Air Force Office of Scientific Research Grant #144033) for funding this work. This work was performed in part at the OptoFab node of the Australian National Fabrication Facility (ANFF) utilizing Commonwealth and South Australian State Government Funding. Pengfei Wang gives his special thanks to China Scholarship Council (CSC No. 201704910379) for supporting his visiting research in the University of Adelaide.

Database:Compendex

Accession number:20210709904693

Title:Thermal Analysis of Visible Emission from Micro-Ring Resonators by Third-Harmonic Generation

Authors:Wang, Shao Hao (1); Li, Yuhua (2); Wang, Leiran (3); Little, Brent E. (3); Chu, Sai Tak (4)

Author affiliation:(1) FZU-Jinjiang Joint Institute of Microelectronics, Jinjiang Science and Education Park, Fuzhou University, Jinjiang, China; (2) Department of Physics, Zhejiang Sci-Tech University, Hangzhou, Zhejiang, China; (3) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China; (4) Department of Physics, City University of Hong Kong, Hong Kong, Hong Kong

Corresponding author:Wang, Shao Hao(shwang@fzu.edu.cn)

Source title:IEEE Photonics Technology Letters

Abbreviated source title:IEEE Photonics Technol Lett

Volume:33

Issue:5

Issue date:March 1, 2021

Publication year:2021

Pages:235-238

Article number:9335593

Language:English

ISSN:10411135

E-ISSN:19410174

CODEN:IPTLEL

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">We present a thermal model to describe the interaction between the visible modes in micro-ring resonators from the third harmonic generation (THG) nonlinear process. We demonstrate that the model can predict the thermal characteristics of the orthogonal THG modes from the interaction and of the resonance coupling between them in micro-ring resonators having a strong nonlinear thermo-optic coefficient. Furthermore, the model can be used to extract the THG efficiency, the linear and nonlinear thermo-optic coefficients and the polarization dependency of the THG modes from the measurement data.<br/></div> © 1989-2012 IEEE.

Number of references:13

Main heading:Optical resonators

Controlled terms:Harmonic generation - Thermoanalysis - Integrated optics - Harmonic analysis

Uncontrolled terms:Measurement data - Microring resonator - Nonlinear process - Polarization dependency - Resonance couplings - Thermal characteristics - Thermo-optic coefficients - Visible emissions

Classification code:741.3 Optical Devices and Systems - 801 Chemistry - 921.6 Numerical Methods

DOI:10.1109/LPT.2021.3054379

Database:Compendex

Accession number:20205009599322

Title:Peregrine combs and rogue waves on a bright soliton background

Authors:Guo, Lehui (1, 2, 3); Chen, Ping (1, 2); Tian, Jinshou (1, 3)

Author affiliation:(1) Key Laboratory of Ultra-Fast Photoelectric Diagnostics Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China

Corresponding author:Chen, Ping(chenping@opt.cn)

Source title:Optik

Abbreviated source title:Optik

Volume:227

Issue date:February 2021

Publication year:2021

Article number:165455

Language:English

ISSN:00304026

Document type:Journal article (JA)

Publisher:Elsevier GmbH

Abstract:The dynamics of the modulation rogue waves in an inhomogeneous nonlinear optical fiber with the periodic modulation are studied. We find that for different modulation amplitudes and modulation frequencies, the modulation rogue wave solution can be Peregrine comb, rogue wave, or the transition state in between, respectively. In particular, the phase diagram of the three kinds of nonlinear states is given at the modulation amplitude and modulation frequency plane. Moreover, the dynamics characteristics of the Peregrine comb and the rogue wave are discussed on the localized soliton background. It is interesting that the main excitation characteristics of the Peregrine combs and the rogue waves on an infinitely wide plane wave background are well maintained on the soliton background. These results pave the way for exciting and manipulating the rogue waves on a local background.<br/> © 2020 Elsevier GmbH

Number of references:43

Main heading:Solitons

Controlled terms:Optical fibers - Nonlinear optics - Frequency modulation

Uncontrolled terms:Bright solitons - Dynamics characteristic - Excitation characteristics - Modulation amplitudes - Modulation frequencies - Non-linear optical fibers - Periodic modulation - Transition state

Classification code:741.1.1 Nonlinear Optics - 741.1.2 Fiber Optics

DOI:10.1016/j.ijleo.2020.165455

Funding details: Number: GJJSTD20190004, Acronym: -, Sponsor: -;Number: 11805267, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:This work is supported by grants from N ational Natural Science Foundation of China (Grant No. 11805267) and C hinese Academy of Sciences (Grant No. GJJSTD20190004) .

Database:Compendex

Accession number:20213410804893

Title:Multi-brightness layers with a genetic optimization algorithm for stereo matching under dramatic illumination changes

Authors:Yang, Tao (1, 2); Yang, Rui (3); Qiu, Yuehong (1)

Author affiliation:(1) Chinese Academy of Sciences, Xi'an Institute of Optics and Precision Mechanics, No. 17 Xinxi Road, Shaanxi, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing; 100049, China; (3) Putian University, No. 1133 Xueyuan Road, Fujian, Putian; 351100, China

Corresponding author:Yang, Rui(781307404@qq.com)

Source title:Applied Optics

Abbreviated source title:Appl. Opt.

Volume:60

Issue:24

Issue date:August 20, 2021

Publication year:2021

Pages:7371-7380

Language:English

ISSN:1559128X

E-ISSN:21553165

CODEN:APOPAI

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">Stereo matching under dramatic illumination changes is a big challenge in imbalanced binocular vision, selfdriving cars, and the remote sensing image field. A novel, to the best of our knowledge, multi-brightness layer mechanism with a genetic optimization algorithm is proposed in this paper. The mechanism of multi-brightness layers transforms the two images with dramatic illumination changes into a series of matched pairs with similar brightness by the stretching function and histogram matching principle. Therefore, the large illumination variations are reduced greatly. Moreover, the initial disparities as first generation of genetic optimization approach are generated from matched pairs using fast segmentation local stereo matching to increase the efficiency and accuracy. For further improving the accuracy of disparity, an enhanced genetic optimization algorithm for stereo matching is designed to have more inliers and continuity. The experimental results comparing with state-of-theart stereo matching methods demonstrate that the proposed method has better performance in accuracy and stability.<br/></div> © 2021 Optical Society of America.

Number of references:44

Main heading:Luminance

Controlled terms:Optimization - Stereo image processing - Binocular vision - Stereo vision - Optical remote sensing

Uncontrolled terms:Genetic optimization - Genetic optimization algorithm - Histogram matching - Illumination changes - Illumination variation - Local stereo matching - Remote sensing images - Stereo matching method

Classification code:723.2 Data Processing and Image Processing - 723.5 Computer Applications - 741.2 Vision - 741.3 Optical Devices and Systems - 921.5 Optimization Techniques

DOI:10.1364/AO.432015

Funding details: Number: 61475190, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:National Natural Science Foundation of China (61475190).

Database:Compendex

Accession number:20211410174068

Title:A wide-band collimator with large field of view and low distortion

Authors:Zhang, Xuemin (1); Dai, Yidan (2); Song, Xing (1); Li, Hua (1)

Author affiliation:(1) Xi’an Institute of Optics and Precision Mechanics of CAS, New Industrial Park, Xi'an Hi-Tech Industrial Development Zone, NO.17 Xinxi Road, Xi'an,Shaanxi; 710119, China; (2) University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Shijingshan District, Beijing; 100049, China

Corresponding author:Zhang, Xuemin

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11780

Part number:1 of 1

Issue title:Global Intelligent Industry Conference 2020

Issue date:2021

Publication year:2021

Article number:1178008

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510643949

Document type:Conference article (CA)

Conference name:Global Intelligent Industry Conference 2020

Conference date:November 20, 2020 - November 21, 2020

Conference location:Guangzhou, China

Conference code:167976

Sponsor:Chinese Society for Optical Engineering

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">With the continuous development of aerospace and aviation, the field of view of the interferometric spectrometer is getting larger and larger, and the field of view of the interferometer also increases. In order to realize the precise adjustment of the interferometer, it is necessary to input the interferometer through a large field of view target to form a large array of interference fringes. In order to improve the measurement accuracy of interference fringes, the large field of view target with small distortion and small chromatic aberration is required to produce interference fringes with a large field of view, so it is necessary to design wide-band collimator with a large field of view to provide an object that meets the above characteristics. In this paper, we designed a collimator whose focal length of the system is 307mm, the field of view is ±12°, the working wavelength is 450nm~900nm,the effective aperture is F50mm. The diameter of the diffusion spot in each field of view is smaller than the diameter of the Ellie disk, reaching the diffraction limit, and the distortion correction is better than 2%. The transfer function is almost close to the diffraction limit, meeting the design requirements of the wide-band collimator with large field of view and low distortion.<br/></div> © 2021 SPIE.

Number of references:5

Main heading:Interferometers

Controlled terms:Diffraction - Aberrations

Uncontrolled terms:Chromatic aberration - Continuous development - Diffraction limits - Distortion correction - Effective aperture - Interference fringe - Large field of views - Measurement accuracy

Classification code:941.3 Optical Instruments

Numerical data indexing:Percentage 2.00e+00%, Size 3.07e-01m

DOI:10.1117/12.2588832

Database:Compendex

Accession number:20204509465321

Title:Audio description from image by modal translation network (Open Access)

Authors:Ning, Hailong (1, 2); Zheng, Xiangtao (1); Yuan, Yuan (3); Lu, Xiaoqiang (1)

Author affiliation:(1) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; Shaanxi; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) The Center for OPTical IMagery Analysis and Learning (OPTIMAL), School of the Computer Science, Northwestern Polytechnical University, Xi'an; Shaanxi; 710072, China

Corresponding author:Zheng, Xiangtao(xiangtaoz@gmail.com)

Source title:Neurocomputing

Abbreviated source title:Neurocomputing

Volume:423

Issue date:January 29, 2021

Publication year:2021

Pages:124-134

Language:English

ISSN:09252312

E-ISSN:18728286

CODEN:NRCGEO

Document type:Journal article (JA)

Publisher:Elsevier B.V., Netherlands

Abstract:Audio is the main form for the visually impaired to obtain information. In reality, all kinds of visual data always exist, but audio data does not exist in many cases. In order to help the visually impaired people to better perceive the information around them, an image-to-audio-description (I2AD) task is proposed to generate audio descriptions from images in this paper. To complete this totally new task, a modal translation network (MT-Net) from visual to auditory sense is proposed. The proposed MT-Net includes three progressive sub-networks: 1) feature learning, 2) cross-modal mapping, and 3) audio generation. First, the feature learning sub-network aims to learn semantic features from image and audio, including image feature learning and audio feature learning. Second, the cross-modal mapping sub-network transforms the image feature into a cross-modal representation with the same semantic concept as the audio feature. In this way, the correlation of inter-modal data is effectively mined for easing the heterogeneous gap between image and audio. Finally, the audio generation sub-network is designed to generate the audio waveform from the cross-modal representation. The generated audio waveform is interpolated to obtain the corresponding audio file according to the sample frequency. Being the first attempt to explore the I2AD task, three large-scale datasets with plenty of manual audio descriptions are built. Experiments on the datasets verify the feasibility of generating intelligible audio from an image directly and the effectiveness of proposed method.<br/> © 2020 Elsevier B.V.

Number of references:59

Main heading:Mapping

Controlled terms:Semantics - Large dataset - Modal analysis

Uncontrolled terms:Audio description - Cross-modal representations - Feature learning - Large-scale datasets - Sample frequency - Semantic features - Visually impaired - Visually impaired people

Classification code:405.3 Surveying - 723.2 Data Processing and Image Processing - 921 Mathematics

DOI:10.1016/j.neucom.2020.10.053

Funding details: Number: 2020KJXX-091,2020TD-015, Acronym: -, Sponsor: -;Number: 61825603,QYZDY-SSW-JSC044, Acronym: -, Sponsor: -;Number: 61632018,61702498,61772510,61806193, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: QYZDB-SSW-JSC015,XAB2017B15,XAB2017B26, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 61925112, Acronym: -, Sponsor: National Science Fund for Distinguished Young Scholars;Number: 2019JQ-340, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;

Funding text:This work was supported in part by the National Natural Science Found for Distinguished Young Scholars under Grant 61925112, in part by the National Natural Science Foundation of China under Grant 61806193, Grant 61702498, and Grant 61772510, in part by the Young Top-Notch Talent Program of Chinese Academy of Sciences under Grant QYZDB-SSW-JSC015, in part by the CAS "Light of West China" Program under Grant XAB2017B26, and Grant XAB2017B15, in part by the Innovation Capability Support Program of Shaanxi under Grant 2020KJXX-091 and Grant 2020TD-015, in part by the Natural Science Basic Research Program of Shaanxi under Grant 2019JQ-340, in part by the Key Research Program of Frontier Sciences, Chinese Academy of Sciences under Grant QYZDY-SSW-JSC044, in part by the National Natural Science Found for Distinguished Young Scholars under Grant 61825603, in part by the State Key Program of National Natural Science of China under Grant 61632018.

Database:Compendex

Open Access type(s): All Open Access, Green

Accession number:20214511125455

Title:Algorithm of Pulmonary Vascular Segment and Centerline Extraction (Open Access)

Authors:Qiu, Shi (1); Lian, Jie (2); Ding, Yan (3); Zhou, Tao (4); Liang, Ting (5, 6)

Author affiliation:(1) Key Laboratory of Spectral Imaging Technology CAS, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) Department of Pathology, First Affiliated Hospital of xi'An Jiaotong University, Xi'an; 710061, China; (3) Changshu Institute of Technology, Suzhou; 215500, China; (4) School of Computer Science and Engineering, North Minzu University, Yinchuan; 750021, China; (5) Department of Radiology, First Affiliated Hospital of xi'An Jiaotong University, Xi'an; 710061, China; (6) Science and Technology Department, First Affiliated Hospital of xi'An Jiaotong University, Xi'an; 710061, China

Corresponding author:Liang, Ting(liangting31500@126.com)

Source title:Computational and Mathematical Methods in Medicine

Abbreviated source title:Comp. Math. Methods Med.

Volume:2021

Issue date:2021

Publication year:2021

Article number:3859386

Language:English

ISSN:1748670X

E-ISSN:17486718

Document type:Journal article (JA)

Publisher:Hindawi Limited

Abstract:<div data-language="eng" data-ev-field="abstract">Because pulmonary vascular lesions are harmful to the human body and difficult to detect, computer-assisted diagnosis of pulmonary blood vessels has become the focus and difficulty of the current research. An algorithm of pulmonary vascular segment and centerline extraction which is consistent with the physician's diagnosis process is proposed for the first time. We construct the projection of maximum density, restore the vascular space information, and correct random walk algorithm to satisfy automatic and accurate segmentation of blood vessels. Construct a local 3D model to restrain Hessian matrix when extracting centerline. In order to assist the physician to make a correct diagnosis and verify the effectiveness of the algorithm, we proposed a visual expansion model. According to the 420 high-resolution CT data of lung blood vessels labeled by physicians, the accuracy of segmentation algorithm AOM reached 93%, and the processing speed was 0.05 s/frame, which achieved the clinical application standards.<br/></div> © 2021 Shi Qiu et al.

Number of references:28

Main heading:Blood vessels

Controlled terms:3D modeling - Computer aided diagnosis - Extraction - Blood - Three dimensional computer graphics

Uncontrolled terms:Centerline extraction - Clinical application - Computer assisted diagnosis - High resolution CT - Processing speed - Random walk algorithms - Segmentation algorithms - Vascular lesions

Classification code:461.1 Biomedical Engineering - 461.2 Biological Materials and Tissue Engineering - 723.2 Data Processing and Image Processing - 723.5 Computer Applications - 802.3 Chemical Operations

Numerical data indexing:Percentage 9.30e+01%

DOI:10.1155/2021/3859386

Database:Compendex

Open Access type(s): All Open Access, Gold, Green

Accession number:20210084416

Title:Audio description from image by modal translation network

Authors:Ning, Hailong (1, 2); Zheng, Xiangtao (1); Yuan, Yuan (3); Lu, Xiaoqiang (1)

Author affiliation:(1) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; Shaanxi; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) The Center for OPTical IMagery Analysis and Learning (OPTIMAL), School of the Computer Science, Northwestern Polytechnical University, Xi'an; Shaanxi; 710072, China

Corresponding author:Zheng, Xiangtao

Source title:arXiv

Abbreviated source title:arXiv

Issue date:March 18, 2021

Publication year:2021

Language:English

E-ISSN:23318422

Document type:Preprint (PP)

Publisher:arXiv

Abstract:<div data-language="eng" data-ev-field="abstract">Audio is the main form for the visually impaired to obtain information. In reality, all kinds of visual data always exist, but audio data does not exist in many cases. In order to help the visually impaired people to better perceive the information around them, an image-to-audio-description (I2AD) task is proposed to generate audio descriptions from images in this paper. To complete this totally new task, a modal translation network (MT-Net) from visual to auditory sense is proposed. The proposed MT-Net includes three progressive sub-networks: 1) feature learning, 2) cross-modal mapping, and 3) audio generation. First, the feature learning sub-network aims to learn semantic features from image and audio, including image feature learning and audio feature learning. Second, the cross-modal mapping sub-network transforms the image feature into a cross-modal representation with the same semantic concept as the audio feature. In this way, the correlation of inter-modal data is effectively mined for easing the heterogeneous gap between image and audio. Finally, the audio generation sub-network is designed to generate the audio waveform from the cross-modal representation. The generated audio waveform is interpolated to obtain the corresponding audio file according to the sample frequency. Being the first attempt to explore the I2AD task, three large-scale datasets with plenty of manual audio descriptions are built. Experiments on the datasets verify the feasibility of generating intelligible audio from an image directly and the effectiveness of proposed method.<br/></div> © 2021, CC BY.

Number of references:59

Main heading:Machine learning

Controlled terms:Large dataset - Mapping - Modal analysis - Semantics

Uncontrolled terms:Audio description - Audio features - Cross-modal - Cross-modal representations - Feature learning - Heterogeneous gap - Image features - Image-to-audio-description - Modal translation - Subnetworks

Classification code:405.3 Surveying - 723.2 Data Processing and Image Processing - 921 Mathematics

Database:Compendex

Preprint source website:https://arxiv.org

Preprint ID type:ARXIV

Accession number:20211710256596

Title:Adaptive multiscale feature for object detection

Authors:Yu, Xiaoyong (1, 2); Wu, Siyuan (1); Lu, Xiaoqiang (1); Gao, Guilong (3)

Author affiliation:(1) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; Shaanxi; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Key Laboratory of Ultra-fast Photoelectric Diagnostics Technology, Xi'an Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences (CAS), Xi'an; Shaanxi; 710119, China

Corresponding author:Wu, Siyuan(wusiyuan@opt.ac.cn)

Source title:Neurocomputing

Abbreviated source title:Neurocomputing

Volume:449

Issue date:August 18, 2021

Publication year:2021

Pages:146-158

Language:English

ISSN:09252312

E-ISSN:18728286

CODEN:NRCGEO

Document type:Journal article (JA)

Publisher:Elsevier B.V.

Abstract:<div data-language="eng" data-ev-field="abstract">In object detection, multiscale features are necessary to deal with objects with different size. Using Feature Pyramid Network (FPN) as the backbone network is a very popular paradigm in existing object detectors, we call this paradigm FPN+. However, feature fusion of FPN is insufficient to express object of similar size but different appearance due to the unidirectional feature fusion. We motivate and present Adaptive Multiscale Feature (AMF), a new multiscale feature fusion method with bidirectional feature fusion, using to solve the one-direction fusion of FPN. AMF module fuses multiscale features from two aspects: (1) shattering features by the way of CLSM; (2) fusing features by the way of channel-wise attention. The proposed AMF improves the expression ability of multiscale features of the backbone network, and effectively improves the performance of the object detector. The proposed feature fusion method can be added to all object detector, such as the one-stage detector, the two-stage detector, anchor-based detector and anchor-free based detector. Experimental results on the COCO 2014 dataset show that the proposed AMF module performs the popular FPN based detector. Whether anchored-free based detectors or anchored based detectors, performance of detector can be improved through AMF. And the resulting best model can achieve a very competitive mAP on COCO 2014 dataset.<br/></div> © 2021 Elsevier B.V.

Number of references:40

Main heading:Object detection

Controlled terms:Feature extraction - Object recognition

Uncontrolled terms:Adaptation - Anchor-free - Backbone networks - Classification networks - Feature pyramid - Features fusions - Multi-scale features - Object detectors - Objects detection - Pyramid network

Classification code:723.2 Data Processing and Image Processing

DOI:10.1016/j.neucom.2021.04.002

Funding details: Number: 61702498,62005311, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: XAB2017B15, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2017YFB0502900, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Funding text:This work was supported in part by the National Natural Science Foundation of China under Grant 61702498, in part by the National Key R&D Program of China under Grant 2017YFB0502900, in part by the CAS Light of West China Program under Grant XAB2017B15, in part by the National Natural Science Foundation of China (NSFC) (Grant No. 62005311).

Database:Compendex

Accession number:20204809550114

Title:A MOSFET-based high voltage nanosecond pulse module for the gating of proximity-focused microchannel plate image-intensifier

Authors:Fang, Yuman (1, 2); Gou, Yongsheng (1); Zhang, Minrui (1); Wang, Junfeng (1); Tian, Jinshou (1, 3)

Author affiliation:(1) Key Laboratory of Ultra-fast Photoelectric Diagnostics Technology, Xi'an Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences (CAS), Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China

Corresponding author:Tian, Jinshou(tianjs@opt.ac.cn)

Source title:Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

Abbreviated source title:Nucl Instrum Methods Phys Res Sect A

Volume:987

Issue date:January 21, 2021

Publication year:2021

Article number:164799

Language:English

ISSN:01689002

CODEN:NIMAER

Document type:Journal article (JA)

Publisher:Elsevier B.V.

Abstract:Gate modules based on avalanche technology for photocathode gating to proximity-focused microchannel-plate image intensifier (MCPII) are often limited to short gate exposures. A nanosecond pulse module based on MOSFET devices has been demonstrated at our lab, which is capable of generating pulses of adjustable full width at half maximum (FWHM) from 3 ns to D.C. operation with 1 ns switching time and a burst repetition rate up to 4 MHz. A method of supplying gate-current pulses to the MOSFET device is adopted to increase the switching speed based on the totem pole driver. Nanosecond optical gating time of an 18-mm proximity-focused MCPII with a metallic underlay photocathode was obtained. A MCPII with standard multi-alkali photocathode was analyzed for comparison. Moreover, a photocathode-MCP model based on the Finite Integral Technique (FIT) is developed to investigate the dependence of the gating time on the sheet resistance of the photocathode.<br/> © 2020 Elsevier B.V.

Number of references:24

Main heading:MOSFET devices

Controlled terms:Pulse repetition rate - Microchannels - Photocathodes - Image intensifiers (solid state) - Image storage tubes

Uncontrolled terms:Burst repetition rate - Finite integral techniques - High voltage nanosecond pulse - Micro channel plate - Model-based OPC - Nanosecond pulse - Optical gatings - Switching speed

Classification code:714.1 Electron Tubes - 714.2 Semiconductor Devices and Integrated Circuits - 741.3 Optical Devices and Systems - 744.1 Lasers, General

Numerical data indexing:Frequency 4.00e+06Hz, Size 1.80e-02m, Time 1.00e-09s

DOI:10.1016/j.nima.2020.164799

Database:Compendex

Accession number:20212010370841

Title:Non-Invasive Measurement for Cardiac Variations Using a Fiber Optic Sensor

Authors:Lyu, Weimin (1); Xu, Wei (2, 3); Yang, Fangang (4); Chen, Shuyang (5); Tan, Fengze (1); Yu, Changyuan (5)

Author affiliation:(1) Shenzhen Research Institute, Hong Kong Polytechnic University, Shenzhen, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China; (4) Department of Electrical and Computer Engineering, National University of Singapore, Singapore; (5) Department of Electronic and Information Engineering, Hong Kong Polytechnic University, Hong Kong

Corresponding author:Yu, Changyuan(changyuan.yu@polyu.edu.hk)

Source title:IEEE Photonics Technology Letters

Abbreviated source title:IEEE Photonics Technol Lett

Volume:33

Issue:18

Issue date:September 15, 2021

Publication year:2021

Pages:990-993

Article number:9427109

Language:English

ISSN:10411135

E-ISSN:19410174

CODEN:IPTLEL

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">Cardiovascular diseases (CVDs) are very common in modern society, such as atherosclerosis, hypertension, etc., which have a great impact on heart function. Therefore, hospitalization monitoring alone is far from enough. Long-term monitoring of the heart is needed in daily life. The technology of non-invasive monitoring of the cardiovascular system can meet the needs of long-term monitoring of the heart condition, helping to promote the improvement of lifestyle and daily care, reducing the overall risk of developing CVDs. The purpose of this study is to investigate the cardiac response after different exercises using a 3\times 3 demodulation scheme-based ballistocardiography (BCG) monitoring system. A fiber optic sensor (FOS)-based smart cushion is used to replace the traditional inconvenient electrocardiogram (ECG) for heart rate variability (HRV). The correlation between BCG inter-beat interval (IBI) and ECG IBI is 0.9862, and the RMSE is 0.0139. The BCG signal can assess cardiac contractility by analyzing RJ interval with ECG, which is a practical alternative to the pre-ejection period (PEP).<br/></div> © 1989-2012 IEEE.

Number of references:18

Main heading:Fiber optic sensors

Controlled terms:Fiber optics - Electrocardiograms - Heart - Optical fibers - Diseases - Biosensors

Uncontrolled terms:Ballistocardiography - Cardiac contractility - Cardio-vascular disease - Heart rate variability - Long term monitoring - Monitoring system - Non- invasive measurements - Non-invasive monitoring

Classification code:461.2 Biological Materials and Tissue Engineering - 462.1 Biomedical Equipment, General - 741.1.2 Fiber Optics

DOI:10.1109/LPT.2021.3078757

Funding details: Number: 15200718, Acronym: -, Sponsor: -;Number: 61971372, Acronym: NNSFC, Sponsor: National Natural Science Foundation of China;Number: -, Acronym: RGC, UGC, Sponsor: Research Grants Council, University Grants Committee;

Funding text:Manuscript received February 14, 2021; revised May 2, 2021; accepted May 6, 2021. Date of publication May 10, 2021; date of current version August 13, 2021. This work was supported in part by the National Natural Science Foundation of China under Grant 61971372 and in part by the Research Grants Council, University Grants Committee of Hong Kong under Grant 15200718. (Weimin Lyu and Wei Xu contributed equally to this work.) (Corresponding author: Changyuan Yu.) Weimin Lyu and Fengze Tan are with the Shenzhen Research Institute, The Hong Kong Polytechnic University, Shenzhen 518057, China (e-mail: weimin.lyu@connect.polyu.hk; f.z.tan@connect.polyu.hk).

Database:Compendex

Accession number:20211910345766

Title:A driver-assistance algorithm based on multi-feature fusion

Authors:Zhou, Dongmei (1); Qiu, Shi (2); Song, Yang (3)

Author affiliation:(1) Chengdu University of Technology, College of Information Science & Technology, China; (2) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) High Technology Research and Development Center of the Ministry of Science and Technology, Beijing, China

Corresponding author:Qiu, Shi(qiushi215@163.com)

Source title:Infrared Physics and Technology

Abbreviated source title:Infrared Phys Technol

Volume:116

Issue date:August 2021

Publication year:2021

Article number:103747

Language:English

ISSN:13504495

CODEN:IPTEEY

Document type:Journal article (JA)

Publisher:Elsevier B.V.

Abstract:<div data-language="eng" data-ev-field="abstract">The lane line is difficult to be distinguished in visible light for driver assistance, so a multi-feature fusion model is built from the perspective of infrared images to realize assistant driving. Firstly, the features of infrared imaging are analyzed, and the Enet network is improved to focus on the area of the lane line and locate the passable area. Then, the previous vehicle is located to guide the current vehicle based on the fuzzy set theory. Finally, a spatiotemporal association model is constructed. By constructing the relationship between the guiding vehicle and spatiotemporal traffic, the relationship between human-computer interaction is indirectly established to guide vehicle assisted driving. Our experimental results show that the proposed algorithm is in line with the manual driving process, and good results can be achieved under complex road conditions.<br/></div> © 2021

Number of references:35

Main heading:Vehicles

Controlled terms:Automobile drivers - Fuzzy set theory - Human computer interaction - Image fusion - Thermography (imaging) - Fuzzy sets

Uncontrolled terms:'current - Driver assistance - Enet - Fusion model - Fuzzy-set theory - Lane line - Multi-feature fusion - Spatiotemporal association - Vehicle guidance - Visible light

Classification code:432 Highway Transportation - 723.2 Data Processing and Image Processing - 742.1 Photography - 912.4 Personnel - 921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory

DOI:10.1016/j.infrared.2021.103747

Funding details: Number: 2020M682144, Acronym: -, Sponsor: China Postdoctoral Science Foundation;

Funding text:This work is supported by Postdoctoral Science Foundation of China under Grant No. 2020M682144.

Database:Compendex

Accession number:20212510544783

Title:Design and Realization of Visible/LWIR Dual-color Common Aperture Optical System

Title of translation:可见/红外双色共孔径光学系统设计及实现

Authors:Ma, Zhanpeng (1, 2); Xue, Yaoke (1, 4, 5); Shen, Yang (1); Zhao, Chunhui (3); Zhou, Canglong (1, 2); Lin, Shangmin (1, 2); Wang, Hu (1, 2)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanism, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Beijing Institute of Control Engineering, Beijing; 100190, China; (4) Youth Innovation Promotion Association, Beijing; 100037, China; (5) Beijing University of Aeronautics and Astronautics, Beijing; 100191, China

Corresponding author:Wang, Hu(wanghu@opt.ac.cn)

Source title:Guangzi Xuebao/Acta Photonica Sinica

Abbreviated source title:Guangzi Xuebao

Volume:50

Issue:5

Issue date:May 25, 2021

Publication year:2021

Article number:0511002

Language:Chinese

ISSN:10044213

CODEN:GUXUED

Document type:Journal article (JA)

Publisher:Chinese Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">In order to solve the problems of poor imaging quality, complex structure and large volume of existing dual-band common aperture cameras, a visible/long-wave infrared dual-color optical system was proposed. Simultaneous imaging is achieved by sharing the front-end reflection structure in the two bands and adding a dichroic beam splitter on the back of the main mirror, thereby ensuring the compactness of the system structure. The influence of the dichroic beam splitter on the infrared band imaging was analyzed in detail, as well as the influence of different angles of the dichroic beam splitter from vertical direction. The correct system of long wave infrared band and the image plane were eccentrically processed by -2.39 mm, so the image quality of the infrared band was greatly improved. The validity of the analysis conclusion was verified by the field test imaging. The results show that the system has loose tolerances, simple structure, and a few optical components. This system has the advantages of easy processing, installation, and strong engineering feasibility, which can effectively improve the target detection and recognition capabilities of the camera.<br/></div> © 2021, Science Press. All right reserved.

Number of references:16

Main heading:Optical systems

Controlled terms:Optical beam splitters - Cameras - Light polarization - Structure (composition) - Optical design - Infrared devices - Prisms

Uncontrolled terms:Complex structure - Dichroic beamsplitter - Engineering feasibility - Long wave infrared bands - Optical components - Simultaneous imaging - Target detection and recognition - Vertical direction

Classification code:741.1 Light/Optics - 741.3 Optical Devices and Systems - 742.2 Photographic Equipment - 951 Materials Science

Numerical data indexing:Size -2.39e-03m

DOI:10.3788/gzxb20215005.0511002

Funding details: Number: 11803075, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:item：National Natural Science Foundation of China（No.11803075）

Database:Compendex

Accession number:20213310777740

Title:Experimental Demonstration of Nonlinear Scattering Processes in a Microbottle Resonator Based on a Robust Packaged Platform

Authors:Wang, Mengyu (1); Yang, Yu (2); Lu, Zhizhou (3); Wang, Weiqiang (3); Zhang, Wenfu (3); Xie, Chengfeng (1); Zhong, Huikai (1); Wu, Lingfeng (1); Wu, Tao (1); Tan, Qinggui (4); Fu, Yanjun (1); Wang, Keyi (2)

Author affiliation:(1) Key Laboratory of Nondestructive Test (Ministry of Education), Nanchang Hangkong University, Nanchang, China; (2) Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, China; (3) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences, Xi'an, China; (4) National Key Laboratory of Science and Technology on Space Microwave, China Academy of Space Technology, Xi'an, China

Corresponding author:Wang, Mengyu(mengyu@mail.ustc.edu.cn)

Source title:Journal of Lightwave Technology

Abbreviated source title:J Lightwave Technol

Volume:39

Issue:18

Issue date:September 15, 2021

Publication year:2021

Pages:5917-5924

Language:English

ISSN:07338724

E-ISSN:15582213

CODEN:JLTEDG

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">Microbottle resonators (MBR) have attracted research interest for studying nonlinear optical interactions in last two decades, due to the ultra-tight optical confinement in spaces of three dimensions. In this paper, silica MBRs exhibiting rich resonant modes with ultra-high quality factor up to 3.73 \times {10^8} are demonstrated, based on which a portable and robust packaged platform with a tapered fiber coupling is established. Such a packaged platform effectively avoids external perturbations such as air flow and tiny mechanical vibrations, which supports our experimental demonstration of nonlinear scattering effects including four-wave mixing (FWM), simulated Raman scattering, and simulated Brillouin scattering. As a result, Raman-assisted FWM and Brillouin-assisted FWM are observed due to the strong field enhancement in the MBR. In a further investigation, a Kerr frequency comb with broad bandwidth of &sim;200 nm and a Raman-assisted comb with a bandwidth up to &sim;50 nm is achieved, correspondingly. Our works show the versatility of MBR for fundamental research and may open a new route to the development of practical applications in frequency conversion, spectroscopy and communications.<br/></div> © 1983-2012 IEEE.

Number of references:35

Main heading:Four wave mixing

Controlled terms:Vibrations (mechanical) - Silica - Microresonators - Bandwidth - Brillouin scattering

Uncontrolled terms:Experimental demonstrations - External perturbations - Fundamental research - Nonlinear optical interactions - Nonlinear scattering - Optical confinement - Simulated Brillouin scattering - Simulated raman scattering

Classification code:716.1 Information Theory and Signal Processing - 741.1 Light/Optics - 744.7 Laser Components - 931.1 Mechanics

DOI:10.1109/JLT.2021.3092636

Funding details: Number: 51865040,61775209,61801129, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 20192BBH80019,20202BABL212002,20202BABL212011,20202BABL212013, Acronym: -, Sponsor: Natural Science Foundation of Jiangxi Province;Number: GJJ190509, Acronym: -, Sponsor: Education Department of Jiangxi Province;

Funding text:Manuscript received April 12, 2021; revised June 3, 2021; accepted June 23, 2021. Date of publication June 25, 2021; date of current version September 18, 2021. This work was supported in part by the National Natural Science Foundation of China under Grants 61775209, 61801129, and 51865040, in part by the Natural Science Foundation of Jiangxi Province of China, under Grants 20192BBH80019, 20202BABL212011, 20202BABL212002, and 20202BABL212013, and in part by the Science and Technology Project of Jiangxi Provincial Department of Education under Grant GJJ190509. (Mengyu Wang, Yu Yang, and Zhizhou Lu contributed equally to this work.) (Corresponding author: Mengyu Wang.) Mengyu Wang, Chengfeng Xie, Huikai Zhong, Lingfeng Wu, Tao Wu, and Yanjun Fu are with the Key Laboratory of Nondestructive Test (Ministry of Education), Nanchang Hangkong University, Nanchang 330063, China (e-mail: mengyu@mail.ustc.edu.cn; xcf@nchu.edu.cn; huikaiz@nchu.edu.cn; 70813@nchu.edu.cn; wutccnu@nchu.edu.cn; 23021@nchu.edu.cn).

Database:Compendex

Accession number:20214711218115

Title:Development of a 36-element piezoelectric deformable mirror for synchrotron radiation and its surface control ability

Title of translation:同步辐射用36单元压电变形镜研制及其面形调控研究

Authors:Yuan, De-Bo (1); Xu, Liang (2); Zhang, Wen-Bin (3); Zhou, Zhi-Yong (3); Dong, Xiao-Hao (4); Liu, Zheng-Kun (1); Zhang, Guo-Bin (1)

Author affiliation:(1) National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei; 230029, China; (2) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai; 200050, China; (4) Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai; 201204, China

Corresponding author:Zhang, Guo-Bin(gbzhang@ustc.edu.cn)

Source title:Chinese Optics

Abbreviated source title:Chin. Opt.

Volume:14

Issue:6

Issue date:November 2021

Publication year:2021

Pages:1362-1367

Language:Chinese

ISSN:20971842

Document type:Journal article (JA)

Publisher:Editorial Office of Chinese Optics

Abstract:<div data-language="eng" data-ev-field="abstract">Ultra-high quality optical elements are demanded by beamlimes on fourth-generation synchrotron facilities and free-electron laser facilities. A bimorph mirror is effectively used to achieve ultra-high-precision surface profile control and wavefront correction, yet it's one of the bottlenecks of domestic techniques and must be overcome. In order to accomplish this, a 200 mm long bimorph mirror with 36 elements of piezoelectric actuators was developed. The structure parameters of the bimorph mirror were optimized by numerical simulation, and the bimorph mirror was fabricated by domestic technology. The test results show that the surface profile error and slope error of the bimorph mirror can be reduced to 1.38 nm (rms) and 240 nrad (rms), thus the nanoscale control of the mirror surface profile was realized.<br/></div> © 2021, China Science Publishing & Media LTD. All right reserved.

Number of references:22

Main heading:Synchrotron radiation

Controlled terms:Adaptive optics - Electrons - Errors - Free electron lasers - Mirrors - Piezoelectric actuators - Synchrotrons

Uncontrolled terms:Bimorph mirrors - Deformable mirrors - Fourth generation - High quality - Piezoelectric - Profile error - Surface controls - Surface profile error - Surface profiles - Ultra-high

Classification code:704.1 Electric Components - 732 Control Devices - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 744.5 Free Electron Lasers - 932.1.1 Particle Accelerators

Numerical data indexing:Size 1.38E-09m, Size 2.00E-01m

DOI:10.37188/CO.2021-0103

Funding details: Number: 2016YFA0401004, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Funding text:收稿日期：2021-05-10；修订日期：2021-05-26 基金项目：国家重点研发计划（No. 2016YFA0401004） Supported by National Key R&D Program of China (No. 2016YFA0401004)

Database:Compendex

Accession number:20220611611347

Title:Experimental Research on Laser Active Coherent Array Imaging through Horizontal Transimission in Real Atmosphere

Title of translation:真实大气环境下水平方向激光主动相干阵列成像实验研究

Authors:Zhang, Yu (1, 2, 3, 4); Li, Zhiguo (1, 2, 3, 4); Liu, Hui (1, 2, 3); Chen, Minglai (1, 2, 3); Luo, Xiujuan (1, 2, 3); Ma, Caiwen (1, 2, 3); Zhang, Huaili (5)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Science, Xi'an; 710119, China; (2) Key Lab of Space Precision Measurement Technology, Chinese Academy of Science, Xi'an; 710119, China; (3) University of Chinese Academy of Science, Beijing; 100084, China; (4) Pilot National Laboratory for marine science and technology, Qingdao; 266200, China; (5) Space Engineering University, Beijing; 101499, China

Corresponding author:Zhang, Huaili(18786698@qq.com)

Source title:Guangzi Xuebao/Acta Photonica Sinica

Abbreviated source title:Guangzi Xuebao

Volume:50

Issue:12

Issue date:December 25, 2021

Publication year:2021

Pages:49-59

Language:Chinese

ISSN:10044213

CODEN:GUXUED

Document type:Journal article (JA)

Publisher:Chinese Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">In order to study laser array in the whole atmosphere turbulence coherent imaging ability, on the basis of all phase method such as closure, the atmospheric refractive index structure constant of HV57 model is used to calibrate the atmospheric coherence length, through the local wind speed and light road height to calculate the experimental parameters, such as local equivalent whole layer of the atmospheric turbulence level transmission distance. A laser coherent emission array with a diameter of 1.5 m equivalent aperture is developed, and the imaging experiment of a 1.2 km distant object is carried out. The imaging resolution reaches sub-arcsecond level. It is verified that the laser coherent array imaging system can suppress the influence of atmospheric turbulence and provide theoretical and technical support for the development of solid laser coherent array imaging system in the future.<br/></div> © 2021, Science Press. All right reserved.

Number of references:18

Main heading:Image reconstruction

Controlled terms:Imaging systems - Atmospheric structure - Atmospheric thermodynamics - Atmospheric turbulence - Refractive index - Wind

Uncontrolled terms:Active illumination - Active illumination imaging - Array imaging - Coherent array - Experimental research - Fourier - Fourier telescope - Images reconstruction - Laser arrays - Laser coherent array

Classification code:443.1 Atmospheric Properties - 631.1 Fluid Flow, General - 641.1 Thermodynamics - 741.1 Light/Optics - 746 Imaging Techniques

Numerical data indexing:Size 1.20E+03m, Size 1.50E+00m

DOI:10.3788/gzxb20215012.1201004

Funding details: Number: 61505248, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:National Science Foundation of China (No. 61505248)

Database:Compendex

Accession number:20212910660394

Title:Two-stream network for infrared and visible images fusion

Authors:Liu, Luolin (1, 2); Chen, Mulin (3); Xu, Mingliang (4); Li, Xuelong (3, 5)

Author affiliation:(1) Shaanxi Key Laboratory of Ocean Optics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) School of Artificial Intelligence, Optics and Electronics (iOPEN), Northwestern Polytechnical University, Xi'an; Shaanxi; 710072, China; (4) School of Information Engineering, Zhengzhou University, Zhengzhou; 450001, China; (5) Key Laboratory of Intelligent Interaction and Applications (Northwestern Polytechnical University), Ministry of Industry and Information Technology, Xi'an 710072, China

Corresponding author:Li, Xuelong(li@nwpu.edu.cn)

Source title:Neurocomputing

Abbreviated source title:Neurocomputing

Volume:460

Issue date:October 14, 2021

Publication year:2021

Pages:50-58

Language:English

ISSN:09252312

E-ISSN:18728286

CODEN:NRCGEO

Document type:Journal article (JA)

Publisher:Elsevier B.V.

Abstract:<div data-language="eng" data-ev-field="abstract">Long-wave infrared(thermal) images distinguish the target and background according to different thermal radiation. They are insensitive to light conditions, and cannot present details obtained from reflected light. By contrast, the visible images have high spatial resolution and texture details, but they are easily affected by the occlusion and light conditions. Combining the advantages of the two sources may generate a new image with clear targets and high resolution, which satisfy requirements in all-weather and all-day/night conditions. Most of the existing methods cannot fully capture the underlying characteristics in the infrared and visible images, and ignore complementary information between the sources. In this paper, we propose an end-to-end model (TSFNet) for infrared and visible image fusion, which is able to handle the sources simultaneously. In addition, it adopts an adaptive weight allocation strategy to capture the informative global features. Experiments on public datasets demonstrate the proposed fusion method achieves state-of-the-art performance, in both global visual quality and quantitative comparison.<br/></div> © 2021

Number of references:29

Main heading:Image fusion

Controlled terms:Infrared radiation - Textures - Infrared imaging

Uncontrolled terms:Infrared and visible image - Infrared thermal image - Light conditions - Longwave infrared - Stream networks - Target and background - Thermal - Thermal images - Two-stream - Two-stream network

Classification code:723.2 Data Processing and Image Processing - 741.1 Light/Optics - 746 Imaging Techniques

DOI:10.1016/j.neucom.2021.05.034

Funding details: Number: 61871470, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: QYZDY-SSW-JSC044, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2018AAA0102200, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Funding text:This work was supported by National Key Research and Development Program of China under Grant 2018AAA0102200, Key Research Program of Frontier Sciences, Chinese Academy of Sciences under Grant QYZDY-SSW-JSC044, and National Natural Science Foundation of China under Grant 61871470.

Database:Compendex

Accession number:20210117262

Title:Effect of near-field distribution on transmission characteristics of fiber-fed Fabry-Perot etalons

Authors:Hao, Jun (1, 2, 3); Tang, Liang (1, 2); Ye, Huiqi (1, 2); Hao, Zhibo (1, 2, 3); Han, Jian (1, 2); Zhai, Yang (1, 2); Zhang, Kai (1, 2); Wei, Ruyi (4); Xiao, Dong (1, 2)

Author affiliation:(1) National Astronomical Observatories, Nanjing Institute of Astronomical Optics & Technology, Chinese Academy of Sciences, Nanjing; 210042, China; (2) CAS Key Laboratory of Astronomical Optics Technology, Nanjing Institute of Astronomical Optics & Technology, Nanjing; 210042, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China; (4) Xi'an Institute of Optics & Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China

Corresponding author:Ye, Huiqi(hqye@niaot.ac.cn)

Source title:arXiv

Abbreviated source title:arXiv

Issue date:May 10, 2021

Publication year:2021

Language:English

E-ISSN:23318422

Document type:Preprint (PP)

Publisher:arXiv

Abstract:<div data-language="eng" data-ev-field="abstract">Fiber-fed etalons are widely employed in advanced interferometric instruments such as gravitational-wave detectors, ultrastable lasers and calibration reference for high-precision spectrographs. We demonstrate that variation in near-field distribution of the feeding fiber would deteriorate the spectrum precision of the fiber-fed Fabry-Perot etalon, especially when precision at the order of 3 × 10<sup>−10</sup> or higher is required. The octagonal fiber reinforced with double scrambler could greatly improve the steadiness and uniformness of the near-field distribution. When building wavelength calibrators for sub-m s<sup>−1</sup> precision radial-velocity instruments, the double scrambler should be considered meticulously.<br/></div> Copyright © 2021, The Authors. All rights reserved.

Number of references:24

Main heading:Fibers

Controlled terms:Etalons - Fabry-Perot interferometers - Gravitational effects - Gravity waves

Uncontrolled terms:Fabry-perot etalon - Fabry-perot interferometer (524) - Gravitational waves detectors - Interferometric instruments - Near-field distribution - Radial velocity - Radial velocity(1332) - Spectral energy distribution - Spectral energy distribution (2129) - Transmission characteristics

Classification code:931.5 Gravitation, Relativity and String Theory - 941.3 Optical Instruments

Database:Compendex

Preprint source website:https://arxiv.org

Preprint ID type:ARXIV

Accession number:20214911281796

Title:Emergence of Laser Cavity-Solitons in a Microresonator-Filtered Fiber Laser

Authors:Rowley, Maxwell (1); Henry Hanzard, Pierre (1); Cutrona, Antonio (1); Chu, Sai T. (2); Little, Brent E. (3); Morandotti, Roberto (4, 5); Moss, David J. (6); Sebastian Totero Gongora, Juan (1); Peccianti, Marco (1); Pasquazi, Alessia (1)

Author affiliation:(1) University of Sussex, Emergent Photonics (Epic) Lab, Dept. of Physics and Astronomy, BN1 9QH, United Kingdom; (2) City University of Hong Kong, Department of Physics, Hong Kong, Hong Kong; (3) Xi'An Institute of Optics and Precision Mechanics, CAS, State Key Laboratory of Transient Optics and Photonics, Xi'an, China; (4) INRS-EMT, Varennes; QC, Canada; (5) Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology, Chengdu, China; (6) Swinburne University of Technology, Sciences Centre, Hawthorn; VIC; 3122, Australia

Source title:2021 Conference on Lasers and Electro-Optics, CLEO 2021 - Proceedings

Abbreviated source title:Conf. Lasers Electro-Opt., CLEO - Proc.

Part number:1 of 1

Issue title:2021 Conference on Lasers and Electro-Optics, CLEO 2021 - Proceedings

Issue date:May 2021

Publication year:2021

Language:English

ISBN-13:9781943580910

Document type:Conference article (CA)

Conference name:2021 Conference on Lasers and Electro-Optics, CLEO 2021

Conference date:May 9, 2021 - May 14, 2021

Conference location:Virtual, Online, United states

Conference code:173264

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">The parameter space, defined by simple global controls, is probed in a microresonator-filtered fiber laser. We identify a distinct region that clearly admits solitons and we investigate the role of slow nonlinearities in their emergence.<br/></div> © 2021 OSA.

Number of references:6

Main heading:Microresonators

Controlled terms:Fiber lasers - Optical fibers - Solitons

Uncontrolled terms:Cavity solitons - Global control - Micro resonators - Parameter spaces - Simple++

Classification code:741.1 Light/Optics - 741.1.2 Fiber Optics - 744.4 Solid State Lasers - 744.7 Laser Components

Database:Compendex

Accession number:20210309774632

Title:Accelerating patch-based low-rank image restoration using kd-forest and Lanczos approximation

Authors:Guo, Qiang (1, 2); Zhang, Yongxia (1, 2); Qiu, Shi (3); Zhang, Caiming (4)

Author affiliation:(1) School of Computer Science and Technology, Shandong University of Finance and Economics, Jinan; 250014, China; (2) Shandong Provincial Key Laboratory of Digital Media Technology, Jinan; 250014, China; (3) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (4) School of Software, Shandong University, Jinan; 250100, China

Corresponding author:Guo, Qiang(guoqiang@sdufe.edu.cn)

Source title:Information Sciences

Abbreviated source title:Inf Sci

Volume:556

Issue date:May 2021

Publication year:2021

Pages:177-193

Language:English

ISSN:00200255

CODEN:ISIJBC

Document type:Journal article (JA)

Publisher:Elsevier Inc.

Abstract:Patch-based low-rank approximation (PLRA) via truncated singular value decomposition is a powerful and effective tool for recovering the underlying low-rank structure in images. Generally, it first performs an approximate nearest neighbors (ANN) search algorithm to group similar patches into a collection of matrices with reshaping them as vectors. The inherent correlation among similar patches makes these matrices have a low-rank structure. Then the singular value decomposition (SVD) is used to derive a low-rank approximation of each matrix by truncating small singular values. However, the conventional implementation of patch-based low-rank image restoration suffers from high computational cost of the ANN search and full SVD. To address this limitation, we propose a fast approximation method that accelerates the computation of PLRA using multiple kd-trees and Lanczos approximation. The basic idea of this method is to exploit an index kd-tree built from patch samples of the observed image and several small kd-trees built from overlapping regions of the image to accelerate the search for similar patches, and apply the Lanczos bidiagonalization procedure to obtain a fast low-rank approximation of patch matrix without computing the full SVD. Experimental results on image denoising and inpainting tasks demonstrate the efficiency and accuracy of our method.<br/> © 2020 Elsevier Inc.

Number of references:50

Main heading:Image reconstruction

Controlled terms:Trees (mathematics) - Approximation theory - Nearest neighbor search - Image denoising - Restoration - Singular value decomposition - Forestry

Uncontrolled terms:Approximate nearest neighbors (ANN) - Computational costs - Fast approximation - Low rank approximations - Overlapping regions - Search Algorithms - Singular values - Truncated singular value decomposition

Classification code:716.1 Information Theory and Signal Processing - 723.2 Data Processing and Image Processing - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 921 Mathematics - 921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory - 921.5 Optimization Techniques - 921.6 Numerical Methods

DOI:10.1016/j.ins.2020.12.066

Funding details: Number: 2019KJN045, Acronym: -, Sponsor: -;Number: 61802229,61873145,U1609218, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: -, Acronym: HKU, Sponsor: University of Hong Kong;Number: ZR2017JL029,ZR2018BF007, Acronym: -, Sponsor: Natural Science Foundation of Shandong Province;

Funding text:The authors would like to thank Prof. Jiaye Wang with Shandong University, Prof. Wenping Wang with the University of Hong Kong, and the anonymous reviewers for their insightful comments and suggestions that are helpful to improve the quality of this paper. This work was supported by National Natural Science Foundation of China (61873145, 61802229), NSFC Joint Fund with Zhejiang under Key Project (U1609218), Natural Science Foundation of Shandong Province for Excellent Young Scholars (ZR2017JL029), Natural Science Foundation of Shandong Province (ZR2018BF007), and Science and Technology Innovation Program for Distinguished Young Scholars of Shandong Province Higher Education Institutions (2019KJN045).

Database:Compendex

Accession number:20213210735699

Title:Verification study for the mineral and rock identification using multispectral camera of the "Zhurong" Mars Rover on the earth

Title of translation:"祝融号"火星车多光谱相机岩矿类型识别的地面验证研究

Authors:Xie, Juan (1, 2, 3); Yan, Kai (1, 2, 3); Kang, Zhizhong (1, 2, 3); Xu, Xiaojian (1, 2, 3); Xue, Bin (4); Yang, Jianfeng (4); Tao, Jinyou (4)

Author affiliation:(1) School of land science and technology, China University of Geosciences, Beijing; 100083, China; (2) Lunar and Planetary Remote Sensing Exploration Research Center, China University of Geosciences, Beijing; 100083, China; (3) International Cooperative Research Center for Lunar and Planetary Exploration, Center of Space Exploration, Ministry of Education, Beijing; 100083, China; (4) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China

Corresponding author:Kang, Zhizhong(zzkang@cugb.edu.cn)

Source title:National Remote Sensing Bulletin

Abbreviated source title:National Remote Sensing Bulletin

Volume:25

Issue:7

Issue date:July 25, 2021

Publication year:2021

Pages:1385-1399

Language:Chinese

ISSN:10074619

Document type:Journal article (JA)

Abstract:<div data-language="eng" data-ev-field="abstract">China's first autonomous Mars exploration mission probe "Tianwen-1" was successfully launched in July 2020, and the rover of "Tianwen-1" successfully landed on the pre-selected landing area in the southern Utopia Plain of Mars on May 15. After landing on Mars, China's first Mars rover "Zhurong" will carry out inspections and bring the raw scientific data for Chinese Mars exploration. The multispectral camera mounted on the "Zhurong" rover can be used to study the types of mineral and rock near the landing area. Identifying the types of mineral and rock on Mars is of great significance for understanding the Martian atmospheric change, environmental conditions, geological evolution, and future livability. The study in this article selected 18 kinds of common mineral and rock on the surface of Mars, and shot these mineral and rock with the same multispectral camera as on "Zhurong" rover in the earth environment. Then, this study uses the obtained multispectral image carry out the research of mineral and rock identification, hoping to provide guidance for future in-situ identification of mineral and rock on the surface of Mars based on the "Zhurong" multispectral camera data. Considering that 8-band spectral data is not enough to capture the spectral characteristics of all mineral and rock, it will result in fewer mineral and rock identified, this paper uses color features to assist in the identification of mineral and rock. This paper uses band operation based on multispectral image and HSV color feature histogram extraction based on color image to identify different types of mineral and rock. The above method can identify different types of mineral and rock from the perspective of multispectral features and color features. This study collected multispectral images of mineral and rock under three different shooting conditions, and found that the spectral characteristics of mineral and rock may change under different shooting conditions, which will have an impact on mineral and rock identification. The multispectral image data used in this paper was collected under the conditions of the solar elevation angle at about 60 °, the shooting height at 1.8 meters and the shooting angle at about 37°. Under this condition, the research method in this paper has extracted identification indexes of 12 kinds of mineral and rock. The identification indexes corresponding to specific mineral and rock are listed in the article, all results are based on the above shooting condition. The study shows that: using the band operation based on multispectral image, mineral and rock with prominent spectral characteristics under 8 specific bands can be identified; and using color feature histogram extracted from HSV color image, mineral and rock with a relatively concentrated color feature can be identified. In addition, since different shooting conditions will have an impact on the identification of mineral and rock, it is necessary to do the identification research under different conditions in the future.<br/></div> © 2021, Science Press. All right reserved.

Number of references:26

Main heading:Minerals

Controlled terms:Color - Rovers - Martian surface analysis - Cameras - Landing - Rocks

Uncontrolled terms:Environmental conditions - Geological evolution - Histogram extraction - Multi-spectral cameras - Multi-spectral image data - Multispectral images - Shooting conditions - Spectral characteristics

Classification code:482.2 Minerals - 655.1 Spacecraft, General - 741.1 Light/Optics - 742.2 Photographic Equipment

Numerical data indexing:Size 1.80e+00m

DOI:10.11834/jrs.20211065

Funding details: Number: 2019YFE0123300, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;Number: Z191100004319001, Acronym: -, Sponsor: Beijing Science and Technology Planning Project;

Funding text:Abstract：C hina’ s first autonomous Mars exploration mission probe"Tianwen-1" was successfully launched in July 2020, and the rover of "Tianwen-1" successfully landed on the pre-selected landing area in the southern Utopia Plain of Mars on May 15.After landing on Mars, China’sfirstMarsrover"Zhurong"willcarryoutinspectionsandbringtherawscientificdataforChineseMarsexploration.The multispectral camera mounted on the"Zhurong" rover can be used to study the types of mineral and rock near the landing area. Identifying thetypesofmineralandrockonMarsisofgreatsignificanceforunderstandingtheMartianatmosphericchange,environmentalconditions, geological evolution, and future livability. The study in this article selected 18 kinds of common mineral and rock on the surface of Mars, and shot these mineral and rock with the same multispectral camera as on"Zhurong" rover in the earth environment. Then, this study uses theobtainedmultispectralimagecarryouttheresearchofmineralandrockidentification,hopingtoprovideguidanceforfuturein-situ identification of mineral and rock on the surface of Mars based on the"Zhurong" multispectral camera data. Considering that 8-band spectraldataisnotenoughtocapturethespectralcharacteristicsofallmineralandrock,itwillresultinfewermineralandrockidentified, thispaperusescolorfeaturestoassistintheidentificationofmineralandrock.Thispaperusesbandoperationbasedonmultispectralimage andHSVcolorfeaturehistogramextractionbasedoncolorimagetoidentifydifferenttypesofmineralandrock.Theabovemethodcan identify different types of mineral and rock from the perspective of multispectral features and color features. This study collected multispectralimagesofmineralandrockunderthreedifferentshootingconditions,andfoundthatthespectralcharacteristicsofmineraland rockmaychangeunderdifferentshootingconditions,whichwillhaveanimpactonmineralandrockidentification.Themultispectralimage data used in this paper was collected under the conditions of the solar elevation angle at about 60 °, the shooting height at 1.8 meters and the shooting angle at about 37°. Under this condition, the research method in this paper has extracted identification indexes of 12 kinds of mineral and rock. The identification indexes corresponding to specific mineral and rock are listed in the article, all results are based on the above shooting condition. The study shows that: using the band operation based on multispectral image, mineral and rock with prominent spectralcharacteristicsunder8specificbandscanbeidentified;andusingcolorfeaturehistogramextractedfromHSVcolorimage,mineral androckwitharelativelyconcentratedcolorfeaturecanbeidentified.Inaddition,sincedifferentshootingconditionswillhaveanimpacton theidentificationofmineralandrock,itisnecessarytodotheidentificationresearchunderdifferentconditionsinthefuture. Keywords：T ianwen-1,Zhurong,multispectralimage,bandoperation,colorfeature,mineralandrockidentification Supported by National Key Research and Development Program of China (No.2019YFE0123300); CivilAerospace T echnologyAdvance Research Project of National Defense Science and Engineering (No.D020103); Beijing Science and Technology Project (No. Z191100004319001)Supported by National Key Research and Development Program of China (No.2019YFE0123300); Civil Aerospace Technology Advance Research Project of National Defense Science and Engineering (No.D020103); Beijing Science and Technology Project (No.Z191100004319001)

Database:Compendex

Accession number:20212310467002

Title:Design and characterization of a thermally stabilized fiber Fabry-Perot etalon as a wavelength calibrator for high-precision spectroscopy

Authors:Tang, Liang (1, 2); Ye, Huiqi (1, 2); Hao, Jun (1, 2, 3); Wei, Ruyi (4); Xiao, Dong (1, 2)

Author affiliation:(1) National Astronomical Observatories, Nanjing Institute of Astronomical Optics and Technology, Chinese Academy of Sciences, Nanjing; 210042, China; (2) CAS Key Laboratory of Astronomical Optics and Technology, Nanjing Institute of Astronomical Optics and Technology, Nanjing; 210042, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China; (4) Xi'an Institute of Optics Precision and Mechanic, Chinese Academy of Sciences, Xi'an; 710119, China

Source title:Applied Optics

Abbreviated source title:Appl. Opt.

Volume:60

Issue:19

Issue date:July 1, 2021

Publication year:2021

Pages:D1-D8

Language:English

ISSN:1559128X

E-ISSN:21553165

CODEN:APOPAI

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">Filtering light from a broadband source with a Fabry-Perot etalon generates comb-like peaks in the spectral domain that can serve as calibration reference for precise Doppler shift detection on astronomical spectrographs. Fiber Fabry-Perot etalons are small in size and easily aligned optically. In application, high thermal sensitivity of the fiber core material requires a highly stable temperature control system. Here, we report on the design, characterization, and thermal performance of a fiber Fabry-Perot etalon-based calibrator system insensitive to environmental temperature perturbation, aimed as a reference for m s-1 precision radial velocity measurements. A fast and simple method to estimate the etalon finesse and a dual-loop approach to achieve sub-millikelvin temperature fluctuation are proposed and demonstrated.<br/></div> © 2021 Optical Society of America.

Number of references:19

Main heading:Coremaking

Controlled terms:Etalons - Fabry-Perot interferometers - Fibers

Uncontrolled terms:Astronomical spectrographs - Calibration reference - Environmental temperature - Fabry-Perot etalons - High-precision spectroscopy - Millikelvin temperatures - Radial velocity measurements - Thermal Performance

Classification code:534.2 Foundry Practice - 941.3 Optical Instruments

DOI:10.1364/AO.417586

Funding details: Number: 11727806,11903060, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: -, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2020M671638, Acronym: -, Sponsor: China Postdoctoral Science Foundation;Number: -, Acronym: MOF, Sponsor: Ministry of Finance;Number: -, Acronym: -, Sponsor: Jiangsu Planned Projects for Postdoctoral Research Funds;

Funding text:Acknowledgment. The authors acknowledge support from the Operation, Maintenance, and Upgrading Fund for Astronomical Telescopes and Facility Instruments, budgeted from the Ministry of Finance of China (MOF) and administrated by the Chinese Academy of Sciences (CAS). L. Tang thanks Dr. X. Zhu (NIAOT, CAS) for help with the VIPA measurements.Funding. National Natural Science Foundation of China (11727806, 11903060); China Postdoctoral Science Foundation (2020M671638); Jiangsu Planned Projects for Postdoctoral Research Funds; Ministry of Finance.

Database:Compendex

Accession number:20210609900584

Title:Erratum: Optical spectroscopic characterizations of laser irradiated olivine grains (Astronomy and Astrophysics (2017) 597 (A50) DOI: 10.1051/0004-6361/201629327) (Open Access)

Authors:Yang, Yazhou (1); Zhang, Hao (1, 2); Wang, Ziwei (1); Yuan, Ye (1); Li, Shaolin (3); Hsu, Weibiao (3); Liu, Chujian (4)

Author affiliation:(1) Planetary Science Institute, School of Earth Sciences, China University of Geosciences, Wuhan; 430074, China; (2) Key Laboratory of Spectral Imaging Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, China; (4) State Key Laboratory of Geological Process and Mineral Resources, China University of Geosciences, Wuhan, China

Corresponding authors:Yang, Yazhou(yangyazhou1@gmail.com); Zhang, Hao(um_zhanghao@yahoo.com)

Source title:Astronomy and Astrophysics

Abbreviated source title:Astron. Astrophys.

Volume:646

Issue date:February 1, 2021

Publication year:2021

Article number:C1

Language:English

ISSN:00046361

E-ISSN:14320746

CODEN:AAEJAF

Document type:Erratum (ER)

Publisher:EDP Sciences

Abstract:<div data-language="eng" data-ev-field="abstract">This is a corrigendum to Yang et al. (2017). There is a typo in the Fo (Mg-number) of the olivine sample. The Fo is defined as the molar ratio of Mg/(Mg+Fe). The chemical composition values listed in Table 1 are correct, but the calculated Fo# value should be 91. This has no effect on our results or conclusions. The revised table and paragraph are given below, with the revised parts highlighted in bold. (Table Presented.).<br/></div> © 2021 EDP Sciences. All rights reserved.

DOI:10.1051/0004-6361/201629327e

Database:Compendex

Open Access type(s): All Open Access, Bronze

Accession number:20213410810670

Title:Influence of Channel Center Wavelength Shift of the Hyperspectral Remote Sensor on Red Edge Spectra

Title of translation:高光谱遥感器通道中心波长漂移对红边光谱的影响

Authors:Zhang, Yaqiong (1); Zhang, Wenjuan (2); Chen, Zhengchao (2); Li, Haiwei (3)

Author affiliation:(1) Key Laboratory of Satellite Remote Sensing for National Environmental Protection, Center for Satellite Application on Ecology and Environment, Ministry of Ecology and Environment, Beijing; 100094, China; (2) Airborne Remote Sensing Center, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing; 100094, China; (3) Key Laboratory of Spectral Imaging Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China

Corresponding author:Li, Haiwei(lihaiwei@opt.ac.cn)

Source title:Guangxue Xuebao/Acta Optica Sinica

Abbreviated source title:Guangxue Xuebao

Volume:41

Issue:14

Issue date:July 25, 2021

Publication year:2021

Article number:1428003

Language:Chinese

ISSN:02532239

CODEN:GUXUDC

Document type:Journal article (JA)

Publisher:Chinese Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">We simulated the reflectance of typical vegetation in the red-edge region before and after the channel center wavelength shift of hyperspectral remote sensors to quantitatively examine the effect of the channel center wavelength shift on the red edge spectra. The results show that the channel center wavelength shift leads to many "spike" and "shake" phenomena in the reflectance curves of the red-edge region, and the reflectance curves in the region without characteristic absorption become unsmooth. Moreover, there is a significant linear relationship between the channel center wavelength shift and the red edge position (REP) error (coefficient of determination R<sup>2</sup>=0.99). For a 10 nm hyperspectral remote sensor, when the channel center wavelength shifts are 1 nm, 3 nm, and 5 nm, the maximum errors in red-edge reflectance are 1.46%, 4.49%, and 9.57%, respectively, and the red edge spectra have the obvious "blue shift" phenomenon, with the REP shifting by 0.75 nm, 2.60 nm, and 5.52 nm, respectively. The channel center wavelength shift will lead to the pseudo-shift of the red edge or cause the "covering" or "strengthening" effect on the red edge shift induced by vegetation stress, which will directly affect the monitoring accuracy of vegetation stress based on hyperspectral remote sensing data. Channel center wavelength shift is an important source of the red edge shift. Accurate spectral calibration is the important basis of quantitative application related to the red edge spectra of vegetation.<br/></div> © 2021, Chinese Lasers Press. All right reserved.

Number of references:24

Main heading:Vegetation

Controlled terms:Radiative transfer - Reflection - Red Shift - Remote sensing

Uncontrolled terms:Characteristic absorption - Coefficient of determination - Hyperspectral remote sensing data - Linear relationships - Monitoring accuracy - Red edge reflectance - Spectral calibration - Vegetation stress

Classification code:701 Electricity and Magnetism - 741.1 Light/Optics

Numerical data indexing:Percentage 1.46e+00%, Percentage 4.49e+00%, Percentage 9.57e+00%, Size 1.00e-08m, Size 1.00e-09m, Size 2.60e-09m, Size 3.00e-09m, Size 5.00e-09m, Size 5.52e-09m, Size 7.50e-10m

DOI:10.3788/AOS202141.1428003

Database:Compendex

Accession number:20214811251396

Title:Emergence of laser cavity-solitons in a microresonator-filtered fiber laser

Authors:Rowley, Maxwell (1); Hanzard, Pierre Henry (1); Cutrona, Antonio (1); Chu, Sai T. (2); Little, Brent E. (3); Morandotti, Roberto (4, 5); Moss, David J. (6); Gongora, Juan Sebastian Totero (1); Peccianti, Marco (1); Pasquazi, Alessia (1)

Author affiliation:(1) Emergent Photonics (Epic) Lab, Dept. of Physics and Astronomy, University of Sussex, BN1 9QH, United Kingdom; (2) Department of Physics, City University of Hong Kong, Tat Chee Avenue, Hong Kong, Hong Kong; (3) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, CAS, Xi'an, China; (4) INRS-EMT, 1650 Boulevard Lionel-Boulet, Varennes; QC; J3X 1S2, Canada; (5) Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology, Chengdu, China; (6) Sciences Centre, Swinburne University of Technology, Hawthorn; VIC; 3122, Australia

Corresponding author:Pasquazi, Alessia(a.pasquazi@sussex.ac.uk)

Source title:Optics InfoBase Conference Papers

Abbreviated source title:Opt. InfoBase Conf. Pap

Part number:1 of 1

Issue title:CLEO: Science and Innovations, CLEO:S and I 2021

Issue date:2021

Publication year:2021

Article number:STu2D.5

Language:English

ISBN-13:9781557528209

Document type:Conference article (CA)

Conference name:CLEO: Science and Innovations, CLEO:S and I 2021 - Part of Conference on Lasers and Electro-Optics, CLEO 2021

Conference date:May 9, 2021 - May 14, 2021

Conference location:Virtual, Online, United states

Conference code:174080

Publisher:The Optical Society

Number of references:7

Main heading:Microresonators

Controlled terms:Fiber lasers - Solitons

Uncontrolled terms:Cavity solitons - Global control - Micro resonators - Parameter spaces - Simple++

Classification code:741.1 Light/Optics - 744.4 Solid State Lasers - 744.7 Laser Components

Database:Compendex

Accession number:20214311063944

Title:Emergence of Laser Cavity-Solitons in a Microresonator-Filtered Fiber Laser

Authors:Rowley, Maxwell (1); Hanzard, Pierre-Henry (1); Cutrona, Antonio (1); Chu, Sai T. (2); Little, Brent E. (3); Morandotti, Roberto (4, 5); Moss, David J. (6); Gongora, Juan Sebastian Totero (1); Peccianti, Marco (1); Pasquazi, Alessia (1)

Author affiliation:(1) Emergent Photonics (Epic) Lab, Dept. of Physics and Astronomy, University of Sussex, BN1 9QH, United Kingdom; (2) Department of Physics, City University of Hong Kong, Tat Chee Avenue, Hong Kong, Hong Kong; (3) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, CAS, Xi'an, China; (4) INRS-EMT, 1650 Boulevard Lionel-Boulet, Varennes; QC; J3X 1S2, Canada; (5) Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology, Chengdu, China; (6) Optical Sciences Centre, Swinburne University of Technology, Hawthorn; VIC; 3122, Australia

Source title:2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2021

Abbreviated source title:Conf. Lasers Electro-Opt. Europe Eur. Quantum Electron. Conf., CLEO/Europe-EQEC

Part number:1 of 1

Issue title:2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2021

Issue date:June 2021

Publication year:2021

Language:English

ISBN-13:9781665418768

Document type:Conference article (CA)

Conference name:2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2021

Conference date:June 21, 2021 - June 25, 2021

Conference location:Munich, Germany

Conference code:172135

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">In an open nonlinear system, emergent complex structures are generally determined by a set of global parameters. Cavity-solitons are an example of such structures and, in their temporal form, have seeded the last decade of major developments in microresonator-based optical frequency combs. These optical pulses typically require complex procedures and external feedback to be induced and maintained. Recent progress has seen the microresonators directly embedded into a laser cavity [1] , [2] where it is possible to simply initiate cavity-soliton formation by increasing the laser-diode driving current [3]. Hybrid laser-microresonator schemes have been considered since 2012 [4] , and extremely efficient laser cavity-solitons have been experimentally and theoretically demonstrated in a laser microcomb [5].<br/></div> © 2021 IEEE.

Number of references:5

Main heading:Microresonators

Controlled terms:Fiber lasers - Solitons

Uncontrolled terms:Cavity solitons - Complex procedure - Complexes structure - Driving current - Global parameters - Micro resonators - Optical frequency combs - Optical-frequency combs - Recent progress - Soliton formation

Classification code:741.1 Light/Optics - 744.4 Solid State Lasers - 744.7 Laser Components

DOI:10.1109/CLEO/Europe-EQEC52157.2021.9542409

Database:Compendex

Accession number:20212210426952

Title:Optimal optical path difference of an asymmetric common-path coherent-dispersion spectrometer

Authors:Chen, Shasha (1, 2, 3); Wei, Ruyi (1, 3, 4); Xie, Zhengmao (3); Wu, Yinhua (5); Di, Lamei (1, 3); Wang, Feicheng (1, 3); Zhai, Yang (6, 7)

Author affiliation:(1) CAS Key Laboratory of Spectral Imaging Technology, Xi'an; 710119, China; (2) School of Optoelectronics, University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Xi'an Institute of Optics Precision and Mechanic of Chinese Academy of Sciences, Xi'an; 710119, China; (4) Electronic Information School, Wuhan University, Wuhan; 430072, China; (5) School of Optoelectronics Engineering, Xi'an Technological University, Xi'an; 710021, China; (6) National Astronomical Observatories/Nanjing Institute of Astronomical Optics & Technology, Chinese Academy of Sciences, Nanjing; 210042, China; (7) Key Laboratory of Astronomical Optics and Technology, Nanjing Institute of Astronomical Optics and Technology, Chinese Academy of Sciences, Nanjing; 210042, China

Corresponding author:Wei, Ruyi(ruyiwei@opt.ac.cn)

Source title:Applied Optics

Abbreviated source title:Appl. Opt.

Volume:60

Issue:16

Issue date:June 1, 2021

Publication year:2021

Pages:4535-4543

Language:English

ISSN:1559128X

E-ISSN:21553165

CODEN:APOPAI

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">Optical path difference (OPD) is a very significant parameter in the asymmetric common-path coherent-dispersion spectrometer (CODES), which directly determines the performance of the CODES. In order to improve the performance of the instrument as much as possible, a temperature-compensated optimal optical path difference (TOOPD) method is proposed. The method does not only consider the influence of temperature change on the OPD but also effectively solves the problem that the optimal OPD cannot be obtained simultaneously at different wavelengths. Taking the spectral line with a Gaussian-type power spectral density distribution as a representative, the relational expression between the OPD and the visibility of interference fringes formed by the CODES is derived for the stellar absorption/emission line. Further, the optimal OPD is deduced according to the efficiency function, and the relationship between the optimalOPDand wavelength is analyzed. Then, based on the materials' dispersion characteristics, different optical materials are combined and added to the interferometer's reflected and transmitted optical path to implement the optimalOPDat different wavelengths, thereby improving the detection precision. Meanwhile, the materials whose refractive index negatively changes with temperature are selected to reduce or even offset the temperature impact on OPD, and hence the system's stability is improved and further improves the detection precision. Under certain input conditions, the material combination that approximates the optimal OPD is performed within the range of 0.66-0.9 μm. The simulation results show that the maximal difference between the optimal OPD obtained by the efficiency function and the OPD produced by the material combination is 0.733 mm for the absorption line and 1.122 mm for the emission line, which is reduced by 1 time compared with only one material. The influence of temperature on the OPD can be reduced by 2-3 orders of magnitude by material combination, which greatly ameliorates the stability of the whole spectrometer. Hence, the TOOPD method provides a new idea for further improving the high-precision radial velocity detection of the asymmetric common-pathCODES.<br/></div> ©2021 Optical Society of America.

Number of references:24

Main heading:Efficiency

Controlled terms:Dispersion (waves) - Refractive index - Spectral density - Spectrometers

Uncontrolled terms:Dispersion characteristics - Dispersion spectrometers - Efficiency functions - Material combination - Optical path difference - System's stabilities - Temperature compensated - Visibility of interference fringes

Classification code:741.1 Light/Optics - 741.3 Optical Devices and Systems - 913.1 Production Engineering

Numerical data indexing:Size 1.12e-03m, Size 6.60e-07m to 9.00e-07m, Size 7.33e-04m

DOI:10.1364/AO.425491

Funding details: Number: 11573058,11727806,11973066, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2021JQ-640, Acronym: -, Sponsor: Shantou Science and Technology Project;

Funding text:Funding. National Natural Science Foundation of China (11573058, 11727806); National Natural Science Foundation of China, General Program (11973066); Shaanxi Science and Technology Project (2021JQ-640).

Database:Compendex

Accession number:20211310151075

Title:Scalable wide neural network: A parallel, incremental learning model using splitting iterative least squares (Open Access)

Authors:Xi, Jiangbo (1, 2); Ersoy, Okan K. (3); Fang, Jianwu (4); Cong, Ming (1, 2); Wei, Xin (5, 6); Wu, Tianjun (7)

Author affiliation:(1) College of Geological Engineering and Geomatics, Chang'an University, Xi'an; 710054, China; (2) Key Laboratory of Western China's Mineral Resources and Geological Engineering, Ministry of Education, Xi'an; 710054, China; (3) School of Electrical and Computer Engineering, Purdue University, West Lafayette; IN; 47907, United States; (4) College of Transportation Engineering, Chang'an University, Xi'an; 710064, China; (5) Xi'an Institute of Optics and Precision Mechanics, Cas, Xi'an; 710119, China; (6) School of Electronic Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing; 100039, China; (7) Department of Mathematics and Information Science, College of Science, Chang'an University, Xi'an; 710064, China

Corresponding authors:Ersoy, Okan K.(ersoy@purdue.edu); Fang, Jianwu(fangjianwu@chd.edu.cn)

Source title:IEEE Access

Abbreviated source title:IEEE Access

Volume:9

Issue date:2021

Publication year:2021

Pages:50767-50781

Article number:9386084

Language:English

E-ISSN:21693536

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">With the rapid development of research on machine learning models, especially deep learning, more and more endeavors have been made on designing new learning models with properties such as fast training with good convergence, and incremental learning to overcome catastrophic forgetting. In this paper, we propose a scalable wide neural network (SWNN), composed of multiple multi-channel wide RBF neural networks (MWRBF). The MWRBF neural network focuses on different regions of data and nonlinear transformations can be performed with Gaussian kernels. The number of MWRBFs for proposed SWNN is decided by the scale and difficulty of learning tasks. The splitting and iterative least squares (SILS) training method is proposed to make the training process easy with large and high dimensional data. Because the least squares method can find pretty good weights during the first iteration, only a few succeeding iterations are needed to fine tune the SWNN. Experiments were performed on different datasets including gray and colored MNIST data, hyperspectral remote sensing data (KSC, Pavia Center, Pavia University, and Salinas), and compared with main stream learning models. The results show that the proposed SWNN is highly competitive with the other models.<br/></div> © 2013 IEEE.

Number of references:53

Main heading:Clustering algorithms

Controlled terms:Iterative methods - Least squares approximations - Remote sensing - Learning systems - Mathematical transformations - Deep learning

Uncontrolled terms:Catastrophic forgetting - High dimensional data - Hyperspectral remote sensing data - Incremental learning - Iterative least squares - Least squares methods - Non-linear transformations - RBF Neural Network

Classification code:461.4 Ergonomics and Human Factors Engineering - 903.1 Information Sources and Analysis - 921.3 Mathematical Transformations - 921.6 Numerical Methods

DOI:10.1109/ACCESS.2021.3068880

Funding details: Number: 41874005,61806022, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 201404910404, Acronym: CSC, Sponsor: China Scholarship Council;Number: SKLGIE 2018-M-3-4, Acronym: SKLGIE, Sponsor: State Key Laboratory of Geo-Information Engineering;Number: 2018YFC1504805, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;Number: 300102260301,300102260404,300102269103,300102269304, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;

Funding text:This work was supported in part by the National Key Research and Development Program of China under Grant 2018YFC1504805; in part by the National Natural Science Foundation of China under Grant 61806022 and Grant 41874005; in part by the State Key Laboratory of Geo-Information Engineering under Grant SKLGIE 2018-M-3-4; in part by the Fundamental Research Funds for the Central Universities under Grant 300102269103, Grant 300102269304, Grant 300102260301, and Grant 300102260404; and in part by the China Scholarship Council (CSC) through Scholarship under Grant 201404910404.

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20211410166776

Title:A motor imagery EEG signal classification algorithm based on recurrence plot convolution neural network

Authors:Meng, XianJia (1); Qiu, Shi (2); Wan, Shaohua (3); Cheng, Keyang (4); Cui, Lei (1)

Author affiliation:(1) School of Information Science and Technology, Northwest University, Xi 'an; 710027, China; (2) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) School of Information and Safety Engineering, Zhongnan University of Economics and Law, Wuhan; 430073, China; (4) School of Computer Science and Communication Engineering, Jiangsu University, Zhenjiang; 212000, China

Corresponding author:Qiu, Shi

Source title:Pattern Recognition Letters

Abbreviated source title:Pattern Recogn. Lett.

Volume:146

Issue date:June 2021

Publication year:2021

Pages:134-141

Language:English

ISSN:01678655

Document type:Journal article (JA)

Publisher:Elsevier B.V.

Abstract:<div data-language="eng" data-ev-field="abstract">With the promotion of brain-computer interface technology, it is possible to study brain control system through EEG signals in recent years. In order to solve the problem of EEG signal classification effectively, a motor imagery classification algorithm based on recurrence plot convolution neural network is proposed. Firstly, EEG signals are preprocessed to enhance the signal intensity in the exercise interval. Secondly, time-domain and frequency-domain features are extracted respectively to construct the feature mode of recurrence plot. Finally, a new neural network is established to realize the accurate recognition of left and right movements. This research can also be transferred to other research fields.<br/></div> © 2021 Elsevier B.V.

Number of references:36

Main heading:Brain computer interface

Controlled terms:Convolution - Image classification - Biomedical signal processing - Computer control systems - Frequency domain analysis

Uncontrolled terms:Brain controls - Classification algorithm - Convolution neural network - EEG signals - EEG signals classification - Interface technology - Motor imagery - Motor imagery classification - Motor imagery EEG - Recurrence plot

Classification code:716.1 Information Theory and Signal Processing - 722.2 Computer Peripheral Equipment - 723.2 Data Processing and Image Processing - 723.5 Computer Applications - 731.1 Control Systems - 921.3 Mathematical Transformations

DOI:10.1016/j.patrec.2021.03.023

Funding details: Number: 61702416, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2020M682144, Acronym: -, Sponsor: China Postdoctoral Science Foundation;

Funding text:This work is supported by Postdoctoral Science Foundation of China (Grant No. 2020M682144 ). National Natural Science Foundation of China (Grant No. 61702416 ).

Database:Compendex

Accession number:20211910320664

Title:Effects of secondary electron emission yield properties on gain and timing performance of ALD-coated MCP

Authors:Guo, Lehui (1, 2, 3); Xin, Liwei (1, 3); Li, Lili (1, 2, 3); Gou, Yongsheng (1); Sai, Xiaofeng (1); Li, Shaohui (1); Liu, Hulin (1); Xu, Xiangyan (1); Liu, Baiyu (1); Gao, Guilong (1); He, Kai (1); Zhang, Mingrui (1); Qu, Youshan (1); Xue, Yanhua (1); Wang, Xing (1); Chen, Ping (1, 3, 4); Tian, Jinshou (1, 3)

Author affiliation:(1) Key Laboratory of Ultra-fast photoelectric Diagnostics Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan; 030006, China; (4) Key Laboratory for Laser Plasmas (Ministry of Education) and School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai; 200240, China

Corresponding author:Chen, Ping(chenping@opt.cn)

Source title:Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

Abbreviated source title:Nucl Instrum Methods Phys Res Sect A

Volume:1005

Issue date:July 21, 2021

Publication year:2021

Article number:165369

Language:English

ISSN:01689002

CODEN:NIMAER

Document type:Journal article (JA)

Publisher:Elsevier B.V.

Abstract:<div data-language="eng" data-ev-field="abstract">The technology of atomic layer deposition has been used to improve the lifetime of the microchannel plate-photomultiplier tube (MCP-PMT) effectively and makes MCP possible to choose to coat different potential emissive materials on the internal surface of the MCP channels in the future. However, it is still an open question to what extent the secondary electron emission (SEE) yield properties of the emissive materials influence the behavior of the ALD-coated MCP. In this work, the dependences of the gain and timing performance on the SEE yield properties were assessed by using the Monte Carlo and particle-in-cell methods. We established the three-dimensional MCP single channel model in Computer Simulation Technology (CST) Particle Studio. Three important secondary electron emissions, the backscattered, rediffused and true SEEs, were discussed numerically based on the probabilistic model. The secondary electron cascade processes in the MCP single channel were simulated. The simulation results indicate that the opportunities for improving the gain of the ALD-coated MCP by improving the SEE yields corresponding to the incident energies of 0 eV–100 eV. The backscattered and rediffused electrons are found to have strong effects on the gain and timing performance of the MCP. Although the higher the SEE yield the higher the MCP gain, the drawback is the extremely high SEE yield will make the MCP saturated prematurely and degrade the time resolution. The simulation results will be used to guide the design and selection of emissive material for ALD-coated MCP development.<br/></div> © 2021 Elsevier B.V.

Number of references:21

Main heading:Atomic layer deposition

Controlled terms:Electrons - Photomultipliers - Microchannels - Timing circuits - Monte Carlo methods - Image storage tubes - Secondary emission

Uncontrolled terms:Electron emission yields - Emissive materials - Gain - Gain performance - Micro channel plate - Microchannel plate - Secondary electron emission yield - Secondary electron emissions - Timing performance - Yield properties

Classification code:713.4 Pulse Circuits - 714.1 Electron Tubes - 813.1 Coating Techniques - 922.2 Mathematical Statistics - 933.1.2 Crystal Growth

Numerical data indexing:Electron volt 0.00E00eV, Electron volt 1.00E+02eV

DOI:10.1016/j.nima.2021.165369

Funding details: Number: 11805267,12075311, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: -, Acronym: MOE, Sponsor: Ministry of Education of the People's Republic of China;Number: GJJSTD20190004,XDA25030900, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: -, Acronym: SJTU, Sponsor: Shanghai Jiao Tong University;

Funding text:This work is supported by National Natural Science Foundation of China (Grant No. 11805267 and 12075311 ), the Scientific Instrument Developing Project of the Chinese Academy of Sciences (Grant No. GJJSTD20190004 ), Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDA25030900 ) and Key Laboratory for Laser Plasmas (Ministry of Education), Shanghai Jiao Tong University, China .

Database:Compendex

Accession number:20220211450474

Title:Optical design of a snapshot image mapping spectrometer

Authors:Ding, Xiaoming (1, 2); Yan, Qiangqiang (2); Hu, Liang (3); Zhou, Shubo (4); Wang, Xiaocheng (1); Li, Yupeng (1)

Author affiliation:(1) Tianjin Key Laboratory of Wireless Mobile Communications and Power Transmission, Tianjin Normal University, Tianjin; 300387, China; (2) CAS Key Laboratory of Spectral Imaging Technology, Xi'an institute of Optics and Precision Mechanics, Xi'an; 710119, China; (3) Key Laboratory of Computational Optics Imaging Technology, Aerospace-Information Research Institution, Chinese Academy of Sciences, Beijing; 100094, China; (4) Institute of Information Science and Technology, Donghua University, Shanghai; 201620, China

Corresponding author:Ding, Xiaoming(xmding@tjnu.edu.cn)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12064

Part number:1 of 1

Issue title:AOPC 2021: Optical Spectroscopy and Imaging

Issue date:2021

Publication year:2021

Article number:120640D

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510650039

Document type:Conference article (CA)

Conference name:2021 Applied Optics and Photonics China: Optical Spectroscopy and Imaging, AOPC 2021

Conference date:June 20, 2021 - June 22, 2021

Conference location:Beijing, China

Conference code:175875

Sponsor:Chinese Society for Optical Engineering

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">This paper introduces the optical design method of an IMS prototype and proposes an entire optical system optimization approach. The final performance evaluation reveals that the optimized system could meet the requirements. The spectral range of the prototype is designed to be from 450 nm to 700 nm, containing 31 bands. The spectral resolution at the central wavelength is about 8 nm. The field angle (2ω) is 1.86 deg, and the spatial angle resolution (Δω) is designed to be 0.013 deg.<br/></div> Copyright © 2021 SPIE.

Number of references:3

Main heading:Optical design

Controlled terms:Optical systems - Photomapping - Spectroscopy

Uncontrolled terms:Design method - Image mapper - Image mapping - Optical system optimization - Optimization approach - Optimized system - Performances evaluation - Snapshot images - Snapshot spectral imaging - Spectral range

Classification code:405.3 Surveying - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 742.1 Photography

Numerical data indexing:Size 4.50E-07m to 7.00E-07m, Size 8.00E-09m

DOI:10.1117/12.2606321

Funding details: Number: LSIT202004W, Acronym: -, Sponsor: -;Number: 52XB2004,52XB2005, Acronym: -, Sponsor: -;Number: 61803372,61901301,62001327,62001328, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2021JQ-323, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;

Funding text:Fig. 10 Spot diagram and MTF of sub pupil #1 and #3 4. CONCLUSION In this paper, we made an optical optimization for a prototype of the image mapping spectrometer. Each of the components are first optimized respectively, then we combined them together to form the integral system to obtain the best performance. Spot diagram, MTF, ray fan and geometric encircled energy are utilized to evaluate the optimized system, and the results reveal that the entire imaging system realized a good performance. Acknowledgments This work was supported by the National Science Foundation of China (NSFC) (62001328, 61803372, 62001327, 61901301), Doctoral Foundation of Tianjin Normal University (52XB2004, 52XB2005), Natural Science Foundation of Shaanxi Province (2021JQ-323) and Open Fund of CAS Key Laboratory of Spectral Imaging Technology (No. LSIT202004W). References [1] Gao, L.and Wang, L. V., "A review of snapshot multidimensional optical imaging: Measuring photon tags in parallel," Physics Reports, 616, 1–37 (2016). [2] Pawlowski, M. E., Dwight, J. G., Nguyen, T., and Tkaczyk, T. S., "High performance image mapping spectrometer (IMS) for snapshot hyperspectral imaging applications," Optics Express, 27(2), 1597. (2019). [3] Liu, A., Su, L., Yuan, Y., & Ding, X., "Accurate ray tracing model of an imaging system based on image mapper," Optics Express, 28(2), 2251. (2020).

Database:Compendex

Accession number:20214711207854

Title:Real-time study of coexisting states in laser cavity solitons

Authors:Hanzard, Pierre Henry (1); Rowley, Maxwell (1); Cutrona, Antonio (1); Chu, Sai T. (2); Little, Brent E. (3); Morandotti, Roberto (4, 5); Moss, David J. (6); Wetzel, Benjamin (7); Gongora, Juan Sebastian Totero (1); Peccianti, Marco (1); Pasquazi, Alessia (1)

Author affiliation:(1) Emergent Photonics (Epic) Lab, Dept. of Physics and Astronomy, University of Sussex, BN1 9QH, United Kingdom; (2) Department of Physics, City University of Hong Kong, Tat Chee Avenue, Hong Kong; (3) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, CAS, Xi'an, China; (4) INRS-EMT, 1650 Boulevard Lionel-Boulet, Varennes; QC; J3X 1S2, Canada; (5) Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology, Chengdu, China; (6) Optical Sciences Centre, Swinburne University of Technology, Hawthorn; VIC; 3122, Australia; (7) Xlim Research Institute, CNRS, UMR 7252, Université de Limoges, Limoges; 87060, France

Corresponding author:Hanzard, Pierre Henry(p.b.hanzard@sussex.ac.uk)

Source title:Optics InfoBase Conference Papers

Abbreviated source title:Opt. InfoBase Conf. Pap

Part number:1 of 1

Issue title:CLEO: QELS_Fundamental Science, CLEO: QELS 2021

Issue date:2021

Publication year:2021

Article number:FM4H.7

Language:English

ISBN-13:9781557528209

Document type:Conference article (CA)

Conference name:CLEO: QELS_Fundamental Science, CLEO: QELS 2021 - Part of Conference on Lasers and Electro-Optics, CLEO 2021

Conference date:May 9, 2021 - May 14, 2021

Conference location:Virtual, Online, United states

Conference code:174076

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">We experimentally demonstrate the presence of two coexisting states in Laser Cavity Solitons (LCS) Microcombs. By using the Dispersive Fourier Transform technique, we show the simultaneous presence of both LCS and a background modulation.<br/></div> © OSA 2021, © 2021 The Author(s)

Number of references:5

Uncontrolled terms:Cavity solitons - Co-existing state - Dispersive Fourier transforms - Microcombs - Real-time studies

Classification code:744.7 Laser Components

Database:Compendex

Accession number:20214811244479

Title:Real-time study of coexisting states in laser cavity solitons

Authors:Hanzard, Pierre-Henry (1); Rowley, Maxwell (1); Cutrona, Antonio (1); Chu, Sai T. (2); Little, Brent E. (3); Morandotti, Roberto (4, 5); Moss, David J. (6); Wetzel, Benjamin (7); Gongora, Juan Sebastian Totero (1); Peccianti, Marco (1); Pasquazi, Alessia (1)

Author affiliation:(1) Emergent Photonics (Epic) Lab, Dept. of Physics and Astronomy, University of Sussex, BN1 9QH, United Kingdom; (2) Department of Physics, City University of Hong Kong, Tat Chee Avenue, Hong Kong; (3) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, CAS, Xi'an, China; (4) INRS-EMT, 1650 Boulevard Lionel-Boulet, Varennes; QC; J3X 1S2, Canada; (5) Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology, Chengdu, China; (6) Optical Sciences Centre, Swinburne University of Technology, Hawthorn; VIC; 3122, Australia; (7) Xlim Research Institute, CNRS, UMR 7252, Université de Limoges, Limoges; 87060, France

Corresponding author:Hanzard, Pierre-Henry(p.b.hanzard@sussex.ac.uk)

Source title:Optics InfoBase Conference Papers

Abbreviated source title:Opt. InfoBase Conf. Pap

Part number:1 of 1

Issue title:European Quantum Electronics Conference, EQEC 2021

Issue date:2021

Publication year:2021

Language:English

ISBN-13:9781557528209

Document type:Conference article (CA)

Conference name:2021 European Quantum Electronics Conference, EQEC 2021 - Part of 2021 Conference on Lasers and Electro-Optics Europe, CLEO 2021

Conference date:June 21, 2021 - June 25, 2021

Conference location:Virtual, Online, Germany

Conference code:174130

Publisher:The Optical Society

Number of references:5

Funding details: Number: 265240,266044, Acronym: FP7, Sponsor: Seventh Framework Programme;Number: G1001164, Acronym: MRC, Sponsor: Medical Research Council;

Database:Compendex

Accession number:20214311055293

Title:Autonomous on-chip interferometry for reconfigurable optical waveform generation (Open Access)

Authors:Fischer, Bennet (1); Chemnitz, Mario (1); MacLellan, Benjamin (1); Roztocki, Piotr (1); Helsten, Robin (1); Wetzel, Benjamin (2); Little, Brent E. (3); Chu, Sai T. (4); Moss, David J. (5); Azana, Jose (1); Morandotti, Roberto (1, 6)

Author affiliation:(1) Institut National de la Recherche Scientifique, Centre Énergie Matériaux Télécommunications, 1650 Boulevard Lionel-Boulet, Varennes; QC; J3X 1S2, Canada; (2) XLIM Research Institute, CNRSUMR7252, Université de Limoges, Limoges; 87060, France; (3) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Science, Shaanxi, Xi'an, China; (4) Department of Physics, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong; (5) Optical Sciences Centre, Swinburne University of Technology, Hawthorn; VIC; 3122, Australia; (6) Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Sichuan, Chengdu; 610054, China

Corresponding author:Chemnitz, Mario(mario.chemnitz@inrs.ca)

Source title:Optica

Abbreviated source title:Optica

Volume:8

Issue:10

Issue date:October 2021

Publication year:2021

Pages:1268-1276

Language:English

ISSN:23342536

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">The generation of user-defined optical temporal waveforms with picosecond resolution is an essential task for many applications, ranging fromtelecommunications to laser engineering.Realizing this functionality in an on-chip reconfigurable platformremains a significant challenge. Towards this goal, autonomous optimization methods are fundamental to counter fabrication imperfections and environmental variations, as well as to enable a wider range of accessible waveform shapes and durations. In this work, we introduce and demonstrate a self-adjusting on-chip optical pulse-shaper based on the concept of temporal coherence synthesis. The scheme enables on-the-fly reconfigurability of output optical waveforms by using an all-optical sampling technique in combination with an evolutionary optimization algorithm. We further show that particle-swarmoptimization can outperformmore commonly used algorithms in terms of convergence time.Hence, our system combines all key ingredients for realizing fully on-chip smart optical waveformgenerators for next-generation applications in telecommunications, laser engineering, and nonlinear optics.<br/></div> © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.

Number of references:46

Main heading:Nonlinear optics

Controlled terms:Pulse shaping - Evolutionary algorithms - Optimization

Uncontrolled terms:Environmental variations - Fabrication imperfections - On chips - Optical waveform - Optical- - Optimization method - Picosecond resolution - Reconfigurable - Temporal waveforms - Waveform generation

Classification code:713.4 Pulse Circuits - 741.1.1 Nonlinear Optics - 921.5 Optimization Techniques

DOI:10.1364/OPTICA.435435

Funding details: Number: -, Acronym: H2020, Sponsor: Horizon 2020 Framework Programme;Number: 950618, Acronym: ERC, Sponsor: H2020 European Research Council;Number: -, Acronym: NSERC, Sponsor: Natural Sciences and Engineering Research Council of Canada;Number: -, Acronym: ERC, Sponsor: European Research Council;Number: ANR-20-CE30-0004, Acronym: ANR, Sponsor: Agence Nationale de la Recherche;Number: -, Acronym: -, Sponsor: Canada Research Chairs;Number: GRF 11213618, Acronym: UGC, Sponsor: University Grants Committee;Number: XDB24030300, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: -, Acronym: 研究資助局, Sponsor: Research Grants Council, University Grants Committee;Number: -, Acronym: FRQNT, Sponsor: Fonds de recherche du Québec – Nature et technologies;

Funding text:Funding. Strategic Priority Research Program of the Chinese Academy of Sciences (XDB24030300); Research Grants Council, University Grants Committee (GRF 11213618); Canada Research Chairs; Natural Sciences and Engineering Research Council of Canada (Alliance, Banting Program, CGS-M, Vanier Program); Conseil Régional de Nouvelle-Aquitaine (SCIR project, SPINAL project); Agence Nationale de la Recherche (Optimal project, ANR-20-CE30-0004); H2020 European Research Council (950618); Fonds de recherche du Québec—Nature et technologies (PBEEE).Strategic Priority Research Program of the Chinese Academy of Sciences (XDB24030300); Research Grants Council, University Grants Committee (GRF 11213618); Canada Research Chairs; Natural Sciences and Engineering Research Council of Canada (Alliance, Banting Program, CGSM, Vanier Program); Conseil Régional de Nouvelle-Aquitaine (SCIR project, SPINAL project); Agence Nationale de la Recherche (Optimal project, ANR-20- CE30-0004); H2020 European Research Council (950618); Fonds de recherche duQuébec-Nature et technologies (PBEEE).Acknowledgment. B. W. acknowledges funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program under grant agreement No. 950618. R. M. is affiliated with Affiliation 6 as an adjoint professor.

Database:Compendex

Open Access type(s): All Open Access, Gold, Green

Accession number:20212110381761

Title:A framework of modelling slip-controlled crack growth in polycrystals using crystal plasticity and XFEM (Open Access)

Authors:Zhang, P. (1, 2); Lu, S. (1); Baxevanakis, K.P. (2); Zhao, L.G. (2, 3, 4); Yu, T.Y. (5); Zhou, R.X. (6)

Author affiliation:(1) School of Power and Energy, Northwestern Polytechnical University, Xi'an; 710129, China; (2) Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, LE11 3TU, United Kingdom; (3) College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing; , 210016, China; (4) School of Mechanical and Equipment Engineering, Hebei University of Engineering, Handan; 056038, China; (5) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (6) School of Civil Engineering, Hefei University of Technology, Hefei; 23009, China

Corresponding author:Lu, S.(shanlu@nwpu.edu.cn)

Source title:Journal of Physics: Conference Series

Abbreviated source title:J. Phys. Conf. Ser.

Volume:1885

Part number:4 of 5

Issue:4

Issue title:2021 7th International Conference on Manufacturing Technology and Applied Materials, ICAMMT 2021 - 3. Intelligent Mechanical Technology and Automated Manufacturing Process

Issue date:April 28, 2021

Publication year:2021

Article number:042014

Language:English

ISSN:17426588

E-ISSN:17426596

Document type:Conference article (CA)

Conference name:2021 7th International Conference on Manufacturing Technology and Applied Materials, ICAMMT 2021

Conference date:March 26, 2021 - March 28, 2021

Conference location:Sanya, China

Conference code:168830

Publisher:IOP Publishing Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">Short cracks tend to develop at high and irregular rates compared to macroscopic cracks, making the prediction of fatigue life a challenging task. In this work, a numerical framework combining crystal plasticity model and the Extended Finite Element Method (XFEM) is applied to study the slip-controlled short crack growth in a polycrystal superalloy RR1000. The model is calibrated from experiments and used to evaluate short crack growth paths and rates. Two fracture criteria are used and compared: The onset of fracture is controlled by the total and individual cumulative shear strain respectively, and the crack grows either perpendicular to the direction of maximum principal strain or along crystallographic directions.<br/></div> © Published under licence by IOP Publishing Ltd.

Number of references:6

Main heading:Shear strain

Controlled terms:Finite element method - Fracture - Polycrystals - Fatigue of materials - Cracks - Plasticity - Numerical methods

Uncontrolled terms:Crystal plasticity - Crystal plasticity models - Crystallographic directions - Extended finite element method - Macroscopic cracks - Maximum principal strain - Polycrystal superalloys - Prediction of fatigue lives

Classification code:921.6 Numerical Methods - 931.1 Mechanics - 933.1 Crystalline Solids - 951 Materials Science

DOI:10.1088/1742-6596/1885/4/042014

Funding details: Number: EP/K026844/1,EP/M000966/1, Acronym: EPSRC, Sponsor: Engineering and Physical Sciences Research Council;Number: 201806290092, Acronym: CSC, Sponsor: China Scholarship Council;

Funding text:P. Zhang would like to acknowledge the support from the China Scholarship Council (CSC, No. 201806290092). The work was also funded by the EPSRC (Grant EP/M000966/1 and EP/K026844/1) of the UK.

Database:Compendex

Open Access type(s): All Open Access, Bronze, Green

Accession number:20204709509999

Title:The ensemble deep learning model for novel COVID-19 on CT images (Open Access)

Authors:Zhou, Tao (1, 3); Lu, Huiling (2); Yang, Zaoli (4); Qiu, Shi (5); Huo, Bingqiang (1); Dong, Yali (1)

Author affiliation:(1) School of Computer Science and Engineering, North minzu University, Yinchuan; 750021, China; (2) School of Science, Ningxia Medical University, Yinchuan; 750004, China; (3) Ningxia Key Laboratory of Intelligent Information and Big Data Processing, Yinchuan; 750021, China; (4) College of Economics and Management, Beijing University of Technology, Beijing; 100124, China; (5) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China

Corresponding author:Lu, Huiling

Source title:Applied Soft Computing

Abbreviated source title:Appl. Soft Comput.

Volume:98

Issue date:January 2021

Publication year:2021

Article number:106885

Language:English

ISSN:15684946

Document type:Journal article (JA)

Publisher:Elsevier Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">The rapid detection of the novel coronavirus disease, COVID-19, has a positive effect on preventing propagation and enhancing therapeutic outcomes. This article focuses on the rapid detection of COVID-19. We propose an ensemble deep learning model for novel COVID-19 detection from CT images. 2933 lung CT images from COVID-19 patients were obtained from previous publications, authoritative media reports, and public databases. The images were preprocessed to obtain 2500 high-quality images. 2500 CT images of lung tumor and 2500 from normal lung were obtained from a hospital. Transfer learning was used to initialize model parameters and pretrain three deep convolutional neural network models: AlexNet, GoogleNet, and ResNet. These models were used for feature extraction on all images. Softmax was used as the classification algorithm of the fully connected layer. The ensemble classifier EDL-COVID was obtained via relative majority voting. Finally, the ensemble classifier was compared with three component classifiers to evaluate accuracy, sensitivity, specificity, F value, and Matthews correlation coefficient. The results showed that the overall classification performance of the ensemble model was better than that of the component classifier. The evaluation indexes were also higher. This algorithm can better meet the rapid detection requirements of the novel coronavirus disease COVID-19.<br/></div> © 2020 Elsevier B.V.

Number of references:34

Main heading:COVID-19

Controlled terms:Transfer learning - Backpropagation - Computerized tomography - Coronavirus - Deep neural networks - Biological organs - Learning systems - Convolutional neural networks

Uncontrolled terms:Classification algorithm - Classification performance - Component classifiers - Correlation coefficient - Ensemble classifiers - Ensemble modeling - High quality images - Therapeutic outcomes

Classification code:461.2 Biological Materials and Tissue Engineering - 461.4 Ergonomics and Human Factors Engineering - 461.6 Medicine and Pharmacology - 461.7 Health Care - 723.4 Artificial Intelligence - 723.5 Computer Applications

DOI:10.1016/j.asoc.2020.106885

Funding details: Number: 62062003, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2020KYQD08, Acronym: MNU, Sponsor: North Minzu University;

Funding text:This work is supported by Natural Science Foundation of China (Grant No. 62062003 ), North Minzu University Research Project of Talent Introduction, China (No. 2020KYQD08 ).

Database:Compendex

Open Access type(s): All Open Access, Bronze, Green

Accession number:20214111001467

Title:Spectral Discrimination of Rabbit Liver VX2 Tumor and Normal Tissue Based on Genetic Algorithm-Support Vector Machine

Title of translation:基于遗传算法-支持向量机的兔肝VX2肿瘤光谱鉴别

Authors:Liu, Chen-Yang (1, 2); Xu, Huang-Rong (2, 3); Duan, Feng (4); Wang, Tai-Sheng (1); Lu, Zhen-Wu (1); Yu, Wei-Xing (3)

Author affiliation:(1) State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics & Physics, Chinese Academy of Sciences, Changchun; 130033, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Key Laboratory of Spectral Imaging Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Science, Xi'an; 710119, China; (4) Department of Interventional Radiology, the General Hospital of Chinese People's Liberation Army, Beijing; 100853, China

Corresponding author:Yu, Wei-Xing(yuwx@opt.ac.cn)

Source title:Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis

Abbreviated source title:Guang Pu Xue Yu Guang Pu Fen Xi

Volume:41

Issue:10

Issue date:October 2021

Publication year:2021

Pages:3123-3128

Language:Chinese

ISSN:10000593

CODEN:GYGFED

Document type:Journal article (JA)

Publisher:Science Press

Abstract:<div data-language="eng" data-ev-field="abstract">Rabbit liver VX2 tumor is a tumor model that can grow rapidly in various organs, such as liver, lung, rectum, etc., and is often used in tumor research. In this paper, using high-near-infrared spectrum technology to four rabbits VX2 liver tumor and normal tissue in vivo and in vitro reflection spectrum detection, then respectively the Two categories based on support vector machine (normal liver tissue and liver VX2 tumor tissue) and Four categories (not bleeding living normal liver tissue, not living liver VX2 tumor tissue bleeding, bleeding in vitro normal liver tissue and hemorrhage in vitro liver VX2 tumor tissue). According to its spectral reflection curve characteristics, the data in the range of 400~1 800 nm are selected as characteristic variables. In order to further improve the classification accuracy, the kernel parameter g and penalty factor c of the support vector machine was optimized by using a 50 fold cross-validation and genetic algorithm, respectively. The optimization parameters and classification results of the 50-fold cross-validation are as follows: penalty parameter c of the dichotomy optimization is 4, kernel parameter g is 0.125 0, and the accuracy of the correction set and prediction set reaches 100%. The optimized parameters c and g are 8 and 0.121 1, and the accuracy of the correction set and the prediction set are 99.242 4% and 93.33 3%, respectively. The optimized parameters and results of the genetic algorithm are as follows: the optimized parameters c and g in dichotomy are 0.845 6 and 0.062 5, respectively, and the accuracy of Two categories, the correction set and the prediction set, is agreed to reach 100%.The optimized parameter C in the Four categories was 5.530 7 and g was 0.068 5, and the accuracy of the correction set and the prediction set reached 99.242 4% and 100%, respectively. The results show that the two optimization methods have achieved good results, and the genetic algorithm is more accurate in the classification of the Four categories. In order to further improve the speed of the algorithm, the method of variable selection at intervals was adopted to reduce the characteristic variables continuously. Finally, a variable was selected for every 100 nm spectral segment, and a total of 14 spectral segments were selected as the characteristic variables. Parameters of support vector machine were optimized by using genetic algorithm for the classification was studied, the results show that the Two categories and Four categories of both results of the calibration set and prediction set were 99.242 4%, and the running time of 11.4 s and 20.0 s respectively, and choosing all band running time: 340.3 s and 491.0 s compared to how spectroscopy can be in the identification of hepatic VX2 tumor tissue and normal liver tissue. The classification accuracy rate can reach more than 99%, and the running time shorten a lot. Therefore, it also lays a foundation for realising rapid real-time online detection and classification of tumor tissues in the future clinical tumor diagnosis with multi-spectrum technology, showing great application potential.<br/></div> © 2021, Peking University Press. All right reserved.

Number of references:15

Main heading:Support vector machines

Controlled terms:Parameter estimation - Infrared devices - Vectors - Forecasting - Near infrared spectroscopy - Genetic algorithms - Tumors

Uncontrolled terms:Liver tissue - Optimized parameter - Parameter C - Rabbit liver VX2 tumor - Support vectors machine - The visible-near-infrared vis-NIR spectroscopy - Tumour tissue - Vis/NIR spectroscopy - Visible near-infrared - VX2 tumor

Classification code:461.2 Biological Materials and Tissue Engineering - 723 Computer Software, Data Handling and Applications - 921.1 Algebra

Numerical data indexing:Percentage 1.00E+02%, Percentage 3.00E+00%, Percentage 4.00E+00%, Percentage 9.90E+01%, Size 1.00E-07m, Size 8.00E-07m, Time 1.14E+01s, Time 2.00E+01s, Time 3.403E+02s, Time 4.91E+02s

DOI:10.3964/j.issn.1000-0593(2021)10-3123-06

Database:Compendex

Accession number:20211810301185

Title:Arbitrary Phase Access for Stable Fiber Interferometers (Open Access)

Authors:Roztocki, Piotr (1, 2); MacLellan, Benjamin (1); Islam, Mehedi (1); Reimer, Christian (1, 3); Fischer, Bennet (1); Sciara, Stefania (1, 4); Helsten, Robin (1); Jestin, Yoann (1, 2); Cino, Alfonso (4); Chu, Sai T. (5); Little, Brent (6); Moss, David J. (7); Kues, Michael (1, 8); Morandotti, Roberto (1, 9)

Author affiliation:(1) Institut National de la Recherche Scientifique (INRS-EMT), Varennes; QC, Canada; (2) Ki3 Photonics Technologies, Montreal; QC, Canada; (3) HyperLight Corporation, Cambridge; MA, United States; (4) Department of Engineering, University of Palermo, Palermo, Italy; (5) Department of Physics and Material Science, City University of Hong Kong, Hong Kong; (6) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Science, Xi'an, China; (7) Optical Sciences Centre, Swinburne University of Technology, Hawthorn; VIC, Australia; (8) Institute of Photonics, Leibniz University of Hannover, Hannover, Germany; (9) Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, China

Corresponding authors:Kues, Michael(michael.kues@iop.uni-hannover.de); Morandotti, Roberto(morandotti@emt.inrs.ca)

Source title:Laser and Photonics Reviews

Abbreviated source title:Laser Photon. Rev.

Volume:15

Issue:7

Issue date:July 2021

Publication year:2021

Article number:2000524

Language:English

ISSN:18638880

E-ISSN:18638899

Document type:Journal article (JA)

Publisher:John Wiley and Sons Inc

Abstract:<div data-language="eng" data-ev-field="abstract">Well-controlled yet practical systems that give access to interference effects are critical for established and new functionalities in ultrafast signal processing, quantum photonics, optical coherence characterization, etc. Optical fiber systems constitute a central platform for such technologies. However, harnessing optical interference in a versatile and stable manner remains technologically costly and challenging. Here, degrees of freedom native to optical fibers, i.e., polarization and frequency, are used to demonstrate an easily deployable technique for the retrieval and stabilization of the relative phase in fiber interferometric systems. The scheme gives access (without intricate device isolation) to <1.3 × 10<sup>−3</sup> π rad error signal Allan deviation across 1 ms to 1.2 h integration times for all tested phases, ranging from 0 to 2π. More importantly, the phase-independence of this stability is shown across the full 2π range, granting access to arbitrary phase settings, central for, e.g., performing quantum projection measurements and coherent pulse recombination. Furthermore, the scheme is characterized with attenuated optical reference signals and single-photon detectors, and extended functionality is demonstrated through the use of pulsed reference signals (allowing time-multiplexing of both main and reference signals). Finally, the scheme is used to demonstrate radiofrequency-controlled interference of high-dimensional time-bin entangled states.<br/></div> © 2021 The Authors. Laser & Photonics Reviews published by Wiley-VCH GmbH

Number of references:54

Main heading:Interferometers

Controlled terms:Quantum entanglement - Photonics - Degrees of freedom (mechanics) - Signal processing - Photons - Particle beams

Uncontrolled terms:Fiber interferometers - Interference effects - Interferometric system - Optical fiber systems - Optical reference signals - Reference signals - Single-photon detectors - Ultrafast signal processing

Classification code:716.1 Information Theory and Signal Processing - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 931.1 Mechanics - 931.3 Atomic and Molecular Physics - 931.4 Quantum Theory; Quantum Mechanics - 932.1 High Energy Physics - 941.3 Optical Instruments

Numerical data indexing:Time 1.00e-03s to 4.32e+03s

DOI:10.1002/lpor.202000524

Funding details: Number: 9610356, Acronym: -, Sponsor: -;Number: 656607, Acronym: MSCA, Sponsor: H2020 Marie Sk&lstrok;odowska-Curie Actions;Number: -, Acronym: MESI, Sponsor: Ministère de l'Économie, de la Science et de l'Innovation - Québec;Number: -, Acronym: NSERC, Sponsor: Natural Sciences and Engineering Research Council of Canada;Number: DP150104327, Acronym: ARC, Sponsor: Australian Research Council;Number: -, Acronym: -, Sponsor: Canada Research Chairs;Number: XDB24030300, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: -, Acronym: -, Sponsor: Horizon 2020;

Funding text:P.R. and B.M. contributed equally to this work. This work was supported by the Natural Sciences and Engineering Research Council of Canada (NSERC) through the Steacie, Synergy, Strategic, Discovery and Acceleration Grants Schemes, by the MESI PSR-SIIRI Initiative in Quebec, by the Canada Research Chair Program, and by the Australian Research Council Discovery Projects scheme (DP150104327). P.R. and C.R. acknowledge the support of NSERC Vanier Canada Graduate Scholarships. B.M. acknowledges support provided by an NSERC CGS-M fellowship. M.K. acknowledges funding from the European Union's Horizon 2020 Research and Innovation programme under the Marie Sklodowska-Curie grant agreement number 656607. S.T.C. acknowledges support from the CityU APRC programme number 9610356. B.L. acknowledges support from the Strategic Priority Research Program of the Chinese Academy of Sciences (grant number XDB24030300). R.M. is affiliated to the Institute of Fundamental and Frontier Sciences as an adjoint professor. The authors thank J. Azaña for providing some of the required equipment and S. MacLean as well as H. Eisenberg for useful discussions. Special thanks go to Quantum Opus and N. Bertone of OptoElectronic Components for their continuous support and for providing state-of-the-art photon detection equipment. Open access funding enabled and organized by Projekt DEAL.P.R. and B.M. contributed equally to this work. This work was supported by the Natural Sciences and Engineering Research Council of Canada (NSERC) through the Steacie, Synergy, Strategic, Discovery and Acceleration Grants Schemes, by the MESI PSR‐SIIRI Initiative in Quebec, by the Canada Research Chair Program, and by the Australian Research Council Discovery Projects scheme (DP150104327). P.R. and C.R. acknowledge the support of NSERC Vanier Canada Graduate Scholarships. B.M. acknowledges support provided by an NSERC CGS‐M fellowship. M.K. acknowledges funding from the European Union's Horizon 2020 Research and Innovation programme under the Marie Sklodowska‐Curie grant agreement number 656607. S.T.C. acknowledges support from the CityU APRC programme number 9610356. B.L. acknowledges support from the Strategic Priority Research Program of the Chinese Academy of Sciences (grant number XDB24030300). R.M. is affiliated to the Institute of Fundamental and Frontier Sciences as an adjoint professor. The authors thank J. Azaña for providing some of the required equipment and S. MacLean as well as H. Eisenberg for useful discussions. Special thanks go to Quantum Opus and N. Bertone of OptoElectronic Components for their continuous support and for providing state‐of‐the‐art photon detection equipment.

Database:Compendex

Open Access type(s): All Open Access, Green

Accession number:20214311064029

Title:Real-Time Study of Coexisting States in Laser Cavity Solitons (Open Access)

Author affiliation:(1) University of Sussex, Emergent Photonics (Epic) Lab, Dept. of Physics and Astronomy, BN1 9QH, United Kingdom; (2) Department of Physics, City University of Hong Kong, Tat Chee Avenue, Hong Kong, Hong Kong; (3) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Cas, Xi'an, China; (4) INRS-EMT, 1650 Boulevard Lionel-Boulet, Varennes; QC; J3X 1S2, Canada; (5) Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology, Chengdu, China; (6) Optical Sciences Centre, Swinburne University of Technology, Hawthorn; VIC; 3122, Australia; (7) Xlim Research Institute, Cnrs Umr 7252, Université de Limoges, Limoges; 87060, France

Source title:2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2021

Abbreviated source title:Conf. Lasers Electro-Opt. Europe Eur. Quantum Electron. Conf., CLEO/Europe-EQEC

Part number:1 of 1

Issue title:2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2021

Issue date:June 2021

Publication year:2021

Language:English

ISBN-13:9781665418768

Document type:Conference article (CA)

Conference name:2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2021

Conference date:June 21, 2021 - June 25, 2021

Conference location:Munich, Germany

Conference code:172135

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">Laser cavity-solitons microcombs have been recently introduced by our team at the University of Sussex [1]. To gain insight into their dynamics, they need to be studied with an extremely high temporal resolution, as they are ultrashort pulses of hundreds of femtoseconds and at the same time, on a long temporal span, to observe their formation dynamics and subsequent interactions. These challenging temporal features require the development of ad-hoc metrological tools such as Dispersive Fourier Transform, which has opened the research field of so-called 'non-repetitive' events [2]. In nonlinear optics, this includes the study of optical rogue waves [3] and solitons collision-induced explosion in mode-locked lasers [4].<br/></div> © 2021 IEEE.

Number of references:5

Main heading:Solitons

Uncontrolled terms:Cavity solitons - Co-existing state - Femtoseconds - Formation dynamics - Gain insight - High temporal resolution - Microcombs - Real-time studies - Ultrashort-pulse - University of Sussex

Classification code:741.1.1 Nonlinear Optics

DOI:10.1109/CLEO/Europe-EQEC52157.2021.9541692

Database:Compendex

Open Access type(s): All Open Access, Green

Accession number:20210405463

Title:Energy-Efficient Design for a NOMA assisted STAR-RIS Network with Deep Reinforcement Learning

Authors:Guo, Yi (1); Fang, Fang (2); Cai, Donghong (3); Ding, Zhiguo (4)

Author affiliation:(1) Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi'an; 710119, China; (2) Department of Engineering, Durham University, Durham; DH1 3LE, United Kingdom; (3) College of Cyber Security, Jinan University, Guangzhou; 510632, China; (4) School of Electrical and Electronic Engineering, The University of Manchester, Manchester; M13 9PL, United Kingdom

Source title:arXiv

Abbreviated source title:arXiv

Issue date:November 30, 2021

Publication year:2021

Language:English

E-ISSN:23318422

Document type:Preprint (PP)

Publisher:arXiv

Abstract:<div data-language="eng" data-ev-field="abstract">Simultaneous transmitting and reflecting reconfigurable intelligent surfaces (STAR-RISs) has been considered as a promising auxiliary device to enhance the performance of the wireless network, where users located at the different sides of the surfaces can be simultaneously served by the transmitting and reflecting signals. In this paper, the energy efficiency (EE) maximization problem for a non-orthogonal multiple access (NOMA) assisted STAR-RIS downlink network is investigated. Due to the fractional form of the EE, it is challenging to solve the EE maximization problem by the traditional convex optimization solutions. In this work, a deep deterministic policy gradient (DDPG)-based algorithm is proposed to maximize the EE by jointly optimizing the transmission beamforming vectors at the base station and the coefficients matrices at the STAR-RIS. Simulation results demonstrate that the proposed algorithm can effectively maximize the system EE considering the time-varying channels.<br/></div> Copyright © 2021, The Authors. All rights reserved.

Number of references:13

Main heading:Energy efficiency

Controlled terms:Convex optimization - Deep learning - Reinforcement learning - Stars

Uncontrolled terms:Deep deterministic policy gradient - Deterministics - Efficiency maximization - Maximization problem - Multiple access - Non-orthogonal - Non-orthogonal multiple access-MISO - Policy gradient - Reconfigurable - STARRIS

Classification code:461.4 Ergonomics and Human Factors Engineering - 525.2 Energy Conservation - 657.2 Extraterrestrial Physics and Stellar Phenomena - 723.4 Artificial Intelligence

Database:Compendex

Preprint source website:https://arxiv.org

Preprint ID type:ARXIV

Accession number:20220211441070

Title:Background purification framework with extended morphological attribute profile for hyperspectral anomaly detection (Open Access)

Authors:Huang, Ju (1, 2); Liu, Kang (1, 2); Xu, Mingliang (3); Perc, Matjaž (4); Li, Xuelong (5, 6)

Author affiliation:(1) The Shaanxi Key Laboratory of Ocean Optics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) The School of Information Engineering, Zhengzhou University, Zhengzhou; 450001, China; (4) Faculty of Natural Sciences and Mathematics, University of Maribor, Maribor; 2000, Slovenia; (5) The School of Artificial Intelligence, Optics and Electronics, Northwestern Polytechnical University, Xi'an; 710072, China; (6) The Key Laboratory of Intelligent Interaction and Applications, Northwestern Polytechnical University, Ministry of Industry and Information Technology, Xi'an; 710072, China

Corresponding author:Li, Xuelong(li@nwpu.edu.cn)

Source title:IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing

Abbreviated source title:IEEE J. Sel. Top. Appl. Earth Obs. Remote Sens.

Volume:14

Issue date:2021

Publication year:2021

Pages:8113-8124

Language:English

ISSN:19391404

E-ISSN:21511535

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">Hyperspectral anomaly detection has attracted extensive interests for its wide use in military and civilian fields, and three main categories of detection methods have been developed successively over past few decades, including statistical model-based, representation-based, and deep-learning-based methods. Most of these algorithms are essentially trying to construct proper background profiles, which describe the characteristics of background and then identify the pixels that do not conform to the profiles as anomalies. Apparently, the crucial issue is how to build an accurate background profile; however, the background profiles constructed by existing methods are not accurate enough. In this article, a novel and universal background purification framework with extended morphological attribute profiles is proposed. It explores the spatial characteristic of image and removes suspect anomaly pixels from the image to obtain a purified background. Moreover, three detectors with this framework covering different categories are also developed. The experiments implemented on four real hyperspectral images demonstrate that the background purification framework is effective, universal, and suitable. Furthermore, compared with other popular algorithms, the detectors with the framework perform well in terms of accuracy and efficiency.<br/></div> © This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see https://creativecommons.org/licenses/by/4.0/

Number of references:45

Main heading:Pixels

Controlled terms:Spectroscopy - Deep learning - Purification - Anomaly detection

Uncontrolled terms:Anomaly detection - Auto encoders - Background purification - Extended attribute profile - Extended attribute profiles - Hyperspectral anomaly detection - Hyperspectral image - Sparse representation - Stacked autoencoder

Classification code:461.4 Ergonomics and Human Factors Engineering

DOI:10.1109/JSTARS.2021.3103858

Funding details: Number: 61871470, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: QYZDY-SSW-JSC044, Acronym: CAS, Sponsor: Chinese Academy of Sciences;

Funding text:Manuscript received May 11, 2021; revised July 22, 2021; accepted August 1, 2021. Date of publication August 10, 2021; date of current version August 27, 2021. This work was supported in part by the Key Research Program of Frontier Sciences, Chinese Academy of Sciences under Grant QYZDY-SSW-JSC044 and in part by the National Natural Science Foundation of China under Grant 61871470. (Corresponding author: Xuelong Li.) Ju Huang and Kang Liu are with the Shaanxi Key Laboratory of Ocean Optics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China, and also with the University of Chinese Academy of Sciences, Beijing 100049, China (e-mail: juhuang_iopen@ 163.com; liukang@opt.ac.cn).

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20210074510

Title:Semantics-consistent representation learning for remote sensing image-voice retrieval

Authors:Ning, Hailong (1, 2, 3); Zhao, Bin (4); Yuan, Yuan (4)

Author affiliation:(1) Shaanxi Key Laboratory of Ocean Optics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Electronics (iOPEN), Northwestern Polytechnical University, Xi'an; 710072, China; (4) School of Artificial Intelligence, Optics and Electronics (iOPEN), Northwestern Polytechnical University, Xi'an; 710072, China

Source title:arXiv

Abbreviated source title:arXiv

Issue date:March 9, 2021

Publication year:2021

Language:English

E-ISSN:23318422

Document type:Preprint (PP)

Publisher:arXiv

Abstract:<div data-language="eng" data-ev-field="abstract">With the development of earth observation technology, massive amounts of remote sensing (RS) images are acquired. To find useful information from these images, cross-modal RS image-voice retrieval provides a new insight. This paper aims to study the task of RS image-voice retrieval so as to search effective information from massive amounts of RS data. Existing methods for RS image-voice retrieval rely primarily on the pairwise relationship to narrow the heterogeneous semantic gap between images and voices. However, apart from the pairwise relationship included in the datasets, the intra-modality and non-paired inter-modality relationships should also be taken into account simultaneously, since the semantic consistency among non-paired representations plays an important role in the RS image-voice retrieval task. Inspired by this, a semantics-consistent representation learning (SCRL) method is proposed for RS image-voice retrieval. The main novelty is that the proposed method takes the pairwise, intra-modality, and non-paired inter-modality relationships into account simultaneously, thereby improving the semantic consistency of the learned representations for the RS image-voice retrieval. The proposed SCRL method consists of two main steps: 1) semantics encoding and 2) semantics-consistent representation learning. Firstly, an image encoding network is adopted to extract high-level image features with a transfer learning strategy, and a voice encoding network with dilated convolution is devised to obtain high-level voice features. Secondly, a consistent representation space is conducted by modeling the three kinds of relationships to narrow the heterogeneous semantic gap and learn semantics-consistent representations across two modalities. Extensive experimental results on three challenging RS image-voice datasets, including Sydney, UCM and RSICD image-voice datasets, show the effectiveness of the proposed method.<br/></div> © 2021, CC BY.

Number of references:56

Main heading:Semantics

Controlled terms:Encoding (symbols) - Image enhancement - Learning systems - Remote sensing - Signal encoding - Space optics

Uncontrolled terms:Earth Observation Technology - Heterogeneous semantic gap - Intermodality - Learning methods - Remote sensing image-voice retrieval - Remote sensing images - Semantic consistency - Semantic gap - Semantic-consistent representation - Voice retrieval

Classification code:656.1 Space Flight - 716.1 Information Theory and Signal Processing - 723.2 Data Processing and Image Processing - 741.1 Light/Optics

Database:Compendex

Preprint source website:https://arxiv.org

Preprint ID type:ARXIV

Accession number:20214911280709

Title:Real-Time Study of Coexisting States in Laser Cavity Solitons

Author affiliation:(1) Emergent Photonics (Epic) Lab, Dept. of Physics and Astronomy, University of Sussex, BN1 9QH, United Kingdom; (2) Department of Physics, City University of Hong Kong, Tat Chee Avenue, Hong Kong, Hong Kong; (3) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics, CAS, Xi'an, China; (4) INRS-EMT, 1650 Boulevard Lionel-Boulet, Varennes; QC; J3X 1S2, Canada; (5) Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology, Chengdu, China; (6) Optical Sciences Centre, Swinburne University of Technology, Hawthorn; VIC; 3122, Australia; (7) Xlim Research Institute, CNRS UMR 7252, Université de Limoges, Limoges; 87060, France

Source title:2021 Conference on Lasers and Electro-Optics, CLEO 2021 - Proceedings

Abbreviated source title:Conf. Lasers Electro-Opt., CLEO - Proc.

Part number:1 of 1

Issue title:2021 Conference on Lasers and Electro-Optics, CLEO 2021 - Proceedings

Issue date:May 2021

Publication year:2021

Language:English

ISBN-13:9781943580910

Document type:Conference article (CA)

Conference name:2021 Conference on Lasers and Electro-Optics, CLEO 2021

Conference date:May 9, 2021 - May 14, 2021

Conference location:Virtual, Online, United states

Conference code:173264

Publisher:Institute of Electrical and Electronics Engineers Inc.

Number of references:5

Main heading:Optical fibers

Controlled terms:Solitons - Optical fiber communication

Uncontrolled terms:Cavity solitons - Co-existing state - Dispersive Fourier transforms - Microcombs - Real-time studies

Classification code:717.1 Optical Communication Systems - 741.1.2 Fiber Optics

Database:Compendex

Accession number:20213710888744

Title:Hyperspectral anomaly detection via super-resolution reconstruction with an attention mechanism

Authors:Chong, Dan (1, 2); Hu, Bingliang (1); Gao, Hao (3); Gao, Xiaohui (1)

Author affiliation:(1) Key Laboratory of Spectral Imaging Technology of Chinese Academy of Sciences, Xi'an Institute of Optics and Precision Mechanics, No. 17 Xinxi Road, Xi'an; 710119, China; (2) Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing; 100049, China; (3) The Key Laboratory of Network Data Science and Technology, Institute of Computing Technology, Chinese Academy of Sciences, No. 6 KeXueYuan South Road, Haidian District, Beijing; 100190, China

Corresponding author:Gao, Xiaohui(gaoxhui@163.com)

Source title:Applied Optics

Abbreviated source title:Appl. Opt.

Volume:60

Issue:26

Issue date:September 10, 2021

Publication year:2021

Pages:8109-8119

Language:English

ISSN:1559128X

E-ISSN:21553165

CODEN:APOPAI

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">Hyperspectral anomaly detection aims to classify the anomalous objects in the scene. However, the spatial resolution of the hyperspectral images is relatively low, leading to inaccurate detection of abnormal pixels. Existing methods either ignore the low-resolution problem or leverage super-resolution models to reconstruct the global image to detect abnormal pixels.We claim that reconstructing super-resolution of the global image is unnecessary, while the area where the abnormal target is located should be paid more attention to be reconstructed. In this paper, we propose a super-resolution reconstruction with an attention mechanism for hyperspectral anomaly detection. Our method can automatically extract additional high-frequency information from low-spatial-resolution images and detect abnormal pixels simultaneously. Furthermore, the spatial-channel attention mechanism is adopted to select significant features for reconstructing super-resolution images by assigning different weights to different channels and different spatial-spectral locations. Finally, a regularized join loss function is proposed that balances different tasks by adjusting the relative weight. The experimental results on the public hyperspectral real datasets demonstrate that the proposed method outperforms the state-of-the-art methods.<br/></div> © 2021 Optical Society of America.

Number of references:48

Main heading:Pixels

Controlled terms:Image reconstruction - Anomaly detection - Image resolution - Spectroscopy

Uncontrolled terms:Attention mechanisms - High-frequency informations - Hyperspectral anomaly detection - Spatial resolution - Spatial resolution images - State-of-the-art methods - Super resolution reconstruction - Super-resolution models

Classification code:741.1 Light/Optics

DOI:10.1364/AO.432704

Database:Compendex

Accession number:20212510544366

Title:Density saliency for clustered building detection and population capacity estimation

Authors:Liu, Kang (1, 2); Huang, Ju (1, 2); Xu, Mingliang (3); Perc, Matjaž (4); Li, Xuelong (5, 6)

Author affiliation:(1) Shaanxi Key Laboratory of Ocean Optics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) School of Information Engineering, Zhengzhou University, Zhengzhou; 450001, China; (4) Faculty of Natural Sciences and Mathematics, University of Maribor, Koro&scaron;ka cesta 160, Maribor; SI-2000, Slovenia; (5) School of Artificial Intelligence, Optics and Electronics (iOPEN), Northwestern Polytechnical University, Xi'an; 710072, China; (6) Key Laboratory of Intelligent Interaction and Applications (Northwestern Polytechnical University), Ministry of Industry and Information Technology, Xi'an; 710072, China

Corresponding author:Li, Xuelong(i@nwpu.edu.cn)

Source title:Neurocomputing

Abbreviated source title:Neurocomputing

Volume:458

Issue date:October 7, 2021

Publication year:2021

Pages:127-140

Language:English

ISSN:09252312

E-ISSN:18728286

CODEN:NRCGEO

Document type:Journal article (JA)

Publisher:Elsevier B.V.

Abstract:<div data-language="eng" data-ev-field="abstract">Building detection is a critically important task in the field of remote sensing and it is conducive to urban construction planning, disaster survey, shantytown modification, and emergency landing, it etc. However, few studies have focused on the task of the clustered building detection which is inescapable and challenging for some relatively low space resolution images. The appearance structures of those buildings are not clear enough for the single-building detection. Whereas, it has been found that the distributions of clustered buildings are mostly dense and cellular, while the backgrounds are not. This clue will be beneficial to the clustered building detection. Motivated by the fact above and other similar density estimation applications, this work mainly focuses on the information mining mechanism of dense and cellular structure. Firstly, we propose a concept of Clustered Building Detection (CBD), which contributes to develop clustered building detection techniques of remote sensing images. Secondly, a saliency estimation algorithm is proposed to mine the prior information for the clustered buildings. Thirdly and most notably, combining with the CBD and the density saliency map, a Population Capacity Estimation (PCE) method is presented. The PCE can be easily used to estimate the population carrying capacity of certain areas and future applied for national land resource management. Moreover, a Clustered Building Detection Dataset (CBDD) from Gaofen-2 satellite is annotated and contributed for the public research. The experimental results by the representative detection algorithms manifest the effectiveness for the clustered building detection.<br/></div> © 2021 Elsevier B.V.

Number of references:66

Main heading:Remote sensing

Controlled terms:Buildings - Deep neural networks - Space optics - Land use

Uncontrolled terms:Building detection - Building population - Capacity estimation - Clustered building detection - Construction planning - Deep neural network - Population capacity estimation - Remote-sensing - Saliency heatmap - Urban construction

Classification code:402 Buildings and Towers - 403 Urban and Regional Planning and Development - 461.4 Ergonomics and Human Factors Engineering - 656.1 Space Flight - 741.1 Light/Optics

DOI:10.1016/j.neucom.2021.06.002

Funding details: Number: 61871470, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: QYZDY-SSW-JSC044, Acronym: CAS, Sponsor: Chinese Academy of Sciences;

Funding text:This work is supported by the Key Research Program of Frontier Sciences, Chinese Academy of Sciences (No. QYZDY-SSW-JSC044), and by the National Natural Science Foundation of China (No. 61871470).

Database:Compendex

Accession number:20214711208454

Title:Fiber interferometers for time-domain quantum optics

Authors:MacLellan, Benjamin (1); Roztocki, Piotr (1, 2); Islam, Mehedi (1); Reimer, Christian (1, 3); Fischer, Bennet (1); Sciara, Stefania (1, 4); Helsten, Robin (1); Jestin, Yoann (1, 2); Cino, Alfonso (4); Chu, Sai T. (5); Little, Brent (6); Moss, David J. (7); Kues, Michael (8, 9); Morandotti, Roberto (1, 10)

Author affiliation:(1) Institut National de la Recherche Scientifique (INRS-EMT), Varennes; QC, Canada; (2) Ki3 Photonics Technologies, Montreal; QC, Canada; (3) HyperLight Corporation, Cambridge; MA, United States; (4) Department of Engineering, University of Palermo, Palermo, Italy; (5) Department of Physics, City University of Hong Kong, Hong Kong; (6) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Science, Xi'an, China; (7) Optical Sciences Centre, Swinburne University of Technology, Hawthorn; VIC, Australia; (8) deu, Hannover, Hannover; (9) deu, Hannover, Hannover; (10) chn, Chengdu, Chengdu

Corresponding author:Morandotti, Roberto(morandotti@emt.inrs.ca)

Source title:Optics InfoBase Conference Papers

Abbreviated source title:Opt. InfoBase Conf. Pap

Part number:1 of 1

Issue title:CLEO: QELS_Fundamental Science, CLEO: QELS 2021

Issue date:2021

Publication year:2021

Article number:JTu3A.131

Language:English

ISBN-13:9781557528209

Document type:Conference article (CA)

Conference name:CLEO: QELS_Fundamental Science, CLEO: QELS 2021 - Part of Conference on Lasers and Electro-Optics, CLEO 2021

Conference date:May 9, 2021 - May 14, 2021

Conference location:Virtual, Online, United states

Conference code:174076

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">A novel method for stabilizing fiber interferometers based on frequency- and polarization-multiplexing enables unambiguous phase retrieval, long-term stability, and phase-independent performance. These capabilities allow for precise manipulation of time-bin quantum states in a low-complexity setup.<br/></div> © OSA 2021, © 2021 The Author(s)

Number of references:10

Main heading:Quantum optics

Controlled terms:Interferometers - Time domain analysis

Uncontrolled terms:Fiber interferometers - Frequency multiplexing - Long term stability - Novel methods - Performance - Phase retrieval - Phase-independent - Polarization multiplexing - Precise manipulation - Time domain

Classification code:741.1 Light/Optics - 921 Mathematics - 931.4 Quantum Theory; Quantum Mechanics - 941.3 Optical Instruments

Database:Compendex

Accession number:20214911280576

Title:Fiber Interferometers for Time-domain Quantum Optics

Author affiliation:(1) Institut National de la Recherche Scientifique (INRS-EMT), Varennes; QC, Canada; (2) Ki3 Photonics Technologies, Montreal; QC, Canada; (3) HyperLight Corporation, Cambridge; MA, United States; (4) Department of Engineering, University of Palermo, Palermo, Italy; (5) Department of Physics, City University of Hong Kong, Hong Kong, Hong Kong; (6) State Key Laboratory of Transient Optics and Photonics, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Science, Xi'an, China; (7) Optical Sciences Centre, Swinburne University of Technology, Hawthorn; VIC, Australia; (8) Institute of Photonics, Leibniz University of Hannover, Hannover, Germany; (9) Hannover Centre for Optical Technologies, Leibniz University of Hannover, Hannover, Germany; (10) Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, China

Source title:2021 Conference on Lasers and Electro-Optics, CLEO 2021 - Proceedings

Abbreviated source title:Conf. Lasers Electro-Opt., CLEO - Proc.

Part number:1 of 1

Issue title:2021 Conference on Lasers and Electro-Optics, CLEO 2021 - Proceedings

Issue date:May 2021

Publication year:2021

Language:English

ISBN-13:9781943580910

Document type:Conference article (CA)

Conference name:2021 Conference on Lasers and Electro-Optics, CLEO 2021

Conference date:May 9, 2021 - May 14, 2021

Conference location:Virtual, Online, United states

Conference code:173264

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">A novel method for stabilizing fiber interferometers based on frequency-and polarization-multiplexing enables unambiguous phase retrieval, long-term stability, and phase-independent performance. These capabilities allow for precise manipulation of time-bin quantum states in a low-complexity setup.<br/></div> © 2021 OSA.

Number of references:10

Main heading:Quantum optics

Controlled terms:Optical fibers - Interferometers - Time domain analysis - Optical fiber communication

Classification code:717.1 Optical Communication Systems - 741.1 Light/Optics - 741.1.2 Fiber Optics - 921 Mathematics - 931.4 Quantum Theory; Quantum Mechanics - 941.3 Optical Instruments

Database:Compendex

Accession number:20210402193

Title:Atomistic evidence of nucleation mechanism for the direct graphite-to-diamond transformation

Authors:Luo, Duan (1, 2, 3); Yang, Liuxiang (4); Xie, Hongxian (5); Srinivasan, Srilok (1); Tian, Jinshou (2); Sankaranarayanan, Subramanian (1); Arslan, Ilke (1); Yang, Wenge (4); Mao, Ho-Kwang (4, 6); Wen, Jianguo (1)

Author affiliation:(1) Center for Nanoscale Materials, Argonne National Laboratory, Lemont; IL; 60439, United States; (2) Key Laboratory of Ultra-Fast Photoelectric Diagnostics Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China; (4) Center for High Pressure Science and Technology Advanced Research, Beijing; 100094, China; (5) Hebei University of Technology, Tianjin; 300132, China; (6) Geophysical Laboratory, Carnegie Institution of Washington, Washington; DC; 20015, United States

Corresponding authors:Yang, Wenge(yangwg@hpstar.ac.cn); Mao, Ho-kwang(maohk@hpstar.ac.cn); Wen, Jianguo(jwen@anl.gov)

Source title:arXiv

Abbreviated source title:arXiv

Issue date:November 26, 2021

Publication year:2021

Language:English

E-ISSN:23318422

Document type:Preprint (PP)

Publisher:arXiv

Abstract:<div data-language="eng" data-ev-field="abstract">The direct graphite-to-diamond transformation mechanism has been a subject of intense study and remains debated concerning the initial stages of the conversion, the intermediate phases, and their transformation pathways. Here, we successfully recover samples at early conversion stage by tuning high-pressure/high-temperature conditions and reveal direct evidence supporting the nucleation-growth mechanism. Atomistic observations show that intermediate orthorhombic graphite phase mediates the growth of diamond nuclei. Furthermore, we observe that quenchable orthorhombic and rhombohedra graphite are stabilized in buckled graphite at lower temperatures. These intermediate phases are further converted into hexagonal and cubic diamond at higher temperatures following energetically favorable pathways in the order: graphite → orthorhombic graphite → hexagonal diamond, graphite → orthorhombic graphite → cubic diamond, graphite → rhombohedra graphite → cubic diamond. These results significantly improve our understanding of the transformation mechanism, enabling the synthesis of different high-quality forms of diamond from graphite.<br/></div> Copyright © 2021, The Authors. All rights reserved.

Number of references:44

Main heading:Graphite

Controlled terms:Diamonds - Nucleation

Uncontrolled terms:Atomistics - Cubic diamond - Hexagonal diamond - High pressure high temperature - High temperature condition - Intermediate phasis - Nucleation growth - Nucleation mechanism - Transformation mechanisms - Transformation pathways

Classification code:482.2.1 Gems - 933.1.2 Crystal Growth

Database:Compendex

Preprint source website:https://arxiv.org

Preprint ID type:ARXIV

Accession number:20212810613369

Title:A Deformable Convolutional Neural Network with Oriented Response for Fine-Grained Visual Classification (Open Access)

Authors:Ruan, Shangxian (1); Yang, Jiating (2); Chen, Jianbo (3)

Author affiliation:(1) Amazingx Academy, Foshan, China; (2) Xian Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xian, China; (3) University of Chinese Academy of Sciences, Beijing, China

Source title:ACM International Conference Proceeding Series

Abbreviated source title:ACM Int. Conf. Proc. Ser.

Part number:1 of 1

Issue title:2021 13th International Conference on Machine Learning and Computing, ICMLC 2021

Issue date:February 26, 2021

Publication year:2021

Pages:133-140

Article number:3457702

Language:English

ISBN-13:9781450389310

Document type:Conference article (CA)

Conference name:2021 13th International Conference on Machine Learning and Computing, ICMLC 2021

Conference date:February 26, 2021 - March 1, 2021

Conference location:Virtual, Online, China

Conference code:169701

Publisher:Association for Computing Machinery

Abstract:<div data-language="eng" data-ev-field="abstract">Fine-grained visual classification (FGVC) aims to classify images belonging to the same basic category in a more detailed sub-category. It is a challenging research topic in the field of computer vision and pattern recognition in recent years. The existing FGVC method conduct the task by considering the part detection of the object in the image and its variants, which rarely pays attention to the difference in expression of many changes such as object size, posture, and perspective. As a result, these methods generally face two major difficulties: 1) How to effectively pay attention to the latent semantic region, and reduce the interference caused by many changes in pose and perspective; 2) How to extract rich feature information for non-rigid and weak structure objects. In order to solve these two problems, this paper proposes a deformable convolutional neural network with oriented response for FGVC. The proposed method can be divided into three main steps: firstly, the local region of latent semantic information is localized based on a lightweight CAM network; then, the deformable convolutional ResNet-50 network and the rotation-invariant coding oriented response network are designed, which input the original image and local region into the feature network to learn the discriminant features of rotation invariance; finally, the learned features are embed into a joint loss to optimize the entire network end-to-end. Experiments are carried out on three challenging FGVC datasets, including CUB-200-2011, FGVC_Aircraft and Aircraft_2 datasets. The results show that the accuracy of the proposed method on all datasets is better than the comparison method, which can effectively improve the accuracy of weakly supervised FGVC.<br/></div> © 2021 ACM.

Number of references:25

Main heading:Convolution

Controlled terms:Convolutional neural networks - Image coding - Deformation - Object detection - Semantics

Uncontrolled terms:Comparison methods - Latent semantics - Original images - Research topics - Rich features - Rotation invariance - Rotation invariant - Visual classification

Classification code:716.1 Information Theory and Signal Processing - 723.2 Data Processing and Image Processing

DOI:10.1145/3457682.3457702

Funding details: Number: 2018cxy13, Acronym: YU, Sponsor: Yangtze University;

Funding text:The authors would like to thank all the people who kindly helped us in conducting this study. This work was supported by the Social Science Foundation and Student Work Research Project of Yangtze University under Grant 2018cxy13.

Database:Compendex

Open Access type(s): All Open Access, Bronze

Accession number:20211210123555

Title:Cross-model retrieval with deep learning for business application (Open Access)

Authors:Wang, Yufei (1); Wang, Huanting (2, 3); Yang, Jiating (2); Chen, Jianbo (3)

Author affiliation:(1) Simon Fraser University, 8888 University Dr, Bumaby; BC; V5A 1S6, Canada; (2) Xian Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xian, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Yang, Jiating(yangjiating@opt.ac.cn)

Source title:IOP Conference Series: Earth and Environmental Science

Abbreviated source title:IOP Conf. Ser. Earth Environ. Sci.

Volume:1802

Part number:3 of 4

Issue:3

Issue title:7th International Conference on Computer-Aided Design, Manufacturing, Modeling and Simulation, CDMMS 2020 - 2. Algorithm Design and Computational Science

Issue date:March 9, 2021

Publication year:2021

Article number:032035

Language:English

ISSN:17551307

E-ISSN:17551315

Document type:Conference article (CA)

Conference name:2020 7th International Conference on Computer-Aided Design, Manufacturing, Modeling and Simulation, CDMMS 2020

Conference date:November 14, 2020 - November 15, 2020

Conference location:Busan, Korea, Republic of

Conference code:167760

Publisher:IOP Publishing Ltd

Abstract:Cross-modal retravel has been used in many fields, such as business and search engines. Most search engines for business are text-based, but text-based search engines are limited by equipment and the strict requirement for knowledge. Text-based search needs keyboards to finish the search process, which requires users to have the knowledge of using keyboards. Compared to the text-based search, audio-based search has advantages. First, it avoids the traditional ways of inputting information. And it gets rid of the gap in time between inputting information for searching and getting useful information. In this paper, we propose a way to use audio to search images for business applications. We use deep learning to implement cross-modal retrieval systems between images and audio. We first extract features from images and audio respectively. And then we implement a neural network with two identical networks to learn the correspondence between images and audio. The first network extracts the features from images and audio further for calculation, and the second network learns whether two features from different modalities are related. This research provides a new way for business applications to search for information more instantly.<br/> © Published under licence by IOP Publishing Ltd.

Number of references:20

Main heading:Search engines

Controlled terms:Information use - Deep learning - Image processing

Uncontrolled terms:Audio-based - Business applications - Cross model - Cross-modal - Retrieval systems - Search image - Search process

Classification code:461.4 Ergonomics and Human Factors Engineering - 723 Computer Software, Data Handling and Applications - 723.2 Data Processing and Image Processing - 903.3 Information Retrieval and Use

DOI:10.1088/1742-6596/1802/3/032035

Database:Compendex

Open Access type(s): All Open Access, Bronze

Accession number:20212810626511

Title:Progress of research on high energy laser component

Authors:Shen, Zeyi (1); Xin, Wei (1); Song, Yang (1)

Author affiliation:(1) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China

Corresponding author:Xin, Wei(xinwei@opt.ac.cn)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11849

Part number:1 of 1

Issue title:Fourth International Symposium on High Power Laser Science and Engineering, HPLSE 2021

Issue date:2021

Publication year:2021

Article number:118490W

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510645424

Document type:Conference article (CA)

Conference name:4th International Symposium on High Power Laser Science and Engineering, HPLSE 2021

Conference date:April 12, 2021 - April 26, 2021

Conference location:Suzhou, China

Conference code:169923

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">Laser weapon is a complex system, which consists of laser, optical system, ATP (Acuisition Tracking Pointing)system, electronic control system and so on. It needs the close cooperation of structure, optics, electronics and other disciplines. Laser weapon has developed rapidly in recent years, and developed countries have increased investment in experiments. Laser weapon has the advantages of high cost-effectiveness ratio and light speed attack. It has been applied in vehicle, shipboard and airborne, and may develop into space application in the future. In recent years, drones play an increasingly important role in the battlefield. Laser weapon is a powerful weapon to deal with drones. Laser weapons can be classified into chemical lasers, solid-state lasers, free electron lasers and so on. Solid state laser will be an important direction of laser development in the future.<br/></div> © 2021 SPIE.

Number of references:10

Main heading:Cost effectiveness

Controlled terms:Free electron lasers - High energy lasers - Drones - Solid state lasers - Electrons - Investments - Optical systems

Uncontrolled terms:Developed countries - Electronic control systems - High costs - Laser weapons

Classification code:652.1 Aircraft, General - 741.3 Optical Devices and Systems - 744.1 Lasers, General - 744.4 Solid State Lasers - 744.5 Free Electron Lasers - 911.2 Industrial Economics

DOI:10.1117/12.2598929

Database:Compendex

Accession number:20214411103438

Title:Numerical simulation study on gain nonlinearity of microchannel plate in photomultiplier tube

Authors:Guo, Lehui (1); Chen, Ping (1); Li, Lili (1); Gou, Yongsheng (1); Liu, Hulin (1); Liu, Ziyu (1); Xin, Liwei (1); Tian, Jinshou (1)

Author affiliation:(1) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences (CAS), Xi’an; 710119, China

Source title:IEEE Transactions on Nuclear Science

Abbreviated source title:IEEE Trans Nucl Sci

Volume:68

Issue:12

Issue date:December 1, 2021

Publication year:2021

Pages:2711-2716

Language:English

ISSN:00189499

E-ISSN:15581578

CODEN:IETNAE

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">Microchannel plate-photomultiplier tubes (MCP-PMTs) with high dynamic ranges and strong outputs are still challenges for the future inertial confinement fusion (ICF) studies, aiming at detecting the large-scale intensities of the radiation pulses. In this article, to investigate the influence factors of the gain nonlinearity causing high-linearity limits of the MCP-PMTs, 3-D microchannel plate (MCP) channel models were built in computer simulation technology (CST) Particle Studio. The Monte Carlo and particle-in-cell methods were carried out to simulate the electron cascade processes in the channels of the MCPs. The dependences of MCP gain nonlinearity on the number of incident electrons, operating voltage, and secondary electron emission (SEE) yield properties were studied. The gains obtained by the simulations for the conventional one-stage and two-stage MCPs are in good agreement with the available experimental data, which verifies the reliabilities of the 3-D MCP models. The simulation results show that the gain of the MCP single channel decreases as the number of incident electrons increases due to the space charge effects. The higher the operating voltage and SEE yield of the MCP, the faster the gain deteriorates. To mitigate the gain saturation effect of MCP single channels, a novel structural design of MCP-PMTs has been proposed by adjusting the design of the MCP chevron pair. A significant improvement in the output pulse peak can be obtained.<br/></div> 0018-9499 © 2021 IEEE.

Number of references:19

Main heading:Monte Carlo methods

Controlled terms:Microchannels - Photomultipliers - Electrons - Plates (structural components) - Secondary emission - Structural design - Image storage tubes - Inertial confinement fusion - Numerical models

Uncontrolled terms:Dynamic range - Gain nonlinearities - Incident electrons - Micro channel plate - Micro-channel plate photomultiplier tubes - Microchannel-plate photomultiplier tubes - Operating voltage - Solid modelling - Three-dimensional display - Voltage electrons

Classification code:408.1 Structural Design, General - 408.2 Structural Members and Shapes - 714.1 Electron Tubes - 921 Mathematics - 922.2 Mathematical Statistics - 932.2.1 Fission and Fusion Reactions

DOI:10.1109/TNS.2021.3121583

Database:Compendex

Accession number:20213210745070

Title:Highly versatile broadband RF photonic fractional Hilbert transformer based on a Kerr soliton crystal microcombs (Open Access)

Authors:Tan, Mengxi (1); Xu, Xingyuan (2); Boes, Andreas (3); Corcoran, Bill (4); Wu, Jiayang (5); Nguyen, Thach G. (6); Chu, St (7); Little, Brent (8); Mitchell, Arnan (9); Lowery, Arthur J. (10); Morandotti, Roberto (11); Moss, David J (12)

Author affiliation:(1) Center for Microphotonics, Swinburne University of Technology, 3783 Hawthorn, Victoria, Australia, (e-mail: mengxitan@swin.edu.au); (2) electrical and computer engineering, Monash University, 2541 Clayton, Victoria, Australia, (e-mail: mike.xu@monash.edu); (3) School of Engineering, RMIT University, Melbourne, Victoria, Australia, (e-mail: andreas.boes@rmit.edu.au); (4) Electrical and Computer Systems Engineering, Monash University, Melbourne, Victoria, Australia, (e-mail: bill.corcoran@monash.edu); (5) Centre for Micro-Photonics, Swinburne University of Technology, 3783 Hawthorn, Victoria, Australia, 3122 (e-mail: jiayangwu@swin.edu.au); (6) School of Electrical and Computer Engineering, RMIT University, Melbourne, Victoria, Australia, 3001 (e-mail: thach.nguyen@rmit.edu.au); (7) Physics, City University of Hong Kong, Kowloon, Hong Kong, Hong Kong, (e-mail: saitchu@cityu.edu.hk); (8) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, 53046 Xi'an, Shaanxi, China, (e-mail: brent.little@opt.ac.cn); (9) School of Electrical and Computer Engineering, RMIT University, Melbourne, Victoria, Australia, 3001 (e-mail: arnan.mitchell@rmit.edu.au); (10) Electrical & Computer Systems Engineering, Monash University, Clayton, VIC, Victoria, Australia, (e-mail: arthur.lowery@monash.edu); (11) EMT, INRS-EMT, Varennes, Quebec, Canada, (e-mail: morandotti@emt.inrs.ca); (12) Center for Microphotonics, Swinburne University of Technology, 3783 Hawthorn, Victoria, Australia, (e-mail: dmoss@swin.edu.au)

Source title:Journal of Lightwave Technology

Abbreviated source title:J Lightwave Technol

Issue date:2021

Publication year:2021

Language:English

ISSN:07338724

E-ISSN:15582213

CODEN:JLTEDG

Document type:Article in Press

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">We demonstrate an RF photonic fractional Hilbert transformer based on an integrated Kerr micro-comb source featuring a record low free spectral range of 49 GHz, yielding 75 microcomb lines across the C-band. By programming and shaping the comb lines according to calculated tap weights, we demonstrate that the Hilbert transformer can achieve tunable bandwidths ranging from 1.2 to 15.3 GHz, variable center frequencies from baseband to 9.5 GHz, and arbitrary fractional orders. We experimentally characterize the RF amplitude and phase response of the tunable bandpass and lowpass Hilbert transformers with 90 and 45-degree phase shift. The experimental results show good agreement with theory, confirming the effectiveness of our approach as a powerful way to implement the standard as well as fractional Hilbert transformers with broad and variable processing bandwidths and centre frequencies, together with high reconfigurability and reduced size and complexity.<br/></div> IEEE

Main heading:Optical fibers

Controlled terms:Optical signal processing - Bandwidth - Optical fiber fabrication - Integrated optics - Mathematical transformations - Optical fiber communication - Optical resonators - Solitons - C (programming language)

Uncontrolled terms:Center frequency - Centre frequency - Fractional order - Free spectral range - Hilbert transformers - Processing bandwidths - Reconfigurability - Tunable bandwidth

Classification code:716.1 Information Theory and Signal Processing - 717.1 Optical Communication Systems - 723.1.1 Computer Programming Languages - 741.1.2 Fiber Optics - 741.3 Optical Devices and Systems - 921.3 Mathematical Transformations

Numerical data indexing:Frequency 1.20e+09Hz to 1.53e+10Hz, Frequency 4.90e+10Hz, Frequency 9.50e+09Hz

DOI:10.1109/JLT.2021.3101816

Database:Compendex

Open Access type(s): All Open Access, Green

Accession number:20210509874619

Title:Monte Carlo simulation of laser illumination system using return photon counts

Authors:Li, Lanlan (1); Zhou, Lei (2)

Author affiliation:(1) School of Optoelectronic Engineering, Xian Technological University, Xian; 710021, China; (2) Xian Research Institute of Navigation Technology, Xian; 710068, China

Corresponding author:Zhou, Lei(zlandl3@163.com)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11761

Part number:1 of 1

Issue title:Fourth International Conference on Photonics and Optical Engineering

Issue date:2021

Publication year:2021

Article number:117610Y

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510643574

Document type:Conference article (CA)

Conference name:4th International Conference on Photonics and Optical Engineering

Conference date:October 15, 2020 - October 16, 2020

Conference location:Xi'an, China

Conference code:166676

Publisher:SPIE

Abstract:In order to further study the performance of laser illumination systems, a Monte Carlo simulation system is established for the return photons when laser illuminating the target. The physical process of photons from the emission to reception is simulated. The laser illumination system involves vacuum laser transmitting, atmospheric turbulence and return photons processing. Based on the simulation system, the quality of the laser far field spot is verified and the character of return photons is analyzed. The simulation results demonstrate that the simulation system performs well and satisfy requirements for research of laser illumination system with atmospheric turbulence.<br/> © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

Number of references:16

Main heading:Photons

Controlled terms:Intelligent systems - Atmospheric thermodynamics - Monte Carlo methods - Atmospheric turbulence

Uncontrolled terms:Far field - Laser illuminating - Laser illumination - Photon count - Physical process - Simulation systems

Classification code:443.1 Atmospheric Properties - 631.1 Fluid Flow, General - 641.1 Thermodynamics - 723.4 Artificial Intelligence - 922.2 Mathematical Statistics - 931.3 Atomic and Molecular Physics

DOI:10.1117/12.2587239

Funding details: Number: 15GDYJY02, Acronym: -, Sponsor: -;Number: 15JS035, Acronym: -, Sponsor: -;Number: 61704134, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:This work was supported by the National Natural Science Foundation of China [No.61704134], Key Laboratory of Shaanxi Provincial Department of Education [No. 15JS035] and the Dean Fund of the School of Optoelectronic Engineering, Xi’an Technological University, China [No.15GDYJY02].

Database:Compendex

Accession number:20214811231833

Title:Integral order photonic RF signal processors based on a soliton crystal micro-comb source (Open Access)

Authors:Tan, Mengxi (1); Xu, Xingyuan (8); Wu, Jiayang (1); Corcoran, Bill (2); Boes, Andreas (3); Nguyen, Thach G. (3); Chu, Sai T. (4); Little, Brent E. (5); Morandotti, Roberto (6, 7); Mitchell, Arnan (3); Moss, David J. (1)

Author affiliation:(1) Optical Sciences Centre, Swinburne University of Technology, Hawthorn; VIC; 3122, Australia; (2) Department of Electrical and Computer Systems Engineering, Monash University, Clayton; VIC; 3800, Australia; (3) ARC Centre of Excellence for Ultrahigh-bandwidth Devices for Optical Systems (CUDOS), RMIT University, Melbourne; VIC; 3001, Australia; (4) Department of Physics, City University of Hong Kong, Tat Chee Avenue, Hong Kong, Hong Kong; (5) Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China; (6) INRS-Énergie, Matériaux et Télécommunications, 1650 Boulevard Lionel-Boulet, Varennes; QC; J3X 1S2, Canada; (7) Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu; 610054, China; (8) Electro-Photonics Laboratory, Department of Electrical and Computer System Engineering, Monash University, Clayton; VIC; 3800, Australia

Corresponding author:Moss, David J.(dmoss@swin.edu.au)

Source title:Journal of Optics (United Kingdom)

Abbreviated source title:J. Opt.

Volume:23

Issue:12

Issue date:December 2021

Publication year:2021

Article number:125701

Language:English

ISSN:20408978

E-ISSN:20408986

Document type:Journal article (JA)

Publisher:IOP Publishing Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">Soliton crystal micro-combs are powerful tools as sources of multiple wavelength channels for radio frequency (RF) signal processing. They offer a compact device footprint, a large number of wavelengths, very high versatility, and wide Nyquist bandwidths. Here, we demonstrate integral order RF signal processing functions based on a soliton crystal micro-comb, including a Hilbert transformer and first, second and third-order differentiators. We compare and contrast the results and the trade-offs involved with varying the comb spacing, and tap design and shaping methods.<br/></div> © 2021 IOP Publishing Ltd

Number of references:92

Main heading:Solitons

Controlled terms:Economic and social effects - Signal processing - Optical resonators

Uncontrolled terms:Comb source - Compact devices - Hilbert transformers - Multiple wavelength channels - Nyquist bandwidth - Photonic radios - Radio-frequency photonics - Radio-frequency signal processing - Radiofrequency signals - Signal processor

Classification code:716.1 Information Theory and Signal Processing - 741.3 Optical Devices and Systems - 971 Social Sciences

DOI:10.1088/2040-8986/ac2eab

Funding details: Number: -, Acronym: NSERC, Sponsor: Natural Sciences and Engineering Research Council of Canada;Number: DP150104327, Acronym: ARC, Sponsor: Australian Research Council;Number: -, Acronym: -, Sponsor: Canada Research Chairs;Number: XDB24030000, Acronym: CAS, Sponsor: Chinese Academy of Sciences;

Funding text:This work was supported by the Australian Research Council Discovery Projects Program (No. DP150104327). RM acknowledges support by the Natural Sciences and Engineering Research Council of Canada (NSERC) through the Strategic, Discovery and Acceleration Grants Schemes, and by the Canada Research Chair Program. Brent E Little was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences, Grant No. XDB24030000.

Database:Compendex

Open Access type(s): All Open Access, Green

Accession number:20212010360078

Title:Bifurcation-tunable Diffractionless Light Propagation in One-dimensional Non-Hermitian Photonic Lattice

Title of translation:一维非厄密光子晶格中分叉可调无衍射光传输

Authors:Liu, Zhenjuan (1); Wang, Haohao (1); Dai, Yanan (1); Zhang, Zhiqing (1); Wang, Yishan (2); Qi, Xinyuan (1)

Author affiliation:(1) School of Physics, Northwestern University, Xi'an; 710027, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China

Corresponding author:Qi, Xinyuan(qixycn@nwu.edu.cn)

Source title:Guangzi Xuebao/Acta Photonica Sinica

Abbreviated source title:Guangzi Xuebao

Volume:50

Issue:4

Issue date:April 25, 2021

Publication year:2021

Article number:0423003

Language:Chinese

ISSN:10044213

CODEN:GUXUED

Document type:Journal article (JA)

Publisher:Chinese Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">The light bifurcation transmission without diffraction in one-dimensional periodic compound photonic lattice was studied theoretically and numerically. When the lattice equals to degenerated Su-Schrieffer-Heeger model, the incident light with the wave number k=±π will bifurcate into two symmetric branches without any diffraction and the angles between two beams can be controlled by the coupling J between two lattice sites. In addition, a modulation phase φ is introduced. When the non-Hermitian perturbations satisfy the parity-time symmetry, the diffractionless light bifurcation phenomenon with any incident light wave can be realized as long as the incident wave vector k and the modulation phase φ respect the expression k+φ=±π. Further studies have shown that the next-nearest coupling can control the transmission angle and power division of two branches. This research provides new ideas for the design of optical switches and future all-optical paths.<br/></div> © 2021, Science Press. All right reserved.

Number of references:22

Main heading:Optical lattices

Controlled terms:Bifurcation (mathematics) - Light transmission - Modulation - Transmissions - Diffraction - Optical switches - Photonics - Incident light

Uncontrolled terms:Bifurcation phenomena - Incident light - Incident light waves - Incident waves - Parity-time symmetries - Power division - Su Schrieffer Heeger model - Transmission angle

Classification code:602.2 Mechanical Transmissions - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 744.8 Laser Beam Interactions

DOI:10.3788/gzxb20215004.0423003

Funding details: Number: 91950104, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: SKLST201805, Acronym: SKLTOP, Sponsor: State Key Laboratory of Transient Optics and Photonics;

Funding text:Open Research Fund of State Key Laboratory of Transient Optics and Photonics (No.SKLST201805), Natural Science Foundation of China(No.91950104).

Database:Compendex

Accession number:20210809937521

Title:Monocular depth estimation based on a single image: A literature review

Authors:Tian, Yuan (1, 2); Hu, Xiaodong (1)

Author affiliation:(1) Xian Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, China; (2) University of Chinese Academy of Sciences, China

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11720

Part number:1 of 1

Issue title:Twelfth International Conference on Graphics and Image Processing, ICGIP 2020

Issue date:2021

Publication year:2021

Article number:117201Z

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510642775

Document type:Conference article (CA)

Conference name:12th International Conference on Graphics and Image Processing, ICGIP 2020

Conference date:November 13, 2020 - November 15, 2020

Conference location:Xi'an, China

Conference code:167013

Sponsor:Chang'an University; et al.; Foshan University; Northwest A and F University; Ocean University of China; Sichuan University

Publisher:SPIE

Abstract:Monocular depth estimation is a very valuable but also very challenging problem. In order to solve this ill-posed problem, traditional approaches apply depth cues such as defocusing, atmospheric scattering and shading to estimate depth information and approaches based on machine learning apply frameworks such as MRF and data-driven learning. With the development of deep learning, the monocular depth estimation approaches based on CNN and other networks have achieved good results and gradually become the mainstream. In this paper, we summarize some typical and representative literature on monocular depth estimation based on a single image in the past two decades and depict our analysis involved in these approaches. In addition, this paper also analyzes and compares the results obtained by some typical approaches, which may provide some guidance for those who are interested in this field.<br/> © 2021 SPIE.

Number of references:60

Main heading:Deep learning

Controlled terms:Structural frames - Magnetorheological fluids

Uncontrolled terms:Atmospheric scattering - Depth Estimation - Depth information - Ill posed problem - Literature reviews - On-machines - Single images - Traditional approaches

Classification code:408.2 Structural Members and Shapes - 461.4 Ergonomics and Human Factors Engineering - 708.4 Magnetic Materials

DOI:10.1117/12.2589510

Database:Compendex

Accession number:20210609904074

Title:A Novel Negative-Transfer-Resistant Fuzzy Clustering Model with a Shared Cross-Domain Transfer Latent Space and its Application to Brain CT Image Segmentation

Authors:Jiang, Yizhang (1, 2); Gu, Xiaoqing (3); Wu, Dongrui (4); Hang, Wenlong (5); Xue, Jing (6); Qiu, Shi (7); Lin, Chin-Teng (8)

Author affiliation:(1) Jiangsu Key Laboratory of Media Design and Software Technology, Jiangnan University, Wuxi, Jiangsu; 214122, China; (2) School of Digital Media, Jiangnan University, Wuxi, Jiangsu; 214122, China; (3) School of Information Science and Engineering, Changzhou University, Changzhou, Jiangsu; 213164, China; (4) Key Laboratory of the Ministry of Education for Image Processing and Intelligent Control, School of Automation, Huazhong University of Science and Technology, Wuhan, Hubei; 430074, China; (5) School of Computer Science and Technology, Nanjing Tech University, Nanjing, Jiangsu; 211816, China; (6) Department of Nephrology, Affiliated Wuxi People's Hospital of Nanjing Medical University, Wuxi, Jiangsu; 214023, China; (7) Laboratory of Spectral Imaging Technology CAS, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, Shaanxi; 710119, China; (8) Centre of Artificial Intelligence, Faculty of Engineering and Information Technology, University of Technology Sydney, Ultimo; NSW; 2007, Australia

Source title:IEEE/ACM Transactions on Computational Biology and Bioinformatics

Abbreviated source title:IEEE/ACM Trans. Comput. BioL. Bioinf.

Volume:18

Issue:1

Issue date:January-February 2021

Publication year:2021

Pages:40-52

Article number:8949741

Language:English

ISSN:15455963

E-ISSN:15579964

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:Traditional clustering algorithms for medical image segmentation can only achieve satisfactory clustering performance under relatively ideal conditions, in which there is adequate data from the same distribution, and the data is rarely disturbed by noise or outliers. However, a sufficient amount of medical images with representative manual labels are often not available, because medical images are frequently acquired with different scanners (or different scan protocols) or polluted by various noises. Transfer learning improves learning in the target domain by leveraging knowledge from related domains. Given some target data, the performance of transfer learning is determined by the degree of relevance between the source and target domains. To achieve positive transfer and avoid negative transfer, a negative-transfer-resistant mechanism is proposed by computing the weight of transferred knowledge. Extracting a negative-transfer-resistant fuzzy clustering model with a shared cross-domain transfer latent space (called NTR-FC-SCT) is proposed by integrating negative-transfer-resistant and maximum mean discrepancy (MMD) into the framework of fuzzy c-means clustering. Experimental results show that the proposed NTR-FC-SCT model outperformed several traditional non-transfer and related transfer clustering algorithms.<br/> © 2004-2012 IEEE.

Number of references:43

Main heading:Fuzzy clustering

Controlled terms:Clustering algorithms - Computerized tomography - Image segmentation - Cluster analysis - Knowledge management - Medical imaging

Uncontrolled terms:Cross-domain - Degree of relevance - Fuzzy C means clustering - Fuzzy clustering modeling - ITS applications - SCT model - Target domain - Traditional clustering

Classification code:461.1 Biomedical Engineering - 723 Computer Software, Data Handling and Applications - 723.5 Computer Applications - 746 Imaging Techniques - 903.1 Information Sources and Analysis - 903.3 Information Retrieval and Use

DOI:10.1109/TCBB.2019.2963873

Funding details: Number: 61702225,61711540041,61772241,61806026, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: BK20160187,BK20161268,BK20180956, Acronym: -, Sponsor: Natural Science Foundation of Jiangsu Province;Number: XYDXX-127, Acronym: -, Sponsor: Six Talent Peaks Project in Jiangsu Province;Number: JUSRP11737,JUSRP51614A, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;Number: -, Acronym: -, Sponsor: Qinglan Project of Jiangsu Province of China;

Funding text:This work was supported in part by the National Natural Science Foundation of China under Grants 61806026, 61702225, 61772241, and 61711540041, in part by the Natural Science Foundation of Jiangsu Province under Grants BK20180956, BK20161268, and BK20160187, in part by the Fundamental Re-search Funds for the Central Universities under Grants JUSRP51614A and JUSRP11737, in part by 2016 Qinglan Project of Jiangsu Province, and in part by Six Talent Peaks Project of Jiangsu Province under Grant XYDXX-127.

Database:Compendex

Accession number:20210809938434

Title:Hardware design of an image acquisition device for target observation and tracking (Open Access)

Authors:Bian, He (1); Zhang, Haifeng (1); Wang, Hua (1); Huang, Jijiang (1)

Author affiliation:(1) Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China

Corresponding author:Bian, He(hebian@opt.cn)

Source title:IOP Conference Series: Earth and Environmental Science

Abbreviated source title:IOP Conf. Ser. Earth Environ. Sci.

Volume:632

Part number:4 of 5

Issue:4

Issue title:2020 Asia Conference on Geological Research and Environmental Technology - Number 4

Issue date:January 13, 2021

Publication year:2021

Article number:042043

Language:English

ISSN:17551307

E-ISSN:17551315

Document type:Conference article (CA)

Conference name:2020 Asia Conference on Geological Research and Environmental Technology, GRET 2020

Conference date:October 10, 2020 - October 11, 2020

Conference location:Kamakura City, Japan

Conference code:167012

Publisher:IOP Publishing Ltd

Abstract:In order to observe and track the separated targets in the air, This paper presents a hardware image acquisition platform based on three-way camera + FPGA + two-way DSP, Xilinx artix-7 series xc7a200t-2fbg676i FPGA is used as the main processor. It is mainly responsible for high-speed image acquisition, preprocessing, transmission and display, TMS320DM368 DSP of Texas Instruments is used as image compression processor. After receiving the image transmitted by artix-7 FPGA, the image H.264 is compressed. This architecture solves the delay problem of traditional image acquisition system in hardware architecture level, and realizes the real-time and high-speed image acquisition and processing. At the same time, the hardware has the basis of multi-channel image acquisition, multi-channel image compression, visible light and infrared camera acquisition data fusion.<br/> © 2021 IOP Conference Series: Earth and Environmental Science.

Number of references:9

Main heading:Image acquisition

Controlled terms:Image compression - Field programmable gate arrays (FPGA) - Cameras - Computer architecture - Target tracking - Data fusion - Integrated circuit design

Uncontrolled terms:Acquisition device - Hardware architecture - Hardware design - High speed image - Image acquisition systems - Infra-red cameras - Texas Instruments - Visible light

Classification code:714.2 Semiconductor Devices and Integrated Circuits - 721.2 Logic Elements - 723 Computer Software, Data Handling and Applications - 723.2 Data Processing and Image Processing - 742.2 Photographic Equipment

DOI:10.1088/1755-1315/632/4/042043

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20211310148440

Title:A new friction compensation method for photoelectric platform

Title of translation:一种光电稳定平台摩擦力新型补偿方法

Authors:Chang, Sansan (1); Gao, Bo (1); Zhang, Gaopeng (1); Bian, He (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710100, China

Corresponding author:Zhang, Gaopeng(sanandying0825@sina.com)

Source title:Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology)

Abbreviated source title:Zhongnan Daxue Xuebao (Ziran Kexue Ban)

Volume:52

Issue:2

Issue date:February 26, 2021

Publication year:2021

Pages:434-442

Language:Chinese

ISSN:16727207

CODEN:ZDXZAC

Document type:Journal article (JA)

Publisher:Central South University of Technology

Abstract:To reduce the negative influence of this disturbance and improve the stability accuracy of photoelectric platform, a new compensation scheme based on friction model was proposed. Firstly, the process of friction rejection by the traditional method was analyzed, and the method of combining the encoder and gyroscope to estimate the speed at low speed was proposed and the friction model was improved by the method. At the same time, an extended state observer(ESO)was introduced to observe and compensate for the error caused by the difference between the system model and the compensation model. The problem of system friction characteristics drift with the environment and other factors in the work was solved. Finally, in order to verify the effectiveness of the method, the speed stability experiment was carried out on the three-axis swing table. The results show that the compensation effect of the near zero speedis is raised by improved friction model. Compared with the traditional method, the speed stability and the isolation degree increase by 67% and 58%, respectively, and the isolation degree can still be maintained when the friction model parameter perturbation is 10%, presentingstrong robustness. This method is easy to be realized in engineering and has a high practical value for compensating for the friction force of photoelectric platform to improve the stability accuracy.<br/> © 2021, Central South University Press. All right reserved.

Number of references:20

Main heading:Stability

Controlled terms:Friction - Photoelectricity - State estimation - Error compensation - Speed

Uncontrolled terms:Compensation effects - Compensation modeling - Compensation scheme - Extended state observer - Friction characteristics - Friction compensation - Friction modeling - Photo-electric platform

Classification code:701.1 Electricity: Basic Concepts and Phenomena - 731.1 Control Systems - 741.1 Light/Optics

Numerical data indexing:Percentage 1.00e+01%, Percentage 5.80e+01%, Percentage 6.70e+01%

DOI:10.11817/j.issn.1672-7207.2021.02.011

Funding details: Number: 2019JQ-295, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: -, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;

Funding text:Project(51905529) supported by the National Natural Science Foundation of China; Project(2019JQ-295) supported by the Natural Science Basic Research Program of Shaanxi Province.收稿日期：2020−04−25； 修回日期 ：2020−06−30 基金项目(Foundation item) ：国家自然科学基金资助项目(51905529)；陕西省自然科学基础研究计划(2019JQ-295) (Project (51905529) supported by the National Natural Science Foundation of China; Project(2019JQ-295) supported by the Natural ScienceBasicResearchProgramofShaanxiProvince) 通信作者：张高鹏，博士，助理研究员，从事光电系统总体设计研究；E-mail：sanandying0825@sina.com

Database:Compendex

Accession number:20213310767949

Title:Mechanism of All-Optical Spatial Light Modulation in Graphene Dispersion

Authors:Liu, Shan (1, 2); Han, Jing (1); Cheng, Xuemei (1, 2); Wang, Xing (2); Zhang, Qian (3); He, Bo (1); Jiao, Tengfei (1); Ren, Zhaoyu (1)

Author affiliation:(1) State Key Laboratory of Photon-Technology in Western China Energy, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics and Photon-Technology, Northwest University, Xi'an; 710069, China; (2) State Key Laboratory of Transient Optics and Photonics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) School of Electronic Engineering, Xi'An University of Posts and Telecommunications, Xi'an; 710121, China

Corresponding authors:Cheng, Xuemei(xmcheng@nwu.edu.cn); Ren, Zhaoyu(rzy@nwu.edu.cn)

Source title:Journal of Physical Chemistry C

Abbreviated source title:J. Phys. Chem. C

Volume:125

Issue:30

Issue date:August 5, 2021

Publication year:2021

Pages:16598-16604

Language:English

ISSN:19327447

E-ISSN:19327455

Document type:Journal article (JA)

Publisher:American Chemical Society

Abstract:<div data-language="eng" data-ev-field="abstract">Graphene is a superb material with significant potential in broadband all-optical modulation. However, the mechanism of the all-optical modulation in graphene dispersion is still under debate. Here, we report on a pump power-dependent spatial light modulation by using the 780 nm CW laser as the pump and signal beams via graphene dispersion. The results indicate that graphene is able to convert the Gaussian signal beam into a hollow beam with a ring pattern. Examining the temporal evolution of the ring pattern, we found that spatial cross-phase modulation (SXPM) plays the dominant role at low pump power, while nonlinear scattering (NLS) becomes dominant when the pump power is high. Furthermore, the dependence of the size and intensity of the signal ring pattern on the pump power is investigated. The results can be well explained by SXPM, NLS, and saturation absorption (SA) effects. Finally, an all-optical switch is developed based on the dependence of the signal intensity on the pump power. It is demonstrated that both in-phase and out-phase modulation can be realized in one system. This work not only provides useful information in understanding the mechanism of graphene in interacting with the light, but also suggests a new way to produce hollow beam with tunable size and achieve an all-optical switch with both in-phase and out-phase modulation.<br/></div> © 2021 American Chemical Society.

Number of references:59

Main heading:Graphene

Controlled terms:Gaussian beams - Continuous wave lasers - Light modulators - Phase modulation - Pumping (laser) - Dispersions - Light modulation - Optical signal processing - Optical switches

Uncontrolled terms:All optical switch - Cross phase modulation - Graphene dispersions - Nonlinear scattering - Saturation absorption - Signal intensities - Spatial light modulation - Temporal evolution

Classification code:711 Electromagnetic Waves - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 744.1 Lasers, General - 761 Nanotechnology - 804 Chemical Products Generally - 951 Materials Science

DOI:10.1021/acs.jpcc.1c04423

Funding details: Number: 2018TD-018, Acronym: -, Sponsor: -;Number: 11874299,22073074,61805200, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2020JM-432, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;Number: SKLST201906, Acronym: SKLTOP, Sponsor: State Key Laboratory of Transient Optics and Photonics;

Funding text:This work is supported by the funds from the National Natural Science Foundation of China (NSFC) (11874299, 61805200, and 22073074), Natural Science Foundation of Shaanxi Province (No. 2020JM-432), State Key Laboratory of Transient Optics and Photonics (SKLST201906), and Innovation capability support plan of Shaanxi province (No. 2018TD-018).

Database:Compendex

Accession number:20210398474

Title:Delving into rectifiers in style-based image translation

Authors:Zhang, Yipeng (1, 2, 3); Hu, Bingliang (1, 2); Ning, Hailong (4); Wang, Quang (1, 2)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics; (2) The Key laboratory of Biomedical Spectroscopy of Xi'an; (3) University of Chinese Academy of Sciences; (4) Xi'an University of Posts & Telecommunications

Corresponding author:Wang, Quang(wangquan@opt.ac.cn)

Source title:arXiv

Abbreviated source title:arXiv

Issue date:November 20, 2021

Publication year:2021

Language:English

E-ISSN:23318422

Document type:Preprint (PP)

Publisher:arXiv

Abstract:<div data-language="eng" data-ev-field="abstract">While modern image translation techniques can create photorealistic synthetic images, they have limited style controllability, thus could suffer from translation errors. In this work, we show that the activation function is one of the crucial components in controlling the direction of image synthesis. Specifically, we explicitly demonstrated that the slope parameters of the rectifier could change the data distribution and be used independently to control the direction of translation. To improve the style controllability, two simple but effective techniques are proposed, including Adaptive ReLU (AdaReLU) and structural adaptive function. The AdaReLU can dynamically adjust the slope parameters according to the target style and can be utilized to increase the controllability by combining with Adaptive Instance Normalization (AdaIN). Meanwhile, the structural adaptative function enables rectifiers to manipulate the structure of feature maps more effectively. It is composed of the proposed structural convolution (StruConv), an efficient convolutional module that can choose the area to be activated based on the mean and variance specified by AdaIN. Extensive experiments show that the proposed techniques can greatly increase the network controllability and output diversity in style-based image translation tasks.<br/>MSC Codes 68T07<br/></div> © 2021, CC BY-NC-ND.

Number of references:42

Main heading:Convolution

Controlled terms:Controllability - Rectifying circuits

Uncontrolled terms:Activation functions - Adaptive functions - Data distribution - Image translation - Images synthesis - Normalisation - Photo-realistic - Simple++ - Slope parameter - Synthetic images

Classification code:716.1 Information Theory and Signal Processing - 731.1 Control Systems

Database:Compendex

Preprint source website:https://arxiv.org

Preprint ID type:ARXIV

Accession number:20220209769

Title:Dark gap solitons in periodic nonlinear media with competing cubic-quintic nonlinearities

Authors:Chen, Junbo (1); Zeng, Jianhua (1)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China

Corresponding author:Zeng, Jianhua(zengjh@opt.ac.cn)

Source title:ResearchSquare

Abbreviated source title:ResearchSquare

Issue date:March 23, 2021

Publication year:2021

Language:English

Document type:Preprint (PP)

Publisher:ResearchSquare

Abstract:<div data-language="eng" data-ev-field="abstract">Solitons are nonlinear self-sustained wave excitations and probably among the most interesting and exciting emergent nonlinear phenomenon in the corresponding theoretical settings. Bright solitons with sharp peak and dark solitons with central notch have been well known and observed in various nonlinear systems. The interplay of periodic potentials, like photonic crystals and lattices in optics and optical lattices in ultracold atoms, with the dispersion has brought about gap solitons within the finite band gaps of the underlying linear Bloch-wave spectrum and, particularly, the bright gap solitons have been experimentally observed in these nonlinear periodic systems, while little is known about the underlying physics of dark gap solitons. Here, we theoretically and numerically investigate the existence, property and stability of one-dimensional gap solitons and soliton clusters in periodic nonlinear media with competing cubic-quintic nonlinearity, the higher-order of which is self-defocusing and the lower-order (cubic) one is chosen as self-defocusing or focusing nonlinearities. By means of the conventional linear-stability analysis and direct numerical calculations with initial perturbations, we identify the stability and instability areas of the corresponding dark gap solitons and clusters ones.<br/></div> © 2021, CC BY.

Number of references:70

Main heading:Optical lattices

Controlled terms:Bose-Einstein condensation - Control nonlinearities - Energy gap - Linear stability analysis - Nonlinear equations - Nonlinear optics - Nonlinear systems - Solitons - Statistical mechanics

Uncontrolled terms:Bose-Einstein condensates - Cubic-quintic nonlinearity - Dark gap soliton - Gap soliton - Non-linear phenomenon - Nonlinear medium - Nonlinear schrödinge equation - Nonlinear-medium - Self-defocusing - Wave excitation

Classification code:731.1 Control Systems - 741.1.1 Nonlinear Optics - 744.8 Laser Beam Interactions - 921 Mathematics - 922.2 Mathematical Statistics - 931.1 Mechanics - 931.2 Physical Properties of Gases, Liquids and Solids - 931.3 Atomic and Molecular Physics - 961 Systems Science

DOI:10.21203/rs.3.rs-292763

Database:Compendex

Accession number:20212810623856

Title:Research on multi-sensor high dynamic range imaging technology and application

Authors:Guo, Lulu (1); Yi, Hongwei (1)

Author affiliation:(1) Space Optical Technology Laboratory, Xi'an Institute of Optical Precision Machinery Chinese Academy of Sciences, Xi'an, China

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11850

Part number:1 of 1

Issue title:First Optics Frontier Conference

Issue date:2021

Publication year:2021

Article number:118500B

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510645448

Document type:Conference article (CA)

Conference name:1st Optics Frontier Conference 2021

Conference date:April 24, 2021 - April 26, 2021

Conference location:Hangzhou, China

Conference code:169924

Sponsor:The Society of Photo-Optical Instrumentation Engineers (SPIE)

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">In dynamic scene imaging, multi-sensor high dynamic range (HDR) fusion technology used to solve the ghosting problem of multi-exposure fusion based on camera aperture, and achieve high-quality HDR video imaging. Therefore, it has made significant progress in image capture and synthesis of HDR optical imaging. First, we introduce the development status of multi-sensor based on time bracketing and space bracketing. Then introduce the different method of multi-exposure image fusion, including aligning different exposures, rejecting misalignment information and patch-based optimization. Finally, discuss the key technical issues and development trends of this technology in HDR imaging technology.<br/></div> © 2021 SPIE.

Number of references:52

Main heading:Cameras

Controlled terms:Image fusion - Image processing - Optical data processing

Uncontrolled terms:Camera aperture - Development status - Development trends - Fusion technology - High dynamic range - High dynamic range imaging - Multi-exposure images - Optical imaging

Classification code:723.2 Data Processing and Image Processing - 742.2 Photographic Equipment

DOI:10.1117/12.2599254

Database:Compendex

Accession number:20220411511204

Title:Expanded Edge Penalty Loss for Salient Object Detection

Authors:Wang, Nan (1); Shi, Yuetian (1); Fang, Jie (2); Yang, Fanchao (1); Zhang, Geng (1); Li, Siyuan (1); Liu, Xuebin (1)

Author affiliation:(1) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China; (2) School of Communications and Information Engineering School of Artificial Intelligence, Xi'an University of Posts Telecommunications, Shaanxi, Xi'an; 710121, China

Source title:2021 4th International Conference on Information Communication and Signal Processing, ICICSP 2021

Abbreviated source title:Int. Conf. Inf. Commun. Signal Process., ICICSP

Part number:1 of 1

Issue title:2021 4th International Conference on Information Communication and Signal Processing, ICICSP 2021

Issue date:2021

Publication year:2021

Pages:363-367

Language:English

ISBN-13:9781665407571

Document type:Conference article (CA)

Conference name:4th International Conference on Information Communication and Signal Processing, ICICSP 2021

Conference date:September 24, 2021 - September 26, 2021

Conference location:Shanghai, China

Conference code:174853

Sponsor:Science and Technology on Communication Networks Laboratory

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">As an indispensable preprocessing technique for image understanding, salient object detection aims to extract interesting regions from an image for subsequent processing, which has attracted much attention since its wide range of applications. Recently, with the rapid development of artificial intelligence and machine learning, deep neural network especially deep convolutional neural network based methods have achieved competitive performances because of their strong feature representation capability. However, most of these methods often suffer from coarse boundaries. The main reason is that equal penalty factor is applied to each pixel in the image to optimize the network, but there are huge distinctions in prediction complexity among different ones actually. Specifically, pixels closer to the boundaries are increasingly difficult because of their huge gaps between structural information and semantic label. In these cases, we present an Expanded Edge Penalty Loss (EPL) for salient object detection. EPL gives bigger penalty factors to pixels distributed in boundary and near-boundary regions, and further dynamically adjusts their contributions to the model optimization. In addition, the experimental results on five public and challenging datasets have validated the superiority and effectiveness of the proposed method.<br/></div> © 2021 IEEE.

Number of references:20

Main heading:Pixels

Controlled terms:Computer vision - Convolutional neural networks - Deep neural networks - Object detection - Object recognition - Semantics

Uncontrolled terms:Coarse object boundary - Competitive performance - Expanded edge penalty loss - Network-based - Object boundaries - Penalty factor - Penalty loss - Pre-processing techniques - RGB images - Salient object detection

Classification code:461.4 Ergonomics and Human Factors Engineering - 723.2 Data Processing and Image Processing - 723.5 Computer Applications - 741.2 Vision

DOI:10.1109/ICICSP54369.2021.9611977

Funding details: Number: -, Acronym: YIPA CAS, Sponsor: Youth Innovation Promotion Association of the Chinese Academy of Sciences;

Funding text:ACKNOWLEDGEMENT This work was supported by Youth Innovation Promotion Association CAS.

Database:Compendex

Accession number:20210209744690

Title:Modified snapshot spectroscopic ellipsometry based on optical frequency-domain interferometry

Authors:Li, Siyuan (1, 2); Zhang, Chunmin (3); Quan, Naicheng (1, 4)

Author affiliation:(1) Chinese Academy of Sciences, Xi'an Institute of Optics and Precision Mechanics, Key Laboratory of Spectral Imaging Technology CAS, Xi'an, China; (2) University of Chinese Academy of Sciences, Beijing, China; (3) Xi'an Jiaotong University, Xi'an, China; (4) School of Materials Science and Engineering, Xi'an University of Technology, Xi'an, China

Corresponding author:Li, Siyuan(lsy@opt.ac.cn)

Source title:Optik

Abbreviated source title:Optik

Volume:228

Issue date:February 2021

Publication year:2021

Article number:166165

Language:English

ISSN:00304026

Document type:Journal article (JA)

Publisher:Elsevier GmbH

Abstract:We propose a modified snapshot spectroscopic ellipsometry based on optical frequency-domain interferometry. The proposed system employs only one high-order retarder and a Wollaston prism to analyze the changed state of polarization of the reflected light and can provide the maximum channel bandwidth of the channeled spectroscopic ellipsometry. The spectroscopic ellipsometric parameters of isotropic samples can be accurately measured in a measurement speed of 40 ms without mechanical or active modulation devices. The feasibility of the proposed spectroscopic ellipsometry is demonstrated by experiments.<br/> © 2020

Number of references:19

Main heading:Spectroscopic ellipsometry

Controlled terms:Natural frequencies - Optical materials - Frequency domain analysis - Interferometry - Bandwidth

Uncontrolled terms:Channel bandwidth - Ellipsometric parameters - Isotropic samples - Measurement speed - Optical frequency domain - Reflected light - State of polarization - Wollaston prism

Classification code:716.1 Information Theory and Signal Processing - 741.3 Optical Devices and Systems - 921.3 Mathematical Transformations - 941.4 Optical Variables Measurements

Numerical data indexing:Time 4.00e-02s

DOI:10.1016/j.ijleo.2020.166165

Funding details: Number: 61805193, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: -, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: -, Acronym: -, Sponsor: Youth Innovation Promotion Association of the Chinese Academy of Sciences;

Funding text:The authors thank the anonymous reviewers for their helpful comments and constructive suggestions. The work was supported by Youth Innovation Promotion Association of Chinese Academy of Sciences , The Open Research Fund of Key Laboratory of Spectral Imaging Technology and Chinese Academy of Sciences ; National Natural Science Foundation of China ( 61805193 ).

Database:Compendex

Accession number:20214611180022

Title:Analysis of Influence of Change in Field of View on Dynamic Glare Evaluation

Title of translation:视野范围变化对动态眩光评价的影响分析

Authors:Zhang, Heng (1); Qiao, Weidong (1); Wang, Jiaming (1); Li, Yi (2)

Author affiliation:(1) School of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, Xi'an; 710048, China; (2) Optical Metrology and Test Center, Shaanxi Institute of Metrology Science, Xi'an; 710100, China

Corresponding author:Qiao, Weidong(qwd@xaut.edu.cn)

Source title:Guangxue Xuebao/Acta Optica Sinica

Abbreviated source title:Guangxue Xuebao

Volume:41

Issue:17

Issue date:September 10, 2021

Publication year:2021

Article number:1733001

Language:Chinese

ISSN:02532239

CODEN:GUXUDC

Document type:Journal article (JA)

Publisher:Chinese Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">In light of the shortcomings of threshold increments in evaluating dynamic glare, starting from the visual characteristics of human eyes, this paper proposes a dynamic glare evaluation method based on the principle of brightness contrast analysis and builds a dynamic glare evaluation model. With the change in the field of view of human eyes as the starting point, the influence factor of the change in driving speed on the driver's perception of the equivalent light curtain brightness in the lighting environment is studied. A variety of mathematical models are used to determine the relationship of driving speed with the ratio between dynamic and static equivalent light curtain brightness at the corresponding driving speed to explore the dynamic and static glare difference coefficient. The experimental results show that the difference coefficient is positively correlated with the driving speed of the drivers. From the analysis of goodness of fit and variance test, the relationship between the dynamic and static glare difference coefficient and the driving speed can be best described with an exponential function model. This evaluation method can lay a foundation for the establishment of a dynamic glare evaluation system and provide design basis and solutions for road lighting design in China.<br/></div> © 2021, Chinese Lasers Press. All right reserved.

Number of references:25

Main heading:Luminance

Controlled terms:Glare - Highway planning - Speed - Lighting - Roads and streets - Exponential functions

Uncontrolled terms:Brightness contrast analyse - Difference coefficients - Driving speed - Dynamic glare - Equivalent light curtain brightness - Evaluation methods - Field of views - Human eye - Light curtains - Visual optics

Classification code:406.2 Roads and Streets - 432.1 Highway Transportation, General - 912.2 Management - 921 Mathematics

DOI:10.3788/AOS202141.1733001

Database:Compendex

Accession number:20210509858682

Title:Novel Method Based on Hollow Laser Trapping-LIBS-Machine Learning for Simultaneous Quantitative Analysis of Multiple Metal Elements in a Single Microsized Particle in Air

Authors:Niu, Chen (1); Cheng, Xuemei (1); Zhang, Tianlong (2); Wang, Xing (3); He, Bo (1); Zhang, Wending (1); Feng, Yaozhou (2); Bai, Jintao (1); Li, Hua (2, 4)

Author affiliation:(1) State Key Laboratory of Photon-Technology in Western China Energy, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics and Photon-Technology, Northwest University, Xi'an; 710069, China; (2) Key Laboratory of Synthetic, Natural Functional Molecule of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an; 710127, China; (3) State Key Laboratory of Transient Optics and Photonics, Chinese Academy of Sciences, Xi'an; 710119, China; (4) College of Chemistry and Chemical Engineering, Xi'an Shiyou University, Xi'an; 710065, China

Corresponding authors:Cheng, Xuemei(xmcheng@nwu.edu.cn); Cheng, Xuemei(xmcheng@nwu.edu.cn); Zhang, Tianlong(tlzhang@nwu.edu.cn); Zhang, Tianlong(tlzhang@nwu.edu.cn)

Source title:Analytical Chemistry

Abbreviated source title:Anal. Chem.

Volume:93

Issue:4

Issue date:February 2, 2021

Publication year:2021

Pages:2281-2290

Language:English

ISSN:00032700

E-ISSN:15206882

CODEN:ANCHAM

Document type:Journal article (JA)

Publisher:American Chemical Society

Abstract:Elemental identification of individual microsized aerosol particles is an important topic in air pollution studies. However, simultaneous and quantitative analysis of multiple constituents in a single aerosol particle with the noncontact in situ manner is still a challenging task. In this work, we explore the laser trapping-LIBS-machine learning to analyze four elements (Zn, Ni, Cu, and Cr) absorbed in a single micro-carbon black particle in air. By employing a hollow laser beam for trapping, the particle can be restricted in a range as small as &sim;1.72 μm, which is much smaller than the focal diameter of the flat-topped LIBS exciting laser (&sim;20 μm). Therefore, the particle can be entirely and homogeneously radiated, and the LIBS spectrum with a high signal-to-noise ratio (SNR) is correspondingly achieved. Then, two types of calibration models, i.e., the univariate method (calibration curve) and the multivariate calibration method (random forests (RF) regression), are employed for data processing. The results indicate that the RF calibration model shows a better prediction performance. The mean relative error (MRE), relative standard deviation (RSD), and root-mean-squared error (RMSE) are reduced from 0.1854, 363.7, and 434.7 to 0.0866, 179.8, and 216.2 ppm, respectively. Finally, simultaneous and quantitative determination of the four metal contents with high accuracy is realized based on the RF model. The method proposed in this work has the potential for online single aerosol particle analysis and further provides a theoretical basis and technical support for the precise prevention and control of composite air pollution.<br/> © 2021 The Authors. Published by American Chemical Society.

Number of references:33

Main heading:Decision trees

Controlled terms:Laser beams - Aerosols - Metal nanoparticles - Machine learning - Metal analysis - Air pollution - Carbon black - Data handling - Mean square error - Random forests - Signal to noise ratio

Uncontrolled terms:Elemental identifications - High signalto-noise ratios (SNR) - Multivariate calibration methods - Prediction performance - Prevention and controls - Quantitative determinations - Relative standard deviations - Root mean squared errors

Classification code:451 Air Pollution - 716.1 Information Theory and Signal Processing - 723.2 Data Processing and Image Processing - 723.4 Artificial Intelligence - 723.4.2 Machine Learning - 744.8 Laser Beam Interactions - 761 Nanotechnology - 803 Chemical Agents and Basic Industrial Chemicals - 921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory - 922.2 Mathematical Statistics - 961 Systems Science

DOI:10.1021/acs.analchem.0c04155

Funding details: Number: 2018TD-018, Acronym: -, Sponsor: -;Number: 11874299,22073074,51927804,61805200,61805200 11874299, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2020JM-432, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;Number: SKLST201906, Acronym: SKLTOP, Sponsor: State Key Laboratory of Transient Optics and Photonics;

Funding text:We appreciate Dr. Dongbin Qian (Institute of Modern Physics Chinese Academy of Sciences) for the useful discussion and the funds from the National Natural Science Foundation of China (NSFC) (61805200 11874299, 22073074, 51927804), Natural Science Foundation of Shaanxi Province (No. 2020JM-432), the State Key Laboratory of Transient Optics and Photonics (SKLST201906), and Innovation capability support plan of Shaanxi province (No. 2018TD-018).We appreciate Dr. Dongbin Qian (Institute of Modern Physics, Chinese Academy of Sciences) for the useful discussion and the funds from the National Natural Science Foundation of China (NSFC) (61805200, 11874299, 22073074, 51927804), Natural Science Foundation of Shaanxi Province (No. 2020JM-432), the State Key Laboratory of Transient Optics and Photonics (SKLST201906), and Innovation capability support plan of Shaanxi province (No. 2018TD-018).

Database:Compendex

Accession number:20220511557102

Title:A Collaborative Modeling Method for Multi -behavior Models of Electromechanical CPS Systems

Authors:Niu, Wei (1); Huang, Wei (2); Cheng, Juan (3)

Author affiliation:(1) Research Institute, AVIC, Xi'An Aeronautics Computing Technique, Xi'an; 710065, China; (2) Xi'An North Jierui Opto-electronic, Technology CO., LT, Xi'an; 710065, China; (3) Xi'An Institute of Applied Optics, Xi'an; 710068, China

Source title:Proceedings - 2021 IEEE/ACIS 21st International Fall Conference on Computer and Information Science, ICIS 2021-Fall

Abbreviated source title:Proc. - IEEE/ACIS Int. Fall Conf. Comput. Inf. Sci., ICIS -Fall

Part number:1 of 1

Issue title:Proceedings - 2021 IEEE/ACIS 21st International Fall Conference on Computer and Information Science, ICIS 2021-Fall

Issue date:2021

Publication year:2021

Pages:14-17

Language:English

ISBN-13:9781728176796

Document type:Conference article (CA)

Conference name:21st IEEE/ACIS International Fall Conference on Computer and Information Science, ICIS 2021-Fall

Conference date:October 13, 2021 - October 15, 2021

Conference location:Xi�an, China

Conference code:175331

Sponsor:IEEE Computer Society; Institute of Electrical and Electronics Engineers (IEEE); International Association for Computer and Information Science (ACIS)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">Aiming at the characteristics of large heterogeneity and strong time constraint of airborne electromechanical system, an electromechanical event model and collaborative modeling method based on CPS is proposed. According to the complex characteristics of electrical, gas and hydraulic components of electromechanical system, the model describes the time and space information, proposes the system modeling and processing based on event response, adopts a unified model to capture all kinds of events in electromechanical CPS application, and provides upper level services across applications and data sources, The problem of semantic diversity of spatiotemporal data and consistency of interaction semantics of various models in electromechanical CPS system simulation is solved.<br/></div> © 2021 IEEE.

Number of references:12

Main heading:Semantics

Uncontrolled terms:Behaviour models - Collaborative modeling - Complex characteristics - CPS - Electrical components - Electromechanical systems - Event model - Gas component - Model method - Time constraints

DOI:10.1109/ICISFall51598.2021.9627356

Database:Compendex

Accession number:20203209009012

Title:Multiple Reliable Structured Patches for Object Tracking

Authors:Wu, Siyuan (1); Huang, Ju (1); Feng, Yachuang (1); Sun, Bangyong (1)

Author affiliation:(1) The Key Laboratory of Spectral Imaging Technology CAS, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China

Corresponding author:Feng, Yachuang(fengyachuang@opt.cn)

Source title:Cognitive Computation

Abbreviated source title:Cognitive Comput.

Volume:13

Issue:6

Issue date:November 2021

Publication year:2021

Pages:1593-1602

Language:English

ISSN:18669956

E-ISSN:18669964

Document type:Journal article (JA)

Publisher:Springer

Abstract:<div data-language="eng" data-ev-field="abstract">It is essential to build the effective appearance model for object tracking in computer vision. Most object trackers can be roughly divided into two categories according to the appearance model: the bounding box model and the patch model. The bounding box model cannot handle shape deformation and occlusion of the non-rigid moving object effectively. The patch model is prone to be disturbed by complex backgrounds. In this paper, we propose a robust multi-structured-patch appearance model to represent the target for object tracking. The proposed appearance model is aimed to exploit and identify reliable patches that can be tracked effectively through the whole tracking process. According to attention mechanism in biological vision system, a coarse-to-fine strategy is usually used to search the target. Therefore, the proposed appearance model is represented by robust patches in different sizes, in which the bigger patches search the rough region of the target and the smaller patches estimate the accurate location. Experimental results on OTB100 dataset show that the proposed method outperforms state-of-the-art trackers.<br/></div> © 2020, Springer Science+Business Media, LLC, part of Springer Nature.

Number of references:29

Main heading:Image segmentation

Uncontrolled terms:Accurate location - Appearance modeling - Attention mechanisms - Biological vision systems - Coarse-to-fine strategy - Complex background - Shape deformation - State of the art

DOI:10.1007/s12559-020-09741-5

Funding details: Number: 61702498, Acronym: NNSFC, NNSF, NSF, NSFC, Sponsor: National Natural Science Foundation of China;Number: 61806193,XAB2017B15, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2017YFB0502900, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Funding text:This work was supported in part by the National Natural Science Foundation of China under Grant 61702498, in part by the National Key R&D Program of China under Grant 2017YFB0502900, in part by the CAS Light of West China Program under Grant XAB2017B15, and in part by the National Natural Science Foundation of China under Grant 61806193.

Database:Compendex

Accession number:20220911705515

Title:Super-resolution Imaging Lidar based on Fourier Ptychography

Authors:Wang, Yuming (1, 2); Zhao, Hui (1); Yang, Mingyang (1, 2); Qu, Youshan (1); Fan, Xuewu (1)

Author affiliation:(1) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding authors:Zhao, Hui(zhaohui@opt.ac.cn); Fan, Xuewu(fanxuewu@opt.ac.cn)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12075

Part number:1 of 1

Issue title:10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Intelligent Sensing Technologies and Applications

Issue date:2021

Publication year:2021

Article number:120750M

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510650251

Document type:Conference article (CA)

Conference name:10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Intelligent Sensing Technologies and Applications 2021

Conference date:June 14, 2021 - June 17, 2021

Conference location:Chengdu, China

Conference code:176913

Sponsor:Institute of Optics and Electronics, Chinese Academy of Sciences; The Chinese Optical Society (COS)

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">Traditional imaging lidar exhibits an obvious trade-off between the resolution and the size of its optical system. In order to realize a miniaturized super-resolution (SR) imaging lidar, Fourier ptychography (FP) has been introduced to break through the diffraction limit of the camera lens. FP, derived from synthetic aperture method, is capable of acquiring high resolution and large field-of-view reconstructed images without increasing the aperture size by capturing multiple images with diverse incident angles before computationally combining with phase retrieval algorithm. In this work, a SR imaging lidar system was proposed by using reflective-type FP, which mainly consists of a s-CMOS camera, a Nd:YAG laser, and a 2-D translation stage so as to achieve aperture scanning on the x and y axes. To validate this technique experimentally, a set of images of a positive USAF chrome-on-glass target were obtained for quantitative analysis, and an uneven 1 yuan nickel-on-steel RMB coin was used to simulate the applicability of the SR imaging lidar in practical applications. The observations show that the obtained images based on FP technique have an obvious improvement in resolution, contrast, and clarity. It is worth mentioning that the resolution of these reconstructed images is increased over 3 times in the experiment on the USAF target. Moreover, the images under different apertures were collected, processed and analyzed, which suggest the initial image quality has a non-negligible influence on the reconstructed results. This technique not only improves the performance of the imaging lidar while maintaining low costs, but also bring new vitality in remote image recognition and analysis.<br/></div> © 2021 SPIE

Number of references:12

Main heading:Image enhancement

Controlled terms:Economic and social effects - Image analysis - Imaging systems - Diffraction - Synthetic apertures - Cameras - Neodymium lasers - Optical radar - Optical resolving power - Image reconstruction - Optical systems - Yttrium aluminum garnet - Image recognition

Uncontrolled terms:Aperture method - Diffraction limits - Fourier - Fourier ptychography - Imaging lidar - Phase retrieval - Reconstructed image - Super resolution imaging - Superresolution - Trade off

Classification code:716.2 Radar Systems and Equipment - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 742.2 Photographic Equipment - 744.4 Solid State Lasers - 746 Imaging Techniques - 804.2 Inorganic Compounds - 971 Social Sciences

DOI:10.1117/12.2604172

Database:Compendex

Accession number:20211310150442

Title:Simulation and analysis of atmospheric scattering in stray light testing for point source transmittance

Authors:Ma, Zhanpeng (1, 2); Chen, Qinfang (1); Wang, Hu (1, 2)

Author affiliation:(1) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Chen, Qinfang(cqf2009@opt.ac.cn)

Source title:Applied Optics

Abbreviated source title:Appl. Opt.

Volume:60

Issue:2

Issue date:January 10, 2021

Publication year:2021

Pages:232-238

Language:English

ISSN:1559128X

E-ISSN:21553165

CODEN:APOPAI

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:We propose a full-band model to quantitatively calculate terrestrial atmospheric scattering in stray light testing based on the Monte Carlo algorithm. Measurements are conducted using two classifications of air cleanliness at off-axis angles from 35<sup>◦</sup> to 90<sup>◦</sup>. Corresponding simulations of Mie scattering and Rayleigh scattering are used for a comparison with the measured values. The relative root mean square deviation of the simulation from the measurement result is 3.72% and 24.1% for Mie scattering and Rayleigh scattering, respectively. This exhibits excellent agreement between the measured and predicted values for a 26<sup>◦</sup> full-angle baffle when illuminated by a 550 mm diameter collimated beam.<br/> © 2021 Optical Society of America

Number of references:26

Main heading:Rayleigh scattering

Controlled terms:Stray light - Brillouin scattering

Uncontrolled terms:Atmospheric scattering - Collimated beams - Measured values - Monte carlo algorithms - Off-axis angles - Root mean square deviations - Simulation and analysis - Stray light testing

Classification code:711 Electromagnetic Waves - 741.1 Light/Optics

Numerical data indexing:Percentage 2.41e+01%, Percentage 3.72e+00%, Size 5.50e-01m

DOI:10.1364/AO.409656

Funding details: Number: 11803075, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:Funding. National Natural Science Foundation of China (11803075).

Database:Compendex

Accession number:20220911723600

Title:SiamPBN: Point-based Siamese Network for Rotating Objects Tracking

Authors:Yang, Chen (1); Zhang, Ximing (2); Li, Baopeng (1); Lei, Hao (2); Song, Zongxi (2)

Author affiliation:(1) University of Chinese Academy of Sciences, Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an, China; (2) Xi'an Institute of Optics and Precision Mechanics of CAS, Space Optical Research Lab, Xi'an, China

Corresponding author:Song, Zongxi(songxi@opt.ac.cn)

Source title:2021 7th International Conference on Computer and Communications, ICCC 2021

Abbreviated source title:Int. Conf. Comput. Commun., ICCC

Part number:1 of 1

Issue title:2021 7th International Conference on Computer and Communications, ICCC 2021

Issue date:2021

Publication year:2021

Pages:752-756

Language:English

ISBN-13:9781665409506

Document type:Conference article (CA)

Conference name:7th International Conference on Computer and Communications, ICCC 2021

Conference date:December 10, 2021 - December 13, 2021

Conference location:Chengdu, China

Conference code:176466

Sponsor:Sichuan Institute of Electronics (SIE)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">In recent years, the Siamese network based trackers have achieved outperforming results in the metrics of speed and accuracy in terms of visual tracking. However, it is difficult for the Siamese networks to achieve the accurate location of rotating objects. This paper proposes an efficient network architecture named SiamPBN to resolve rotation problem in tracking. We find that the predicted center of the object deviates from the center of the predicted box while the object rotates continuously. Therefore, we add a centerness head to the network to improve the performance of handling rotating objects. In addition, SiamPBN obtains the predicted outputs by point-based instead of anchor-based method, thus avoiding the complex computation associated with anchors. Our proposed method has gained the excellent performance on the datasets, including GOT-10k, LaSOT and VOT2019.<br/></div> © 2021 IEEE.

Number of references:21

Main heading:Network architecture

Controlled terms:Computer vision

Uncontrolled terms:Accurate location - Centerness - Complex computation - Network-based - Object Tracking - Performance - Point-based - Rotating objects - Rotation problem - Visual Tracking

Classification code:723.5 Computer Applications - 741.2 Vision

DOI:10.1109/ICCC54389.2021.9674679

Funding details: Number: 61906186, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2018YFC0115304, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Funding text:* Corresponding author. This work is supported by National Key Research and Development Program of China (2018YFC0115304); National Natural Science Foundation of China under Grant 61906186.

Database:Compendex

Accession number:20210045222

Title:High-throughput fast full-color digital pathology based on Fourier ptychographic microscopy via color transfer

Authors:Gao, Yuting (1, 2); Chen, Jiurun (1, 2); Wang, Aiye (1, 2); Pan, An (1); Ma, Caiwen (1); Yao, Baoli (1)

Author affiliation:(1) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding authors:Pan, An(panan@opt.cn); Ma, Caiwen(cwma@opt.ac.cn)

Source title:arXiv

Abbreviated source title:arXiv

Issue date:January 19, 2021

Publication year:2021

Language:English

E-ISSN:23318422

Document type:Preprint (PP)

Publisher:arXiv

Abstract:<div data-language="eng" data-ev-field="abstract">Full-color imaging is significant in digital pathology. Compared with a grayscale image or a pseudo-color image that only contains the contrast information, it can identify and detect the target object better with color texture information. Fourier ptychographic microscopy (FPM) is a high-throughput computational imaging technique that breaks the tradeoff between high resolution (HR) and large field-of-view (FOV), which eliminates the artifacts of scanning and stitching in digital pathology and improves its imaging efficiency. However, the conventional full-color digital pathology based on FPM is still time-consuming due to the repeated experiments with tri-wavelengths. A color transfer FPM approach, termed CFPM was reported. The color texture information of a low resolution (LR) full-color pathologic image is directly transferred to the HR grayscale FPM image captured by only a single wavelength. The color space of FPM based on the standard CIE-XYZ color model and display based on the standard RGB (sRGB) color space were established. Different FPM colorization schemes were analyzed and compared with thirty different biological samples. The average root-mean-square error (RMSE) of the conventional method and CFPM compared with the ground truth is 5.3% and 5.7%, respectively. Therefore, the acquisition time is significantly reduced by 2/3 with the sacrifice of precision of only 0.4%. And CFPM method is also compatible with advanced fast FPM approaches to reduce computation time further.<br/></div> Copyright © 2021, The Authors. All rights reserved.

Number of references:47

Main heading:Mean square error

Controlled terms:Color - Computational Imaging - E-learning - Fourier transforms - Object detection - Pathology - Textures

Uncontrolled terms:Color transfers - Color-texture information - Computational imaging - Digital pathologies - Fourier - Fourier ptychographic microscopy - Full color - High resolution - High-throughput - Transfer learning

Classification code:461.6 Medicine and Pharmacology - 723.2 Data Processing and Image Processing - 741.1 Light/Optics - 746 Imaging Techniques - 921.3 Mathematical Transformations - 922.2 Mathematical Statistics

Numerical data indexing:Percentage 4.00E-01%, Percentage 5.30E+00%, Percentage 5.70E+00%

Database:Compendex

Preprint source website:https://arxiv.org

Preprint ID type:ARXIV

Accession number:20211310131721

Title:Coherent synthetic aperture imaging for visible remote sensing via reflective Fourier ptychography (Open Access)

Authors:Xiang, Meng (1, 2); Pan, An (1, 2); Zhao, Yiyi (1); Fan, Xuewu (1); Zhao, Hui (1); Li, Chuang (1); Yao, Baoli (1)

Author affiliation:(1) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Li, Chuang(lichuang@opt.ac.cn)

Source title:Optics Letters

Abbreviated source title:Opt. Lett.

Volume:46

Issue:1

Issue date:January 1, 2021

Publication year:2021

Pages:29-32

Language:English

ISSN:01469592

E-ISSN:15394794

CODEN:OPLEDP

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:Synthetic aperture radar can measure the phase of a microwave with an antenna, which cannot be directly extended to visible light imaging due to phase lost. In this Letter, we report an active remote sensing with visible light via reflective Fourier ptychography, termed coherent synthetic aperture imaging (CSAI), achieving high resolution, a wide field-of-view (FOV), and phase recovery. A proof-of-concept experiment is reported with laser scanning and a collimator for the infinite object. Both smooth and rough objects are tested, and the spatial resolution increased from 15.6 to 3.48 µm with a factor of 4.5. The speckle noise can be suppressed obviously, which is important for coherent imaging. Meanwhile, the CSAI method can tackle the aberration induced from the optical system by one-step deconvolution and shows the potential to replace the adaptive optics for aberration removal of atmospheric turbulence.<br/> © 2020 Optical Society of America

Number of references:30

Main heading:Aberrations

Controlled terms:Optical systems - Synthetic aperture radar - Atmospheric turbulence - Synthetic apertures - Adaptive optics - Optical remote sensing - Light - Space optics

Uncontrolled terms:Coherent imaging - High resolution - Infinite objects - Phase recovery - Proof of concept - Spatial resolution - Synthetic aperture imaging - Wide field of view

Classification code:443.1 Atmospheric Properties - 631.1 Fluid Flow, General - 656.1 Space Flight - 716.2 Radar Systems and Equipment - 741.1 Light/Optics - 741.3 Optical Devices and Systems

DOI:10.1364/OL.409258

Funding details: Number: 61975233,81427802, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:Funding. Major Project on High Resolution Earth Observation System (GFZX04014307); National Natural Science Foundation of China (61975233, 81427802).

Database:Compendex

Open Access type(s): All Open Access, Green

Accession number:20213210747788

Title:High-throughput fast full-color digital pathology based on Fourier ptychographic microscopy via color transfer (Open Access)

Authors:Gao, Yuting (1, 2); Chen, Jiurun (1, 2); Wang, Aiye (1, 2); Pan, An (1); Ma, Caiwen (1); Yao, Baoli (1, 2)

Author affiliation:(1) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding authors:Pan, An(panan@opt.cn); Ma, Caiwen(cwma@opt.ac.cn)

Source title:Science China: Physics, Mechanics and Astronomy

Abbreviated source title:SCI. CHINA Phys. Mech. Astron.

Volume:64

Issue:11

Issue date:November 2021

Publication year:2021

Article number:114211

Language:English

ISSN:16747348

E-ISSN:18691927

Document type:Journal article (JA)

Publisher:Science Press (China)

Abstract:<div data-language="eng" data-ev-field="abstract">The usage of full-color imaging in digital pathology produces significant results. Compared with a grayscale image or a pseudocolor image containing contrast information, a full-color image can identify and detect the target object better with color texture information. Fourier ptychographic microscopy (FPM) is a high-throughput computational imaging technique that breaks the tradeoff between high resolution (HR) and a large field of view. It also eliminates the artifacts of scanning and stitching in digital pathology and improves its imaging efficiency. However, the conventional full-color digital pathology based on FPM is still time-consuming because of the repeated experiments with tri-wavelengths. A color transfer FPM approach termed "CFPM" was reported. The color texture information of a low-resolution full-color pathologic image is directly transferred to the HR grayscale FPM image captured by only a single wavelength. Both of the color space of FPM based on the standard CIE-XYZ color model and the display based on the standard RGB color space were established. Different FPM colorization schemes were analyzed and compared with 30 biological samples. Three types of evaluation approaches were provided, including the root-mean-square error (RMSE), the difference maps, and the image histogram cosine similarity. The average RMSE values of the conventional method and CFPM compared with the ground truth were 5.3% and 5.7%, respectively. Therefore, the reconstruction time is significantly reduced by 2/3 with the sacrifice of precision of only 0.4%. The CFPM method is also compatible with advanced fast FPM approaches to further reduce computation time.<br/></div> © 2021, Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature.

Number of references:46

Main heading:Computational Imaging

Controlled terms:Fourier transforms - Pathology - RGB color model - Textures - Mean square error - Metadata - Object detection

Uncontrolled terms:Color-texture information - Computational imaging - Conventional methods - Digital pathologies - Evaluation approach - Imaging efficiency - Large field of views - Root mean square errors

Numerical data indexing:Percentage 4.00e-01%, Percentage 5.30e+00%, Percentage 5.70e+00%

DOI:10.1007/s11433-021-1730-x

Funding details: Number: 81427802, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:This work was supported by the National Natural Science Foundation of China (Grant No. 81427802). The authors thank Dr. Jila Rafighdoost from Iran for helpful modifications to this manuscript as a native speaker.

Database:Compendex

Open Access type(s): All Open Access, Green

Accession number:20214611141313

Title:Erratum to: High-throughput fast full-color digital pathology based on Fourier ptychographic microscopy via color transfer [Sci. China-Phys. Mech. Astron. 64(11), 114211 (2021)] (Science China Physics, Mechanics & Astronomy, (2021), 64, 11, (114211), 10.1007/s11433-021-1730-x) (Open Access)

Authors:Gao, Yuting (1, 2); Chen, Jiurun (1, 2); Wang, Aiye (1, 2); Pan, An (1); Ma, Caiwen (1); Yao, Baoli (1, 2)

Author affiliation:(1) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding authors:Pan, An(panan@opt.cn); Ma, Caiwen(cwma@opt.ac.cn)

Source title:Science China: Physics, Mechanics and Astronomy

Abbreviated source title:SCI. CHINA Phys. Mech. Astron.

Volume:64

Issue:12

Issue date:December 2021

Publication year:2021

Article number:124251

Language:English

ISSN:16747348

E-ISSN:18691927

Document type:Erratum (ER)

Publisher:Science Press (China)

Abstract:<div data-language="eng" data-ev-field="abstract">In this paper [1], Figure 5(a) is mistakenly used with the figure of ground truth, which is taken and stitched by 10×/ 0.3NA objective and the operations have been detailed in the main text. The correction is as follows (Figure 1). This error does not affect the conclusion of this paper. The authors have also checked other figures such as Figure 6, and they are used correctly.<br/></div> © Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2021.

Number of references:1

DOI:10.1007/s11433-021-1762-8

Database:Compendex

Open Access type(s): All Open Access, Bronze

Accession number:20210609884621

Title:Multi-scale joint network based on Retinex theory for low-light enhancement

Authors:Song, Xijuan (1, 2); Huang, Jijiang (1); Cao, Jianzhong (1); Song, Dawei (1, 2)

Author affiliation:(1) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Huang, Jijiang(huangjijiang@opt.ac.cn)

Source title:Signal, Image and Video Processing

Abbreviated source title:Signal Image Video Process.

Volume:15

Issue:6

Issue date:September 2021

Publication year:2021

Pages:1257-1264

Language:English

ISSN:18631703

E-ISSN:18631711

Document type:Journal article (JA)

Publisher:Springer Science and Business Media Deutschland GmbH

Abstract:<div data-language="eng" data-ev-field="abstract">Due to the limitations of devices, images taken in low-light environments are of low contrast and high noise without any manual intervention. Such images will affect the visual experience and hinder further visual processing tasks, such as target detection and target tracking. To alleviate this issue, we propose a multi-scale joint low-light enhancement network based on the Retinex theory. The network consists of a decomposition part and an enhancement part. As a joint network, the decomposition and enhancement parts are mutually constrained, and the parameters are updated at the same time so that the image processing results are more excellent in detail. Our algorithm avoids the separation and recombination of decomposition and enhancement. Therefore, less information is lost in the processing of low-light images, and the enhancement result of the proposed algorithm is very close to the ground truth. In addition, in the enhancement part, we adopt a multi-scale network to fully extract image features. The multi-scale network maintains a balance between the global and local luminance of the illumination image. Retinex theory can effectively solve the problem of noise amplification and color distortion. At the same time, we have added color loss to solve the problem of color distortion, so that the enhancement result is closer to the normal-light image in color. The enhancement results are intuitively excellent, and the peak signal-to-noise ratio and structural similarity index results also reflect the reliability of the algorithm.<br/></div> © 2021, The Author(s), under exclusive licence to Springer-Verlag London Ltd. part of Springer Nature.

Number of references:33

Main heading:Color

Controlled terms:Image enhancement - Signal to noise ratio - Target tracking

Uncontrolled terms:Color distortions - Illumination images - Manual intervention - Noise amplification - Peak signal to noise ratio - Structural similarity indices - Visual experiences - Visual-processing

Classification code:716.1 Information Theory and Signal Processing - 741.1 Light/Optics

DOI:10.1007/s11760-021-01856-y

Database:Compendex

Accession number:20211910319136

Title:Design of image-side telecentric off-axis three-mirror anastigmatic systems based on the coaxial parent mirrors

Authors:Li, Xijie (1); Zou, Chunbo (1); Yang, Jiating (1)

Author affiliation:(1) Key Laboratory of Spectral Imaging Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China

Corresponding author:Li, Xijie(xijie_li@163.com)

Source title:Optik

Abbreviated source title:Optik

Volume:241

Issue date:September 2021

Publication year:2021

Article number:166855

Language:English

ISSN:00304026

Document type:Journal article (JA)

Publisher:Elsevier GmbH

Abstract:<div data-language="eng" data-ev-field="abstract">Image-side telecentric unobscured optical systems have significant application values in the field of space optics. However, off-axis astigmatism increases with an increase of field of view (FOV), relative aperture and image-side telecentricity, so it's very difficult to design image-side telecentric anastigmatic systems with an ultrawide FOV. To solve these issues, this paper proposes an effective method that is based on the coaxial parent mirrors. By calculating the off-axis aberration optical path of the primary mirror (PM), secondary mirror (SM) and tertiary mirror (TM), and introducing even aspheric surface and adding boundary constraints, a prospective system with a focal length of 400 mm, a relative aperture of 1/3, an FOV of 18° × 6°, and a telecentricity of greater than 0.5°is designed. The design results show that the modulation transfer function (MTF) of the system is greater than 0.7 at the Nyquist frequency of 34 lp/mm, which is close to the diffraction limitation. It has a high imaging quality, thereby proving the image-side telecentric off-axis three-mirror anastigmatic (TMA) system to be effective.<br/></div> © 2021 Elsevier GmbH

Number of references:17

Main heading:Mirrors

Controlled terms:Optical systems - Aberrations

Uncontrolled terms:Anastigmatic system - Anastigmatism design method - Coaxial parent mirror - Field of views - Off-axis - Off-axis anastigmatism balance condition - Optical system designs - Optical- - Telecentricity - Three-mirror anastigmatic systems

Classification code:741.3 Optical Devices and Systems

Numerical data indexing:Size 4.00E-01m

DOI:10.1016/j.ijleo.2021.166855

Database:Compendex

Accession number:20220411511779

Title:Multispectral Images Deblurring via Interchannel Correlation Relationship

Authors:Shi, Yuetian (1); Wang, Nan (1); Yang, Fanchao (1); Zhang, Geng (1); Li, Siyuan (1); Liu, Xuebin (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Key Laboratory of Spectral Imaging Technology CAS, Xi'an, China

Source title:2021 4th International Conference on Information Communication and Signal Processing, ICICSP 2021

Abbreviated source title:Int. Conf. Inf. Commun. Signal Process., ICICSP

Part number:1 of 1

Issue title:2021 4th International Conference on Information Communication and Signal Processing, ICICSP 2021

Issue date:2021

Publication year:2021

Pages:458-462

Language:English

ISBN-13:9781665407571

Document type:Conference article (CA)

Conference name:4th International Conference on Information Communication and Signal Processing, ICICSP 2021

Conference date:September 24, 2021 - September 26, 2021

Conference location:Shanghai, China

Conference code:174853

Sponsor:Science and Technology on Communication Networks Laboratory

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">Image blur is very common in multispectral images, especially out-of-focus blur when the multispectral cameras are well focused on a specific channel. Therefore, it is important to recover the latent clear images from the blurred image. Many researchers have proposed a large number of methods for deblurring multispectral images. These algorithms assume that the relationship between channels is consistent. In fact, the relationship between different channels in multispectral images suffers from different blurring. Therefore it needs different processing for different channels. We propose a joint spatial and spectral filtering algorithm for multispectral images deblurring. We have introduced an adaptive Gaussian distribution as a constraint relationship between channels, which can effectively deblur the multispectral images. Extensive experiments show that our method achieves state-of-the-art results.<br/></div> © 2021 IEEE.

Number of references:18

Main heading:Image enhancement

Controlled terms:Computer vision

Uncontrolled terms:Blurred image - Deblurring - Degraded images - Image blur - Image deblurring - Interchannel correlation relationship - Interchannel correlations - Multispectral cameras - Multispectral images - Out-of-focus blur

Classification code:723.5 Computer Applications - 741.2 Vision

DOI:10.1109/ICICSP54369.2021.9611913

Funding details: Number: -, Acronym: YIPA CAS, Sponsor: Youth Innovation Promotion Association of the Chinese Academy of Sciences;

Funding text:This work was supported by Youth Innovation Promotion Association CAS.

Database:Compendex

Accession number:20220211446994

Title:Adjustment of optical axis consistency of spatial rotation in laser coupling

Authors:Cao, Ming Qiang (1); Li, Xiao Yan (1); Hou, Xiao Hua (1); Zhang, Ge (1); Lei, Yu (1); Fu, Xi Hong (1)

Author affiliation:(1) Xi'An Institute of Optics and Precision Machinery, CAS, No.17, Xinxi Avenue, High-tech Zone, Xi'an City Shaanxi Province, China

Corresponding author:Fu, Xi Hong(fuxh@opt.ac.cn)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12060

Part number:1 of 1

Issue title:AOPC 2021: Advanced Laser Technology and Applications

Issue date:2021

Publication year:2021

Article number:120601U

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510649958

Document type:Conference article (CA)

Conference name:2021 Applied Optics and Photonics China: Advanced Laser Technology and Applications, AOPC 2021

Conference date:June 20, 2021 - June 22, 2021

Conference location:Beijing, China

Conference code:175856

Sponsor:Chinese Society for Optical Engineering

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">The laser transceiver contains a lot of complex optical refractors. The laser signal is emitted from the laser, transmitted through the optical fiber and the transceiver, and entered into the air after multiple splitting, reflection and expansion, so as to exchange information with the outside world. The direction of the laser axis changes with the motion of the two-dimensional turntable. In the process of coupling between the laser fiber and the transceiver, the parallel light generated by the receiving and transmitting collimator should be meet the requirements of consistent divergence angel, parallelism and coincidence at the light outlet of the device. In this paper, the method optical axis consistency detection and adjustment in the process of laser coupling and turntable integration is studied, the device for determining the optical axis reference is designed. By means of precise adjustment, the optical axis and the reference device coincide precisely, and the detection and debugging of optical axis paralleling and coincidence are realized.<br/></div> © 2021 SPIE.

Number of references:6

Main heading:Optical fibers

Controlled terms:Optical transceivers - Light transmission

Uncontrolled terms:Coincidence - Laser coupling - Laser signals - Optical axis - Optical- - Optical-axis consistencies - Parallelism - Reference transmission - Spatial rotation - Splittings

Classification code:716.3 Radio Systems and Equipment - 717.2 Optical Communication Equipment - 741.1 Light/Optics - 741.1.2 Fiber Optics - 741.3 Optical Devices and Systems

DOI:10.1117/12.2607091

Database:Compendex

Accession number:20220111430045

Title:Deep Category-Level and Regularized Hashing with Global Semantic Similarity Learning

Authors:Chen, Yaxiong (1); Lu, Xiaoqiang (1)

Author affiliation:(1) Key Laboratory of Spectral Imaging Technology CAS, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China

Corresponding author:Lu, Xiaoqiang(luxq666666@gmail.com)

Source title:IEEE Transactions on Cybernetics

Abbreviated source title:IEEE Trans. Cybern.

Volume:51

Issue:12

Issue date:December 1, 2021

Publication year:2021

Pages:6240-6252

Language:English

ISSN:21682267

E-ISSN:21682275

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">The hashing technique has been extensively used in large-scale image retrieval applications due to its low storage and fast computing speed. Most existing deep hashing approaches cannot fully consider the global semantic similarity and category-level semantic information, which result in the insufficient utilization of the global semantic similarity for hash codes learning and the semantic information loss of hash codes. To tackle these issues, we propose a novel deep hashing approach with triplet labels, namely, deep category-level and regularized hashing (DCRH), to leverage the global semantic similarity of deep feature and category-level semantic information to enhance the semantic similarity of hash codes. There are four contributions in this article. First, we design a novel global semantic similarity constraint about the deep feature to make the anchor deep feature more similar to the positive deep feature than to the negative deep feature. Second, we leverage label information to enhance category-level semantics of hash codes for hash codes learning. Third, we develop a new triplet construction module to select good image triplets for effective hash functions learning. Finally, we propose a new triplet regularized loss (Reg-L) term, which can force binary-like codes to approximate binary codes and eventually minimize the information loss between binary-like codes and binary codes. Extensive experimental results in three image retrieval benchmark datasets show that the proposed DCRH approach achieves superior performance over other state-of-the-art hashing approaches.<br/></div> © 2013 IEEE.

Number of references:60

Main heading:Semantics

Controlled terms:Hash functions - Image retrieval - Binary codes - Benchmarking - Deep learning

Uncontrolled terms:Category-level semantic - Deep feature similarity - Deep hashing - Hashing techniques - Information loss - Large-scales - Retrieval applications - Semantic similarity - Semantics Information - Similarity learning

Classification code:461.4 Ergonomics and Human Factors Engineering - 723.1 Computer Programming

DOI:10.1109/TCYB.2020.2964993

Database:Compendex

Accession number:20214311059011

Title:A real-time ultra-low light color imaging system based on FPGA (Open Access)

Authors:Hua, Wang (1, 2); He, Bian (2); Lei, Yang (1, 2); Hui, Zhang (1, 2); Zhong, CaoJian (2)

Author affiliation:(1) University of Chinese Academy of Sciences, Beijing; 100049, China; (2) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Shaanxi, Xi’an; 710119, China

Corresponding author:Hua, Wang(wanghua@opt.ac.cn)

Source title:Journal of Physics: Conference Series

Abbreviated source title:J. Phys. Conf. Ser.

Volume:2033

Part number:1 of 1

Issue:1

Issue title:3rd International Conference on Electrical, Communication and Computer Engineering, ICECCE 2021

Issue date:October 5, 2021

Publication year:2021

Article number:012010

Language:English

ISSN:17426588

E-ISSN:17426596

Document type:Conference article (CA)

Conference name:3rd International Conference on Electrical, Communication and Computer Engineering, ICECCE 2021

Conference date:June 12, 2021 - June 13, 2021

Conference location:Kuala Lumpur, Virtual, Malaysia

Conference code:172433

Publisher:IOP Publishing Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">This article shows a low light color image acquisition system, The core components of the system are the Fairchild’s SCMOS image sensor CIS1910F1111 and XILINX’s Artix-7 XC7A100T-2CSG324I FPGA, the remarkable advantage of the system is that it can obtain better color imaging effect under lower illumination environment, and the image noise is much less than other similar products. Based on the excellent imaging performance of the image detector, a high performance real-time low-light level color imaging system is developed. This imaging system can obtain the characteristic information of the targets under ultra-low illuminance environment, including the details, colors and so on. The hardware of the low light level imaging system mainly contains a color SCMOS image sensor and a FPGA, a driving circuit of a combination of DDR3, the ultra-low noise power conversion circuit and a Camera-Link and a 3G-SDI interface circuits. The SCMOS chip is used for photoelectric conversion of the shot scene and the FPGA is used for the control of the whole imaging system, image acquisition and image processing, etc, The FPGA software system consists of SCMOS initialize configuration and timing control module, automatic exposure control module, real-time color image processing module, imaging tone mapping module, image denoising module and image enhancement module. The automatic exposure control (AEC) module adaptively adjusts the average gray value of the region of interest. The module automatically calculates the exposure time and gain value of the next frame according to the current frame image data value. The real-time color image processing module includes color restoration, automatic white balance and color spaces conversion, etc. The image denoising module uses the advanced real-time guide-filter algorithm. The image tone mapping module and enhancement module are proposed based on an improved automatic threshold logarithmic and enhancement algorithm. Combining the hardware and FPGA soft algorithm with excellent performance, the imaging results show that the system can get good color image effect of the ultra-low light level about 10<sup>-2</sup>lx.<br/></div> © 2021 Institute of Physics Publishing. All rights reserved.

Number of references:6

Main heading:Field programmable gate arrays (FPGA)

Controlled terms:Imaging systems - Color image processing - Image denoising - Image segmentation - Mapping - Image acquisition - Image enhancement - Photoelectricity - Color - Exposure controls - Image sensors

Uncontrolled terms:Color images processing - Color imaging - Colour image - Control module - Image Processing Module - Light color - Low light - Mapping modules - Real- time - Ultra-low light

Classification code:405.3 Surveying - 701.1 Electricity: Basic Concepts and Phenomena - 716.1 Information Theory and Signal Processing - 721.2 Logic Elements - 723 Computer Software, Data Handling and Applications - 723.2 Data Processing and Image Processing - 741.1 Light/Optics - 742.1 Photography - 746 Imaging Techniques

DOI:10.1088/1742-6596/2033/1/012010

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20211810282267

Title:Star identification based on multilayer voting algorithm for star sensors (Open Access)

Authors:Liu, Meiying (1, 2); Wei, Xin (1, 2); Wen, Desheng (1); Wang, Hu (1, 2)

Author affiliation:(1) Xi’an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Wei, Xin(weixin@opt.cn)

Source title:Sensors

Abbreviated source title:Sensors

Volume:21

Issue:9

Issue date:May 1, 2021

Publication year:2021

Article number:3084

Language:English

ISSN:14248220

Document type:Journal article (JA)

Publisher:MDPI AG

Abstract:<div data-language="eng" data-ev-field="abstract">This paper describes the multilayer voting algorithm, a novel autonomous star identification method for spacecraft attitude determination. The proposed algorithm includes two processes: an initial match process and a verification process. In the initial match process, a triangle voting scheme is used to acquire candidates of the detected stars, in which the triangle unit is adopted as the basic voting unit. During the identification process, feature extraction is implemented, and each triangle unit is described by its singular values. Then the singular values are used to search for candidates of the imaged triangle units, which further improve the efficiency and robustness of the algorithm. After the initial match step, a verification method is applied to eliminate incorrect candidates from the initial results and then outputting the final match results of the imaged stars. Experiments show that our algorithm has more robustness to position noise, magnitude noise, and false stars than the other three algorithms, the identification speed of our algorithm is largely faster than the geometric voting algorithm and optimized grid algorithm. However, it takes more memory, and SVD also seems faster.<br/></div> © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Number of references:29

Main heading:Stars

Controlled terms:Multilayers - Image enhancement

Uncontrolled terms:Identification process - Singular values - Spacecraft attitude determination - Star identification - Verification method - Verification process - Voting algorithm - Voting schemes

Classification code:657.2 Extraterrestrial Physics and Stellar Phenomena

DOI:10.3390/s21093084

Funding details: Number: 2015AA7046612, Acronym: -, Sponsor: National High-tech Research and Development Program;

Funding text:Funding: This work was supported by the 863 Program, grant number 2015AA7046612.

Database:Compendex

Open Access type(s): All Open Access, Gold, Green

Accession number:20204909586443

Title:Scientific objectives and payloads of Tianwen-1, China's first Mars exploration mission (Open Access)

Authors:Zou, Yongliao (1, 2); Zhu, Yan (1); Bai, Yunfei (1); Wang, Lianguo (1); Jia, Yingzhuo (1); Shen, Weihua (1); Fan, Yu (1); Liu, Yang (1, 2); Wang, Chi (1, 2); Zhang, Aibing (1); Yu, Guobin (3); Dong, Jihong (4); Shu, Rong (5); He, Zhiping (5); Zhang, Tielong (6); Du, Aimin (7); Fan, Mingyi (8); Yang, Jianfeng (9); Zhou, Bin (10); Wang, Yi (11); Peng, Yongqing (12)

Author affiliation:(1) National Space Science Center, Chinese Academy of Sciences, Beijing; 100190, China; (2) State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing; 100190, China; (3) Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu; 610209, China; (4) Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun; 130033, China; (5) Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai; 200083, China; (6) Chinese Academy of Sciences Key Laboratory of Geospace Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei; 230026, China; (7) Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing; 100029, China; (8) China Electronics Technology Group Corporation-38, Hefei; 230088, China; (9) Xi'an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi'an; 710119, China; (10) Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing; 100190, China; (11) Science and Technology on Vacuum Technology and Physics Laboratory, Lanzhou Institute of Physics, Lanzhou; 730000, China; (12) Beijing Research Institute of Telemetry, Beijing; 100076, China

Corresponding author:Zou, Yongliao(zouyongliao@nssc.ac.cn)

Source title:Advances in Space Research

Abbreviated source title:Adv. Space Res.

Volume:67

Issue:2

Issue date:January 15, 2021

Publication year:2021

Pages:812-823

Language:English

ISSN:02731177

E-ISSN:18791948

CODEN:ASRSDW

Document type:Journal article (JA)

Publisher:Elsevier Ltd

Abstract:This paper describes the scientific objectives and payloads of Tianwen-1, China's first exploration mission to Mars. An orbiter, carrying a lander and a rover, lifted-off in July 2020 for a journey to Mars where it should arrive in February 2021. A suite of 13 scientific payloads, for in-situ and remote sensing, autonomously commanded by integrated payload controllers and mounted on the orbiter and the rover will study the magnetosphere and ionosphere of Mars and the relation with the solar wind, the atmosphere, surface and subsurface of the planet, looking at the topography, composition and structure and in particular for subsurface ice. The mission will also investigate Mars climate history. It is expected that Tianwen-1 will contribute significantly to advance our scientific knowledge of Mars.<br/> © 2020 COSPAR

Number of references:8

Main heading:Ionosphere

Controlled terms:Magnetosphere - Martian surface analysis - Remote sensing - Rovers - Topography - Orbits

Uncontrolled terms:Exploration missions - Mars climate - Mars exploration - Payload controllers - Scientific knowledge - Scientific objectives - Scientific payloads

Classification code:443.1 Atmospheric Properties - 655.1 Spacecraft, General - 701.2 Magnetism: Basic Concepts and Phenomena - 951 Materials Science

DOI:10.1016/j.asr.2020.11.005

Funding details: Number: -, Acronym: CNSA, Sponsor: China National Space Administration;Number: 11941001,41590851,42072337, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: D020101,D020102,Z181100002918003,Z191100004319001, Acronym: -, Sponsor: Beijing Municipal Science and Technology Commission;

Funding text:This work is supported by the National Science Foundation of China (Grant No. 41590851, 42072337, 11941001), the Beijing Municipal Science and Technology Commission (Grant No. Z191100004319001, Z181100002918003), and by the Pre-research project on Civil Aerospace Technologies No. D020102 and No. D020101 funded by China National Space Administration (CNSA).

Database:Compendex

Open Access type(s): All Open Access, Hybrid Gold

Accession number:20213610857910

Title:Wideband low-profile dual-polarized dielectric patch antenna with metallic pins

Authors:Cao, Zhi-Xun (1); Zhang, Li (1); Wang, Hao (2); Lu, Hao (1); Liu, Jianfeng (1); Qiu, Yonghui (1)

Author affiliation:(1) National Key Laboratory of Antennas and Microwave Technology, Xidian University, Xi'an, China; (2) Xi'an Institute of Optics and Precision Mechanics, CAS, Xi'an, China

Corresponding author:Wang, Hao(wanghao@opt.ac.cn)

Source title:Microwave and Optical Technology Letters

Abbreviated source title:Microwave Opt Technol Lett

Volume:63

Issue:12

Issue date:December 2021

Publication year:2021

Pages:3079-3085

Language:English

ISSN:08952477

E-ISSN:10982760

CODEN:MOTLEO

Document type:Journal article (JA)

Publisher:John Wiley and Sons Inc

Abstract:<div data-language="eng" data-ev-field="abstract">In this article, a lowprofile dual-polarized dielectric patch antenna (DPA) using TM<inf>101</inf> and TM<inf>121</inf> modes is proposed for achieving the impedance bandwidth (BW) enhancement. By introducing four metallic pins in a dielectric patch resonator (DPR), the TM<inf>121</inf> mode is shifted to low frequencies while TM<inf>101</inf> mode is shifted to high frequencies. Therefore, the two modes can be close to each other for obtaining wide working bandwidth. Moreover, two orthogonal aperture-coupled feeders are employed to excite the proposed DPR to realize the dual polarization. Finally, the proposed antenna is fabricated and measured. The simulated and measured results show that the 10 dB impedance matching bandwidth is 15.2% (5.05–5.87 GHz), while maintaining the low-profile characteristics with the height of 0.07λ<inf>0</inf> (λ<inf>0</inf> is free space wavelength at the center frequency f<inf>0</inf>). In addition, the antenna achieved a peak gain of 8.55 dBi in the operating frequency.<br/></div> © 2021 Wiley Periodicals LLC.

Number of references:22

Main heading:Microstrip antennas

Controlled terms:Dielectric materials - Microwave antennas - Bandwidth - Electric impedance - Slot antennas

Uncontrolled terms:Aperture coupled - Center frequency - Dual-polarizations - Free-space wavelengths - High frequency HF - Impedance bandwidths - Measured results - Operating frequency

Classification code:701.1 Electricity: Basic Concepts and Phenomena - 708.1 Dielectric Materials - 716.1 Information Theory and Signal Processing

Numerical data indexing:Decibel 1.00e+01dB, Decibel_Isotropic 8.55e+00dBi

DOI:10.1002/mop.33036

Funding details: Number: 2020YFA0713900, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Database:Compendex

Accession number:20214511130588

Title:Parallel Multistage Wide Neural Network (Open Access)

Authors:Xi, Jiangbo (1); Ersoy, Okan K. (2); Fang, Jianwu (3); Wu, Tianjun (4); Wei, Xin (5); Zhao, Chaoying (6)

Author affiliation:(1) School of Geology Engineering and Geomatics, Chang'an University, Xi'an 710054, China (e-mail: xijiangbo@chd.edu.cn).; (2) School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907 USA (e-mail: ersoy@purdue.edu).; (3) School of Electronic and Control Engineering, Chang'an University, Xi'an 710064, china.; (4) Department of Mathematics and Information Science, College of Science, Chang'an University, Xi'an 710064, China.; (5) Xi'an Institute of Optics and Precision Mechanics, Xi'an 710072, China.; (6) School of Geology Engineering and Geomatics, Chang'an University, Xi'an 710054, China.

Source title:IEEE Transactions on Neural Networks and Learning Systems

Abbreviated source title:IEEE Trans. Neural Networks Learn. Sys.

Issue date:2021

Publication year:2021

Language:English

ISSN:2162237X

E-ISSN:21622388

Document type:Article in Press

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">Deep learning networks have achieved great success in many areas, such as in large-scale image processing. They usually need large computing resources and time and process easy and hard samples inefficiently in the same way. Another undesirable problem is that the network generally needs to be retrained to learn new incoming data. Efforts have been made to reduce the computing resources and realize incremental learning by adjusting architectures, such as scalable effort classifiers, multi-grained cascade forest (gcForest), conditional deep learning (CDL), tree CNN, decision tree structure with knowledge transfer (ERDK), forest of decision trees with radial basis function (RBF) networks, and knowledge transfer (FDRK). In this article, a parallel multistage wide neural network (PMWNN) is presented. It is composed of multiple stages to classify different parts of data. First, a wide radial basis function (WRBF) network is designed to learn features efficiently in the wide direction. It can work on both vector and image instances and can be trained in one epoch using subsampling and least squares (LS). Second, successive stages of WRBF networks are combined to make up the PMWNN. Each stage focuses on the misclassified samples of the previous stage. It can stop growing at an early stage, and a stage can be added incrementally when new training data are acquired. Finally, the stages of the PMWNN can be tested in parallel, thus speeding up the testing process. To sum up, the proposed PMWNN network has the advantages of: 1) optimized computing resources; 2) incremental learning; and 3) parallel testing with stages. The experimental results with the MNIST data, a number of large hyperspectral remote sensing data, and different types of data in different application areas, including many image and nonimage datasets, show that the WRBF and PMWNN can work well on both image and nonimage data and have very competitive accuracy compared to learning models, such as stacked autoencoders, deep belief nets, support vector machine (SVM), multilayer perceptron (MLP), LeNet-5, RBF network, recently proposed CDL, broad learning, gcForest, ERDK, and FDRK.<br/></div> IEEE

Main heading:Radial basis function networks

Controlled terms:Decision trees - Knowledge management - Remote sensing - Forestry - Large dataset - Image processing - Support vector machines - Functions - Classification (of information) - Deep learning

Uncontrolled terms:Computing resource - Deep learning - Ensemble learning - Incremental learning - Learn+ - Multi-stages - Multistage wide learning - Neural-networks - Parallel testing - Parallel testing.

Classification code:461.4 Ergonomics and Human Factors Engineering - 716.1 Information Theory and Signal Processing - 723 Computer Software, Data Handling and Applications - 723.2 Data Processing and Image Processing - 723.5 Computer Applications - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 903.1 Information Sources and Analysis - 903.3 Information Retrieval and Use - 921 Mathematics - 921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory - 961 Systems Science

DOI:10.1109/TNNLS.2021.3120331

Database:Compendex

Open Access type(s): All Open Access, Bronze, Green

Accession number:20220211444596

Title:Design of solar observation electronics system for space application

Authors:Yao, Pei (1, 2); Zhu, Bo (1); Li, Chuang (1); Wang, Hong (1); Dai, HaoBin (1, 2); Yang, Yang (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China; (2) University of Chinese Academy of Sciences, Beijing, China

Corresponding author:Zhu, Bo(zhubo@opt.ac.cn)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12069

Part number:1 of 1

Issue title:AOPC 2021: Novel Technologies and Instruments for Astronomical Multi-Band Observations

Issue date:2021

Publication year:2021

Article number:120690T

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510650138

Document type:Conference article (CA)

Conference name:2021 Applied Optics and Photonics China: Novel Technologies and Instruments for Astronomical Multi-Band Observations, AOPC 2021

Conference date:June 20, 2021 - June 22, 2021

Conference location:Beijing, China

Conference code:175885

Sponsor:Chinese Society for Optical Engineering

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">Space-based solar observation has severe requirements for resolution, dynamic range, and signal-To-noise ratio of the camera. In order to acquire high-quality solar image data, this paper proposes a high-resolution electronics system based on Gpixel GSENSE6060 image sensor for space-based solar observation. The system uses XILINX XQ5VFX130T as the timing control of the overall system, with DDR SDRAM to cache the image data, which can realize flexible working mode with the windowing mode of the sensor. Firstly, the principle of system parameter selection are given, and the work characteristics of GSENSE6060 are described, then the triggering and termination of event mode are realized by algorithm. The system has high flexibility and reliability, which is suitable for long-Time Full-Disk observation and solar eruptions monitoring. During the flare eruption, a high frame rate acquisition with a resolution of 1024 × 1024 can be realized every 4s for the eruption region, which can be used to acquisition the maximum effective data. Experiments show that the system readout noise is better than 6 e-, in Rolling HDR mode can synthesize 16-bit, resolution of 4608 × 4608 and dynamic range larger than 90dB images, to meet the system design index.<br/></div> © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

Number of references:5

Main heading:Field programmable gate arrays (FPGA)

Controlled terms:Signal to noise ratio - Integrated circuit design - Observatories - Image processing - Space optics

Uncontrolled terms:Array sensors - Digital image - Digital image pre-processing - Electronics system - Image data - Image preprocessing - Large arrays - Large-array sensor - Solar observations - Space-based

Classification code:656.1 Space Flight - 714.2 Semiconductor Devices and Integrated Circuits - 716.1 Information Theory and Signal Processing - 721.2 Logic Elements - 723.2 Data Processing and Image Processing - 741.1 Light/Optics

Numerical data indexing:Decibel 9.00E+01dB, Time 4.00E+00s

DOI:10.1117/12.2606581

Database:Compendex

Accession number:20212510538378

Title:Research on dynamic range analysis and improvement of imaging equipment

Authors:Wang, Hao (1); Huo, Youhui (1); Zhang, Hongbo (2)

Author affiliation:(1) Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China; (2) China Astronaut Research and Training Center, Beijing, China

Corresponding author:Wang, Hao(wanghao@opt.ac.cn)

Source title:ACM International Conference Proceeding Series

Abbreviated source title:ACM Int. Conf. Proc. Ser.

Part number:1 of 1

Issue title:Proceedings of 2021 Workshop on Algorithm and Big Data, WABD 2021

Issue date:March 12, 2021

Publication year:2021

Pages:40-44

Article number:3456392

Language:English

ISBN-13:9781450389945

Document type:Conference article (CA)

Conference name:2021 Workshop on Algorithm and Big Data, WABD 2021

Conference date:March 12, 2021 - March 14, 2021

Conference location:Fuzhou, China

Conference code:169506

Publisher:Association for Computing Machinery

Abstract:<div data-language="eng" data-ev-field="abstract">This paper proposes a dynamic range model and algorithm that analyzes several key factors that affect the dynamic range of imaging equipment. Through this model and algorithm, we analyze several modules that affect the dynamic range of the system, including sensor noise, AD conversion noise, analog gain, digital gain and mapping, and give the quantitative relationships which are used to guide designers to design high performance dynamic range imaging equipment. According to the model and algorithm, a high performance dynamic range imaging equipment can be designed. A hardware extension method based on multi-slope integration is proposed, and the experimental results show that this method is an effective dynamic range expansion method.<br/></div> © 2021 ACM.

Number of references:10

Uncontrolled terms:Dynamic range - Effective dynamics - Hardware extension - Imaging equipment - Model and algorithms - ON dynamics - Performance dynamics - Sensor noise

Classification code:723 Computer Software, Data Handling and Applications

DOI:10.1145/3456389.3456392

Database:Compendex

Accession number:20215011323793

Title:Efficient two-step focal length calibration of space zoom camera without targets

Authors:Wang, Hao (1); Peng, Jianwei (1); Zeng, Hong (2); Zhang, Gaopeng (1); Wang, Feng (1); Liao, Jiawen (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi'an, China; (2) Aerospace Dongfanghong Satellite Co., Ltd., Beijing, China

Corresponding authors:Zhang, Gaopeng(zhanggaopeng@opt.ac.cn); Wang, Feng(Wfeng@opt.ac.cn)

Source title:Optical Engineering

Abbreviated source title:Opt Eng

Volume:60

Issue:11

Issue date:November 1, 2021

Publication year:2021

Article number:114104

Language:English

ISSN:00913286

E-ISSN:15602303

CODEN:OPEGAR

Document type:Journal article (JA)

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">Computer vision plays a key role in measuring the relative posture and position between spacecrafts, especially in various close-range space tasks. As one of the essential steps for computer vision, camera calibration is important for obtaining precise three-dimensional contours of a space target. The focal length of on-orbit zoom cameras constantly changes. Thus, it is practical to calibrate the focal length rather than other intrinsic camera parameters. However, traditional calibration targets, such as checkerboards, cannot be used to calibrate a space camera in orbit. To address this problem, we propose a two-step process for focal length calibration. In the first step, the initial estimate of the camera focal length was generated with vanishing points obtained from the solar panels of satellites. In the second step, the initial solution was optimized by the particle swarm optimization algorithm. The results of the simulations and laboratory experiments confirmed the accuracy, flexibility, and good antinoise interference performance of the proposed method. Thus, the proposed method has practical significance for space tasks, such as space rendezvous-docking and on-orbit maintenance.<br/></div> © 2021 Society of Photo-Optical Instrumentation Engineers (SPIE).

Number of references:23

Main heading:Computer vision

Controlled terms:Particle swarm optimization (PSO) - Calibration - Space rendezvous - Cameras - Orbits

Uncontrolled terms:Camera calibration - Close range - Focal length calibration - Focal lengths - On orbit - Range spaces - Space zoom camera - Three dimensional contour - Vanishing point - Zoom camera

Classification code:656.1 Space Flight - 723 Computer Software, Data Handling and Applications - 723.5 Computer Applications - 741.2 Vision - 742.2 Photographic Equipment - 921.5 Optimization Techniques

DOI:10.1117/1.OE.60.11.114104

Funding details: Number: 51905529, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:This work was supported by the National Natural Science Foundation of China (51905529). The authors are grateful to the anonymous reviewers for their valuable comments. We would like to thank Editage for English language editing. The authors declare that there are no conflicts of interest related to this article.

Database:Compendex

Accession number:20220211444611

Title:Design of deployment systems for high-resolution deployable telescope based on CubeSat

Authors:Dai, Haobin (1, 2); Li, Chuang (1); Li, Liangliang (1, 2); Hu, Bin (1, 2); Yao, Pei (1, 2)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China; (2) University of Chinese Academy of Sciences, Beijing, China

Corresponding author:Li, Chuang(lichuang@opt.ac.cn)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12069

Part number:1 of 1

Issue title:AOPC 2021: Novel Technologies and Instruments for Astronomical Multi-Band Observations

Issue date:2021

Publication year:2021

Article number:1206918

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510650138

Document type:Conference article (CA)

Conference name:2021 Applied Optics and Photonics China: Novel Technologies and Instruments for Astronomical Multi-Band Observations, AOPC 2021

Conference date:June 20, 2021 - June 22, 2021

Conference location:Beijing, China

Conference code:175885

Sponsor:Chinese Society for Optical Engineering

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">In this paper, the deployment systems of a deployable space telescope for CubeSat are proposed. This telescope can achieve a ground resolution less than 1 meter at an orbital altitude of 400 km. Both the primary and secondary mirrors of it can be stowed in 3U volume 1/4 100mm×100mm×300mm during launching period. The functions of the deployment systems include the locking of the primary and secondary mirrors when stowed, the deployment on-orbit, and the active adjustment of the primary mirror segments after deployment. In this paper, firstly, the optical system of deployable telescope is described, then the deployment systems of the telescope are designed. Finally, the modal analysis is carried out using finite element method.<br/></div> © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

Number of references:5

Main heading:Finite element method

Controlled terms:Mirrors - Modal analysis - Optical systems - Locks (fasteners)

Uncontrolled terms:Adjustment - Cubesat - Deployable telescopes - Deployment mechanisms - Ground resolution - High resolution - On orbit - Orbitals - Primary mirrors - Secondary mirror

Classification code:741.3 Optical Devices and Systems - 921 Mathematics - 921.6 Numerical Methods

Numerical data indexing:Size 1.00E-01m, Size 1.00E00m, Size 3.00E-01m, Size 4.00E+05m

DOI:10.1117/12.2606896

Database:Compendex

Accession number:20220211437976

Title:A pupil location algorithm based on cascaded Haar feature and OTSU dynamic threshold segmentation

Authors:Qian, Fanxing (1, 2); Lei, Hao (1, 2)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710071, China; (2) University of Chinese Academy of Science, Beijing; 100049, China

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12065

Part number:1 of 1

Issue title:AOPC 2021: Optical Sensing and Imaging Technology

Issue date:2021

Publication year:2021

Article number:120653I

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510650053

Document type:Conference article (CA)

Conference name:2021 Applied Optics and Photonics China: Optical Sensing and Imaging Technology, AOPC 2021

Conference date:June 20, 2021 - June 22, 2021

Conference location:Beijing, China

Conference code:175876

Sponsor:Chinese Society for Optical Engineering

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">With the development of visual human-computer interaction, non-invasive eye-tracking technology has been applied in medical diagnosis, psychological research, augmented reality and other fields. As a key step of video-based eye tracking technology, pupil detection requires strong robustness, real-time performance and high precision. Although many pupil detection algorithms have been developed, pupil detection is still a challenge when there are so many interference factors such as bright light, reflection, eyelid or eyelash occlusion, or low image resolution. Aim to address the above difficult problems of pupil detection, this paper uses cascaded Haar features and Otsu dynamic threshold segmentation to improve the performance of the existing pupil detection algorithm. The performance of the improved algorithm is verified with the public human eye image dataset from Swirski with high off-axis and severe eyelash occlusion. The results show that the accuracy of the improved algorithm is 86.3% and 89.7% in the error range of 5 pixels and 10 pixels, respectively. The detection algorithm in this paper can provide accurate pupil center coordinates for eye tracking, which lays a foundation for the high-precision calibration and measurement of the following eye tracker.<br/></div> © 2021 SPIE.

Number of references:11

Main heading:Pixels

Controlled terms:Human computer interaction - Signal detection - Augmented reality - Eye tracking - Diagnosis - Feature extraction - Image resolution - Image enhancement - Image segmentation - Edge detection

Uncontrolled terms:Detection algorithm - Dynamic threshold segmentations - Eye tracking technologies - Haar features - Images processing - Improved * algorithm - Performance - Pupil locations - Pupils detection - Sight tracking

Classification code:461.6 Medicine and Pharmacology - 716.1 Information Theory and Signal Processing - 723 Computer Software, Data Handling and Applications

Numerical data indexing:Percentage 8.63E+01%, Percentage 8.97E+01%

DOI:10.1117/12.2607002

Funding details:

Funding text:This work was supported by the Youth Innovation Promotion Foundation of Chinese Academy of Sciences.

Database:Compendex

Accession number:20220211437956

Title:Research on passive ranging technology based on wave front coding

Authors:Mi, Jiao (1, 2); Zhao, Hui (2)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi'an, China; (2) University of Chinese Academy of Science, Beijing, China

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12065

Part number:1 of 1

Issue title:AOPC 2021: Optical Sensing and Imaging Technology

Issue date:2021

Publication year:2021

Article number:120652Y

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510650053

Document type:Conference article (CA)

Conference name:2021 Applied Optics and Photonics China: Optical Sensing and Imaging Technology, AOPC 2021

Conference date:June 20, 2021 - June 22, 2021

Conference location:Beijing, China

Conference code:175876

Sponsor:Chinese Society for Optical Engineering

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">Optical passive ranging is based on the light signal radiated by the object itself. The application of wave front coding technology to passive ranging systems simplifies the system structure and improves the ranging accuracy to a large extent. In this paper, the orthogonal coding passive ranging system with the cosine form of the mask function is investigated, and the optical transfer function and the light intensity distribution at the distances of 1m-4m and 1km-5km are simulated by numerical simulation to verify the rationality of the orthogonal coding ranging system, and the measurement error is about. ±0.1m.<br/></div> © 2021 SPIE.

Number of references:6

Main heading:Wavefronts

Controlled terms:Orthogonal functions - Light - Range finding - Underwater acoustics

Uncontrolled terms:Coding technology - Light signal - Mask function - Optical passive range - Optical- - Orthogonal coding - Passive ranging - Passive ranging system - Technology-based - Wavefront coding

Classification code:741.1 Light/Optics - 751.1 Acoustic Waves - 921 Mathematics

Numerical data indexing:Size 1.00E+03m to 5.00E+03m, Size 1.00E-01m, Size 1.00E00m to 4.00E+00m

DOI:10.1117/12.2606772

Database:Compendex

Accession number:20213110716058

Title:High-accuracy twist measurement based on the spherical wave Talbot effect for a bi-grid modulation collimator

Authors:Liu, Shengrun (1, 2); Xue, Bin (1); Cheng, Ying (1); Yang, Jianfeng (1)

Author affiliation:(1) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xinxi Road, Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Yuquan Road, Beijing; 100049, China

Corresponding author:Liu, Shengrun(liushengrun2015@opt.cn)

Source title:Applied Optics

Abbreviated source title:Appl. Opt.

Volume:60

Issue:22

Issue date:August 1, 2021

Publication year:2021

Pages:6547-6553

Language:English

ISSN:1559128X

E-ISSN:21553165

CODEN:APOPAI

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">The bi-grid modulation collimator is a significant way for imaging solar flares in hard x rays. It implements many subcollimators that consist of separated grid pairs (so-called front grid and rear grid) whose line orientations are parallel. However, when the twist of the front grid with respect to the other will be induced during testing of the bi-grid modulation collimator in the ground verification phase, the line orientation of the grid pairs are no longer parallel. Knowledge of the relative twist between the rear grid and the front grid is very helpful in improving the imaging quality of the bi-grid collimator. However, because of the wide spacing between grid pairs and the requirement of high measurement accuracy, it is a challenge to measure the relative twist. To meet this demand, a method based on the spherical wave Talbot effect is proposed. The Talbot images of the front grid and the rear grid are imaged on the same plane, respectively, through two proper spherical waves. The relative twist can be figured out through the angle between the stripes in the Talbot images of the front grid and the rear grid. In experiments, the measurement accuracy of the relative twist angle can reach 9 arcsec in the range of 370 arcsec. It demonstrates that this method can effectively measure the relative twist between the grid pairs with very high accuracy.<br/></div> © 2021 Optical Society of America

Number of references:28

Main heading:Modulation

Controlled terms:Spheres - Diffraction gratings - Contour measurement

Uncontrolled terms:High-accuracy - Imaging quality - Measurement accuracy - Measurement-based - Modulation collimator - Spherical waves - Talbot effects - Twist angles

Classification code:741.3 Optical Devices and Systems

DOI:10.1364/AO.429980

Funding details: Number: 11941002, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:National Natural Science Foundation of China (11941002).

Database:Compendex

Accession number:20221311871695

Title:Fully Unsupervised Person Re-Identification by Enhancing Cluster Samples

Authors:Chen, Xiumei (1, 2); Zheng, Xiangtao (1); Zhu, Kaijian (3); Lu, Xiaoqiang (1)

Author affiliation:(1) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, Shaanxi, China; (2) University of Chinese Academy of Sciences Beijing, China; (3) State Key Laboratory of Astronautic Dynamics, Xi'an Satellite Control Center, Xi'an, Shaanxi, China

Source title:ACM International Conference Proceeding Series

Abbreviated source title:ACM Int. Conf. Proc. Ser.

Part number:1 of 1

Issue title:2021 7th International Conference on Communication and Information Processing, ICCIP 2021

Issue date:December 16, 2021

Publication year:2021

Pages:70-73

Language:English

ISBN-13:9781450385190

Document type:Conference article (CA)

Conference name:7th International Conference on Communication and Information Processing, ICCIP 2021

Conference date:December 16, 2021 - December 18, 2021

Conference location:Virtual, Online, China

Conference code:177545

Publisher:Association for Computing Machinery

Abstract:<div data-language="eng" data-ev-field="abstract">Fully unsupervised person re-identification aims to train a discriminative model with unlabeled person images. Most existing methods first generate pseudo labels by clustering image features (convolutional features) and then fine-tune the convolutional neural network (CNN) with pseudo labels. However, these methods are greatly limited by the quality of the pseudo labels. In this paper, a cluster sample enhancement method is introduced to increase the reliability of pseudo-label samples to facilitate the CNN training. Specifically, when generating pseudo labels, only the samples with high-confidence pseudo-label predictions are selected. In addition, to enhance the selected samples for training, two different image transformations are adopted and coupled with specific-design loss functions to boost the model performance. Experiments demonstrate the effectiveness of the proposed method. Concretely, the proposed method achieves 87.1% rank-1 and 70.2% mAP accuracy on Market-1501.<br/></div> © 2021 ACM.

Number of references:17

Main heading:Convolutional neural networks

Controlled terms:Convolution - Image enhancement

Uncontrolled terms:Clusterings - Convolutional neural network - Discriminative models - Features extraction - High confidence - Image features - Neural networks trainings - Person re identifications - Sample transformation - Unsupervised person re-identification

Classification code:716.1 Information Theory and Signal Processing

Numerical data indexing:Percentage 1.00E00%, Percentage 7.02E+01%, Percentage 8.71E+01%

DOI:10.1145/3507971.3507984

Database:Compendex

Accession number:20211610220311

Title:A comparison of neural networks algorithms for EEG and sEMG features based gait phases recognition

Authors:Wei, Pengna (1); Zhang, Jinhua (1); Tian, Feifei (2, 3); Hong, Jun (1)

Author affiliation:(1) The Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an, China; (2) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China; (3) University of Chinese Academy of Sciences, Beijing, China

Corresponding author:Zhang, Jinhua(jjshua@mail.xjtu.edu.cn)

Source title:Biomedical Signal Processing and Control

Abbreviated source title:Biomed. Signal Process. Control

Volume:68

Issue date:July 2021

Publication year:2021

Article number:102587

Language:English

ISSN:17468094

E-ISSN:17468108

Document type:Journal article (JA)

Publisher:Elsevier Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">Surface electromyography (sEMG) and electroencephalogram (EEG) can be utilized to discriminate gait phases. However, the classification performance of various combination methods of the features extracted from sEMG and EEG channels for seven gait phase recognition has yet to be discussed. This study investigates the effectiveness of various dimensions of feature sets with different neural network algorithms in multiclass discrimination of gait phases. There are thirty-seven feature sets (slope sign change (SSC) of eight sEMG and twenty-one EEG channels, mean absolute value (MAV) of eight sEMG channels) and three classifiers (Linear Discriminant Analysis (LDA), K-nearest neighbor (KNN), Kernel Support Vector Machine (KSVM)) were utilized. The thirty-seven one-dimensional and six two-dimensional feature sets were applied to LDA and KNN, twenty-one-dimensional and thirty-seven-dimensional feature sets were applied to three optimized KSVM for gait phase recognition. We found that thirty-seven-dimensional feature sets with grid search KSVM achieved the highest classification accuracy (98.56 ± 1.34 %) and the time consumption was 26.37 s. The average time consumption of two-dimensional feature sets with KNN was the shortest (0.33 s). The SSC of sEMG with wider values distributions than others obtained a high performance. This indicates the wider the value distribution of features, the better accuracy of gait recognition. The findings suggest that a multi-dimensional feature set composed of EEG and sEMG features with KSVM achieved good performance. Considering execution time and recognition rate, two-dimensional feature sets with KNN are suitable for online gait recognition, thirty-seven-dimensional feature sets with KSVM are more likely to be used for off-line gait analysis.<br/></div> © 2021 Elsevier Ltd

Number of references:40

Main heading:Electroencephalography

Controlled terms:Pattern recognition - Support vector machines - Nearest neighbor search - Gait analysis - Discriminant analysis

Uncontrolled terms:Electroencephalogram - Feature dimensions - Feature-classifier combination - Features sets - Gait phase recognition - Gait phasis - Gait-phase - Support vectors machine - Surface electromyography

Classification code:461.3 Biomechanics, Bionics and Biomimetics - 461.6 Medicine and Pharmacology - 723 Computer Software, Data Handling and Applications - 903.1 Information Sources and Analysis - 921.5 Optimization Techniques - 922 Statistical Methods

Numerical data indexing:Percentage 9.856E+01%, Time 2.637E+01s, Time 3.30E-01s

DOI:10.1016/j.bspc.2021.102587

Funding details: Number: 61400030701, Acronym: -, Sponsor: -;Number: sxzy022019050, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;

Funding text:This work was supported by the Fundamental Research Funds for the Central Universities [grant numbers sxzy022019050 ] and the Equipment Advance Research Foundation of China [grant numbers 61400030701 ].

Database:Compendex

Accession number:20213410791987

Title:Systematic Research on Measuring Acceleration of Gravity by Laser Interferometry (Open Access)

Authors:Dang, Chun (1); Li, Jing (1); Tang, Jie (2)

Author affiliation:(1) College of Mathematics and Physics, Huaiyin Institute of Technology, Huai'an, China; (2) Xi'An Institute of Optics and Precision Machinery Chinese Academy of Sciences, Xi'an, China

Corresponding author:Dang, Chun(chundang2020@hyit.edu.cn)

Source title:Journal of Physics: Conference Series

Abbreviated source title:J. Phys. Conf. Ser.

Volume:1982

Part number:1 of 1

Issue:1

Issue title:2021 2nd International Conference on Artificial Intelligence and Information Systems, ICAIIS 2021

Issue date:August 2, 2021

Publication year:2021

Article number:012146

Language:English

ISSN:17426588

E-ISSN:17426596

Document type:Conference article (CA)

Conference name:2021 2nd International Conference on Artificial Intelligence and Information Systems, ICAIIS 2021

Conference date:May 28, 2021 - May 30, 2021

Conference location:Chongqing, Virtual, China

Conference code:171060

Publisher:IOP Publishing Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">Gravity acceleration is an important physical quantity, and its precise measurement results have important applications in practice. According to the principle of measuring gravity acceleration in college physics experiment, a scheme of measuring gravity acceleration by laser interferometry is designed, and the main sources and sizes of experimental errors are analyzed and calculated. Compared with the common simple pendulum method and falling body method, the theoretical results show that our measurement method has higher precision and is feasible to accurately measure the acceleration of gravity.<br/></div> © Published under licence by IOP Publishing Ltd.

Number of references:4

Main heading:Laser interferometry

Controlled terms:Acceleration - Gravitation - Interferometers

Uncontrolled terms:Experimental errors - Gravity acceleration - Measurement methods - Physical quantities - Physics experiments - Precise measurements - Simple pendulums - Systematic research

Classification code:741.3 Optical Devices and Systems - 743.2 Holographic Applications - 744.9 Laser Applications - 931.5 Gravitation, Relativity and String Theory - 941.3 Optical Instruments - 941.4 Optical Variables Measurements

DOI:10.1088/1742-6596/1982/1/012146

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20210136429

Title:High-precision time-frequency signal simultaneous transfer system via a WDM-based fiber link

Authors:Qi, Zang (1, 2, 3, 5); Honglei, Quan (1, 2, 3); Kan, Zhao (1); Xiang, Zhang (1, 2, 3); Xue, Deng (1, 2); Wenxiang, Xue (1, 2); Faxi, Chen (4); Tao, Liu (1, 2, 3); Ruifang, Dong (1, 2, 3); Shougang, Zhang (1, 2, 3)

Author affiliation:(1) National Time Service Center, Chinese Academy of Sciences, 3 shuyuandong Road, Xi'an; 710600, China; (2) Key Laboratory of Time and Frequency Primary Standards, Chinese Academy of Sciences, 3 shuyuandong Road, Xi'an; 710600, China; (3) University of Chinese Academy of Sciences, 19 yuquan road, Beijing; 100049, China; (4) Xidian University, 2 taibainan Road, Xi'an; 710071, China; (5) State Key Laboratory of Transient Optics and Photonics, Chinese Academy of Sciences, xinxi Road, Xi'an; 710119, China

Corresponding author:Ruifang, Dong(dongruifang@ntsc.ac.cn)

Source title:arXiv

Abbreviated source title:arXiv

Issue date:June 8, 2021

Publication year:2021

Language:English

E-ISSN:23318422

Document type:Preprint (PP)

Publisher:arXiv

Abstract:<div data-language="eng" data-ev-field="abstract">In this paper, we demonstrate a wavelength division multiplexing (WDM) based system for simultaneously delivering ultrastable optical frequency reference, 10 GHz microwave frequency reference, and one pulse per second (1 PPS) time signal via a 50 km fiber network. For each signal, a unique noise cancellation technique is used to maintain the precision of them. After being compensated, the transfer frequency instability in terms of overlapping Allan deviation (OADEV) for the optical frequency achieves 2×10<sup>-17</sup>/s and scales down to 2×<sup>-10</sup>20/10000 s, which for the 10 GHz microwave reference approaches 4×10<sup>-15</sup>/s and decreases to 1.4×10<sup>-17</sup>/10000 s, and the time uncertainty of the 1 PPS time signal along the system is 2.08 ps. In this scheme, specific channels of WDM are respectively occupied for different signals to avoid the possible crosstalk interference effect between the transmitted reference signals. To estimate the performance of the above scheme, independent of these signals is also demonstrated in this 50 km link, the results are similar to that in the case of simultaneous delivery. This work shows that the WDM-based system is a promising method for building a nationwide time and frequency fiber transfer system with a communication optical network.<br/></div> © 2021, CC BY.

Number of references:40

Main heading:Fibers

Controlled terms:Natural frequencies - Optical fiber communication - Optical materials

Uncontrolled terms:Fiber links - Fiber transfer link - High-precision - Simultaneous transfer - Time and frequency transfers - Time frequency signals - Time signals - Transfer ADEV - Transfer systems - Wavelength division multiplexing networks

Classification code:717.1 Optical Communication Systems - 741.3 Optical Devices and Systems

Numerical data indexing:Frequency 1.00E+10Hz, Size 5.00E+04m, Time 1.00E+04s, Time 2.08E-12s

Database:Compendex

Preprint source website:https://arxiv.org

Preprint ID type:ARXIV

Accession number:20220811682268

Title:The Research of Φ1400mm Sic Mirror for Fabrication, Test and Alignment

Authors:Liangjie, Feng (1); Gangyi, Zou (1); Pengfei, Cheng (1); Renguorui (1); Wei, Wang (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, CAS, China

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12070

Part number:1 of 1

Issue title:10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes

Issue date:2021

Publication year:2021

Article number:120700G

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510650152

Document type:Conference article (CA)

Conference name:10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes 2021

Conference date:June 14, 2021 - June 17, 2021

Conference location:Chengdu, China

Conference code:176905

Sponsor:Institute of Optics and Electronics (IOE), Chinese Academy of Sciences; The Chinese Optical Society (COS)

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">A Φ1400mm silicon carbide(SiC) mirror assembly was designed according to the requirement of the mass and the optical surface distortion. The parameters of the light-weighted open-back primary mirror were optimized by finite element analysis. Six flexure bipods were designed to support the mirror edge in 12 points evenly. 12 floating anti-gravity supports were used to Minimize the optical surface distortion caused by gravity effect to obtain the real optical surface during polishing. The mirror was precisely assembled with the bipods supports and the Carbon fiber reinforcement plastic (CFRP) chamber. The optical test with interferometer showed that the surface distortion was less than 0.03λ(λ=632nm) RMS with ±5℃ temperature variation and 1g gravity condition, and the mass was 145kg, which coincided with the FEA results.<br/></div> © 2021 SPIE

Number of references:10

Main heading:Silicon carbide

Controlled terms:Carbon fiber reinforced plastics - Carbon fibers - Gravitation - Mirrors

Uncontrolled terms:Anti-gravity - Finite element analyse - Flexure support - Light-weighted design - Mirror assembly - Optical surfaces - Primary mirrors - SiC mirrors - Silicon carbide mirror - Surface distortion

Classification code:741.3 Optical Devices and Systems - 804 Chemical Products Generally - 804.2 Inorganic Compounds - 817.1 Polymer Products - 931.5 Gravitation, Relativity and String Theory

Numerical data indexing:Mass 1.00E-03kg, Mass 1.45E+02kg, Size 6.32E-07m

DOI:10.1117/12.2605024

Database:Compendex

Accession number:20214811221866

Title:High-index doped silica glass planar lightwave circuits

Authors:Chu, Sai T. (1); Little, Brent E. (2)

Author affiliation:(1) Department of Physics, City University of Hong Kong, Kowloon Tong, Hong Kong, Hong Kong; (2) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China

Corresponding author:Chu, Sai T.(saitchu@cityu.edu.hk)

Source title:Optics InfoBase Conference Papers

Abbreviated source title:Opt. InfoBase Conf. Pap

Part number:1 of 1

Issue title:Integrated Photonics Research, Silicon and Nanophotonics, IPR 2021

Issue date:2021

Publication year:2021

Article number:ITu4A.2

Language:English

ISBN-13:9781557528209

Document type:Conference article (CA)

Conference name:Integrated Photonics Research, Silicon and Nanophotonics, IPR 2021 - Part of OSA Advanced Photonics Congress 2021

Conference date:July 26, 2021 - July 29, 2021

Conference location:Virtual, Online, United states

Conference code:174141

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">We provide a review of the recent progress of the high-index doped silica glass planar lightwave circuits with a focus on the emerging applications in nonlinear optics and RF photonics.<br/></div> © OSA 2021.

Number of references:16

Main heading:Glass

Controlled terms:Timing circuits - Nonlinear optics - Silica

Uncontrolled terms:Doped silicas - Emerging applications - Higher index - Planar lightwave circuit - Recent progress - RF photonics - Silica-glass

Classification code:713.4 Pulse Circuits - 741.1.1 Nonlinear Optics - 812.3 Glass

Database:Compendex

Accession number:20214611146487

Title:Fusion method of multispectral and panchromatic images based on NSST and improved PCNN

Authors:Song, Chong (1, 2); Zeng, Litang (3); Jiang, Kai (1); Liu, Zhaohui (1); Zhou, Liang (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710000, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) 95972 troops, China

Corresponding authors:Song, Chong(songchong124@163.com); Song, Chong(songchong124@163.com)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11915

Part number:1 of 1

Issue title:International Conference on Optics and Image Processing, ICOIP 2021

Issue date:2021

Publication year:2021

Article number:119150E

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510646957

Document type:Conference article (CA)

Conference name:2021 International Conference on Optics and Image Processing, ICOIP 2021

Conference date:June 4, 2021 - June 6, 2021

Conference location:Guilin, China

Conference code:173231

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">The dual-camera coded aperture snapshot spectral imager(DC-CASSI) includes the coded aperture snapshot spectral imager(CASSI) and panchromatic imager. CASSI can obtain the three-dimensional spectral image information of the target in a single coding within a single integral time, but it is difficult to achieve high-quality reconstruction of spectral image in a single coding. Therefore, the panchromatic image acquired by the panchromatic imager should be fused with it to obtain high-quality multispectral reconstruction images. Based on the imaging characteristics of DC-CASSI, a multispectral and panchromatic image fusion algorithm based on Non-subsampled Shearlets Transform (NSST) and improved Pulse Coupled Neural Network(PCNN) is proposed. The fusion experimental results show that compared with other traditional fusion algorithms, the proposed fusion algorithm can be well applied to DC-CASSI and maximum improving the spatial resolution of multispectral coded image while preserving spectral characteristics of the multispectral coded image.<br/></div> © 2021 SPIE.

Number of references:14

Main heading:Image fusion

Controlled terms:Image coding - Spectroscopy - Image enhancement - Image compression - Image reconstruction - Neural networks

Uncontrolled terms:Coded apertures - Dual cameras - Dual-camera coded aperture snapshot spectral imager - Fusion algorithms - Improved non-subsampled shearlet transform - Multi-spectral - Pulse coupled neural network - Shearlet transforms - Spectral imagers - Spectral images

Classification code:723.2 Data Processing and Image Processing

DOI:10.1117/12.2605896

Database:Compendex

Accession number:20220911705522

Title:Design of the Active Cooling Focal Plane Component for the Space Astronomy Telescope

Authors:Liangjie, Feng (1); Chenjie, Wang (1); Gangyi, Zou (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics of CAS, China

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12075

Part number:1 of 1

Issue title:10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Intelligent Sensing Technologies and Applications

Issue date:2021

Publication year:2021

Article number:1207505

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510650251

Document type:Conference article (CA)

Conference name:10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Intelligent Sensing Technologies and Applications 2021

Conference date:June 14, 2021 - June 17, 2021

Conference location:Chengdu, China

Conference code:176913

Sponsor:Institute of Optics and Electronics, Chinese Academy of Sciences; The Chinese Optical Society (COS)

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">The detecting CCD of a space astronomical telescope needs to be cooled to -75℃ to suppress the dark current for faint target detecting in the universe, and coplanarly spliced with two fine guidance sensor(FGS) which needs to be cooled to -40℃ for the stability as long time observation. Two one stage thermos-electric cooler(TEC) was connected to actively cool the detector to ensure the working temperature and the temperature control accuracy, the Structural of the actively cooling detector assembly and the focal plane component were presented and the power dissipation of the TEC was calculated. In order to ensure the coplanarity of the focal plane component on the working temperature, the finite element method was used to analyze the thermal distribution on the detector surface and the thermal deformation of the supporting structure of the FGS with different materials. The analysis results showed that the lowest cooling temperature of the detecting CCD is -75℃, the temperature control accuracy was better than 1℃, and the coplanar error of the detection CCD and the fine guidance sensors did not exceed 20μm. The thermal equilibrium test showed that the lowest cooling temperature was -74.9℃~-75.1℃ for the detecting CCD, The temperature control accuracy was 0.1℃. The thermal optical test showed that the defocus of the FGS was 4μm after focusing, which verified the thermal and structural design performance of the focal plane component.<br/></div> © 2021 SPIE

Number of references:10

Main heading:Temperature control

Controlled terms:Focusing - Cooling systems - Cooling - Optical design - Structural design

Uncontrolled terms:Active cooling - Active cooling focal plane - Control accuracy - Coplanar splicing - Fine guidance sensors - Focal Plane - Space astronomy - Space astronomy camera - Thermo -optical test - Thermo-optical

Classification code:408.1 Structural Design, General - 641.2 Heat Transfer - 731.3 Specific Variables Control - 741.1 Light/Optics

Numerical data indexing:Size 2.00E-05m, Size 4.00E-06m

DOI:10.1117/12.2605265

Database:Compendex

Accession number:20213810923757

Title:Phase retrieval based on difference map and deep neural networks

Authors:Li, Baopeng (1, 2, 3, 4); Ersoy, Okan K. (4); Ma, Caiwen (1); Pan, Zhibin (2); Wen, Wansha (1, 3); Song, Zongxi (1); Gao, Wei (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China; (2) Faculty of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an, China; (3) University of Chinese Academy of Sciences, Beijing, China; (4) School of Electrical and Computer Engineering, Purdue University, West Lafayette; IN, United States

Corresponding author:Wen, Wansha(wenwansha19@mails.ucas.ac.cn)

Source title:Journal of Modern Optics

Abbreviated source title:J. Mod. Opt.

Volume:68

Issue:20

Issue date:2021

Publication year:2021

Pages:1108-1120

Language:English

ISSN:09500340

E-ISSN:13623044

CODEN:JMOPEW

Document type:Journal article (JA)

Publisher:Taylor and Francis Ltd.

Abstract:<div data-language="eng" data-ev-field="abstract">Phase retrieval occurs in many research areas. There are some classical phase retrieval methods such as hybrid input-output (HIO) and difference map (DM). However, phase retrieval results are sensitive to noise, and the reconstructed images always include artefacts. In this paper, we use the DM algorithm together with DNN to get better phase retrieval results. We train one deep neural network using amplitude images and phase images, respectively. First, using DM, we get initial reconstructed amplitude and phase results. Then, using DNN improves both amplitude and phase results. Finally, using the DM algorithm again improves the DNN results further. The numerical experimental results show that using DM gives better results than HIO, and using DNN improves phase information better than just using DNN to train for amplitude information alone. Compared with only using DNN improves amplitude methods, our method using DM plus DNN plus DM yields a better reconstruction performance for both amplitude and phase.<br/></div> © 2021 Informa UK Limited, trading as Taylor & Francis Group.

Number of references:47

Main heading:Deep neural networks

Controlled terms:Information use

Uncontrolled terms:Amplitude information - Input-output - Numerical experimental - Phase image - Phase information - Phase retrieval - Reconstructed image

Classification code:461.4 Ergonomics and Human Factors Engineering - 903.3 Information Retrieval and Use

DOI:10.1080/09500340.2021.1977860

Funding details: Number: -, Acronym: -, Sponsor: Purdue University;Number: 61906186, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: -, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 1188000111,GFZX04014307, Acronym: YIPA CAS, Sponsor: Youth Innovation Promotion Association of the Chinese Academy of Sciences;Number: 2018YFC0115304, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Funding text:Baopeng Li was supported by the CAS Scholarship for 17 months of study at Purdue University. This work is supported in part by the National Key Research and Development Program of China [grant number 2018YFC0115304]; Youth Innovation Promotion Association of the Chinese Academy of Sciences [grant number 1188000111]; Major Project of High-resolution Earth Observation System of China [grant number GFZX04014307]; National Natural Science Foundation of China [grant number 61906186].

Database:Compendex

Accession number:20211710245631

Title:Attention-Based Multi-Branch Network for Low-Light Image Enhancement

Authors:Jiao, Yin (1, 2); Zheng, Xiangtao (2); Lu, Xiaoqiang (2)

Author affiliation:(1) University of Chinese Academy of Sciences, Beijing, China; (2) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Key Laboratory of Spectral Imaging Technology Cas, Xi'an, China

Source title:2021 IEEE 2nd International Conference on Big Data, Artificial Intelligence and Internet of Things Engineering, ICBAIE 2021

Abbreviated source title:IEEE Int. Conf. Big Data, Artif. Intell. Internet Things Eng., ICBAIE

Part number:1 of 1

Issue title:2021 IEEE 2nd International Conference on Big Data, Artificial Intelligence and Internet of Things Engineering, ICBAIE 2021

Issue date:March 26, 2021

Publication year:2021

Pages:401-407

Article number:9389960

Language:English

ISBN-13:9780738131221

Document type:Conference article (CA)

Conference name:2nd IEEE International Conference on Big Data, Artificial Intelligence and Internet of Things Engineering, ICBAIE 2021

Conference date:March 26, 2021 - March 28, 2021

Conference location:Nanchang, China

Conference code:168280

Sponsor:IEEE

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">Low-light conditions make the obtained images suffer a series of degradation, such as low contrast, noise interference and color distortion. Many previous learning-based methods have made remarkable progress, but they may still produce unsatisfactory results for ignoring noise in low-light regions. An attention-based multi-branch network is proposed, which can adequately enhance the image and suppress latent noise. The proposed method firstly estimates illumination component and reflectance component through a decomposition process. Then the illumination component is brightened to reconstruct the global lighting distribution, and the reflectance component is restored to remove noise and maintain details. A lightweight but effective attention block is employed to guide the restoration of the reflectance component, so as to concentrate on the distribution of lighting in different regions and effectively suppress noise in the dim environment. Extensive experiments on several datasets show the proposed method can achieve good results compared with classic and state-of-the-art methods.<br/></div> © 2021 IEEE.

Number of references:31

Main heading:Image enhancement

Controlled terms:Lighting - Restoration - Reflection

Uncontrolled terms:Decomposition process - Illumination components - Learning-based methods - Lighting distribution - Low light conditions - Noise interference - Reflectance components - State-of-the-art methods

Classification code:723 Computer Software, Data Handling and Applications

DOI:10.1109/ICBAIE52039.2021.9389960

Database:Compendex

Accession number:20210409828985

Title:Observational study of the vertical aerosol and meteorological factor distributions with respect to particulate pollution in Xi'an

Authors:Huige, Di (1); Siwen, Li (1); Yun, Yuan (1); Dengxin, Hua (1); jianyu, Wang (2)

Author affiliation:(1) School of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, Xi'an; 710048, China; (2) Key Laboratory of Active Opto-Electronics Technology, Chinese Academy of Sciences, Shanghai; 200083, China

Corresponding author:Dengxin, Hua(dengxinhua@xaut.edu.cn)

Source title:Atmospheric Environment

Abbreviated source title:Atmos. Environ.

Volume:247

Issue date:February 15, 2021

Publication year:2021

Article number:118215

Language:English

ISSN:13522310

E-ISSN:18732844

CODEN:AENVEQ

Document type:Journal article (JA)

Publisher:Elsevier Ltd

Abstract:To understand the characteristics of atmospheric pollution in Xi'an, China, the vertical structure of aerosols and meteorological data (temperature and relative humidity) during atmospheric pollution processes were obtained and studied. Lidar and radiosonde data were used for analyses of atmospheric pollution. Polarization lidar was used to study the vertical distribution and optical properties of aerosols during haze and dust processes that occurred in 2015–2016. The planetary boundary layer height (PBLH) and types of aerosol particles were retrieved from polarization lidar. A case study shows that a low PBLH and complex vertical distributions of aerosols, temperature and relative humidity (RH) were the main structural characteristics of haze days. The backscatter coefficient exceeded 0.015 km<sup>−1</sup>·Sr<sup>−1</sup>, while the linear particle depolarization ratio was relatively small. A large depolarization ratio above the haze layer, which induces the existence of floating dust, was observed by polarization lidar. Compared with those of haze processes, the vertical aerosol and temperature distributions of dust processes were different. Statistical analyses of the PBLH, temperature inversion, RH and near-surface aerosol concentration were also presented. A lower PBLH, lower average lapse rate of temperature within the PBL, and higher RH were found when haze pollution occurred. An inversion at the top of the boundary layer aggravates ground pollution, while there is not always a temperature inversion when haze occurs in Xi'an. Together, a lower PBLH and lower average lapse rate of temperature weaken the vertical diffusion of pollutants. Decreased vertical diffusion should be the main reason for the formation and persistence of pollution in Xi'an. Increased RH was the catalyst for haze pollution. The aggravation of haze was usually accompanied by an increase in RH, and the decline of haze processes was also accompanied by a decrease or increase (>90%) in RH.<br/> © 2021 Elsevier Ltd

Number of references:30

Main heading:Optical radar

Controlled terms:Atmospheric aerosols - Atmospheric thermodynamics - Atmospheric structure - Air pollution - Optical properties - Boundary layer flow - Depolarization - Atmospheric boundary layer - Dust - Atmospheric humidity - Atmospheric temperature

Uncontrolled terms:Backscatter coefficients - Meteorological factors - Optical properties of aerosols - Planetary boundary layers - Structural characteristics - Temperature and relative humidity - Temperature inversions - Vertical distributions

Classification code:443.1 Atmospheric Properties - 451 Air Pollution - 451.1 Air Pollution Sources - 631.1 Fluid Flow, General - 641.1 Thermodynamics - 716.2 Radar Systems and Equipment - 741.1 Light/Optics - 741.3 Optical Devices and Systems

DOI:10.1016/j.atmosenv.2021.118215

Funding details: Number: 41627807, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 61875163, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:This work was supported by grants from National Natural Science Foundation of China (41627807, 61875163), and Key Laboratory Open Project Fund Chinese academy of sciences (AOE 2017-1).

Database:Compendex

Accession number:20211410165526

Title:Hyperspectral image super-resolution with self-supervised spectral-spatial residual network (Open Access)

Authors:Chen, Wenjing (1, 2); Zheng, Xiangtao (1); Lu, Xiaoqiang (1)

Author affiliation:(1) Key Laboratory of Spectral Imaging Technology CAS, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Zheng, Xiangtao(zhengxiangtao@opt.cn)

Source title:Remote Sensing

Abbreviated source title:Remote Sens.

Volume:13

Issue:7

Issue date:April 1, 2021

Publication year:2021

Article number:1260

Language:English

E-ISSN:20724292

Document type:Journal article (JA)

Publisher:MDPI AG

Abstract:<div data-language="eng" data-ev-field="abstract">Recently, many convolutional networks have been built to fuse a low spatial resolution (LR) hyperspectral image (HSI) and a high spatial resolution (HR) multispectral image (MSI) to obtain HR HSIs. However, most deep learning-based methods are supervised methods, which require sufficient HR HSIs for supervised training. Collecting plenty of HR HSIs is laborious and time-consuming. In this paper, a self-supervised spectral-spatial residual network (SSRN) is proposed to alleviate dependence on a mass of HR HSIs. In SSRN, the fusion of HR MSIs and LR HSIs is considered a pixel-wise spectral mapping problem. Firstly, this paper assumes that the spectral mapping between HR MSIs and HR HSIs can be approximated by the spectral mapping between LR MSIs (derived from HR MSIs) and LR HSIs. Secondly, the spectral mapping between LR MSIs and LR HSIs is explored by SSRN. Finally, a self-supervised fine-tuning strategy is proposed to transfer the learned spectral mapping to generate HR HSIs. SSRN does not require HR HSIs as the supervised information in training. Simulated and real hyperspectral databases are utilized to verify the performance of SSRN.<br/></div> © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Number of references:56

Main heading:Deep learning

Controlled terms:Image fusion - Image resolution - Photomapping - Spectroscopy

Uncontrolled terms:Convolutional networks - High spatial resolution - Image super resolutions - Learning-based methods - Multispectral images - Spatial resolution - Supervised methods - Supervised trainings

Classification code:405.3 Surveying - 461.4 Ergonomics and Human Factors Engineering - 723.2 Data Processing and Image Processing - 742.1 Photography

DOI:10.3390/rs13071260

Funding text:Funding: This work was funded in part by the National Science Fund for Distinguished Young Scholars under grant 61925112, in part by the National Natural Science Foundation of China under grant 61806193 and grant 61772510, in part by the Innovation Capability Support Program of Shaanxi under grant 2020KJXX-091 and grant 2020TD-015, and in part by the Natural Science Basic Research Program of Shaanxi under grants 2019JQ-340 and 2019JC-23.

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20213710897470

Title:Hierarchical Edge Refinement Network for Saliency Detection

Authors:Song, Dawei (1); Dong, Yongsheng (2); Li, Xuelong (2)

Author affiliation:(1) Shaanxi Key Laboratory of Ocean Optics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China; (2) School of Artificial Intelligence, Optics and Electronics (IOPEN), Northwestern Polytechnical University, Xi'an, China

Corresponding author:Song, Dawei(daweisong96@163.com)

Source title:IEEE Transactions on Image Processing

Abbreviated source title:IEEE Trans Image Process

Volume:30

Issue date:2021

Publication year:2021

Pages:7567-7577

Article number:9526284

Language:English

ISSN:10577149

E-ISSN:19410042

CODEN:IIPRE4

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">At present, most saliency detection methods are based on fully convolutional neural networks (FCNs). However, FCNs usually blur the edges of salient objects. Due to that, the multiple convolution and pooling operations of the FCNs will limit the spatial resolution of the feature maps. To alleviate this issue and obtain accurate edges, we propose a hierarchical edge refinement network (HERNet) for accurate saliency detection. In detail, the HERNet is mainly composed of a saliency prediction network and an edge preserving network. Firstly, the saliency prediction network is used to roughly detect the regions of salient objects and is based on a modified U-Net structure. Then, the edge preserving network is used to accurately detect the edges of salient objects, and this network is mainly composed of the atrous spatial pyramid pooling (ASPP) module. Different from the previous indiscriminate supervision strategy, we adopt a new one-to-one hierarchical supervision strategy to supervise the different outputs of the entire network. Experimental results on five traditional benchmark datasets demonstrate that the proposed HERNet performs well when compared with the state-of-the-art methods.<br/></div> © 1992-2012 IEEE.

Number of references:62

Main heading:Convolution

Controlled terms:Object detection - Neural networks

Uncontrolled terms:Benchmark datasets - Edge preserving - Multiple convolution - Saliency detection - Salient objects - Spatial pyramids - Spatial resolution - State-of-the-art methods

Classification code:716.1 Information Theory and Signal Processing - 723.2 Data Processing and Image Processing

DOI:10.1109/TIP.2021.3106798

Funding details: Number: 61871470,62071171,U1801262, Acronym: NNSFC, Sponsor: National Natural Science Foundation of China;Number: QYZDY-SSW-JSC044, Acronym: CAS, Sponsor: Chinese Academy of Sciences;

Funding text:Manuscript received September 19, 2020; revised June 26, 2021; accepted August 6, 2021. Date of publication August 31, 2021; date of current version September 8, 2021. This work was supported in part by the National Natural Science Foundation of China under Grant 61871470, Grant U1801262, and Grant 62071171; and in part by the Key Research Program of Frontier Sciences, Chinese Academy of Sciences, under Grant QYZDY-SSW-JSC044. The associate editor coordinating the review of this manuscript and approving it for publication was Prof. Xiangqian Wu. (Corresponding author: Xuelong Li.) Dawei Song is with the Shaanxi Key Laboratory of Ocean Optics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China, and also with the School of Optoelectronics, University of Chinese Academy of Sciences, Beijing 100049, China (e-mail: daweisong96@163.com).

Database:Compendex

Accession number:20231613903210

Title:Sub-Pixel Scanning High-Resolution Panoramic 3D Imaging Based on a SPAD Array (Open Access)

Authors:Xue, Ruikai (1, 2); Kang, Yan (1); Zhang, Tongyi (1, 2); Li, Lifei (1); Zhao, Wei (1, 2)

Corresponding authors:Kang, Yan(kangyan@opt.ac.cn); Zhang, Tongyi(tyzhang@opt.ac.cn)

Source title:IEEE Photonics Journal

Abbreviated source title:IEEE Photon. J.

Volume:13

Issue:4

Issue date:August 1, 2021

Publication year:2021

Article number:3900106

Language:English

E-ISSN:19430655

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">3D imaging based on single-photon avalanche diode (SPAD) arrays is of interest in many applications. Limited by the small array size and low fill-factor of the available SPAD array, it is difficult for SPAD array-based lidars to achieve high-resolution and high-quality 3D images currently. Here, we propose a sub-pixel continuously scanning panoramic 3D imaging method. This method uses sub-pixel scanning to increase spatial resolution and employs accumulating photon counts at the different pixel of the array for the same target point to improve 3D image quality. We have established an experimental system based on a 32 × 32 SPAD array and a diffraction optical element (DOE) with 32 × 32 beamlet. By sub-pixel scanning for a target 3 m away and accumulating photon counts, we demonstrated that the spatial resolution has been improved from 3 mm to 0.33 mm and the 3D image quality has been improved evidently.<br/></div> © 2021 Institute of Electrical and Electronics Engineers Inc.. All rights reserved.

Number of references:35

Main heading:Optical radar

Controlled terms:Avalanche diodes - Image enhancement - Image quality - Image resolution - Imaging systems - Particle beams - Photons - Pixels

Uncontrolled terms:3-D image - 3D imaging - 3D-images - High resolution - Panoramic imaging - Pixel scanning - Single-photon avalanche diode arrays - Spatial resolution - Sub-pixel scanning - Sub-pixels

Classification code:714.1 Electron Tubes - 716.2 Radar Systems and Equipment - 741.3 Optical Devices and Systems - 746 Imaging Techniques - 931.3 Atomic and Molecular Physics - 932.1 High Energy Physics

Numerical data indexing:Size 3.00E+00m, Size 3.00E-03m to 3.30E-04m

DOI:10.1109/JPHOT.2021.3103817

Funding details: Number: 62001473,62171443, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:Manuscript received June 11, 2021; revised August 3, 2021; accepted August 6, 2021. Date of publication August 10, 2021; date of current version August 27, 2021. This work was supported in part by National Natural Science Foundation of China under Grants 62001473 and 62171443. (Corresponding authors: Yan Kang; Tongyi Zhang) Ruikai Xue is with the State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China, and also with the University of Chinese Academy of Sciences, Beijing 100049, China (e-mail: xueruikai@foxmail.com).

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20212410500799

Title:A Bi<inf>1/2</inf>K<inf>1/2</inf>TiO<inf>3</inf>-based ergodic relaxor ceramic for temperature-stable energy storage applications (Open Access)

Authors:Wei, Yongxing (1); Zhang, Ning (1); Jin, Changqing (1); Shen, Jiahao (1); Xie, Jiahuan (1); Dai, Zhonghua (2); Hu, Lin (1); Zeng, Yiming (3); Jian, Zengyun (1)

Author affiliation:(1) Shaanxi Key Laboratory of Optoelectronic Functional Materials and Devices, School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an; 710021, China; (2) Electronic Materials Research Lab, Key Laboratory of Ministry of Education and International Centre for Dielectric Research, School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an; 710049, China; (3) State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals, Kunming Institute of Precious Metals, Kunming; 650106, China

Corresponding author:Wei, Yongxing(weiyongxing@xatu.edu.cn)

Source title:Materials and Design

Abbreviated source title:Mater. Des.

Volume:207

Issue date:September 2021

Publication year:2021

Article number:109887

Language:English

ISSN:02641275

E-ISSN:18734197

Document type:Journal article (JA)

Publisher:Elsevier Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">Relaxor ferroelectrics are attractive for the high energy storage density. However, the polarization responses of most relaxor ferroelectrics are sensitive to temperature, thus leading to thermal-dependent energy storage properties. In this work, 0.5Bi<inf>1/2</inf>K<inf>1/2</inf>TiO<inf>3</inf>–0.5SrTiO<inf>3</inf> (0.5BKT–0.5ST) and 0.95(0.5Bi<inf>1/2</inf>K<inf>1/2</inf>TiO<inf>3</inf>–0.5SrTiO<inf>3</inf>)–0.05Bi(Zn<inf>1/2</inf>Ti<inf>1/2</inf>)O<inf>3</inf> (BKT–ST–0.05BZT) ceramics were prepared using the solid-state reaction method. Both compositions showed an average cubic structure, with a relaxor-type dielectric anomaly. The rather low remanent polarization and delayed saturated polarization indicated the formation of the ergodic polar nano regions. Benefitting from the Bi(Zn<inf>1/2</inf>Ti<inf>1/2</inf>)O<inf>3</inf> modification, the recoverable energy storage density (W<inf>rec</inf>) reached 3.07 J/cm<sup>3</sup> because of the enhanced polarization and increased bandgap. Meanwhile, BKT–ST–0.05BZT exhibited a high storage efficiency (η > 88%). When the specimen was heated from 30 °C to 150 °C, W<inf>rec</inf> under the maximum electric field E<inf>m</inf> of 150 kV/cm varied from 1.58 to 1.63 J/cm<sup>3</sup> (＜ ±2%).<br/></div> © 2021

Number of references:49

Main heading:Energy storage

Controlled terms:Polarization - Storage (materials) - Storage efficiency - Electric fields - Dielectric materials - Solid state reactions

Uncontrolled terms:Bi1/2K1/2TiO3 - Energy storage dielectric - Ergodic relaxor ceramic - Ergodics - PNR - Relaxor ferroelectric - Relaxors - Temperature stable - Thermal - TiO

Classification code:525.7 Energy Storage - 694.4 Storage - 701.1 Electricity: Basic Concepts and Phenomena - 708.1 Dielectric Materials - 722.1 Data Storage, Equipment and Techniques - 802.2 Chemical Reactions

Numerical data indexing:Electric field strength 1.50E+04V/m, Energy 1.58E+00J to 1.63E+00J, Energy 3.07E+00J, Percentage 2.00E+00%, Percentage 8.80E+01%, Temperature 2.00E+00K, Temperature 3.03E+02K to 4.23E+02K

DOI:10.1016/j.matdes.2021.109887

Funding details: Number: 11704301, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: XAGDXJJ18006,XAGDXJJ200214, Acronym: XJTU, Sponsor: Xi’an Jiaotong University;Number: 2018JQ1092,2019JM414, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;Number: 19JK0398, Acronym: -, Sponsor: Education Department of Shaanxi Province;Number: -, Acronym: XATU, Sponsor: Xi'an Technological University;

Funding text:This work was financially supported by the National Natural Science Foundation of China (Project No. 11704301), the Natural Science Basic Research Plan in Shaanxi Province of China (Program No. 2018JQ1092, 2019JM414), the Shaanxi Provincial Education Department Program (Program No.19JK0398), and the President's Funds of Xi'an Technological University (Project No. XAGDXJJ18006, XAGDXJJ200214).This work was financially supported by the National Natural Science Foundation of China (Project No. 11704301), the Natural Science Basic Research Plan in Shaanxi Province of China (Program No. 2018JQ1092, 2019JM414), the Shaanxi Provincial Education Department Program (Program No.19JK0398), and the President’s Funds of Xi’an Technological University (Project No. XAGDXJJ18006, XAGDXJJ200214).

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20211010019659

Title:Spectral-Spatial Joint Sparse NMF for Hyperspectral Unmixing

Authors:Dong, Le (1, 3); Yuan, Yuan (2, 4); Lu, Xiaoqiang (1)

Author affiliation:(1) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 10119, China; (2) School of Computer Science, Northwestern Polytechnical University, Xi'an; 710072, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China; (4) Center for OPTical IMagery Analysis and Learning (OPTIMAL), Northwestern Polytechnical University, Xi'an; 710072, China

Corresponding author:Lu, Xiaoqiang(luxq666666@gmail.com)

Source title:IEEE Transactions on Geoscience and Remote Sensing

Abbreviated source title:IEEE Trans Geosci Remote Sens

Volume:59

Issue:3

Issue date:March 2021

Publication year:2021

Pages:2391-2402

Article number:9141345

Language:English

ISSN:01962892

E-ISSN:15580644

CODEN:IGRSD2

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:The nonnegative matrix factorization (NMF) combining with spatial-spectral contextual information is an important technique for extracting endmembers and abundances of hyperspectral image (HSI). Most methods constrain unmixing by the local spatial position relationship of pixels or search spectral correlation globally by treating pixels as an independent point in HSI. Unfortunately, they ignore the complex distribution of substance and rich contextual information, which makes them effective in limited cases. In this article, we propose a novel unmixing method via two types of self-similarity to constrain sparse NMF. First, we explore the spatial similarity patch structure of data on the whole image to construct the spatial global self-similarity group between pixels. And according to the regional continuity of the feature distribution, the spectral local self-similarity group of pixels is created inside the superpixel. Then based on the sparse expression of the pixel in the subspace, we sparsely encode the pixels in the same spatial group and spectral group respectively. Finally, the abundance of pixels within each group is forced to be similar to constrain the NMF unmixing framework. Experiments on synthetic and real data fully demonstrate the superiority of our method over other existing methods.<br/> © 1980-2012 IEEE.

Number of references:60

Main heading:Pixels

Controlled terms:Matrix factorization - Matrix algebra - Spectroscopy

Uncontrolled terms:Contextual information - Feature distribution - Hyperspectral unmixing - Local selfsimilarity - Nonnegative matrix factorization - Spatial similarity - Spectral correlation - Synthetic and real data

Classification code:921 Mathematics - 921.1 Algebra

DOI:10.1109/TGRS.2020.3006109

Funding details: Number: 2017YFB0502900, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;Number: 61825603, Acronym: -, Sponsor: National Science Fund for Distinguished Young Scholars;Number: QYZDB-SSW-JSC015, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: XAB2017B15, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 61702498,61772510, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:Manuscript received March 4, 2020; revised May 8, 2020; accepted May 31, 2020. Date of publication July 15, 2020; date of current version February 25, 2021. This work was supported in part by the National Natural Science Foundation of China under Grant 61772510 and Grant 61702498, in part by the National Natural Science Foundation for Distinguished Young Scholars under Grant 61825603, in part by the Young Top-Notch Talent Program of the Chinese Academy of Sciences under Grant QYZDB-SSW-JSC015, in part by the National Key Research and Development Program of China under Grant 2017YFB0502900, and in part by the CAS Light of West China Program under Grant XAB2017B15. (Corresponding author: Xiaoqiang Lu.) Le Dong is with the Key Laboratory of Spectral Imaging Technology CAS, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China, and also with the University of Chinese Academy of Sciences, Beijing 100049, China.

Database:Compendex

Accession number:20210809951158

Title:Extended field of view of light-sheet fluorescence microscopy by scanning multiple focus-shifted Gaussian beam arrays (Open Access)

Authors:Liu, Chao (1, 2); Bai, Chen (1); Yu, Xianghua (1); Yan, Shaohui (1); Zhou, Yuan (1, 2); Li, Xing (1, 2); Min, Junwei (1); Yang, Yanlong (1); Dan, Dan (1); Yao, Baoli (1, 2)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and PrecisionMechanics, Chinese Academy of Sciences, Xi’an, Shaanxi; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Source title:Optics Express

Abbreviated source title:Opt. Express

Volume:29

Issue:4

Issue date:February 15, 2021

Publication year:2021

Pages:6158-6168

Language:English

E-ISSN:10944087

Document type:Journal article (JA)

Publisher:OSA - The Optical Society

Abstract:Light-sheet fluorescence microscopy (LSFM) facilitates high temporal-spatial resolution, low photobleaching and phototoxicity for long-term volumetric imaging. However, when a high axial resolution or optical sectioning capability is required, the field of view (FOV) is limited. Here, we propose to generate a large FOV of light-sheet by scanning multiple focus-shifted Gaussian beam arrays (MGBA) while keeping the high axial resolution. The positions of the beam waists of the multiple Gaussian beam arrays are shifted in both axial and lateral directions in an optimized arranged pattern, and then scanned along the direction perpendicular to the propagation axis to form an extended FOV of light-sheet. Complementary beam subtraction method is also adopted to further improve axial resolution. Compared with the single Gaussian light-sheet method, the proposed method extends the FOV from 12 µm to 200 µm while sustaining the axial resolution of 0.73 µm. Both numerical simulation and experiment on samples are performed to verify the effectiveness of the method.<br/> © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Number of references:31

Main heading:Gaussian beams

Controlled terms:Gaussian distribution - Photobleaching - Fluorescence - Fluorescence microscopy - Numerical methods

Uncontrolled terms:Axial resolutions - Extended field of views - Lateral directions - Optical sectioning - Propagation axis - Spatial resolution - Subtraction method - Volumetric Imaging

Classification code:711 Electromagnetic Waves - 741.1 Light/Optics - 801 Chemistry - 921.6 Numerical Methods - 922.1 Probability Theory - 922.2 Mathematical Statistics - 931.4 Quantum Theory; Quantum Mechanics - 941.3 Optical Instruments

DOI:10.1364/OE.418707

Funding details: Number: 11704405,61905277,61975233,81427802, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2020GY-008,2020SF-193, Acronym: -, Sponsor: Key Research and Development Projects of Shaanxi Province;

Funding text:Funding. National Natural Science Foundation of China (11704405, 61905277, 61975233, 81427802); Key Research and Development Projects of Shaanxi Province (2020GY-008, 2020SF-193).

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20210318988

Title:One-dimensional purely Lee-Huang-Yang fluids dominated by quantum fluctuations in two-component Bose-Einstein condensates

Authors:Liu, Xiuye (1, 2); Zeng, Jianhua (1, 2)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Zeng, Jianhua(zengjh@opt.ac.cn)

Source title:arXiv

Abbreviated source title:arXiv

Issue date:September 12, 2021

Publication year:2021

Language:English

E-ISSN:23318422

Document type:Preprint (PP)

Publisher:arXiv

Abstract:<div data-language="eng" data-ev-field="abstract">Lee-Huang-Yang (LHY) fluids are an exotic quantum matter dominated purely by quantum fluctuations. Recently, the three-dimensional LHY fluids were observed in ultracold atoms experiments, while their low-dimensional counterparts have not been well known. Herein, based on the Gross-Pitaevskii equation of one-dimensional LHY quantum fluids in two-component Bose-Einstein condensates, we reveal analytically and numerically the formation, properties, and dynamics of matter-wave structures therein. Considering a harmonic trap, approximate analytical results are obtained based on variational approximation, and higher-order nonlinear localized modes with nonzero nodes are constructed numerically. Stability regions of all the LHY nonlinear localized modes are identified by linear-stability analysis and direct perturbed numerical simulations. Movements and oscillations of single localized mode, and collisions between two modes, under the influence of different initial kicks are also studied in dynamical evolutions. The predicted results are available to quantum-gas experiments, providing a new insight into LHY physics in low-dimensional settings.<br/></div> Copyright © 2021, The Authors. All rights reserved.

Number of references:51

Main heading:Linear stability analysis

Controlled terms:Bose-Einstein condensation - Quantum chemistry - Statistical mechanics

Uncontrolled terms:Bose-Einstein condensates - Cold atoms - Lee-huang-yang fluid - Low dimensional - Nonlinear localized modes - One-dimensional - Quantum fluctuation - Quantum matter - Two-component - Ultracold atoms

Classification code:801.4 Physical Chemistry - 921 Mathematics - 922.2 Mathematical Statistics - 931.1 Mechanics - 931.2 Physical Properties of Gases, Liquids and Solids - 931.3 Atomic and Molecular Physics

DOI:10.48550/arXiv.2109.05515

Database:Compendex

Preprint source website:https://arxiv.org

Preprint ID type:ARXIV

Accession number:20214811229280

Title:The phase uncertainty from the fringe contrast of interferogram in Doppler asymmetric spatial heterodyne spectroscopy (Open Access)

Authors:Sun, Chen (1, 2); Feng, Yutao (2); Fu, Di (1, 2); Wang, Pengchong (2); Sun, Jian (2); Bai, Qinglan (2)

Author affiliation:(1) University of Chinese Academy of Sciences, Beijing, China; (2) Key Laboratory of Spectral Imaging Technology of Chinese Academy of Sciences, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China

Corresponding author:Feng, Yutao(fytciom@opt.ac.cn)

Source title:Journal of Optics (United Kingdom)

Abbreviated source title:J. Opt.

Volume:23

Issue:11

Issue date:November 2021

Publication year:2021

Article number:115703

Language:English

ISSN:20408978

E-ISSN:20408986

Document type:Journal article (JA)

Publisher:IOP Publishing Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">The Doppler asymmetric spatial heterodyne spectroscopy is one of the primary techniques for measuring the upper atmospheric wind profile. In this work, the detailed derivation of the analytical expression of phase uncertainty was presented, including two significant parameters, fringe contrast and signal-to-noise ratio. The effectiveness of the re-parameterized analytical expression was proved using the numerical simulations and laboratory experiments, and both results are in good agreement with them from the analytical expression. Therefore, the re-parameterized analytical expression could be used to optimize the interferometer design and evaluating the instrument performance.<br/></div> © 2021 The Author(s).

Number of references:43

Main heading:Interferometers

Controlled terms:Signal to noise ratio - Heterodyning

Uncontrolled terms:Analytical expressions - Atmospheric Winds - Doppler - Fringe contrasts - Fringe signals - Interferograms - Parameterized - Phase uncertainties - Spatial heterodyne spectroscopies - Wind profiles

Classification code:716.1 Information Theory and Signal Processing - 941.3 Optical Instruments

DOI:10.1088/2040-8986/ac2462

Funding details: Number: -, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 41005019,XAB 2016A07, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: -, Acronym: -, Sponsor: West Light Foundation of the Chinese Academy of Sciences;Number: 2019JQ-931, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;

Funding text:This work was supported by the National Natural Science Foundation of China (Grant No. 41005019), West Light Foundation of Chinese Academy of Sciences (Grant No. XAB 2016A07), Natural Science Basic Research Program of Shaanxi Province (Grant No. 2019JQ-931), West Light Cross- Disciplinary Innovation team of Chinese Academy of Sciences (Grant No. E1294301). This paper is to cherish the memory of Dr Chen Sun, who was involved in most of the work in this study. The research team would like to express the highest recognition and gratitude to Dr Chen Sun for his hard work. Recalling the past, we will always remember.Original content from this work may be used under the terms of the . Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. West Light Cross-Disciplinary Innovation team of Chinese Academy of Sciences E1294301 West Light Foundation of Chinese Academy of Sciences XAB 2016A07 Natural Science Basic Research Program of Shaanxi Province 2019JQ-931 National Natural Science Foundation of China http://dx.doi.org/10.13039/501100001809 41005019 yes � 2021 The Author(s). Published by IOP Publishing Ltd Creative Commons Attribution 4.0 license

Database:Compendex

Open Access type(s): All Open Access, Hybrid Gold

Accession number:20214311059180

Title:FPGA applied in hardware computer aided design of gigabit ethernet data acquisition system (Open Access)

Authors:Hua, Wang (1); He, Bian (1); Hao, Wang (1); Lei, Yang (1)

Author affiliation:(1) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China

Corresponding author:He, Bian(bianhe@opt.ac.cn)

Source title:Journal of Physics: Conference Series

Abbreviated source title:J. Phys. Conf. Ser.

Volume:2033

Part number:1 of 1

Issue:1

Issue title:3rd International Conference on Electrical, Communication and Computer Engineering, ICECCE 2021

Issue date:October 5, 2021

Publication year:2021

Article number:012079

Language:English

ISSN:17426588

E-ISSN:17426596

Document type:Conference article (CA)

Conference name:3rd International Conference on Electrical, Communication and Computer Engineering, ICECCE 2021

Conference date:June 12, 2021 - June 13, 2021

Conference location:Kuala Lumpur, Virtual, Malaysia

Conference code:172433

Publisher:IOP Publishing Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">With the increasing popularity of the network, Ethernet has been widely used because of its wide distribution and convenient access. At the same time, due to the continuous innovation of Ethernet technology and the continuous development of new functions, it has gradually become the most popular network technology in the world. Gigabit Ethernet is a technology based on the Ethernet standard, and has become the mainstream because of its high efficiency, high speed and high performance Network technology. This paper presents a hardware design scheme of Gigabit Ethernet data acquisition system based on FPGA, including power module, clock module, FPGA main controller module, 88e1111 Ethernet module, which realizes data acquisition and transmission. The system is miniaturized, low-cost and portable.<br/></div> © 2021 Institute of Physics Publishing. All rights reserved.

Number of references:5

Main heading:Data acquisition

Controlled terms:Ethernet - Costs - Computer aided design - Computer hardware - Field programmable gate arrays (FPGA) - Integrated circuit design

Uncontrolled terms:Computer-aided design - Continuous development - Continuous innovation - Data acquisition system - Ethernet technology - Gigabit Ethernet - Low-costs - Miniaturisation - Network technologies - New functions

Classification code:714.2 Semiconductor Devices and Integrated Circuits - 721.2 Logic Elements - 722 Computer Systems and Equipment - 722.3 Data Communication, Equipment and Techniques - 723.2 Data Processing and Image Processing - 723.5 Computer Applications - 911 Cost and Value Engineering; Industrial Economics

DOI:10.1088/1742-6596/2033/1/012079

Database:Compendex

Open Access type(s): All Open Access, Bronze

Accession number:20231213755644

Title:Using cnn and hht to predict blood pressure level based on photoplethysmography and its derivatives (Open Access)

Authors:Sun, Xiaoxiao (1, 2); Zhou, Liang (1); Chang, Shendong (3); Liu, Zhaohui (1)

Author affiliation:(1) Xi’an Institute of Optics and Precision Mechanics of CAS, Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) EAIT (Engineering, Architecture and Information Technology Department), University of Queensland, Brisbane; 4072, Australia

Corresponding author:Zhou, Liang(zhouliang@opt.ac.cn)

Source title:Biosensors

Abbreviated source title:Biosensors

Volume:11

Issue:4

Issue date:2021

Publication year:2021

Article number:120

Language:English

E-ISSN:20796374

CODEN:BISSED

Document type:Journal article (JA)

Publisher:MDPI

Abstract:<div data-language="eng" data-ev-field="abstract">According to the WTO, there were 1.13 billion hypertension patients worldwide in 2015. The WTO encouraged people to check the blood pressure regularly because a large amount of patients do not have any symptoms. However, traditional cuff measurement results are not enough to represent the patient0s blood pressure status over a period of time. Therefore, there is an urgent need for portable, easy to operate, continuous measurement, and low-cost blood pressure measuring devices. In this paper, we adopted the convolutional neural network (CNN), based on the Hilbert–Huang Transform (HHT) method, to predict blood pressure (BP) risk level using photoplethysmography (PPG). Considering that the PPG0s first and second derivative signals are related to atherosclerosis and vascular elasticity, we created a dataset called PPG+, the images of PPG+ carry information on PPG and its derivatives. We built three classification experiments by collecting 582 data records (the length of each record is 10 s) from the Medical Information Mart for Intensive Care (MIMIC) database: NT (normotension) vs. HT (hypertension), NT vs. PHT (prehypertension), and (NT + PHT) vs. HT, the F1 scores of the PPG + experiments using AlexNet were 98.90%, 85.80%, and 93.54%, respectively. We found that, first, the dataset established by the HHT method performed well in the BP grade prediction experiment. Second, because the Hilbert spectra of the PPG are simple and periodic, AlexNet, which has only 8 layers, got better results. More layers instead increased the cost and difficulty of training.<br/></div> © 2021 by the authors.

Number of references:32

Main heading:Empirical mode decomposition

Controlled terms:Blood - Blood pressure - Classification (of information) - Convolution - Convolutional neural networks - Forecasting - International trade - Photoplethysmography

Uncontrolled terms:Continuous measurements - Convolutional neural network - Derivative of photoplethysmography - Empirical Mode Decomposition - Ensemble empirical mode decomposition - Hilbert Huang transforms - Large amounts - Normotension - Pressure level - Transform methods

Classification code:461.2 Biological Materials and Tissue Engineering - 461.6 Medicine and Pharmacology - 461.9 Biology - 716.1 Information Theory and Signal Processing - 903.1 Information Sources and Analysis

Numerical data indexing:Percentage 9.89E+01%, Time 1.00E+01s, Percentage 8.58E+01%, Percentage 9.354E+01%

DOI:10.3390/bios11040120

Funding details: Number: 61805275, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:Funding: This research was funded by the National Natural Science Foundation of China, grant number 61805275.

Database:Compendex

Open Access type(s): All Open Access, Gold, Green

Accession number:20215211375462

Title:Compact portable laser system for transportable communication band ultra-narrow linewidth laser

Authors:Zhang, Linbo (1, 2); Jiao, Dongdong (1); Guo, Xinqian (1); Fan, Le (1); Xu, Guanjun (1); Liu, Tao (1); Zhang, Shougang (1)

Author affiliation:(1) National Time Service Center, Chinese Academy of Sciences, Xi'An, China; (2) State Key Laboratory of Transient Optics and Photonics, Chinese Academy of Sciences, Xi'An, China

Corresponding authors:Zhang, Linbo(linbo@ntsc.ac.cn); Liu, Tao(taoliu@ntsc.ac.cn)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:12057

Part number:1 of 1

Issue title:Twelfth International Conference on Information Optics and Photonics, CIOP 2021

Issue date:2021

Publication year:2021

Article number:1205703

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510649897

Document type:Conference article (CA)

Conference name:12th International Conference on Information Optics and Photonics, CIOP 2021

Conference date:July 23, 2021 - July 26, 2021

Conference location:Xi'an, China

Conference code:175384

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">Ultra-narrow linewidth laser plays a very important role in the high-precision optical frequency transfer via optical fibers. We have designed and realized a compact portable laser system for transportable communication band ultra-narrow linewidth laser. Based on the method of topology optimization design, a stable optical board is developed. Designed and developed a series of small optical grade devices without exercise rules, making the optical system more stable. The optical system we designed is suitable for transportable ultra-narrow linewidth laser.<br/></div> © 2021 COPYRIGHT SPIE.

Number of references:6

Main heading:Optical systems

Controlled terms:Linewidth - Optical fibers - Natural frequencies - Optical materials

Uncontrolled terms:Communication bands - Frequency transfer - High-precision - Laser systems - Mode matching - Narrow linewidth lasers - Optical frequency - Topology optimisation - Ultra-narrow linewidth laser - Ultra-narrow linewidths

Classification code:741.1.2 Fiber Optics - 741.3 Optical Devices and Systems - 931.3 Atomic and Molecular Physics - 931.4 Quantum Theory; Quantum Mechanics

DOI:10.1117/12.2603696

Funding details: Number: SKLST201909, Acronym: -, Sponsor: -;

Funding text:This work was supported by the Major Scientific Instruments and National Development Funding Projects of China (grant no. 61127901). The project was supported by the Open Research Fund of State Key Laboratory of Transient Optics and Photonics (SKLST201909).

Database:Compendex

Accession number:20214411086123

Title:Comprehensive Evaluation Method of Job Satisfaction Based on Improved Analytic Hierarchy Process (Open Access)

Authors:Dai, Nanru (1); Deng, Ren (1); Tang, Siyi (1); Zhang, Shanshan (1); Li, Xijie (2)

Author affiliation:(1) BASIS International School, China; (2) Xi'An Institute of Optics and Precision Mechanics of CAS, China

Source title:ACM International Conference Proceeding Series

Abbreviated source title:ACM Int. Conf. Proc. Ser.

Part number:1 of 1

Issue title:ICCMS 2021 - Proceedings of the 13th International Conference on Computer Modeling and Simulation

Issue date:June 25, 2021

Publication year:2021

Pages:140-147

Language:English

ISBN-13:9781450389792

Document type:Conference article (CA)

Conference name:13th International Conference on Computer Modeling and Simulation, ICCMS 2021

Conference date:June 25, 2021 - June 27, 2021

Conference location:Virtual, Online, Australia

Conference code:172560

Publisher:Association for Computing Machinery

Abstract:<div data-language="eng" data-ev-field="abstract">Summer jobs have become an increasingly popular topic among high school students these days. They provide invaluable enrichment opportunities to make money and gain experience and skills. However, due to the outbreak of coronavirus, it is more challenging for high school students to identify the most appropriate summer jobs for them. We first identify related variables and collect data useful to our model. We consider 22 different summer jobs and consider variables including income, company size, risks, comfort, and skills to be gained. For the overall model, we adopt an Analytic Hierarchy Process to evaluate the weights or relative importance of each variable for each individual. Combining the weights we calculate from both models, we then obtain the overall weighting used for each individual. However, considering students usually want to have an array of open options to choose from, we utilize K-Means clustering rather than simply returning the one single "best"job. Then, the best cluster of job options is output to our user. In regards to the fictional characters, we develop 10 different characters that we believe are highly representative of the US high school student population. Application of our developed model onto these fictional characters indicates that our model is fairly effective in identifying the most appropriate summer jobs for students.<br/></div> © 2021 ACM.

Number of references:18

Main heading:Analytic hierarchy process

Controlled terms:Job satisfaction - K-means clustering - Students

Uncontrolled terms:Company size - Comprehensive evaluation - Coronaviruses - Entropy weight method - Evaluation methods - High school students - Improved analytic hierarchy process - K-means++ clustering - Overall-model - Related variables

Classification code:903.1 Information Sources and Analysis - 912.4 Personnel - 961 Systems Science

DOI:10.1145/3474963.3474983

Database:Compendex

Open Access type(s): All Open Access, Bronze

Accession number:20213910941912

Title:UAV-borne Biomimetic Curved Compound-eye Imaging System for Velocity Measurement

Title of translation:无人机载型曲面仿生复眼成像测速系统

Authors:Xu, Huangrong (1, 2); Liu, Jinheng (1, 2); Zhang, Yuanjie (1, 2); Wu, Dengshan (1); Fan, Hao (1, 2); Feng, Xiangpeng (1); Zhang, Geng (1, 2); Hu, Bingliang (1, 2); Yu, Weixing (1, 2)

Author affiliation:(1) Key Laboratory of Spectral Imaging Technology of Chinese Academy of Sciences, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710072, China; (2) University of Chinese Academy of Science, Beijing; 100049, China

Source title:Guangzi Xuebao/Acta Photonica Sinica

Abbreviated source title:Guangzi Xuebao

Volume:50

Issue:9

Issue date:September 25, 2021

Publication year:2021

Pages:224-230

Language:Chinese

ISSN:10044213

CODEN:GUXUED

Document type:Journal article (JA)

Publisher:Chinese Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">Based on the visual advantages of the biomimetic compound eye, the biomimetic curved compound-eye is applied to the unmanned aerial vehicle-borne photoelectric detection system to realize the airborne wide field-of-view and high-resolution detection of moving objects purposes. According to the characteristics of the biological compound eye, a lens array arranged on the curved surface in a hexagon is designed as compound-eye lens, combined with an optical relay subsystem and a CMOS image sensor to form a biomimetic curved compound-eye imaging and velocity measurement system. The developed biomimetic curved compound-eye imaging system has a field of view of 98°×98°, a system focal length of 5 mm, an angular resolution of 1.8 mrad and an F-number of 3.5. The size of the system is Ф123 mm ×195 mm, and the weight is 1.35 kg. According to the imaging principle of the biomimetic compound-eye and by taking advantage of the overlapping field of views between adjacent ommatidia, the velocity measurement principle of the biomimetic curved compound-eye is proposed. The velocity measurement experiment of a moving car shows that the velocity measurement method can effectively improve the test reliability and accuracy of the moving target.<br/></div> © 2021, Science Press. All right reserved.

Number of references:15

Main heading:Unmanned aerial vehicles (UAV)

Controlled terms:Imaging systems - Velocity - Object detection - Antennas - Lenses - Velocity measurement - Biomimetics

Uncontrolled terms:Biomimetic compound-eye - Biomimetic compounds - Compound eye - Field of views - Large field of views - Photoelectric detection systems - UAV-borne - Vehicle-borne - Velocity measurement system - Wide field-ofview

Classification code:461.8 Biotechnology - 461.9 Biology - 652.1 Aircraft, General - 723.2 Data Processing and Image Processing - 741.3 Optical Devices and Systems - 746 Imaging Techniques - 943.3 Special Purpose Instruments

Numerical data indexing:Absorbed dose 1.80E-05Gy, Mass 1.35E+00kg, Size 1.95E-01m, Size 5.00E-03m

DOI:10.3788/gzxb20215009.0911004

Funding details: Number: 61475156,61975231, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:item：National Natural Science Foundation of China（Nos. 61975231，61475156）

Database:Compendex

Accession number:20214411086118

Title:Job Recommendation System Based on Analytic Hierarchy Process and K-means Clustering (Open Access)

Authors:Feng, Peini (1); Jiahao Jiang, Charles (1); Wang, Jiale (1); Yeung, Sunny (1); Li, Xijie (2)

Author affiliation:(1) Guangdong Country Garden School, China; (2) Xi'An Institute of Optics and Precision Mechanics of CAS, China

Source title:ACM International Conference Proceeding Series

Abbreviated source title:ACM Int. Conf. Proc. Ser.

Part number:1 of 1

Issue title:ICCMS 2021 - Proceedings of the 13th International Conference on Computer Modeling and Simulation

Issue date:June 25, 2021

Publication year:2021

Pages:104-113

Language:English

ISBN-13:9781450389792

Document type:Conference article (CA)

Conference name:13th International Conference on Computer Modeling and Simulation, ICCMS 2021

Conference date:June 25, 2021 - June 27, 2021

Conference location:Virtual, Online, Australia

Conference code:172560

Publisher:Association for Computing Machinery

Abstract:<div data-language="eng" data-ev-field="abstract">Many students search for summer jobs during the vacation, but there are always too many choices. We need to find a way to help people choose a best summer job. We constructed a three-tier system to comprehensively illustrate the factors that high school students need to consider when looking for a summer job from the criteria of comfort, salary, personal gain, and matching degree. Under each criterion lie several sub-criteria (which are discussed later in detail). We also investigated students' opinions toward each factor to get the judgement matrices for our AHP model. To reduce the subjectivity of the AHP model and reduce the correlation of various indexes in model construction, the AHP model and principal component analysis model were combined to construct the optimal weight model to obtain the optimal weight. And we utilized K-means clustering model to classify the work, adopted elbow method to determine the K value of the number of categories divided according to SSE (Sum of the squared errors) from the perspective of the data itself, and selected the class with the highest clustering center as the selection range of students. Finally we created ten fictional persons based on the samples we chose. The relevant questionnaires tested the students' character ability, and we used the GRNN neural network model to map the questionnaire to the weight. In this way, our model can conveniently get the weight result and calculate to help students find the optimal jobs collection by filling in the questionnaire.<br/></div> © 2021 ACM.

Number of references:24

Main heading:Students

Controlled terms:Hierarchical systems - Learning systems - Compensation (personnel) - K-means clustering - Principal component analysis - Surveys

Uncontrolled terms:High school students - Judgment matrix - K-means++ clustering - Matching degree - Metric learning - Optimal weight - Person re identifications - Process mean - Similarity - Three-tier systems

Classification code:903.1 Information Sources and Analysis - 912.4 Personnel - 922.2 Mathematical Statistics - 961 Systems Science

DOI:10.1145/3474963.3474978

Database:Compendex

Open Access type(s): All Open Access, Bronze

Accession number:20205209675945

Title:TTH-RNN: Tensor-Train Hierarchical Recurrent Neural Network for Video Summarization

Authors:Zhao, Bin (1); Li, Xuelong (1); Lu, Xiaoqiang (2)

Author affiliation:(1) School of Computer Science and Center for Optical Imagery Analysis and Learning, Northwestern Polytechnical University, Xi'an, China; (2) Key Laboratory of Spectral Imaging Technology CAS, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China

Corresponding author:Lu, Xiaoqiang(luxq666666@gmail.com)

Source title:IEEE Transactions on Industrial Electronics

Abbreviated source title:IEEE Trans Ind Electron

Volume:68

Issue:4

Issue date:April 2021

Publication year:2021

Pages:3629-3637

Article number:9037206

Language:English

ISSN:02780046

E-ISSN:15579948

CODEN:ITIED6

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:Although a recurrent neural network (RNN) has achieved tremendous advances in video summarization, there are still some problems remaining to be addressed. In this article, we focus on two intractable problems when applying an RNN to video summarization: first the extremely large feature-to-hidden matrices. Since video features are usually in a high-dimensional space, it leads to extremely large feature-to-hidden mapping matrices in the RNN model, which increases the training difficulty. Second, the deficiency in long-range temporal dependence exploration. Most videos contain thousands of frames at least, which is such a long sequence that traditional RNNs cannot deal well with. Facing the abovementioned two problems, we develop a tensor-train hierarchical recurrent neural network (TTH-RNN) for the video summarization task. It contains a tensor-train embedding layer to avert the large feature-to-hidden matrices, together with a hierarchical structure of an RNN to explore the long-range temporal dependence among video frames. Practically, the experimental results on four benchmark datasets, including SumMe, TVsum, MED, and VTW, have demonstrated the excellent performance of a TTH-RNN in video summarization.<br/> © 1982-2012 IEEE.

Number of references:43

Main heading:Recurrent neural networks

Controlled terms:Embeddings - Video recording - Tensors - Benchmarking

Uncontrolled terms:Benchmark datasets - Hierarchical structures - High dimensional spaces - Long sequences - Recurrent neural network (RNN) - Temporal dependence - Video features - Video summarization

Classification code:716.4 Television Systems and Equipment - 723.4 Artificial Intelligence - 921.1 Algebra

DOI:10.1109/TIE.2020.2979573

Funding details: Number: XAB2017B15, Acronym: -, Sponsor: -;Number: 2017YFB0502900, Acronym: -, Sponsor: -;Number: 61702498,61772510, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: QYZDB-SSW-JSC015,QYZDY-SSW-JSC044, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: -, Acronym: -, Sponsor: Key Research Program of Frontier Science, Chinese Academy of Sciences;

Funding text:Manuscript received May 28, 2019; revised October 15, 2019 and January 10, 2020; accepted February 26, 2020. Date of publication March 16, 2020; date of current version December 8, 2020. This work was supported in part by the National Natural Science Foundation of China under Grant 61772510 and Grant 61702498, in part by the Key Research Program of Frontier Sciences, CAS under Grant QYZDY-SSW-JSC044, in part by the Young Top-Notch Talent Program of Chinese Academy of Sciences under Grant QYZDB-SSW-JSC015, in part by the National Key R&D Program of China under Grant 2017YFB0502900, and in part by the CAS Light of West China Program under Grant XAB2017B15. (Corresponding author: Xiaoqiang Lu.) Bin Zhao and Xuelong Li are with the School of Computer Science and Center for Optical Imagery Analysis and Learning, Northwestern Polytechnical University, Xi’an 710072, China (e-mail: binzhao111 @gmail.com; xuelong_li@nwpu.edu.cn).

Database:Compendex

Accession number:20213910959507

Title:Expression Recognition Algorithm Based on Infrared Image

Authors:Cui, Ying (1); Qiu, Shi (2)

Author affiliation:(1) College of Equipment Management and Support, Engineering University of PAP, Xi’an; 710086, China; (2) Key Laboratory of Spectral Imaging Technology CAS, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China

Corresponding author:Qiu, Shi(qiushi215@163.com)

Source title:Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering, LNICST

Abbreviated source title:Lect. Notes Inst. Comput. Sci. Soc. Informatics Telecommun. Eng.

Volume:388

Part number:2 of 2

Issue title:Multimedia Technology and Enhanced Learning - 3rd EAI International Conference, ICMTEL 2021, Proceedings

Issue date:2021

Publication year:2021

Pages:321-330

Language:English

ISSN:18678211

E-ISSN:1867822X

ISBN-13:9783030825645

Document type:Conference article (CA)

Conference name:3rd EAI International Conference on Multimedia Technology and Enhanced Learning, ICMTEL 2021

Conference date:April 8, 2021 - April 9, 2021

Conference location:Virtual, Online

Conference code:262979

Publisher:Springer Science and Business Media Deutschland GmbH

Abstract:<div data-language="eng" data-ev-field="abstract">It’s important to recognize facial expressions in social communication. To solve the problem that facial expression recognition by visible light is vulnerable to interference, we built a model from the perspective of thermal infrared. Based on the distribution characteristics of thermal infrared, the face region is firstly located by building a multi-projection model toward color. Then, the level set function of the local Gaussian fitting model was optimized, the regular term was removed, and the larger iteration step size was selected to achieve accurate face segmentation on the premise of segmentation accuracy. Finally, based on the structure of traditional deep learning network, the characteristics of DPN and CBAM network are given full play to realize expression recognition by thermal infrared images.<br/></div> © 2021, ICST Institute for Computer Sciences, Social Informatics and Telecommunications Engineering.

Number of references:27

Main heading:Face recognition

Controlled terms:Infrared imaging - Deep learning - Iterative methods - Infrared radiation

Uncontrolled terms:Expression recognition - Face - Facial expression recognition - Facial Expressions - Identify - Level Set - Multi-projection - Recognition algorithm - Social communications - Thermal-infrared

Classification code:461.4 Ergonomics and Human Factors Engineering - 741.1 Light/Optics - 746 Imaging Techniques - 921.6 Numerical Methods

DOI:10.1007/978-3-030-82565-2_26

Funding details: Number: 2020M682144, Acronym: -, Sponsor: China Postdoctoral Science Foundation;Number: -, Acronym: ZJU, Sponsor: Zhejiang University;Number: A2026, Acronym: -, Sponsor: State Key Laboratory of Computer Aided Design and Computer Graphics;

Funding text:Acknowledgement. This work is supported by Postdoctoral Science Foundation of China under Grant No. 2020M682144. The Open Project Program of the State Key Lab of CAD&CG (Grant No. A2026), Zhejiang University.

Database:Compendex

Accession number:20204109318719

Title:The nonlinear optical properties of two-dimensional metal-organic framework

Authors:Cheng, Xuemei (1, 2); Yao, Jingjing (1); Zhang, Hui (3); Wang, Xing (2); Bai, Jintao (1)

Author affiliation:(1) State Key Laboratory of Photoelectric Technology and Functional Materials, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon-Technology, Northwest University, Xi'an; 710069, China; (2) State Key Laboratory of Transient Optics and Photonics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) Okinawa Institute of Science and Technology Graduate University, Okinawa; 9040495, Japan

Corresponding author:Cheng, Xuemei(xmcheng@nwu.edu.cn)

Source title:Journal of Alloys and Compounds

Abbreviated source title:J Alloys Compd

Volume:855

Issue date:February 25, 2021

Publication year:2021

Article number:157433

Language:English

ISSN:09258388

CODEN:JALCEU

Document type:Journal article (JA)

Publisher:Elsevier Ltd

Abstract:We report the investigation on the nonlinear optical properties of two typical two-dimensional metal-organic frameworks (2D MOFs) - 2D Cu-MOF and Zn-MOF (copper/zinc 1,4-benzene dicarboxylate, CuBDC and ZnBDC) using spatial self-phase modulation (SSPM) and spatial cross-phase modulation (SXPM) methods. It is found that 2D Cu-MOF exhibits a large nonlinear optical coefficient n<inf>2</inf>=5.2010<sup>-11</sup>m<sup>2</sup>/Wandχ<sup>3</sup>=8.2410<sup>−11</sup>e.s.u. By contrast, no nonlinear optical effect was observed from 2D Zn-MOF under the same condition. The main reason is the Cu center of Cu-MOF has variable valence electrons and a vacant 3d atom orbit, which can form a conjugated system with organic ligands through the d-π interaction and therefore strengthen the nonlinear optical effect by the delocalization of π electrons. However, the Zn ion of Zn-MOF with fixed valence electrons and fully occupied d orbit makes it hard to produce observable nonlinear optical effect. Furthermore, we demonstrated the ability of 2D Cu-MOF in all-optical spatial light modulation and optical switch based on the principle of SXPM. This work sheds light on the physics of 2D MOFs in all-optical light modulation, providing an insight for rational design of 2D MOFs with high nonlinear optical coefficients in future.<br/> © 2020 Elsevier B.V.

Number of references:45

Main heading:Nonlinear optics

Controlled terms:Carboxylation - Light - Optical signal processing - Organic polymers - Light modulation - Phase modulation - Optical properties - Optical switches - Metal-Organic Frameworks

Uncontrolled terms:Conjugated systems - Cross phase modulation - Non-linear optical coefficients - Non-linear optical properties - Nonlinear optical effects - Spatial light modulation - Spatial self-phase modulation - Two-dimensional metals

Classification code:531.1 Metallurgy - 741.1 Light/Optics - 741.1.1 Nonlinear Optics - 741.3 Optical Devices and Systems - 802.2 Chemical Reactions - 804.1 Organic Compounds - 815.1.1 Organic Polymers

DOI:10.1016/j.jallcom.2020.157433

Funding details: Number: 11874299,51927804,61805200, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2020JM-432, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;Number: SKLST201906, Acronym: SKLTOP, Sponsor: State Key Laboratory of Transient Optics and Photonics;

Funding text:This work is supported by the National Natural Science Foundation of China ( 61805200 , 11874299 and 51927804 ), Natural Science Foundation of Shaanxi Province (No. 2020JM-432 ), and the fund of State Key Laboratory of Transient Optics and Photonics ( SKLST201906 ).

Database:Compendex

Accession number:20210910015670

Title:Application of U-Net Based Multiparameter Magnetic Resonance Image Fusion in the Diagnosis of Prostate Cancer (Open Access)

Authors:Huang, Xunan (1); Zhang, Bo (2); Zhang, Xiaoling (3); Tang, Min (3); Miao, Qiguang (1); Li, Tanping (4); Jia, Guang (1)

Author affiliation:(1) School of Computer Science and Technology, Xidian University, Xi'an; 710071, China; (2) Tangdu Hospital, Air Force Military Medical University, Xi'an; 710038, China; (3) MRI Room, Shaanxi Provincial People's Hospital, Xi'an; 710068, China; (4) School of Physics and Optoelectronic Engineering, Xidian University, Xi'an; 710071, China

Corresponding authors:Jia, Guang(gjia@xidian.edu.cn); Li, Tanping(pli@xidian.edu.cn)

Source title:IEEE Access

Abbreviated source title:IEEE Access

Volume:9

Issue date:2021

Publication year:2021

Pages:33756-33768

Article number:9360594

Language:English

E-ISSN:21693536

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:Medical image fusion technology has been widely used in clinical practice by doctors to better understand lesion regions through the fusion of multiparametric medical images. This paper proposes an automated fusion method based on a U-Net. Through neural network learning, a weight distribution is generated based on the relationship between the image feature information and the multifocus training target. The MRI image pair of prostate cancer (axial T2-weighted and ADC map) is fused using a strategy based on local similarity and Gaussian pyramid transformation. Experimental results show that the fusion method can enhance the appearance of prostate cancer in terms of both visual quality and objective evaluation.<br/> © 2013 IEEE.

Number of references:52

Main heading:Image fusion

Controlled terms:Magnetic resonance imaging - Medical imaging - Diagnosis - Diseases - Urology

Uncontrolled terms:Clinical practices - Gaussian pyramids - Local similarity - Neural network learning - Objective evaluation - Prostate cancers - Visual qualities - Weight distributions

Classification code:461.1 Biomedical Engineering - 461.6 Medicine and Pharmacology - 701.2 Magnetism: Basic Concepts and Phenomena - 723.2 Data Processing and Image Processing - 746 Imaging Techniques

DOI:10.1109/ACCESS.2021.3061078

Funding details: Number: -, Acronym: MOE, Sponsor: Ministry of Education of the People's Republic of China;Number: -, Acronym: MOE, Sponsor: Ministry of Education;

Funding text:This work was supported in part by the Xidian University Startup Fund, and in part by The Ministry of Education's free exploration fund.This work was supported in part by the Xidian University Startup Fund, and in part by The Ministry of Education’s free exploration fund.

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20211310151897

Title:Indium selenide saturable absorber for high-energy nanosecond Q-switched pulse generation

Authors:Li, Lu (1); Wang, Yao (1); Jin, Wei (1); Zhao, Qiyi (1); Su, Yulong (2)

Author affiliation:(1) School of Science, Xi’an University of Posts and Telecommunications, Xi’an; 710121, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences (CAS), Xi’an; 710119, China

Corresponding author:Li, Lu(liluyoudian@163.com)

Source title:Applied Optics

Abbreviated source title:Appl. Opt.

Volume:60

Issue:2

Issue date:January 10, 2021

Publication year:2021

Pages:427-432

Language:English

ISSN:1559128X

E-ISSN:21553165

CODEN:APOPAI

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:As a kind of III/VI group compound 2D layered material, indium selenide (In<inf>2</inf>Se<inf>3</inf>) has attracted tremendous interest because of its favorable optoelectronic characteristics. Here, magnetron sputtering deposition (MSD) technology was employed to prepare an In<inf>2</inf>Se<inf>3</inf>-based saturable absorber (SA). The nonlinear optical properties of this SA, whose modulation depth (1T) is 6.18%, were studied. With the aid of its saturable absorption, a stable two-wavelength Q-switching Er-doped fiber (EDF) laser was established. When pump power was adjusted to 900 mW, the output power was increased to 63.84 mW. The shortest pulse duration and maximum pulse energy were estimated to be 556 ns and 376 nJ, respectively. The signal-to-noise ratio of 70 dB proves this fiber laser has high stability. In comparison with previous works, the laser performance in this study is improved significantly. These results indicate that the In<inf>2</inf>Se<inf>3</inf> holds promise as an outstanding candidate for high-energy pulse generation and will advance the development of In<inf>2</inf>Se<inf>3</inf>-based nonlinear photonics devices.<br/> © 2021 Optical Society of America

Number of references:49

Main heading:Saturable absorbers

Controlled terms:Fiber lasers - Indium compounds - Optical properties - Signal to noise ratio - Nonlinear optics - Q switching - Selenium compounds - Semiconductor quantum wells

Uncontrolled terms:High energy pulse - Laser performance - Magnetron-sputtering deposition - Non-linear optical properties - Nonlinear photonics - Optoelectronic characteristics - Q-switched pulse - Saturable absorption

Classification code:714.2 Semiconductor Devices and Integrated Circuits - 716.1 Information Theory and Signal Processing - 741.1 Light/Optics - 741.1.1 Nonlinear Optics - 744.1 Lasers, General - 744.4 Solid State Lasers - 744.8 Laser Beam Interactions

Numerical data indexing:Decibel 7.00e+01dB, Energy 3.76e-07J, Magnetic_Flux_Density 1.00e+00T, Percentage 6.18e+00%, Power 6.38e-02W, Power 9.00e-01W, Time 5.56e-07s

DOI:10.1364/AO.414750

Funding details: Number: 12075190, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2019JM-131,2019JQ-446, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;Number: 20190113, Acronym: SUST, Sponsor: Shaanxi University of Science and Technology;Number: 19JK0811, Acronym: -, Sponsor: Education Department of Shaanxi Province;

Funding text:Funding. Science Research Foundation of the Education Department of Shaanxi Province, China (19JK0811); Young Talent fund of University Association for Science and Technology in Shaanxi, China (20190113); Natural Science Foundation of Shaanxi Province (2019JM-131, 2019JQ-446); National Natural Science Foundation of China (12075190).

Database:Compendex

Accession number:20214911285705

Title:Laser beam jitter control of the link in free space optical communication systems (Open Access)

Authors:Wang, Xuan (1, 2, 3); Su, Xiuqin (1); Liu, Guizhong (2); Han, Junfeng (1); Wang, Rui (1, 3); Wang, Kaidi (1, 3)

Corresponding author:Su, Xiuqin(suxiuqin@opt.ac.cn)

Source title:Optics Express

Abbreviated source title:Opt. Express

Volume:29

Issue:25

Issue date:December 6, 2021

Publication year:2021

Pages:41582-41599

Language:English

E-ISSN:10944087

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">The pointing and tracking performance of laser beams in free space optical communi-<br/>cation (FSOC) systems and other precision laser systems is severely limited by beam jitter. This research proposes an adaptive control method to suppress beam jitter by adjusting the deflection angle of the beam by controlling the fast steering mirror (FSM) driven by piezoelectric ceramics. In order to verify the effectiveness of the control method, we have established an experimental platform. First, the internal controller of the FSM is adjusted to an approximately linear system, aiming to turn the input and output control signals into a linear relationship. Based on the adaptive filter, a filtered-x variable step-size normalized least mean square (FxVSNLMS) algorithm is proposed. To further improve the robustness of the controller, a Proportion Integral Differential (PID) controller and an adaptive controller which work in parallel are then added to the control loop. Finally, experimental results are provided and compare with the traditional controller and other adaptive control methods. Experimental results show that for more complex narrow-band and broad-band mixed beam disturbances, the control scheme developed in this research is significantly improved. This conclusion has also been verified on the ground experimental platform of FSOC.<br/></div> © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Number of references:26

Main heading:Controllers

Controlled terms:Adaptive control systems - Adaptive optics - Piezoelectric ceramics - Adaptive filtering - Laser beams - Optical communication - Jitter - Adaptive filters - Linear systems - Proportional control systems

Uncontrolled terms:Adaptive control methods - Beam jitter - Experimental platform - Fast-steering mirrors - Free space optical communication systems - Free-space optical - Free-space optical communications systems - Jitter control - Laser beam jitters - Pointing and tracking

Classification code:708.1 Dielectric Materials - 717.1 Optical Communication Systems - 731.1 Control Systems - 732.1 Control Equipment - 741.1 Light/Optics - 744.8 Laser Beam Interactions - 812.1 Ceramics - 961 Systems Science

DOI:10.1364/OE.443411

Funding details: Number: 61875257, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:National Natural Science Foundation of China (61875257). The authors express sincere thanks for the experiments provided by the Photoelectric Tracking and Measurement Technology Laboratory, Xi’an Institute of Optics and Precision Mechanics, CAS. The authors are very grateful to Dr. Zengxin Liu for polishing the language of the paper.National Natural Science Foundation of China (61875257).

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20212810622827

Title:An improved fusion method of infrared and visible images based on fusionGAN

Authors:Yao, Zhiqiang (1, 2); Guo, Huinan (2); Ren, Long (2)

Author affiliation:(1) University of Chinese Academy of Sciences, Yuquan Road, No.19, Shijingshan District, Beijing; 100049, China; (2) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xinxi Road, No.17, Gaoxin District, Shaanxi, Xi’an; 710119, China

Corresponding author:Guo, Huinan(guohuinan163@163.com)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11878

Part number:1 of 1

Issue title:Thirteenth International Conference on Digital Image Processing, ICDIP 2021

Issue date:2021

Publication year:2021

Article number:118781H

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510646001

Document type:Conference article (CA)

Conference name:13th International Conference on Digital Image Processing, ICDIP 2021

Conference date:May 20, 2021 - May 23, 2021

Conference location:Singapore, Singapore

Conference code:169927

Sponsor:International Association of Computer Science and Information Technology

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">Convolutional neural network is widely used in image fusion. However, the deep learning framework is only applied in some part of the fusion process in most existing methods. To generate a full end-to-end image fusion pipeline, a Y-shaped Generator model based on Generative Adversarial Network for infrared and visible image fusion is proposed. The idea of this method is to establish an adversarial game between the generator and the discriminator. The generator consisting of two Pyramid networks and three convolutional layers works as an autoencoder to improve the characteristic information of the fused images. As for the discriminator, it adopts a network structure similar to the Visual Geometry Group (VGG) network. The loss function uses the ratio loss to control the trade-off among generation loss and reconstruction loss. Results on publicly available datasets demonstrate that our method can improve the quality of detail information and sharpen the edge of infrared targets.<br/></div> © 2021 SPIE

Number of references:21

Main heading:Image fusion

Controlled terms:Image enhancement - Economic and social effects - Infrared imaging - Learning systems - Deep learning - Generative adversarial networks - Convolution - Convolutional neural networks

Uncontrolled terms:Adversarial networks - Fusion methods - Generator modeling - Infrared and visible image - Infrared target - Learning frameworks - Network structures - Pyramid network

Classification code:461.4 Ergonomics and Human Factors Engineering - 716.1 Information Theory and Signal Processing - 723.2 Data Processing and Image Processing - 723.4 Artificial Intelligence - 746 Imaging Techniques - 971 Social Sciences

DOI:10.1117/12.2599559

Database:Compendex

Accession number:20211210117149

Title:Recent advancements of the lidar technique based on the Scheimpflug imaging principle (Invited)

Title of translation:基于沙氏成像原理的激光雷达技术研究进展(特邀)

Authors:Mei, Liang (1); Kong, Zheng (1); Lin, Hongze (2); Fei, Ruonan (1); Cheng, Yuan (1); Gong, Zhenfeng (1); Chen, Ke (1); Liu, Kun (1); Hua, Dengxin (1, 3)

Author affiliation:(1) School of Optoelectronic Engineering and Instrumentation Science, Dalian University of Technology, Dalian; 116024, China; (2) School of Automation, Hangzhou Dianzi University, Hangzhou; 310018, China; (3) School of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, Xi'an; 710048, China

Corresponding authors:Mei, Liang(meiliang@dlut.edu.cn); Hua, Dengxin(dengxinhua@xaut.edu.cn)

Source title:Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering

Abbreviated source title:Hongwai yu Jiguang Gongcheng Infrared Laser Eng.

Volume:50

Issue:3

Issue date:March 25, 2021

Publication year:2021

Article number:20210033

Language:Chinese

ISSN:10072276

Document type:Journal article (JA)

Publisher:Chinese Society of Astronautics

Abstract:When the object plane is not parallel to the lens plane in an imaging system, if the image plane, the object plane and the lens plane intersect into a straight line—satisfying the Scheimpflug imaging principle, the imaging system can still clearly image the object and achieve infinite depth-of-focus (DoF). The newly developed Scheimpflug lidar (SLidar) technique based on the Scheimpflug imaging principle can thus utilize continuous wave diode lasers as light sources and image sensors as detectors, featuring short blind range, compact structure, low maintenance and high cost performance, etc. In recent years, the SLidar technique has gradually been applied to the fields of atmospheric environment monitoring, three-dimensional (3D) target imaging, fluorescence(hyperspectral) lidar detection, ecological studies, combustion diagnosis, and water-body optical measurements, etc. This article will thoroughly explain the basic principles of the SLidar technique, discuss latest progresses in these fields and present its perspectives.<br/> Copyright ©2021 Infrared and Laser Engineering. All rights reserved.

Number of references:63

Main heading:Fluorescence

Controlled terms:Continuous wave lasers - Imaging systems - Hyperspectral imaging - Optical data processing - Optical remote sensing - Combustion - Optical radar

Uncontrolled terms:Atmospheric environment - Combustion diagnosis - Compact structures - Continuous-wave diode laser - Ecological studies - Optical measurement - Scheimpflug imaging - Threedimensional (3-d)

Classification code:716.2 Radar Systems and Equipment - 723.2 Data Processing and Image Processing - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 744.1 Lasers, General - 746 Imaging Techniques

DOI:10.3788/IRLA20210033

Database:Compendex

Accession number:20212410514876

Title:Enhanced upconversion emission of NaGdF<inf>4</inf>: Yb<sup>3+</sup>/Tm<sup>3+</sup> crystals by introducing Li<sup>+</sup> ions for anti-counterfeiting recognition

Authors:Li, Dongdong (1); Mo, Jianye (1); Wang, Chong (1); Wu, Zhiwei (1); Hao, Aihua (1); She, Jiangbo (2)

Author affiliation:(1) School of Electronic Engineering, Xi’ an University of Post and Telecommunications, Xi’ an; 710121, China; (2) State Key Laboratory of Transient Optics and Photonics, Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China

Corresponding author:Li, Dongdong(dongdong19821111@163.com)

Source title:Applied Physics A: Materials Science and Processing

Abbreviated source title:Appl Phys A

Volume:127

Issue:7

Issue date:July 2021

Publication year:2021

Article number:522

Language:English

ISSN:09478396

E-ISSN:14320630

CODEN:APAMFC

Document type:Journal article (JA)

Publisher:Springer Science and Business Media Deutschland GmbH

Abstract:<div data-language="eng" data-ev-field="abstract">The upconversion efficiency could be affected by Li<sup>+</sup> ions with changing the local crystal field of nanoparticles. Therefore, a series of NaGdF<inf>4</inf>:Yb<sup>3+</sup>/Tm<sup>3+</sup> micro-particles with different Li<sup>+</sup> doping concentrations were synthesized and investigated, respectively. The structure and morphology of the synthesized materials were tested by X-ray diffraction and scanning electron microscope. The photoluminescence properties were studied with different concentrations Li<sup>+</sup> ions doping under the irradiation of 980 nm laser. The emission peaks of Tm<sup>3+</sup> ions are 449, 477, 645, 723, 800 nm which are attributed to high excited states to ground state <sup>3</sup>H<inf>6</inf> transition through a multiple steps resonance energy transfer from excited Yb<sup>3+</sup>. The enormous increase in upconversion emission in upconversion micro-particles (UCMPs) by introducing Li<sup>+</sup> ions was observed by the naked eye. The strongest photoluminescence intensity is the sample with 2.5% doped Li<sup>+</sup> ions. Additionally, the practicality of the resultant UCMPs for photoluminescence visible imaging was systematically investigated. These results suggest that the Li<sup>+</sup> doped NaGdF<inf>4</inf>: Yb<sup>3+</sup>/Tm<sup>3+</sup> is very promising as a screen printing material for anti-counterfeiting recognition.<br/></div> © 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH, DE part of Springer Nature.

Number of references:30

Main heading:Energy transfer

Controlled terms:Excited states - Screen printing - Ground state - Hydrothermal synthesis - Ions - Scanning electron microscopy - Photoluminescence

Uncontrolled terms:Doping concentration - Photoluminescence intensities - Photoluminescence properties - Resonance energy transfer - Structure and morphology - Synthesized materials - Up-conversion efficiency - Up-conversion emission

Classification code:741.1 Light/Optics - 745.1 Printing - 802.2 Chemical Reactions - 931.3 Atomic and Molecular Physics - 931.4 Quantum Theory; Quantum Mechanics

Numerical data indexing:Percentage 2.50e+00%

DOI:10.1007/s00339-021-04674-8

Database:Compendex

Accession number:20211710243143

Title:Sparse constrained low tensor rank representation framework for hyperspectral unmixing (Open Access)

Authors:Dong, Le (1, 2); Yuan, Yuan (3)

Author affiliation:(1) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) School of Artificial Intelligence, Optics and Electronics (iOPEN), Northwestern Polytechnical University, Xi’an; 710072, China

Corresponding author:Yuan, Yuan(y.yuan@nwpu.edu.cn)

Source title:Remote Sensing

Abbreviated source title:Remote Sens.

Volume:13

Issue:8

Issue date:April 2, 2021

Publication year:2021

Article number:1473

Language:English

E-ISSN:20724292

Document type:Journal article (JA)

Publisher:MDPI AG

Abstract:<div data-language="eng" data-ev-field="abstract">Recently, non-negative tensor factorization (NTF) as a very powerful tool has attracted the attention of researchers. It is used in the unmixing of hyperspectral images (HSI) due to its excellent expression ability without any information loss when describing data. However, most of the existing unmixing methods based on NTF fail to fully explore the unique properties of data, for example, low rank, that exists in both the spectral and spatial domains. To explore this low-rank structure, in this paper we learn the different low-rank representations of HSI in the spectral, spatial and non-local similarity modes. Firstly, HSI is divided into many patches, and these patches are clustered multiple groups according to the similarity. Each similarity group can constitute a 4-D tensor, including two spatial modes, a spectral mode and a non-local similarity mode, which has strong low-rank properties. Secondly, a low-rank regularization with logarithmic function is designed and embedded in the NTF framework, which simulates the spatial, spectral and non-local similarity modes of these 4-D tensors. In addition, the sparsity of the abundance tensor is also integrated into the unmixing framework to improve the unmixing performance through the L<inf>2,1</inf> norm. Experiments on three real data sets illustrate the stability and effectiveness of our algorithm compared with five state-of-the-art methods.<br/></div> © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Number of references:46

Main heading:Tensors

Controlled terms:Spectroscopy - Factorization

Uncontrolled terms:Hyperspectral unmixing - Information loss - Logarithmic functions - Low-rank properties - Low-rank representations - Non-local similarities - Spatial domains - Tensor factorization

Classification code:921 Mathematics - 921.1 Algebra

DOI:10.3390/rs13081473

Funding details: Number: 61632018, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 61825603, Acronym: BNSF, Sponsor: Bulgarian National Science Fund;Number: 2020YFB2103902, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Funding text:This research was funded by National Key R&D Program of China 2020YFB2103902, The National Science Fund for Distinguished Young Scholars 61825603 and Key Program of National Natural Science Foundation of China 61632018.

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20212210439340

Title:Tunable wettability pattern transfer photothermally achieved on zinc with microholes fabricated by femtosecond laser (Open Access)

Authors:Li, Fengping (1, 2); Feng, Guang (2); Yang, Xiaojun (3); Lu, Chengji (2); Ma, Guang (2); Li, Xiaogang (2); Xue, Wei (2); Sun, Haoran (2)

Author affiliation:(1) School of Aerospace Engineering, Xiamen University, Xiamen; 361005, China; (2) Zhejiang Provincial Engineering Lab of Laser and Optoelectronic Intelligent Manufacturing, Wenzhou University, Wenzhou; 325035, China; (3) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China

Corresponding author:Li, Fengping(lfp@wzu.edu.cn)

Source title:Micromachines

Abbreviated source title:Micromachines

Volume:12

Issue:5

Issue date:2021

Publication year:2021

Article number:547

Language:English

E-ISSN:2072666X

Document type:Journal article (JA)

Publisher:MDPI AG

Abstract:<div data-language="eng" data-ev-field="abstract">A quickly tunable wettability pattern plays an important role in regulating the surface behavior of liquids. Light irradiation can effectively control the pattern to achieve a specific wettability pattern on the photoresponsive material. However, metal oxide materials based on light adjustable wettability have a low regulation efficiency. In this paper, zinc (Zn) superhydrophobic surfaces can be obtained by femtosecond-laser-ablated microholes. Owing to ultraviolet (UV) irradiation increasing the surface energy of Zn and heating water temperature decreasing the surface energy of water, the wettability of Zn can be quickly tuned photothermally. Then, the Zn superhydrophobic surfaces can be restored by heating in the dark. Moreover, by tuning the pattern of UV irradiation, a specific wettability pattern can be transferred by the Zn microholes, which has a potential application value in the field of new location-controlled micro-/nanofluidic devices, such as microreactors and lab-on-chip devices.<br/></div> © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Number of references:31

Main heading:Wetting

Controlled terms:Femtosecond lasers - Zinc - Irradiation - Temperature - Surface properties - Interfacial energy

Uncontrolled terms:Lab-on-chip devices - Light irradiations - Location controlled - Metal oxide materials - Super-hydrophobic surfaces - Tunable wettabilities - Ultraviolet irradiations - Water temperatures

Classification code:546.3 Zinc and Alloys - 641.1 Thermodynamics - 744.1 Lasers, General - 931.2 Physical Properties of Gases, Liquids and Solids - 951 Materials Science

DOI:10.3390/mi12050547

Funding details: Number: ZG2019031, Acronym: -, Sponsor: -;Number: 2018YFB1108000, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Funding text:Funding: This research was funded by the Laser Manufacturing and Additive Manufacturing Project of the National Key Research and Development Program of China (2018YFB1108000); Wenzhou Municipal Key Science and Research Program (ZG2019031).

Database:Compendex

Open Access type(s): All Open Access, Gold, Green

Accession number:20213310758679

Title:Bio-Inspired Representation Learning for Visual Attention Prediction (Open Access)

Authors:Yuan, Yuan (1); Ning, Hailong (2, 3); Lu, Xiaoqiang (2)

Author affiliation:(1) Center for Optical Imagery Analysis and Learning, School of Computer Science, Northwestern Polytechnical University, Xi'an, China; (2) Key Laboratory of Spectral Imaging Technology CAS, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Lu, Xiaoqiang(luxq666666@gmail.com)

Source title:IEEE Transactions on Cybernetics

Abbreviated source title:IEEE Trans. Cybern.

Volume:51

Issue:7

Issue date:July 2021

Publication year:2021

Pages:3562-3575

Article number:8822602

Language:English

ISSN:21682267

E-ISSN:21682275

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">Visual attention prediction (VAP) is a significant and imperative issue in the field of computer vision. Most of the existing VAP methods are based on deep learning. However, they do not fully take advantage of the low-level contrast features while generating the visual attention map. In this article, a novel VAP method is proposed to generate the visual attention map via bio-inspired representation learning. The bio-inspired representation learning combines both low-level contrast and high-level semantic features simultaneously, which are developed by the fact that the human eye is sensitive to the patches with high contrast and objects with high semantics. The proposed method is composed of three main steps: 1) feature extraction; 2) bio-inspired representation learning; and 3) visual attention map generation. First, the high-level semantic feature is extracted from the refined VGG16, while the low-level contrast feature is extracted by the proposed contrast feature extraction block in a deep network. Second, during bio-inspired representation learning, both the extracted low-level contrast and high-level semantic features are combined by the designed densely connected block, which is proposed to concatenate various features scale by scale. Finally, the weighted-fusion layer is exploited to generate the ultimate visual attention map based on the obtained representations after bio-inspired representation learning. Extensive experiments are performed to demonstrate the effectiveness of the proposed method.<br/></div> © 2019 IEEE.

Number of references:60

Main heading:Forecasting

Controlled terms:Behavioral research - Biomimetics - Feature extraction - Deep learning - Extraction - Semantics

Uncontrolled terms:High contrast - High-level semantic features - Human eye - Map generation - Visual Attention - Weighted fusion

Classification code:461.4 Ergonomics and Human Factors Engineering - 461.8 Biotechnology - 461.9 Biology - 802.3 Chemical Operations - 971 Social Sciences

DOI:10.1109/TCYB.2019.2931735

Funding details: Number: 61632018,61702498,61772510,61806193, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: QYZDB-SSW-JSC015, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 61825603, Acronym: -, Sponsor: China National Funds for Distinguished Young Scientists;Number: 2017YFB0502900,XAB2017B15,XAB2017B26, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Funding text:Manuscript received November 9, 2018; revised February 22, 2019, June 18, 2019, and July 11, 2019; accepted July 18, 2019. Date of publication September 2, 2019; date of current version June 23, 2021. This work was supported in part by the National Natural Science Foundation of China under Grant 61806193, Grant 61702498, and Grant 61772510, in part by the Young Top-Notch Talent Program of Chinese Academy of Sciences under Grant QYZDB-SSW-JSC015, in part by the National Key Research and Development Program of China under Grant 2017YFB0502900, in part by the CAS "Light of West China" Program under Grant XAB2017B26 and Grant XAB2017B15, in part by the National Natural Science Fund for Distinguished Young Scholars under Grant 61825603, and in part by the State Key Program of National Natural Science of China under Grant 61632018. This article was recommended by Associate Editor W. Hu. (Corresponding author: Xiaoqiang Lu.) Y. Yuan is with the Center for Optical Imagery Analysis and Learning, School of Computer Science, Northwestern Polytechnical University, Xi’an 710072, China.

Database:Compendex

Open Access type(s): All Open Access, Green

Accession number:20210509853416

Title:High-speed focusing and scanning light through a multimode fiber based on binary phase-only spatial light modulation

Authors:Geng, Yi (1, 2); Chen, Hui (1, 2); Zhang, Zaikun (1, 2); Zhuang, Bin (1, 2); Guo, Haitao (1, 2); He, Zhengquan (1); Kong, Depeng (1)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding authors:Guo, Haitao(guoht_001@opt.ac.cn); He, Zhengquan(zhqhe@opt.ac.cn)

Source title:Applied Physics B: Lasers and Optics

Abbreviated source title:Appl Phys B

Volume:127

Issue:2

Issue date:February 2021

Publication year:2021

Article number:25

Language:English

ISSN:09462171

CODEN:APBOEM

Document type:Journal article (JA)

Publisher:Springer Science and Business Media Deutschland GmbH

Abstract:A binary phase-only modulation technique was proposed to focus and scan light through a multimode fiber (MMF) based on spatial light modulator (SLM). For the same number of modulation modes, the number of iterations using this method is only 1/256 of that using phase-only iterative optimization or 1/3 of that using phase-only computation optimization, and the modulation time is at least one to two orders of magnitude shorter than previous wavefront shaping systems. Focusing and scanning light through an MMF with a 105 μm core diameter and 5 m length was achieved experimentally. This method can be extended to focus and scan light at multiple planes along the axial direction by modifying the input wavefront accordingly.<br/> © 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH, DE part of Springer Nature.

Number of references:38

Main heading:Multimode fibers

Controlled terms:Wavefronts - Iterative methods - Light modulators - Light modulation

Uncontrolled terms:Computation optimizations - Focusing and scanning - Iterative Optimization - Multi-mode fibers (MMF) - Number of iterations - Orders of magnitude - Spatial light modulation - Spatial light modulators

Classification code:741.1 Light/Optics - 741.1.2 Fiber Optics - 921.6 Numerical Methods

DOI:10.1007/s00340-021-07573-1

Funding details: Number: JCTD-2018-19, Acronym: -, Sponsor: -;Number: 61535015,61935006l, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2016YFB0303804, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Funding text:This study was funded by the National Natural Science Foundation of China (NSFC) (Nos. 61535015 and 61935006l), the National Key Research and Development Program of China (Grant No. 2016YFB0303804) and CAS Interdisciplinary Innovation Team Project (JCTD-2018-19).

Database:Compendex

Accession number:20212510533305

Title:Target classification algorithms based on multispectral imaging: A review

Authors:Zeng, Zimu (1, 2); Wang, Weifeng (1); Zhang, Wenbo (1)

Author affiliation:(1) Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, China; (2) University of Chinese, Academy of Sciences, China

Corresponding author:Zeng, Zimu(1281785013@qq.com)

Source title:ACM International Conference Proceeding Series

Abbreviated source title:ACM Int. Conf. Proc. Ser.

Part number:1 of 1

Issue title:2021 6th International Conference on Multimedia and Image Processing, ICMIP 2021

Issue date:January 8, 2021

Publication year:2021

Pages:12-21

Language:English

ISBN-13:9781450389167

Document type:Conference article (CA)

Conference name:6th International Conference on Multimedia and Image Processing, ICMIP 2021

Conference date:January 8, 2021 - January 10, 2021

Conference location:Zhuhai, China

Conference code:169503

Publisher:Association for Computing Machinery

Abstract:<div data-language="eng" data-ev-field="abstract">Multispectral imaging extracts rich spectral information from targets, which greatly expands the function of traditional imaging technology. Multispectral imaging is widely used in agriculture, military, medicine, industry, and meteorology. Because of the information redundancy in multispectral images, it is necessary to reduce the dimension by pre-processing. In recent years, most of the researchers have adopted the methods of pre-processing before classification. Based on the principles of feature selection, feature transformation, and feature extraction, common dimensionality reduction methods are introduced, and the advantages and disadvantages of them are discussed. Afterwards, classification methods are divided into traditional methods and deep learning methods, and their characteristics and application prospect are discussed. Through comparison, the former are cost-effective and have the mature theories, while the latter have strong adaptability and high classification accuracy. At present, methods could be optimized from the perspective of saving computing resources and using spectral information efficiently. In the future, traditional methods will be improved and comprehensively used, while new methods with stronger adaptability and precision will be developed.<br/></div> © 2021 ACM.

Number of references:62

Main heading:Image classification

Controlled terms:Feature extraction - Cost effectiveness - Deep learning - Computation theory - Learning systems

Uncontrolled terms:Classification accuracy - Classification methods - Dimensionality reduction method - Feature transformations - Information redundancies - Multispectral imaging - Spectral information - Target classification algorithms

Classification code:461.4 Ergonomics and Human Factors Engineering - 721.1 Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory - 723.2 Data Processing and Image Processing - 911.2 Industrial Economics

DOI:10.1145/3449388.3449393

Database:Compendex

Accession number:20204809527185

Title:Deep neural network oriented evolutionary parametric eye modeling

Authors:Zheng, Yang (1, 2); Fu, Hong (3); Li, Ruimin (1, 2); Hsung, Tai-Chiu (4); Song, Zongxi (1); Wen, Desheng (1)

Author affiliation:(1) Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an, China; (2) University of Chinese Academy of Sciences, Beijing, China; (3) Department of Mathematics and Information Technology, The Education University of Hong Kong, Hong Kong; (4) Department of Computer Science, Chu Hai College of Higher Education, China

Corresponding author:Fu, Hong(hfu@eduhk.hk)

Source title:Pattern Recognition

Abbreviated source title:Pattern Recogn.

Volume:113

Issue date:May 2021

Publication year:2021

Article number:107755

Language:English

ISSN:00313203

CODEN:PTNRA8

Document type:Journal article (JA)

Publisher:Elsevier Ltd

Abstract:Comprehensive and accurate eye modeling is crucial to a variety of applications, including human-computer interaction, assistive technologies, and medical diagnosis. However, most studies focus on the localization of one or two components of eyes, such as pupil or iris, lacking a comprehensive eye model. We propose to model an eye image by a set of parametric curves. The set of curves are plotted on an eye image to form a Contour-Eye image. A deep neural network is trained to evaluate the fitness of the Contour-Eye image. Then an evolutionary process is conducted to search the best fitting curve set, guided by the trained deep neural network. Finally, an accurate eye model with optimized parametric curves is obtained. For the algorithm evaluation, a finely annotated eye dataset denoted as FAED-50 is established by us, which contains 2,498 eye images from 50 subjects. The experimental results on the FAED-50 and the relabeled CASIA datasets and comparison with the state-of-the-art methods demonstrate the effectiveness and accuracy of the proposed parametric model.<br/> © 2020

Number of references:52

Main heading:Deep neural networks

Controlled terms:Diagnosis - Curve fitting - Evolutionary algorithms - Human computer interaction

Uncontrolled terms:Algorithm evaluation - Assistive technology - Best fitting curves - Evolutionary process - Parametric curve - Parametric modeling - State-of-the-art methods - Two-component

Classification code:461.4 Ergonomics and Human Factors Engineering - 461.6 Medicine and Pharmacology - 921.6 Numerical Methods

DOI:10.1016/j.patcog.2020.107755

Funding details: Number: UGC/FDS13/E01/17, Acronym: RGC, UGC, Sponsor: Research Grants Council, University Grants Committee;Number: MIT/SGA04/20–21, Acronym: EdUHK, Sponsor: Education University of Hong Kong;

Funding text:The research was supported by a grant from the Research Grants Council of the Hong Kong Special Administrative Region, China (Project Reference No.: UGC/FDS13/E01/17). The research was also supported by a grant from the The Education University of Hong Kong, China (MIT/SGA04/20–21).

Database:Compendex

Accession number:20212110396436

Title:Simple reformulation of the coordinate transformation method for gratings with a vertical facet or overhanging profile

Authors:Ming, Xianshun (1, 2); Sun, Liqun (2)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy ofSciences (CAS), Xi’an; 710119, China; (2) State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing; 100084, China

Corresponding author:Sun, Liqun(sunlq@mail.tsinghua.edu.cn)

Source title:Applied Optics

Abbreviated source title:Appl. Opt.

Volume:60

Issue:15

Issue date:May 20, 2021

Publication year:2021

Pages:4305-4314

Language:English

ISSN:1559128X

E-ISSN:21553165

CODEN:APOPAI

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">We reformulate the coordinate transformation method (C method) for gratings with a vertical facet or overhanging profile (overhanging gratings), in which no tensor concept is involved, only the knowledge of elementary mathematics and Maxwell’s equations in the rectangular coordinate system is used, and we provide a detailed recipe for programming. This formulation is easy to understand and implement. It adopts the strategy of a rotating coordinate system from Plumey et al. [J. Opt. Soc. Am. A 14, 610 (1997)] and expresses it with the method of changing variables from Li et al. [Appl. Opt. 38, 304 (1999)]. We investigate several typical overhanging gratings by the reformulated C method, and we validate and compare the results with the Fourier modal method, which shows that it is superior, especially for metal deep smooth gratings. This reformulation can facilitate the research in light couplers for optical engineers.<br/></div> © 2021 Optical Society of America

Number of references:34

Main heading:Maxwell equations

Controlled terms:Modal analysis

Uncontrolled terms:C method - Coordinate transformation methods - Fourier modal method - Rectangular coordinates - Rotating coordinate system

Classification code:701.1 Electricity: Basic Concepts and Phenomena - 701.2 Magnetism: Basic Concepts and Phenomena - 921 Mathematics - 921.2 Calculus

DOI:10.1364/AO.423209

Database:Compendex

Accession number:20212810616400

Title:Design of secondary lens focusing mechanism for multispectral camera

Authors:Rui, Wang (1, 2); Xiuqin, Su (1, 3); Yongming, Qiao (1); Tao, Lv (1); Xuan, Wang (1, 2); Kaidi, Wang (1, 2); Yuan, Tian (1, 2)

Author affiliation:(1) Key Laboratory of Space Precision Measurement Technology, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Pilot National Laboratory for Marine Science and Technology, Qingdao; 266237, China

Corresponding author:Rui, Wang(wangrui@opt.cn)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11885

Part number:1 of 1

Issue title:International Conference on Laser, Optics and Optoelectronic Technology, LOPET 2021

Issue date:2021

Publication year:2021

Article number:1188512

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510646162

Document type:Conference article (CA)

Conference name:2021 International Conference on Laser, Optics and Optoelectronic Technology, LOPET 2021

Conference date:May 28, 2021 - May 30, 2021

Conference location:Xi'an, China

Conference code:169930

Sponsor:China Optoelectronics Industry Platform

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">Due to the influence of mechanical environment, large range temperature change and atmospheric pressure, the space multispectral camera has a certain amount of defocus in the optical imaging system. In order to improve the imaging quality of the multispectral camera, if the traditional CAM focusing mechanism is adopted, it is difficult to meet the requirements of high precision focusing for fast response due to its disadvantages such as large volume, poor efficiency and low precision. Therefore, a new focusing mechanism is designed in this paper, which is composed of rhomboid amplifier large piezoelectric ceramic actuator, flexible hinge support structure and high-precision capacitance sensor. The mechanism drives the flexible support guide structure of the parallelogram by means of a rhomboid amplifier large PZT actuator with three points distributed uniformly and symmetrically at 120°, so that the lens base can move in a straight line along the Z direction. The high precision capacitance sensor is used as the feedback element to ensure the focusing accuracy of the mechanism reaches nanometer level. The test results show that the focusing range of this mechanism is ±21.91um, the focusing speed is 438um/s, the focusing precision is 50nm and the tilt error is 1".<br/></div> © 2021 SPIE

Number of references:13

Main heading:Cameras

Controlled terms:Atmospheric pressure - Capacitance - Piezoelectric actuators - Focusing - Piezoelectric ceramics

Uncontrolled terms:Focusing mechanisms - Mechanical environment - Multi-spectral cameras - Optical imaging system - Piezoelectric ceramic actuators - Poor efficiencies - Support structures - Temperature changes

Classification code:443.1 Atmospheric Properties - 701.1 Electricity: Basic Concepts and Phenomena - 704.1 Electric Components - 708.1 Dielectric Materials - 732 Control Devices - 742.2 Photographic Equipment - 812.1 Ceramics

Numerical data indexing:Size 5.00e-08m

DOI:10.1117/12.2602300

Database:Compendex

Accession number:20214711200384

Title:New results on small and dim infrared target detection (Open Access)

Authors:Wang, Hao (1); Zhao, Zehao (1, 2); Kwan, Chiman (3); Zhou, Geqiang (4); Chen, Yaohong (1)

Author affiliation:(1) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Signal Processing, Inc., Rockville; MD; 20850, United States; (4) Astronaut Selection and Training Center, Beijing; 100094, China

Corresponding author:Chen, Yaohong(chenyaohong@opt.ac.cn)

Source title:Sensors

Abbreviated source title:Sensors

Volume:21

Issue:22

Issue date:November-2 2021

Publication year:2021

Article number:7746

Language:English

ISSN:14248220

Document type:Journal article (JA)

Publisher:MDPI

Abstract:<div data-language="eng" data-ev-field="abstract">Real-time small infrared (IR) target detection is critical to the performance of the situa-tional awareness system in high-altitude aircraft. However, current IR target detection systems are generally hardware-unfriendly and have difficulty in achieving a robust performance in datasets with clouds occupying a large proportion of the image background. In this paper, we present new results by using an efficient method that extracts the candidate targets in the pre-processing stage and fuses the local scale, blob-based contrast map and gradient map in the detection stage. We also developed mid-wave infrared (MWIR) and long-wave infrared (LWIR) cameras for data collection experiments and algorithm evaluations. Experimental results using both publicly available datasets and image sequences acquired by our cameras clearly demonstrated that the proposed method achieves high detection accuracy with the mean AUC being at least 22.3% higher than comparable methods, and the computational cost beating the other methods by a large margin.<br/></div> © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Number of references:29

Main heading:Cameras

Controlled terms:Infrared radiation - Aircraft detection - Signal detection - Large dataset

Uncontrolled terms:'current - Awareness systems - Dim infrared target - High-altitude aircrafts - Imaging processing - Infrared target detection - New results - Performance - Real- time - Real-time detection

Classification code:716.1 Information Theory and Signal Processing - 716.2 Radar Systems and Equipment - 723.2 Data Processing and Image Processing - 741.1 Light/Optics - 742.2 Photographic Equipment

Numerical data indexing:Percentage 2.23E+01%

DOI:10.3390/s21227746

Funding details: Number: 51905529, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:National Natural Science Foundation of China under Grant 51905529.

Database:Compendex

Open Access type(s): All Open Access, Gold, Green

Accession number:20214411085315

Title:Development of point diffraction interferometer by a dimension-reduction-based phase-shifting algorithm

Authors:Feng, Leijie (1); Du, Hubing (1); Liu, Chang (1); Han, Jinlu (1); Zhang, Gaopeng (2); Wang, Feng (2); Zhao, Zixin (3); Gao, Fen (1)

Author affiliation:(1) School of Mechatronic Engineering, Xi’an Technological University, Shaanxi, Xi’an; 710032, China; (2) Xi’an Institute of Optics and Precision Mechanics, CAS, Xi’an; 710119, China; (3) State Key Laboratory for Manufacturing Systems Engineering, School of Mechanical Engineering, Xi’an Jiaotong University, Shaanxi, Xi’an; 710049, China

Corresponding author:Du, Hubing(duhubing@xatu.edu.cn)

Source title:Applied Optics

Abbreviated source title:Appl. Opt.

Volume:60

Issue:30

Issue date:October 20, 2021

Publication year:2021

Pages:9440-9446

Language:English

ISSN:1559128X

E-ISSN:21553165

CODEN:APOPAI

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">To avoid exhaustive calibration of the shifter device in point diffraction interferometers, we present a dimension-reduction-based method to reconstruct the phase map from more phase-shifting fringe patterns with three or more frames. The proposed method assumes that the intensity space can be described adequately by the sine and cosine of multiple phase shifts introduced, which are the basis of the intensity space. Then, low-dimensional approximations of high-dimensional intensity spaces are determined by the newly developed reduced basis decomposition technique. Finally, the phase is reconstructed using the low-dimensional surrogates of the intensity spaces without the knowledge of accurate phase steps. Numerical and experimental studies demonstrated that the proposed method outperforms the existing popular phase reconstruction techniques in terms of accuracy and efficiency. Moreover, the performance of the proposed method is not limited by variations in the background and modulation, unlike the existing phase-shifting-algorithm-based approaches.<br/></div> © 2021 Optical Society of America

Number of references:15

Main heading:Diffraction

Controlled terms:Interferometers - Numerical methods

Uncontrolled terms:Dimension reduction - Fringe pattern - High-dimensional - Higher-dimensional - Low-dimensional approximation - Phase maps - Phase-shifting - Phase-shifting algorithm - Point diffraction interferometer - Reduced basis

Classification code:921.6 Numerical Methods - 941.3 Optical Instruments

DOI:10.1364/AO.439512

Funding details: Number: 2021GY-274, Acronym: -, Sponsor: -;Number: 51905529,51975448,52005383, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:Funding. National Natural Science Foundation of China (51975448, 51905529, 52005383); Key R & D Plan of Shaanxi Province (2021GY-274).

Database:Compendex

Accession number:20212610550244

Title:A four-channel ICCD framing camera with nanosecond temporal resolution and high spatial resolution

Authors:Fang, Yuman (1, 2); Zhang, Minrui (1); Wang, Junfeng (1); Guo, Lehui (1, 2); Liu, Xueling (1, 2); Lu, Yu (1); Tian, Jinshou (1, 3)

Author affiliation:(1) Key Laboratory of Ultra-fast Photoelectric Diagnostics Technology, Xi'an Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences (CAS), Xi'an, China; (2) College of Materials Science and Opto-electronic Technology, University of Chinese Academy of Sciences, Beijing, China; (3) Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, China

Corresponding author:Tian, Jinshou(tianjs@opt.ac.cn)

Source title:Journal of Modern Optics

Abbreviated source title:J. Mod. Opt.

Volume:68

Issue:13

Issue date:2021

Publication year:2021

Pages:661-669

Language:English

ISSN:09500340

E-ISSN:13623044

CODEN:JMOPEW

Document type:Journal article (JA)

Publisher:Taylor and Francis Ltd.

Abstract:<div data-language="eng" data-ev-field="abstract">In this paper, a high spatial resolution, high gating speed framing camera capable of four separate two-dimensional images is designed and tested. A mirror-based image splitter has been designed and developed to provide a separate image for each arm with equal path length and equal intensity splitting while having a spectral flat response. Fast gating of a single frame is accomplished by using a proximity-focused microchannle-plate image-intensifier (MCPII) gated by a MOSFET-based pulse module with adjustable gate width from 3 ns to D.C. operation. Multiple frames are obtained by using multiple gated tubes with time intervals between consecutive frames can be adjusted flexibly. Its spatial resolution reaches 36.5 lp/mm with each frame having a 4.6-ns gate width. Furthermore, a three-dimensional MCPII model is developed to investigate the transit time and spatial resolution of the proximity-focused MCPII based on the Finite Integral Technique (FIT) and Monte Carlo method (M–C method).<br/></div> © 2021 Informa UK Limited, trading as Taylor & Francis Group.

Number of references:17

Main heading:Mirrors

Controlled terms:Cameras - Monte Carlo methods - MOSFET devices - Image resolution

Uncontrolled terms:Finite integral techniques - Framing Camera - High spatial resolution - Image splitters - Multiple-frame - Spatial resolution - Temporal resolution - Two dimensional images

Classification code:714.2 Semiconductor Devices and Integrated Circuits - 741.3 Optical Devices and Systems - 742.2 Photographic Equipment - 922.2 Mathematical Statistics

Numerical data indexing:Time 4.60e-09s

DOI:10.1080/09500340.2021.1937735

Database:Compendex

Accession number:20210509853124

Title:Precise dynamic characterization of microcombs assisted by an RF spectrum analyzer with THz bandwidth and MHz resolution (Open Access)

Authors:Wang, Ruolan (1); Chen, Liao (1); Hu, Hao (1); Zhao, Yanjing (1); Zhang, Chi (1); Zhang, Wenfu (2); Zhang, Xinliang (1)

Author affiliation:(1) Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan; 430074, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and PrecisionMechanics (XIOPM), Chinese Academy of Science (CAS), Xi’an; 710119, China

Source title:Optics Express

Abbreviated source title:Opt. Express

Volume:29

Issue:2

Issue date:January 18, 2021

Publication year:2021

Pages:2153-2161

Language:English

E-ISSN:10944087

Document type:Journal article (JA)

Publisher:OSA - The Optical Society

Abstract:The radio frequency (RF) spectrum of microcombs can be used to evaluate its phase noise features and coherence between microcomb teeth. Since microcombs possess characteristics such as high repetition rate, narrow linewidth and ultrafast dynamical evolution, there exists strict requirement on the bandwidth, resolution and frame rate of RF measurement system. In this work, a scheme with 1.8-THz bandwidth, 7.5-MHz spectral resolution, and 100-Hz frame rate is presented for RF spectrum measurement of microcombs by using an all-optical RF spectrum analyzer based on cross-phase modulation and Fabry Perot (FP) spectrometer, namely FP-assisted light intensity spectrum analyzer (FP-assisted LISA). However, extra dispersion introduced by amplifying the microcombs will deteriorate the bandwidth performance of measured RF spectrum. After compensating the extra dispersion through monitoring the dispersion curves measured by FP-assisted LISA, the more precise RF spectra of microcombs are measured. Then, the system is used to measure the noise sidebands and line shape evolution of microcombs within 2s temporal window, in which dynamic RF combs variation at different harmonic frequencies up to 1.96 THz in modulation instability (MI) state and soliton state are recorded firstly. Therefore, the improved bandwidth and resolution of FP-assisted LISA enable more precise measurement of RF spectrum, paving a reliable way for researches on physical mechanism of microcombs.<br/> © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Number of references:24

Main heading:Spectrum analyzers

Controlled terms:Dispersions - Modulation - Phase noise - Dynamics - Dispersion (waves) - Fabry-Perot interferometers - Bandwidth

Uncontrolled terms:All-optical RF-spectrum analyzers - Bandwidth and resolutions - Bandwidth performance - Cross phase modulation - Dynamic characterization - High repetition rate - Modulation instabilities - Radio frequency spectrum

Classification code:701.2 Magnetism: Basic Concepts and Phenomena - 716.1 Information Theory and Signal Processing - 941.3 Optical Instruments - 951 Materials Science

Numerical data indexing:Frequency 1.00e+02Hz, Frequency 1.80e+12Hz, Frequency 1.96e+12Hz, Frequency 7.50e+06Hz, Time 2.00e+00s

DOI:10.1364/OE.415933

Funding details: Number: 61505060,61631166003,61675081,61735006,61927817, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2018M640692, Acronym: -, Sponsor: China Postdoctoral Science Foundation;Number: 2019YFB2203102, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Funding text:Funding. National Natural Science Foundation of China (61505060, 61631166003, 61675081, 61735006, 61927817); National Key Research and Development Program of China (2019YFB2203102); China Postdoctoral Science Foundation (2018M640692).

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20210062335

Title:Serial-parallel multi-scale feature fusion for anatomy-oriented hand joint detection

Authors:Li, Bin (1); Fu, Hong (2); Li, Ruimin (3); Wang, Wendi (4)

Author affiliation:(1) School of Information Science and Technology, Northwest University, Xi’an; 710127, China; (2) Department of Mathematics and Information Technology, The Education University of Hong Kong, Hong Kong; (3) Xi’an Institute of Optics and Precision Mechanics, CAS, Xi’an; 710119, China; (4) Shanghai University of Engineering Science, China

Corresponding author:Fu, Hong(hfu@eduhk.hk)

Source title:arXiv

Abbreviated source title:arXiv

Issue date:February 19, 2021

Publication year:2021

Language:English

E-ISSN:23318422

Document type:Preprint (PP)

Publisher:arXiv

Abstract:<div data-language="eng" data-ev-field="abstract">Accurate hand joints detection from images is a fundamental topic which is essential for many applications in computer vision and human computer interaction. This paper presents a two-stage network for hand joints detection from single unmarked image by using serial-parallel multi-scale feature fusion. In stage I, the hand regions are located by a pre-trained network, and the features of each detected hand region are extracted by a shallow spatial hand features representation module. The extracted hand features are then fed into stage II, which consists of serially connected feature extraction modules with similar structures, called "multi-scale feature fusion" (MSFF). A MSFF contains parallel multi-scale feature extraction branches, which generate initial hand joint heatmaps. The initial heatmaps are then mutually reinforced by the anatomic relationship between hand joints. The experimental results on five hand joints datasets show that the proposed network overperforms the state-of-the-art methods.<br/></div> © 2021, CC BY-NC-SA.

Number of references:46

Main heading:Extraction

Controlled terms:Feature extraction - Human computer interaction - Palmprint recognition

Uncontrolled terms:Features extraction - Features fusions - Hand joint detection - Heatmaps - Joint-detection - Loss-wise mechanism - Multi-scale features - Multi-scale structures - Parallel-cascade multiscale structure - Serial parallels

Classification code:723.5 Computer Applications - 802.3 Chemical Operations

Database:Compendex

Preprint source website:https://arxiv.org

Preprint ID type:ARXIV

Accession number:20211210104091

Title:Antireflective and superhydrophilic structure on graphite written by femtosecond laser (Open Access)

Authors:Lou, Rui (1, 2); Li, Guangying (1, 2); Wang, Xu (1); Zhang, Wenfu (1); Wang, Yishan (1); Zhang, Guodong (3); Wang, Jiang (3); Cheng, Guanghua (3)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics of CAS, Xi’an; 710119, China; (2) School of Future Technology, University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Electronic Information College, Northwestern Polytechnical University, Xi’an; 710072, China

Corresponding author:Cheng, Guanghua(guanghuacheng@nwpu.edu.cn)

Source title:Micromachines

Abbreviated source title:Micromachines

Volume:12

Issue:3

Issue date:March 2021

Publication year:2021

Pages:1-11

Article number:236

Language:English

E-ISSN:2072666X

Document type:Journal article (JA)

Publisher:MDPI AG

Abstract:Antireflection and superhydrophilicity performance are desirable for improving the properties of electronic devices. Here, we experimentally provide a strategy of femtosecond laser preparation to create micro-nanostructures on the graphite surface in an air environment. The modified graphite surface is covered with abundant micro-nano structures, and its average reflectance is measured to be 2.7% in the ultraviolet, visible and near-infrared regions (250 to 2250 nm). The wettability transformation of the surface from hydrophilicity to superhydrophilicity is realized. Besides, graphene oxide (GO) and graphene are proved to be formed on the sample surface. This micro-nanostructuring method, which demonstrates features of high efficiency, high controllability, and hazardous substances zero discharge, exhibits the application for functional surface.<br/> © MDPI AG. All rights reserved.

Number of references:50

Main heading:Femtosecond lasers

Controlled terms:Graphite - Infrared devices - Nanostructures - Graphene - Hydrophilicity

Uncontrolled terms:Electronic device - Functional surfaces - Graphite surfaces - Hazardous substances - Micro-nano structures - Modified graphites - Superhydrophilic structures - Visible and near infrared

Classification code:744.1 Lasers, General - 761 Nanotechnology - 804 Chemical Products Generally - 933 Solid State Physics

Numerical data indexing:Percentage 2.70e+00%, Size 2.50e-07m to 2.25e-06m

DOI:10.3390/mi12030236

Funding text:Funding: This research was funded by the National Key Research and Development Program (2018YFB1107401) and Natural National Science Foundation of China (NSFC) (61775236).

Database:Compendex

Open Access type(s): All Open Access, Gold, Green

Accession number:20212710589837

Title:Collective energy-spectrum broadening of a proton beam in a gas-discharge plasma

Authors:Cheng, Rui (1, 6, 7); Hu, Zhang-Hu (2); Hui, De-Xuan (2); Zhao, Yong-Tao (1, 3); Chen, Yan-Hong (1); Gao, Fei (2); Lei, Yu (1); Wang, Yu-Yu (1); Zhu, Bing-Li (4); Yang, Yang (4); Wang, Zhao (1, 5); Zhou, Ze-Xian (1, 5); Wang, You-Nian (2); Yang, Jie (1)

Author affiliation:(1) Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou; 730000, China; (2) School of Physics, Dalian University of Technology, Dalian; 116024, China; (3) MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, School of Physics, Xi'An Jiaotong University, Xi'an; 710049, China; (4) Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710049, China; (5) College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou; 730000, China; (6) University of Chinese Academy of Sciences, Beijing; 100049, China; (7) Advanced Energy Science and Technology Guangdong Laboratory, Huizhou; 516003, China

Corresponding author:Hu, Zhang-Hu(zhanghu@dlut.edu.cn)

Source title:Physical Review E

Abbreviated source title:Phys. Rev. E

Volume:103

Issue:6

Issue date:June 2021

Publication year:2021

Article number:063216

Language:English

ISSN:24700045

E-ISSN:24700053

Document type:Journal article (JA)

Publisher:American Physical Society

Abstract:<div data-language="eng" data-ev-field="abstract">An accurate understanding of ion-beam transport in plasmas is crucial for applications in inertial fusion energy and high-energy-density physics. We present an experimental measurement on the energy spectrum of a proton beam at 270 keV propagating through a gas-discharge hydrogen plasma. We observe the energies of the beam protons changing as a function of the plasma density and spectrum broadening due to a collective beam-plasma interaction. Supported by linear theory and three-dimensional particle-in-cell simulations, we attribute this energy modulation to a two-stream instability excitation and further saturation by beam ion trapping in the wave. The widths of the energy spectrum from both experiment and simulation agree with the theory.<br/></div> © 2021 American Physical Society.

Number of references:25

Main heading:Proton beams

Controlled terms:Plasma simulation - Spectroscopy - Beam plasma interactions - Ion beams - Electric discharges - Plasma density

Uncontrolled terms:Energy modulation - Gas-discharge plasmas - High energy density physics - Inertial fusion energy - Ion beam transport - Spectrum broadening - Three dimensional particle-in-cell simulations - Two stream instability

Classification code:701.1 Electricity: Basic Concepts and Phenomena - 932.1 High Energy Physics - 932.3 Plasma Physics

Numerical data indexing:Electron_Volt 2.70e+05eV

DOI:10.1103/PhysRevE.103.063216

Funding details: Number: 11775042,11775278,11875096,12075046,U1532263,U1832175, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2017YFA0402300, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Funding text:This work was supported by the National Key R&D Program of China (Grant No. 2017YFA0402300), and National Natural Science Foundation of China (No. 11775042, No. 11775278, No. 11875096, No. 12075046, No. U1532263, and No. U1832175).

Database:Compendex

Accession number:20213910957797

Title:Demonstration of an external cavity semiconductor mode-locked laser

Authors:Yuan, Meiyan (1, 2); Wang, Weiqiang (1); Wang, Xinyu (1, 2); Wang, Yang (1, 2); Yang, Qinghua (3); Cheng, Dong (1, 2); Liu, Yang (1, 2); Huang, Long (1, 2); Zhang, Mingran (1, 2); Liang, Bo (1, 2); Zhao, Wei (1, 2); Zhang, Wenfu (1, 2)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences (CAS), Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) School of Physics and Optoelectronic Engineering, Xidian University, Xi’an; 710071, China

Source title:Optics Letters

Abbreviated source title:Opt. Lett.

Volume:46

Issue:19

Issue date:October 1, 2021

Publication year:2021

Pages:4855-4858

Language:English

ISSN:01469592

E-ISSN:15394794

CODEN:OPLEDP

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">Electrically pumped semiconductor mode-locked lasers (SMLs) are promising in a wide range of applications due to compact size, high energy efficiency, and low cost. However, the long gain interaction length increases the spontaneous emission noise. In this Letter, an external cavity structure is adopted to improve the SML noise performance, as well as the flexibility to adjust the repetition rate. Two external cavity SMLs with repetition rates of 255 MHz and 10 GHz are demonstrated. For the 10 GHz SML, the signal-noise-ratio and radio frequency linewidth of the fundamental frequency reach 81.1 dB and 40 Hz, respectively. The high performance makes the laser a promising light source for microwave and communication applications.<br/></div> © 2021 Optical Society of America

Number of references:36

Main heading:Pumping (laser)

Controlled terms:Energy efficiency - Semiconductor lasers

Uncontrolled terms:Cavity structure - Compact size - Electrically-pumped - External cavity - High energy efficiency - Interaction length - Low-costs - Repetition rate - Semiconductor mode-locked laser - Spontaneous emission noise

Classification code:525.2 Energy Conservation - 744.1 Lasers, General - 744.4.1 Semiconductor Lasers

Numerical data indexing:Decibel 8.11E+01dB, Frequency 1.00E+10Hz, Frequency 2.55E+08Hz, Frequency 4.00E+01Hz

DOI:10.1364/OL.428794

Funding details: Number: 62075238, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: E0291113,XDB24030600, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: -, Acronym: -, Sponsor: West Light Foundation of the Chinese Academy of Sciences;

Funding text:Funding. National Natural Science Foundation of China (62075238); West Light Foundation of the Chinese Academy of Sciences (E0291113); Strategic Priority Research Program of the Chinese Academy of Sciences (XDB24030600).

Database:Compendex

Accession number:20210209763503

Title:Controlled asymmetric bidirectional quantum teleportation of two- and three-qubit states

Authors:Huo, Guangwen (1); Zhang, Tongyi (2); Zha, Xinwei (3); Zhang, Xiuxing (1); Zhang, Meizhi (3)

Author affiliation:(1) School of Mathematics and Physics, Weinan Normal University, Weinan; 714099, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (3) School of Electronics Engineering, Xi’an University of Posts and Telecommunications, Xi’an; 710121, China

Corresponding author:Huo, Guangwen(guangwenhuo@126.com)

Source title:Quantum Information Processing

Abbreviated source title:Quantum Inf. Process.

Volume:20

Issue:1

Issue date:January 2021

Publication year:2021

Article number:24

Language:English

ISSN:15700755

E-ISSN:15731332

Document type:Journal article (JA)

Publisher:Springer

Abstract:We propose a protocol of asymmetric controlled bidirectional quantum teleportation of two- and three-qubit states. That is to say, Alice wants to teleport an arbitrary two-qubit state to Bob, and Bob wants to teleport an arbitrary three-qubit state for Alice via the control of supervisor Charlie. By using the eleven-qubit entangled state as the quantum channel, Alice can teleport an arbitrary two-qubit state for Bob and Bob can teleport an arbitrary three-qubit state for Alice simultaneously.<br/> © 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC part of Springer Nature.

Number of references:20

Main heading:Quantum entanglement

Controlled terms:Qubits

Uncontrolled terms:Quantum teleportation - Qubit entangled state - Qubit state - Two-qubit state

Classification code:741 Light, Optics and Optical Devices - 761 Nanotechnology - 931.4 Quantum Theory; Quantum Mechanics

DOI:10.1007/s11128-020-02956-3

Funding details: Number: 61475191,61875228, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: -, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;Number: 2019RC3, Acronym: WNU, Sponsor: Weinan Normal University;Number: 2017ZDJC-27, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;

Funding text:This work was supported by National Natural Science Foundation of China (Grant Nos. 61875228, 61475191), Natural Science Basic Research Plan in Shaanxi Province of China (2017ZDJC-27), and Weinan Normal University Research Foundation for Talented Scholars (2019RC3).This work was supported by National Natural Science Foundation of China (Grant Nos. 61875228, 61475191), Natural Science Basic Research Plan in Shaanxi Province of China (2017ZDJC-27), and Weinan Normal University Research Foundation for Talented Scholars (2019RC3).

Database:Compendex

Accession number:20210109715973

Title:An uncoupled theory of FG nanobeams with the small size effects and its exact solutions

Authors:Pei, Y.L. (1, 2); Li, L.X. (1)

Author affiliation:(1) State Key Laboratory for Strength and Vibration of Mechanical Structures, Shaanxi Key Laboratory of Environment and Control for Flight Vehicle, School of Aerospace Engineering, Xi’an Jiaotong University, Xi’an; Shaanxi; 710049, China; (2) Xi’an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi’an; Shaanxi; 710119, China

Corresponding author:Li, L.X.(luxianli@mail.xjtu.edu.cn)

Source title:Archive of Applied Mechanics

Abbreviated source title:Arch Appl Mech

Volume:91

Issue:4

Issue date:April 2021

Publication year:2021

Pages:1713-1728

Language:English

ISSN:09391533

E-ISSN:14320681

CODEN:AAMEEA

Document type:Journal article (JA)

Publisher:Springer Science and Business Media Deutschland GmbH

Abstract:<div data-language="eng" data-ev-field="abstract">Due to unphysical coupling induced by the material inhomogeneity, FG (functionally graded) nanobeam problems were formulated in a very complex way so that they cannot be analytically solved. In this paper, an uncoupled theory is proposed for FG nanobeams considering their small size effects. First, with the aid of the neutral axis, the axial displacement is expressed in terms of generalized displacements for FG nanobeams. Based on the nonlocal strain gradient theory, the generalized stresses and strains are accordingly defined and uncoupled constitutive relations are derived. Based on the principle of virtual work, an uncoupled theory is eventually established, including governing equations and boundary conditions. Within the present framework, analytical solutions to FG nanobeams are obtained for the first time for general boundary conditions. These solutions not only re-evaluate the previous results but shed light on the small size effects of FG nanobeams.<br/></div> © 2021, Springer-Verlag GmbH Germany, part of Springer Nature.

Number of references:54

Main heading:Boundary conditions

Controlled terms:Structural design - Size determination - Elasticity - Nanowires - Strain

Uncontrolled terms:Axial displacements - Constitutive relations - Functionally graded - General boundary conditions - Generalized displacements - Material inhomogeneity - Principle of virtual work - Strain gradient theory

Classification code:408.1 Structural Design, General - 761 Nanotechnology - 933 Solid State Physics - 951 Materials Science

DOI:10.1007/s00419-020-01849-2

Funding details: Number: 11672221,U20B2013, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:This work was supported by the National Natural Science Foundations of China (Grant Nos: U20B2013 and 11672221).

Database:Compendex

Accession number:20220411518346

Title:Generation of densely-spaced time-bin entangled qubits on a chip

Authors:Chemnitz, Mario (1); Sciara, Stefania (1); Fischer, Bennet (1); Crockett, Benjamin (1); Roztocki, Piotr (1); Yu, Hao (2); Wang, Zhiming (2); Morandotti, Roberto (3); Little, Brent E. (3); Chu, Sai T. (4); Moss, David J. (5)

Author affiliation:(1) INRS-EMT, Varennes, Canada; (2) Institute of Fundamental and Frontier Sciences, University of Science and Technology of China, Chengdu, China; (3) State Key Laboratory of Transient Optics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Science, Xi'an, China; (4) City University of Hong Kong, Department of Physics, Hong Kong, Hong Kong; (5) Optical Sciences Centre Swinburne University of Technology, Hawthorn, Australia

Corresponding author:Yu, Hao(Hao.Yu@inrs.ca)

Source title:2021 Photonics North, PN 2021

Abbreviated source title:Photonics North, PN

Part number:1 of 1

Issue title:2021 Photonics North, PN 2021

Issue date:2021

Publication year:2021

Language:English

ISBN-13:9781665444835

Document type:Conference article (CA)

Conference name:2021 Photonics North, PN 2021

Conference date:May 31, 2021 - June 2, 2021

Conference location:Toronto, ON, Canada

Conference code:174283

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">We present a compact scheme for the integrated generation of densely-spaced time-bin entangled two-photon qubits using an on-chip unbalanced interferometer and a spiral waveguide. We show quantum interference with visibilities as high as 99%.<br/></div> © 2021 IEEE.

Number of references:6

Main heading:Quantum entanglement

Controlled terms:Photonics - Qubits - Interferometers

Uncontrolled terms:Compact schemes - Entangled qubits - Integrated quantum photonic - On chips - On-chip mach-zehnde interferometer - Photon qubits - Quantum photonics - Spiral waveguides - Time-bin entanglement - Two photon

Classification code:741 Light, Optics and Optical Devices - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 761 Nanotechnology - 931.4 Quantum Theory; Quantum Mechanics - 941.3 Optical Instruments

Numerical data indexing:Percentage 9.90E+01%

DOI:10.1109/PN52152.2021.9598004

Database:Compendex

Accession number:20213310764473

Title:Research on Deep Learning Denoising Method in an Ultra-Fast All-Optical Solid-State Framing Camera

Authors:Zhou, Jian (1); Wang, Zhuping (2); Wang, Tao (3); Yang, Qing (4); Wen, Keyao (3); Yan, Xin (3); He, Kai (3); Gao, Guilong (3); Yao, Dong (3); Yin, Fei (3, 4)

Author affiliation:(1) Xi’an Modern Control Technology Research Institute, Xi’an; 710065, China; (2) Xi’an Institute of Electromechanical Information Technology, Xi’an; 710065, China; (3) Key Laboratory of Ultra-Fast Photoelectric Diagnostics Technology, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (4) School of Mechanical Engineering, Xi’an Jiaotong University, Shaanxi, Xi’an; 710049, China

Corresponding author:Yin, Fei(yinfei@opt.ac.cn)

Source title:Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)

Abbreviated source title:Lect. Notes Comput. Sci.

Volume:12736 LNCS

Part number:1 of 2

Issue title:Artificial Intelligence and Security - 7th International Conference, ICAIS 2021, Proceedings

Issue date:2021

Publication year:2021

Pages:78-85

Language:English

ISSN:03029743

E-ISSN:16113349

ISBN-13:9783030786083

Document type:Conference article (CA)

Conference name:7th International Conference on Artificial Intelligence and Security, ICAIS 2021

Conference date:July 19, 2021 - July 23, 2021

Conference location:Dublin, Ireland

Conference code:262659

Publisher:Springer Science and Business Media Deutschland GmbH

Abstract:<div data-language="eng" data-ev-field="abstract">The ultra-fast all-optical solid-state framing camera (UASFC) is a new type of X-ray ultra-fast diagnostic technology. It uses X-ray excitation to change the refractive index distribution of the ultra-fast detection chip, and time-tuned multi-wavelength probe light for ultra-fast detection on the order of picoseconds or less. Due to the uneven intensity of the probe light wavelength and spatial diffraction, the noise of the detection image is too high, which directly affects the spatial and temporal resolution of the system. To improve the detection performance of the UASFC system, we adopted NLM image optimization technology based on a convolutional neural network, using 50 shots of the reticle image as the learning set and iterating the weight of the NLM image optimization filter. The CCD image obtained by the four-channel wavelength spectroscopy system is noise-reduced and optimized, which greatly improves the image contrast and edge definition, reduces image noise, and further improves the time and space resolution of the UASFC system.<br/></div> © 2021, Springer Nature Switzerland AG.

Number of references:17

Main heading:Deep learning

Controlled terms:Convolution - Convolutional neural networks - Cameras - Image resolution - Probes - Image enhancement - Refractive index - Learning systems

Uncontrolled terms:Detection performance - Diagnostic technologies - Image optimization - Multi-wavelengths - Refractive-index distribution - Space resolutions - Spatial and temporal resolutions - Spatial diffraction

Classification code:461.4 Ergonomics and Human Factors Engineering - 716.1 Information Theory and Signal Processing - 741.1 Light/Optics - 742.2 Photographic Equipment

DOI:10.1007/978-3-030-78609-0_7

Database:Compendex

Accession number:20210409829936

Title:Rapid Image Reconstruction of Structured Illumination Microscopy Directly in the Spatial Domain (Open Access)

Authors:Dan, Dan (1); Wang, Zhaojun (1); Zhou, Xing (1); Lei, Ming (1, 2); Zhao, Tianyu (1); Qian, Jia (1); Yu, Xianghua (1); Yan, Shaohui (1); Min, Junwei (1); Bianco, Piero R. (3); Yao, Baoli (1)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi an; 710119, China; (2) Xi an Jiaotong University, Xi an; 710049, China; (3) Department of Pharmaceutical Sciences, College of Pharmacy, University of Nebraska Medical Center, Omaha; NE; 68198, United States

Corresponding author:Yao, Baoli(yaobl@opt.ac.cn)

Source title:IEEE Photonics Journal

Abbreviated source title:IEEE Photon. J.

Volume:13

Issue:1

Issue date:February 2021

Publication year:2021

Article number:9329035

Language:English

E-ISSN:19430655

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:Super-resolution structured illumination microscopy (SIM) routinely performs image reconstruction in the frequency domain using an approach termed frequency-domain reconstruction (FDR). Due to multiple Fourier transforms between the spatial and frequency domains, SIM suffers from low reconstruction speed, constraining its applications in real-time, dynamic imaging. To overcome this limitation, we developed a new method for SIM image reconstruction, termed spatial domain reconstruction (SDR). SDR is intrinsically simpler than FDR, does not require Fourier transforms and the theory predicts it to be a rapid image reconstruction method. Results show that SDR reconstructs a super-resolution image 7-fold faster than FDR, producing images that are equal to either FDR or the widely-used FairSIM. We provide a proof-of-principle using mobile fluorescent beads to demonstrate the utility of SDR in imaging moving objects. Consequently, replacement of the FDR approach with SDR significantly enhances SIM as the desired method for live-cell, instant super-resolution imaging. This means that SDR-SIM is a 'What You See Is What You Get' approach to super-resolution imaging.<br/> © 2009-2012 IEEE.

Number of references:31

Main heading:Image reconstruction

Controlled terms:Fourier transforms - Frequency domain analysis - Optical resolving power

Uncontrolled terms:Frequency domains - Image reconstruction methods - Proof of principles - Reconstruction speed - Spatial and frequency domain - Structured illumination microscopies (SIM) - Structured illumination microscopy - Super resolution imaging

Classification code:741.1 Light/Optics - 921.3 Mathematical Transformations

DOI:10.1109/JPHOT.2021.3053110

Funding details: Number: GM10056, Acronym: NIH, Sponsor: National Institutes of Health;Number: 11474352,61522511,81427802,91750106, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2017YFC0110100, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Funding text:Manuscript received December 11, 2020; revised January 13, 2021; accepted January 15, 2021. Date of publication January 20, 2021; date of current version February 8, 2021. This work was supported in part by the Natural Science Foundation of China under Grants 91750106, 81427802, 61522511, and 11474352, and in part by the National Key Research and Development Program of China under Grant 2017YFC0110100, and NIH Grant GM10056 to PRB. Corresponding author: Baoli Yao (e-mail: yaobl@opt.ac.cn).

Database:Compendex

Open Access type(s): All Open Access, Gold, Green

Accession number:20210209754479

Title:Program-controlled single soliton microcomb source

Authors:Wang, Xinyu (1, 2); Xie, Peng (1, 2); Wang, Weiqiang (1, 2); Wang, Yang (1, 2); Lu, Zhizhou (1, 2); Wang, Leiran (1, 2); Chu, Sai T. (3); Little, Brent E. (1, 2); Zhao, Wei (1, 2); Zhang, Wenfu (1, 2)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences (CAS), Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Department of Physics and Materials Science, City University of Hong Kong, Hong Kong, Hong Kong

Source title:Photonics Research

Abbreviated source title:Photon. Res.

Volume:9

Issue:1

Issue date:January 1, 2021

Publication year:2021

Pages:66-72

Language:English

ISSN:23279125

Document type:Journal article (JA)

Publisher:OSA - The Optical Society

Abstract:Soliton microcombs (SMCs) are spontaneously formed in a coherently pumped high-quality microresonator, which provides a new tool for use as an on-chip frequency comb for applications of high-precision metrology and spectroscopy. However, generation of SMCs seriously relies on advanced experimental techniques from professional scientists. Here, we experimentally demonstrate a program-controlled single SMC source where the intracavity thermal effect is timely balanced using an auxiliary laser during single SMC generation. The microcomb power is adopted as the criteria for microcomb states discrimination and a forward and backward thermal tuning technique is employed for the deterministic single SMC generation. Further, based on a closed-loop control system, the repetition rate stability of the SMC source improved more than 20 times and the pump frequency can be continuously tuned by simply changing the operation temperature. The reliability of the SMC source is verified by consecutive 200 generation trials and maintaining over 10 h. We believe the proposed SMC source will have significant promising influences in future SMC-based application development.<br/> © 2020 Chinese Laser Press

Number of references:43

Main heading:Solitons

Controlled terms:Closed loop control systems - Microresonators

Uncontrolled terms:Application development - Experimental techniques - Forward-and-backward - Micro resonators - Operation temperature - Pump frequency - Repetition rate - Single soliton

Classification code:731.1 Control Systems - 741.1 Light/Optics - 744.7 Laser Components - 961 Systems Science

Numerical data indexing:Time 3.60e+04s

DOI:10.1364/PRJ.408612

Funding details: Number: 61635013,61675231, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: XDB24030600, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2019YFA0308200, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Funding text:Funding. National Natural Science Foundation of China (61635013, 61675231); National Key Research and Development Program of China (2019YFA0308200); Strategic Priority Research Program of the Chinese Academy of Sciences (XDB24030600).

Database:Compendex

Accession number:20210104564

Title:Stable and oscillating solitons of PT -symmetric couplers with gain and loss in fractional dimension

Authors:Zeng, Liangwei (1, 2); Shi, Jincheng (3); Lu, Xiaowei (1, 2); Cai, Yi (1, 2); Zhu, Qifan (1, 2); Chen, Hongyi (1, 2); Long, Hu (1, 2); Li, Jingzhen (1, 2)

Author affiliation:(1) College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen; 518060, China; (2) Shenzhen Key Laboratory of Micro-Nano Photonic Information Technology, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen; 518060, China; (3) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China

Corresponding authors:Lu, Xiaowei(xiaoweilu@szu.edu.cn); Li, Jingzhen(lijz@szu.edu.cn)

Source title:arXiv

Abbreviated source title:arXiv

Issue date:April 14, 2021

Publication year:2021

Language:English

E-ISSN:23318422

Document type:Preprint (PP)

Publisher:arXiv

Abstract:<div data-language="eng" data-ev-field="abstract">Families of coupled solitons of PT -symmetric physical models with gain and loss in fractional dimension and in settings with and without cross-interactions modulation (CIM), are reported. Profiles, powers, stability areas, and propagation dynamics of the obtained PT -symmetric coupled solitons are investigated. By comparing the results of the models with and without CIM, we find that the stability area of the model with CIM is much broader than the one without CIM. Remarkably, oscillating PT -symmetric coupled solitons can also exist in the model of CIM with the same coefficients of the self- and cross-interactions modulations. In addition, the period of these oscillating coupled solitons can be controlled by the linear coupling coefficient.<br/></div> Copyright © 2021, The Authors. All rights reserved.

Number of references:85

Main heading:Solitons

Controlled terms:Modulation

Uncontrolled terms:Coupling coefficient - Cross interactions - Linear-coupling - Physical modelling - Power stability - Profile power - Propagation dynamics - Self-interactions - Symmetric couplers - Symmetrics

Database:Compendex

Preprint source website:https://arxiv.org

Preprint ID type:ARXIV

Accession number:20211410180809

Title:Recent advances in structured illumination microscopy (Open Access)

Authors:Ma, Ying (1); Wen, Kai (1); Liu, Min (1); Zheng, Juanjuan (1); Chu, Kaiqin (2); Smith, Zachary J. (2); Liu, Lixin (1); Gao, Peng (1)

Author affiliation:(1) School of Physics and Optoelectronic Engineering, Xidian University, Xi'an; 710071, China; (2) Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei; 230026, China

Corresponding authors:Gao, Peng(peng.gao@xidian.edu.cn); Chu, Kaiqin(kqchu@ustc.edu.cn)

Source title:JPhys Photonics

Abbreviated source title:JPhys photonics

Volume:3

Issue:2

Issue date:April 2021

Publication year:2021

Article number:024009

Language:English

E-ISSN:25157647

Document type:Journal article (JA)

Publisher:IOP Publishing Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">Structured illumination microscopy (SIM), is a wide-field, minimally-invasive super-resolution optical imaging approach with optical sectioning capability, and it has been extensively applied to many different fields. During the past decades, SIM has been drawing great attention for both the technique development and applications. In this review, firstly, the basic conception, instrumentation, and functionalities of SIM are introduced concisely. Secondly, recent advances in SIM which enhance SIM in different aspects are reviewed. Finally, the variants of SIM are summarized and the outlooks and perspectives of SIM are presented.<br/></div> © 2021 The Author(s).

Number of references:96

Main heading:Optical resolving power

Controlled terms:Optical microscopy - Diffraction

Uncontrolled terms:Minimally invasive - Optical imaging - Optical sectioning - Structured illumination microscopies (SIM) - Structured illumination microscopy - Super resolution - Technique development - Wide field

Classification code:741.1 Light/Optics

DOI:10.1088/2515-7647/abdb04

Funding details: Number: -, Acronym: -, Sponsor: Higher Education Discipline Innovation Project;Number: 2017M610623, Acronym: -, Sponsor: China Postdoctoral Science Foundation;Number: 2020JM-193, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;Number: 2020JQ-324, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;Number: 62075177, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: SKLST201804, Acronym: -, Sponsor: State Key Laboratory of Transient Optics and Photonics;Number: XJS190508, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;Number: XJS210503, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;

Funding text:This work was supported by the National Natural Science Foundation of China (NSFC 62075177); the Natural Science Foundation of Shaanxi Province (2020JM-193 and 2020JQ-324), China Postdoctoral Science Foundation (2017M610623), the 111 Project, the Open Research Fund of State Key Laboratory of Transient Optics and Photonics (SKLST201804) and the Fundamental Research Funds for the Central Universities (XJS210503 and XJS190508).

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20210609898775

Title:Stable and oscillating solitons of PT -symmetric couplers with gain and loss in fractional dimension (Open Access)

Authors:Zeng, Liangwei (1, 2); Shi, Jincheng (3); Lu, Xiaowei (1, 2); Cai, Yi (1, 2); Zhu, Qifan (1, 2); Chen, Hongyi (1, 2); Long, Hu (1, 2); Li, Jingzhen (1, 2)

Author affiliation:(1) College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen; 518060, China; (2) Shenzhen Key Laboratory of Micro-Nano Photonic Information Technology, College of Physics and Optoelectronics Engineering, Shenzhen University, Shenzhen; 518060, China; (3) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi’an; 710119, China

Corresponding authors:Lu, Xiaowei(xiaoweilu@szu.edu.cn); Li, Jingzhen(lijz@szu.edu.cn)

Source title:Nonlinear Dynamics

Abbreviated source title:Nonlinear Dyn

Volume:103

Issue:2

Issue date:January 2021

Publication year:2021

Pages:1831-1840

Language:English

ISSN:0924090X

E-ISSN:1573269X

CODEN:NODYES

Document type:Journal article (JA)

Publisher:Springer Science and Business Media B.V.

Abstract:Families of coupled solitons of PT-symmetric physical models with gain and loss in fractional dimension and in settings with and without cross-interactions modulation (CIM) are reported. Profiles, powers, stability areas, and propagation dynamics of the obtained PT-symmetric coupled solitons are investigated. By comparing the results of the models with and without CIM, we find that the stability area of the model with CIM is much broader than the one without CIM. Remarkably, oscillating PT-symmetric coupled solitons can also exist in the model of CIM with the same coefficients of the self- and cross-interactions modulations. In addition, the period of these oscillating coupled solitons can be controlled by the linear coupling coefficient.<br/> © 2021, The Author(s), under exclusive licence to Springer Nature B.V. part of Springer Nature.

Number of references:85

Main heading:Solitons

Controlled terms:Modulation - Calculations - Nonlinear equations

Uncontrolled terms:Cross interactions - Linear coupling - Physical model - Propagation dynamics - Symmetric couplers

Classification code:921 Mathematics

DOI:10.1007/s11071-020-06180-7

Funding details: Number: 61827815,62075138, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: JCYJ20190808121817100,JCYJ20190808164007485, Acronym: -, Sponsor: Science and Technology Planning Project of Shenzhen Municipality;

Funding text:This work was supported by National Major Instruments and Equipments Development Project of National Natural Science Foundation of China (No. 61827815), by National Natural Science Foundation of China (No. 62075138), and by Science and Technology Project of Shenzhen (Nos. JCYJ20190808121817100 and JCYJ20190808164007485).

Database:Compendex

Open Access type(s): All Open Access, Green

Accession number:20212410488576

Title:Apparatus for generation of nanojoule-class water-window high-order harmonics (Open Access)

Authors:Nishimura, Kotaro (1, 2); Fu, Yuxi (1, 3); Suda, Akira (2); Midorikawa, Katsumi (1); Takahashi, Eiji J. (1)

Author affiliation:(1) Extreme Photonics Research Group, RIKEN Center for Advanced Photonics, RIKEN, 2-1 Hirosawa, Wako, Saitama; 351-0198, Japan; (2) Department of Physics, Tokyo University of Science, 2641 Yamazaki, Noda; Chiba; 278-8510, Japan; (3) Xiâ€™an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xiâ€™an, Shaanxi; 710119, China

Corresponding author:Takahashi, Eiji J.(ejtak@riken.jp)

Source title:Review of Scientific Instruments

Abbreviated source title:Rev. Sci. Instrum.

Volume:92

Issue:6

Issue date:June 1, 2021

Publication year:2021

Article number:063001

Language:English

ISSN:00346748

E-ISSN:10897623

CODEN:RSINAK

Document type:Journal article (JA)

Publisher:American Institute of Physics Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">In our recent study [Fu et al., Commun. Phys. 3(1), 92 (2020)], we have developed an approach for energy-scaling of high-order harmonic generation in the water-window region under a neutral-medium condition. More specifically, we obtained a nanojoule-class water-window soft x-ray harmonic beam under a phase-matching condition. It has been achieved by combining a newly developed terawatt-class mid-infrared femtosecond laser and a loose-focusing geometry for high-order harmonic generation. The generated beam is more than 100 times intense compared to previously reported results. The experimental setup included two key parts: a terawatt mid-infrared femtosecond driving laser [Fu et al., Sci. Rep. 8(1), 7692 (2018)] and a specially designed gas cell. Despite the dramatic drop in the optimal gas pressure for phase-matching due to loose-focusing geometry, it still reached the 1 bar level for helium. Thus, we have designed a double-structured pulsed-gas cell with a differential pumping system, which enabled providing sufficiently high gas pressure. Moreover, it allowed reducing gas consumption significantly. A robust energy-scalable apparatus for high-order harmonic generation developed in this study will enable the generation of over ten-nanojoule water-window attosecond pulses in the near future.<br/></div> © 2021 Author(s).

Number of references:61

Main heading:Phase matching

Controlled terms:Gases - Infrared devices - Optical pumping - Harmonic analysis - Harmonic generation

Uncontrolled terms:Attosecond pulse - Differential pumping - Energy scaling - Focusing geometry - High gas pressures - High order harmonic generation - High order harmonics - Phase matching conditions

Classification code:713 Electronic Circuits - 921.6 Numerical Methods

DOI:10.1063/5.0045342

Funding details: Number: S19-020-III, Acronym: -, Sponsor: -;Number: 19H0562, Acronym: KAKEN, Sponsor: Japan Society for the Promotion of Science;Number: 17H01067,21H01850,JP-MXS0118068681, Acronym: MEXT, Sponsor: Ministry of Education, Culture, Sports, Science and Technology;Number: 61690222, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: J20-021-III, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: -, Acronym: -, Sponsor: RIKEN;Number: 2019JCW-03, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;

Funding text:This work was supported, in part, by the Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT) through Grants-in-Aid under Grant Nos. 17H01067 and 21H01850, in part, by the MEXT Quantum Leap Flagship Program (Q-LEAP) (Grant No. JP-MXS0118068681), in part, by the FY 2019 President discretionary funds of RIKEN, in part, by the Matsuo Foundation 2018, and, in part, by the RIKEN Junior Research Associate Program. K.M. gratefully acknowledges the financial support from Grants-in-Aid for Scientific Research (Grant No. 19H0562). Y.F. gratefully acknowledges the financial support from the Major Science and Technology Infrastructure Pre-research Program of CAS (Grant No. J20-021-III), the Key Deployment Research Program of XIOPM (Grant No. S19-020-III), the Natural Science Basic Research Program of Shaanxi (Grant No. 2019JCW-03), and the National Natural Science Foundation of China (Grant No. 61690222).

Database:Compendex

Open Access type(s): All Open Access, Green

Accession number:20221712036072

Title:Generic Demosaicking Method for Multispectral Filter Arrays Based on Adaptive Frequency Domain Filtering

Authors:Wang, Zecheng (1, 2); Zhang, Geng (1); Hu, Bingliang (1)

Author affiliation:(1) Key Laboratory Of Spectral Imaging Technology, Xi'an Institute Of Optics And Precision Mechanics, Chinese Academy of Sciences, China; (2) School Of Optoelectronics, University Of Chinese Academy Of Sciences, China

Corresponding author:Wang, Zecheng(wzc2000@foxmail.com)

Source title:ACM International Conference Proceeding Series

Abbreviated source title:ACM Int. Conf. Proc. Ser.

Part number:1 of 1

Issue title:2021 4th International Conference on Sensors, Signal and Image Processing, SSIP 2021

Issue date:October 15, 2021

Publication year:2021

Pages:66-71

Language:English

ISBN-13:9781450385725

Document type:Conference article (CA)

Conference name:4th International Conference on Sensors, Signal and Image Processing, SSIP 2021

Conference date:October 15, 2021 - October 17, 2021

Conference location:Virtual, Online, China

Conference code:178686

Publisher:Association for Computing Machinery

Abstract:<div data-language="eng" data-ev-field="abstract">Multispectral filter arrays (MSFAs) are widely applied to achieve snapshot multispectral imaging on a single image sensor, which causes incomplete data of each channel in the original captured image, and thus a process of estimating missing data named "demosaicking"is needed for high spatial resolution imaging. In a multispectral imaging system equipped with MSFA, as the number of spectral channels increases, the lack of data in the original captured image becomes severer, which brings great challenges to the demosaicking process, and thus classical demosaicking methods for MSFAs often fail to satisfy both reconstructed image quality and computational efficiency. In this paper, we propose a generic demosaicking method for MSFAs based on adaptive frequency domain filtering (AFDF) which achieves high quality of reconstructed images with little computational cost. Experimental results demonstrate that our proposed demosaicking method outperforms the state-of-the-art methods in terms of both quality of reconstructed images and processing time.<br/></div> © 2021 ACM.

Number of references:30

Main heading:Computational efficiency

Controlled terms:Adaptive filtering - Adaptive filters - Frequency domain analysis - Image reconstruction

Uncontrolled terms:Adaptive frequency - Adaptive frequency domain filtering - Demosaicking - Domain filtering - Frequency domains - Multi-spectral filter arrays - Multispectral filter array - Multispectral imaging - Quality of reconstructed images - Single images

Classification code:921.3 Mathematical Transformations

DOI:10.1145/3502814.3502825

Database:Compendex

Accession number:20212310459709

Title:Tilt Correction Toward Building Detection of Remote Sensing Images (Open Access)

Authors:Liu, Kang (1, 5); Jiang, Zhiyu (2); Xu, Mingliang (3); Perc, Matjaz (4); Li, Xuelong (2)

Author affiliation:(1) Shaanxi Key Laboratory of Ocean Optics, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China; (2) Key Laboratory of Intelligent Interaction and Applications, The School of Artificial Intelligence, Optics and Electronics, Northwestern Polytechnical University, Xi'an, China; (3) School of Information Engineering, Zhengzhou University, Zhengzhou, China; (4) Faculty of Natural Sciences and Mathematics, University of Maribor, Maribor, Slovenia; (5) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Li, Xuelong(li@nwpu.edu.cn)

Source title:IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing

Abbreviated source title:IEEE J. Sel. Top. Appl. Earth Obs. Remote Sens.

Volume:14

Issue date:2021

Publication year:2021

Pages:5854-5866

Article number:9440788

Language:English

ISSN:19391404

E-ISSN:21511535

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">Building detection is a crucial task in the field of remote sensing, which can facilitate urban construction planning, disaster survey, and emergency landing. However, for large-size remote sensing images, the great majority of existing works have ignored the image tilt problem. This problem can result in partitioning buildings into separately oblique parts when the large-size images are partitioned. This is not beneficial to preserve semantic completeness of the building objects. Motivated by the above fact, we first propose a framework for detecting objects in a large-size image, particularly for building detection. The framework mainly consists of two phases. In the first phase, we particularly propose a tilt correction (TC) algorithm, which contains three steps: texture mapping, tilt angle assessment, and image rotation. In the second phase, building detection is performed with object detectors, especially deep-neural-network-based methods. Last but not least, the detection results will be inversely mapped to the original large-size image. Furthermore, a challenging dataset named Aerial Image Building Detection is contributed for the public research. To evaluate the TC method, we also define an evaluation metric to compute the cost of building partition. The experimental results demonstrate the effects of the proposed method for building detection.<br/></div> © 2008-2012 IEEE.

Number of references:59

Main heading:Remote sensing

Controlled terms:Deep neural networks - Antennas - Buildings - Textures - Historic preservation - Object detection - Semantics

Uncontrolled terms:Building detection - Detecting objects - Emergency landing - Evaluation metrics - Object detectors - Remote sensing images - Semantic completeness - Urban construction

Classification code:402 Buildings and Towers - 461.4 Ergonomics and Human Factors Engineering - 723.2 Data Processing and Image Processing

DOI:10.1109/JSTARS.2021.3083481

Funding details: Number: 61424010207, Acronym: -, Sponsor: -;Number: 61871470,62001397, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: QYZDY-SSW-JSC044, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2020JQ-212, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;

Funding text:Manuscript received March 16, 2021; revised May 14, 2021; accepted May 21, 2021. Date of publication May 25, 2021; date of current version June 16, 2021. This work was supported in part by the Key Research Program of Frontier Sciences, Chinese Academy of Sciences under Grant QYZDY-SSW-JSC044, in part by the National Natural Science Foundation of China under Grant 61871470 and Grant 62001397, in part by the Natural Science Basic Research Program of Shaanxi under Grant 2020JQ-212, and in part by the Open-Ended Foundation of National Radar Signal Processing Laboratory under Grant 61424010207. (Corresponding author: Xuelong Li.) Kang Liu is with the Shaanxi Key Laboratory of Ocean Optics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China, and also with the University of Chinese Academy of Sciences, Beijing 100049, China (e-mail: liukang@opt.ac.cn).

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20210253797

Title:Learning Oculomotor behaviors from scanpath

Authors:Li, Beibin (1); Nuechterlein, Nicholas (1); Barney, Erin (2); Foster, Claire (3); Kim, Minah (4); Mahony, Monique (2); Atyabi, Adham (5); Feng, Li (6); Wang, Quan (7); Ventola, Pamela (8); Shapiro, Linda (1); Shic, Frederick (9)

Author affiliation:(1) University of Washington, Seattle; WA, United States; (2) Seattle Children's Research Institute, Seattle; WA, United States; (3) Binghamton University, Binghamton; NY, United States; (4) University of Virginia, Charlottesville; VA, United States; (5) University of Colorado, Colorado Springs; CO, United States; (6) Xiangya Hospital, Central South University, Hunan, Changsha, China; (7) Xi'An Institute of Optics and Precision, Mechanics, CAS, Xi'an, Shaanxi, China; (8) Yale University, New Haven; CT, United States; (9) University of Washington, Seattle Children's Research Institute, Seattle; WA, United States

Source title:arXiv

Abbreviated source title:arXiv

Issue date:August 11, 2021

Publication year:2021

Language:English

E-ISSN:23318422

Document type:Preprint (PP)

Publisher:arXiv

Abstract:<div data-language="eng" data-ev-field="abstract">Identifying oculomotor behaviors relevant for eye-tracking applications is a critical but often challenging task. Aiming to automatically learn and extract knowledge from existing eye-tracking data, we develop a novel method that creates rich representations of oculomotor scanpaths to facilitate the learning of downstream tasks. The proposed stimulus-agnostic Oculomotor Behavior Framework (OBF) model learns human oculomotor behaviors from unsupervised and semi-supervised tasks, including reconstruction, predictive coding, fixation identification, and contrastive learning tasks. The resultant pre-trained OBF model can be used in a variety of applications. Our pre-trained model outperforms baseline approaches and traditional scanpath methods in autism spectrum disorder and viewed-stimulus classification tasks. Ablation experiments further show our proposed method could achieve even better results with larger model sizes and more diverse eye-tracking training datasets, supporting the model's potential for future eye-tracking applications. Open source code: http://github.com/BeibinLi/OBF.<br/></div> Copyright © 2021, The Authors. All rights reserved.

Number of references:44

Main heading:Eye tracking

Controlled terms:Behavioral research - Deep learning - Open source software - Open systems - Unsupervised learning

Uncontrolled terms:Deep learning - Eye-tracking - Framework models - Gaze detection - Learn+ - Neural-networks - Pretrain - Scan path - Tracking application - Tracking data

Classification code:461.4 Ergonomics and Human Factors Engineering - 723 Computer Software, Data Handling and Applications - 971 Social Sciences

Database:Compendex

Preprint source website:https://arxiv.org

Preprint ID type:ARXIV

Accession number:20213910957017

Title:Direct femtosecond laser inscription of an IR fluorotellurite fiber Bragg grating

Authors:Liu, Lutao (1, 2); Chen, Fengyi (3); Xiao, Xusheng (1, 2); Li, Xingyong (3); Wang, Ruohui (3); Liu, Chengzhen (1, 2); Guo, Haitao (1, 2)

Author affiliation:(1) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences (CAS), Shaanxi, Xi’an; 710119, China; (2) Centre for Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences (UCAS), Beijing; 100049, China; (3) School of Physics, Northwest University, Shaanxi, Xi’an; 710069, China

Corresponding author:Guo, Haitao(guoht_001@opt.ac.cn)

Source title:Optics Letters

Abbreviated source title:Opt. Lett.

Volume:46

Issue:19

Issue date:October 1, 2021

Publication year:2021

Pages:4832-4835

Language:English

ISSN:01469592

E-ISSN:15394794

CODEN:OPLEDP

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">This study proposes a novel, to the best of our knowledge, development of fluorotellurite glass fiber Bragg gratings (FBGs). Shell-like morphology was achieved using a single femtosecond laser pulse illuminated through the fiber’s polymer coating. Different FBG fabrication methods and parameters were systematically studied to optimize performance. The fluorotellurite FBG exhibited a high sensitivity to writing laser power and reflectivity saturation effect in repetitive writing. A low-insertion-loss fluorotellurite FBG with a reflectivity of over 99% and bandwidth of less than 1 nm was successfully inscribed. The flexible inscription methods can write an FBG at any wavelength in the fluorotellurite glass transparent window, and are applicable to infrared fiber lasers or sensors.<br/></div> © 2021 Optical Society of America

Number of references:23

Main heading:Fiber Bragg gratings

Controlled terms:Plastic coatings - Laser pulses - Reflection - Fiber lasers - Glass - Femtosecond lasers

Uncontrolled terms:Fabrication method - Fabrication parameters - Femtosecond laser inscriptions - Fluoro-tellurite glass - Glass-fibers - Gratings fabrication - High sensitivity - Knowledge development - Performance - Polymer Coating

Classification code:744.1 Lasers, General - 744.4 Solid State Lasers - 812.3 Glass - 813.2 Coating Materials - 817.2 Polymer Applications

Numerical data indexing:Percentage 9.90E+01%, Size 1.00E-09m

DOI:10.1364/OL.439290

Funding details: Number: 61935006,62005312,62090065, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: JCTD-2018-19, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: IOSKL2020KF11, Acronym: SKLIOE, Sponsor: State Key Laboratory on Integrated Optoelectronics;

Funding text:Funding. National Natural Science Foundation of China (61935006, 62005312, 62090065); CAS Interdisciplinary Innovation Team project (JCTD-2018-19); Open Fund of the State Key Laboratory of Integrated Optoelectronics (IOSKL2020KF11).

Database:Compendex

Accession number:20214911287705

Title:Valuation Analysis of Chinese and American Listed Companies Based on Multiple Linear Regression and Grey Forecasting Model

Authors:Li, Jinke (1); Zhang, Qiang (2); Zhang, ZhiJun (3); Wang, Fan (2); Li, Xijie (3)

Author affiliation:(1) School of Mathematics, Columbia University, United States; (2) School of Mathematics, Wuhan University of Technology, China; (3) School of Mathematics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, China

Corresponding author:Zhang, ZhiJun(hhhhaas@yeah.net)

Source title:ACM International Conference Proceeding Series

Abbreviated source title:ACM Int. Conf. Proc. Ser.

Part number:1 of 1

Issue title:ICCCV 2021 - Proceedings of the 4th International Conference on Control and Computer Vision

Issue date:August 13, 2021

Publication year:2021

Pages:202-207

Language:English

ISBN-13:9781450390477

Document type:Conference article (CA)

Conference name:4th International Conference on Control and Computer Vision, ICCCV 2021

Conference date:August 13, 2021 - August 15, 2021

Conference location:Virtual, Online, China

Conference code:174672

Publisher:Association for Computing Machinery

Abstract:<div data-language="eng" data-ev-field="abstract">With the development of China's economic globalization, the stock market has gradually demonstrated its important position in the development of China's market economy. First, this paper selects the average market-to-sales ratio as the valuation level, uses an evaluation model to calculate the valuation level of the Chinese A-share market and the US NASDAQ market in 2018, and calculates the valuation premium or discount level of these two markets. Secondly, we establish a multiple linear regression model to quantitatively analyze the relationship between the valuation indicators and fundamental indicators and liquidity indicators of China A-shares and the US NASDAQ market. Then, a grey forecast model is established to predict and analyze the fundamental indicators and liquidity indicators of the Chinese A-share market and the US NASDAQ market in 2019. According to the forecast results, the valuation indicators of these two markets in 2019 are calculated. The results found that the valuation level of my country's first batch of sci-tech innovation board companies fluctuates around 5 times, which is smaller than that of the United States, indicating that China's stock market has greater potential.<br/></div> © 2021 ACM.

Number of references:17

Main heading:Forecasting

Controlled terms:Commerce - Financial markets - Linear regression

Uncontrolled terms:China markets - Economic globalization - Gray forecast model - Grey forecasting model - Market sales - Market-sale ratio - Multiple linear regression models - Multiple linear regressions - Regression forecasting model - Share market

Classification code:922.2 Mathematical Statistics

DOI:10.1145/3484274.3484308

Database:Compendex

Accession number:20212710582174

Title:Bonding strength enhancement by Ag–Zn–Cu intermetallic compounds and microscale tapers array fabricated by femtosecond laser

Authors:Wang, Cong (1); Li, Chuanqiang (1); Luo, Zhi (1); Li, Ming (2); Lin, Nai (3); Ding, Kaiwen (1); Man, Shu (1); Duan, Ji’an (1)

Author affiliation:(1) State Key Laboratory of High Performance and Complex Manufacturing, College of Mechanical and Electrical Engineering, Central South University, Changsha; 410083, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics of CAS, Xi’an; Shaanxi; 710119, China; (3) The 10th Research Institute of CETC, Chengdu; Sichuan; 610036, China

Corresponding author:Luo, Zhi(luozhi@csu.edu.cn)

Source title:Journal of Materials Science: Materials in Electronics

Abbreviated source title:J Mater Sci Mater Electron

Volume:32

Issue:14

Issue date:July 2021

Publication year:2021

Pages:19543-19551

Language:English

ISSN:09574522

E-ISSN:1573482X

Document type:Journal article (JA)

Publisher:Springer

Abstract:<div data-language="eng" data-ev-field="abstract">In this study, a highly reliable and effective method for copper bonding using femtosecond laser-fabricated microscale tapers array and Ag–Zn–Cu intermetallic compounds as assistants is proposed. By the growth of intermetallic compounds among the microscale tapers array, the copper interfaces were firmly sintered. The cross section after shearing test was marked for analysis of sintering quality. Also, the shearing strength of interconnected copper interfaces under different bonding temperature, and holding times was investigated. The results show that the shearing strength can reach up to 120.1 MPa under 300 °C bonding temperature and 30 min holding time. According to the interconnected cross section and shearing strength test, the mechanism of increased shearing strength is explained. The experimental results show that the shearing strength of interconnected interface is greatly enhanced by the increase of contact area caused by microscale tapers array and the mechanical locking caused by the growth of intermetallic compounds. More possibilities could be provided by this technology in the field of electronic packaging interconnection and three-dimensional integrated circuits.<br/></div> © 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.

Number of references:17

Main heading:Intermetallics

Controlled terms:Electronics packaging - Sintering - Femtosecond lasers - Shearing - Copper compounds - Fabrication - Three dimensional integrated circuits - Locks (fasteners)

Uncontrolled terms:Bonding strength - Bonding temperatures - Copper interface - Electronic Packaging - Growth of intermetallics - Mechanical locking - Shearing strength - Shearing tests

Classification code:531.1 Metallurgy - 604.1 Metal Cutting - 714.2 Semiconductor Devices and Integrated Circuits - 744.1 Lasers, General

DOI:10.1007/s10854-021-06473-6

Funding details: Number: 51975595, Acronym: NSFC, NNSF, NNSFC, Sponsor: National Natural Science Foundation of China;Number: 2020JJ5738, Acronym: -, Sponsor: Natural Science Foundation of Hunan Province;Number: ZZYJKT2020-10,ZZYJKT2021-12, Acronym: -, Sponsor: State Key Laboratory of High Performance Complex Manufacturing;Number: 2017YFB1104300, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;Number: the fundamental research funds for the central universities of central south university, Acronym: -, Sponsor: Fundamental Research Funds for Central Universities of the Central South University;Number: S2019-YF-ZDCXL-ZDLGY-0253, Acronym: -, Sponsor: Shanxi Provincial Key Research and Development Project;

Funding text:This research is supported by the National Key R&D Program of China (Grant No. 2017YFB1104300), the National Natural Science Foundation of China (Grant No. 51975595), the Natural Science Foundation of Hunan Province (Grant No. 2020JJ5738), the Key Research and Development Program of Shaanxi Province(S2019-YF-ZDCXL-ZDLGY-0253), the Project of State Key Laboratory of High Performance Complex Manufacturing (Grant No. ZZYJKT2020-10 and ZZYJKT2021-12), and the Fundamental Research Funds for the Central Universities of Central South University.

Database:Compendex

Accession number:20212010361044

Title:Four-wave mixing in silicon-nanocrystal embedded high-index doped silica micro-ring resonator

Authors:Li, Yuhua (1, 2); Wang, Xiang (3); Davidson, Roy (3); Little, Brent E. (4); Chu, Sai Tak (2)

Author affiliation:(1) Key Laboratory of Optical Field Manipulation of Zhejiang Province, Department of Physics, Zhejiang Sci-Tech University, Hangzhou; 310018, China; (2) Department of Physics, City University of Hong Kong, Hong Kong; 999077, Hong Kong; (3) QXP Technology Inc., Xi'an; 710119, China; (4) State Key Laboratory of Transient Optics and Photonics, XIOPM, CAS, Xi'an; 710119, China

Corresponding author:Chu, Sai Tak(saitchu@cityu.edu.hk)

Source title:Journal of Semiconductors

Abbreviated source title:J. Semicond.

Volume:42

Issue:4

Issue date:April 2021

Publication year:2021

Article number:042302

Language:English

ISSN:16744926

Document type:Journal article (JA)

Publisher:IOP Publishing Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">A nonlinear integrated optical platform that allows the fabrication of waveguide circuits with different material composition, and at small dimensions, offers advantages in terms of field enhancement and increased interaction length, thereby facilitating the observation of nonlinear optics effects at a much lower power level. To enhance the nonlinearity of the conventional waveguide structure, in this work, we propose and demonstrate a microstructured waveguide where silicon rich layer is embedded in the core of the conventional waveguide in order to increase its nonlinearity. By embedding a 20 nm thin film of silicon nanocrystal (Si-nc), we achieve a twofold increase of the nonlinear parameter, γ. The linear relationship between the four-wave mixing conversion efficiency and pump power reveals the negligible nonlinear absorption and small dispersion in the micro-ring resonators. This simple approach of embedding an ultra-thin Si-nc layer into conventional high-index doped silica dramatically increases its nonlinear performance, and could potentially find applications in all-optical processing functions.<br/></div> © 2021 Chinese Institute of Electronics.

Number of references:30

Main heading:Four wave mixing

Controlled terms:Nanocrystals - Embeddings - Optical resonators - Silicon - Silica - Waveguides

Uncontrolled terms:All-optical processing - Linear relationships - Material compositions - Microstructured waveguides - Non-linear optics effects - Non-linear parameters - Nonlinear absorptions - Silicon nanocrystals

Classification code:549.3 Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals - 714.3 Waveguides - 723.4 Artificial Intelligence - 741.3 Optical Devices and Systems - 761 Nanotechnology - 933.1 Crystalline Solids

Numerical data indexing:Size 2.00e-08m

DOI:10.1088/1674-4926/42/4/042302

Database:Compendex

Accession number:20213610868178

Title:Difference curvature multidimensional network for hyperspectral image super-resolution (Open Access)

Authors:Zhang, Chi (1); Zhang, Mingjin (1); Li, Yunsong (1); Gao, Xinbo (1, 2); Shi, Qiu (3)

Author affiliation:(1) State Key Laboratory of Integrated Services Networks, School of Telecommunications Engineering, Xidian University, Xi’an; 710071, China; (2) Chongqing Key Laboratory of Image Cognition, Chongqing University of Posts and Telecommunications, Chongqing; 400065, China; (3) Key Laboratory of Spectral Imaging Technology CAS, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China

Corresponding author:Zhang, Mingjin(mjinzhang@xidian.edu.cn)

Source title:Remote Sensing

Abbreviated source title:Remote Sens.

Volume:13

Issue:17

Issue date:September 2021

Publication year:2021

Article number:3455

Language:English

E-ISSN:20724292

Document type:Journal article (JA)

Publisher:MDPI

Abstract:<div data-language="eng" data-ev-field="abstract">In recent years, convolutional-neural-network-based methods have been introduced to the field of hyperspectral image super-resolution following their great success in the field of RGB image super-resolution. However, hyperspectral images appear different from RGB images in that they have high dimensionality, implying a redundancy in the high-dimensional space. Existing approaches struggle in learning the spectral correlation and spatial priors, leading to inferior performance. In this paper, we present a difference curvature multidimensional network for hyperspectral image super-resolution that exploits the spectral correlation to help improve the spatial resolution. Specifically, we introduce a multidimensional enhanced convolution (MEC) unit into the network to learn the spectral correlation through a self-attention mechanism. Meanwhile, it reduces the redundancy in the spectral dimension via a bottleneck projection to condense useful spectral features and reduce computations. To remove the unrelated information in high-dimensional space and extract the delicate texture features of a hyperspectral image, we design an additional difference curvature branch (DCB), which works as an edge indicator to fully preserve the texture information and eliminate the unwanted noise. Experiments on three publicly available datasets demonstrate that the proposed method can recover sharper images with minimal spectral distortion compared to state-of-the-art methods. PSNR/SAM is 0.3–0.5 dB/0.2–0.4 better than the second best methods.<br/></div> © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Number of references:56

Main heading:Redundancy

Controlled terms:Convolution - Textures - Optical resolving power - Image enhancement - Spectroscopy - Deep neural networks

Uncontrolled terms:Attention mechanisms - High dimensional spaces - Image super resolutions - Multi-dimensional networks - Spectral correlation - Spectral dimensions - Spectral distortions - State-of-the-art methods

Classification code:461.4 Ergonomics and Human Factors Engineering - 716.1 Information Theory and Signal Processing - 741.1 Light/Optics

DOI:10.3390/rs13173455

Funding details: Number: 20200103, Acronym: -, Sponsor: -;Number: 61902293, Acronym: NNSFC, Sponsor: National Natural Science Foundation of China;Number: XJS200112, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;Number: 2021GY-034, Acronym: -, Sponsor: Shanxi Provincial Key Research and Development Project;

Funding text:Funding: This work was supported in part by the National Natural Science Foundation of China under Grant 61902293; in part by the Key Research and Development Program of Shaanxi under Grant 2021GY-034; in part by the Young Talent Fund of University Association for Science and Technology, Shaanxi, China, under Grant 20200103; in part by the Fundamental Research Funds for the Central Universities under Grant XJS200112.

Database:Compendex

Open Access type(s): All Open Access, Gold, Green

Accession number:20212710597259

Title:Loosening mechanism and stress-resistance mapping relationship of electrical connector under triaxial random vibration

Title of translation:三轴随机振动下电连接器的松动机理及应力-电阻映射关系研究

Authors:Liu, Shaojie (1); Qiu, Yuanying (1); Bai, Jin (1); Du, Jiangong (1); Li, Jing (1); Wang, Haidong (2); Wang, Zhaoxi (2); Zhang, Lei (3)

Author affiliation:(1) School of Mechano-Electronic Engineering, Xidian University, Xi'an; 710071, China; (2) Shanghai Spaceflight Precision Machinery Research Institute, Shanghai; 201600, China; (3) China Aviation Optical-Electrical Technology Co., Ltd., Luoyang; 471000, China

Corresponding author:Qiu, Yuanying

Source title:Zhendong yu Chongji/Journal of Vibration and Shock

Abbreviated source title:J Vib Shock

Volume:40

Issue:11

Issue date:June 15, 2021

Publication year:2021

Pages:190-195

Language:Chinese

ISSN:10003835

Document type:Journal article (JA)

Publisher:Chinese Vibration Engineering Society

Abstract:<div data-language="eng" data-ev-field="abstract">Under multi-axis complex vibration environment, an electrical connector structure may be loose to affect electrical contact performance of its electrical appliances and cause failure of equipment function. Here, in order to explore mechanical characteristics of electrical connector in loosening process under multi-axis random vibration environment, a model of electrical connector in missile electronic cabin was established. The change time history of contact pressure in pin's withdrawing process during it being loose relative to pinhole was simulated under random vibration environment, and the stress evolution mechanism in loosening process of electrical connector was revealed. Through comparing stress varying trend under triaxial random vibration and that under uniaxial random vibration, according to differences of three intervals, looseness characteristics of electrical connector under triaxial vibration were compared with those under uniaxial vibration, and a triaxial vibration stress screening method for connector looseness was provided. The mapping relationship between stress and resistance of electrical connector was derived by using R.Holm expression for relation between contact resistance and contact pressure, and the monitoring of contact stress between pin and pinhole was converted into monitoring of contact resistance to solve the technical problem of dynamic stress inside pinhole being difficult to measure.<br/></div> © 2021, Editorial Office of Journal of Vibration and Shock. All right reserved.

Number of references:18

Main heading:Contact resistance

Controlled terms:Stresses - Vibration analysis - Electric connectors - Electric contacts - Finite element method

Uncontrolled terms:Electrical appliances - Electrical connectors - Electrical contacts - Loosening mechanism - Mapping relationships - Mechanical characteristics - Triaxial vibrations - Vibration environment

Classification code:701.1 Electricity: Basic Concepts and Phenomena - 704.1 Electric Components - 921.6 Numerical Methods

DOI:10.13465/j.cnki.jvs.2021.11.027

Database:Compendex

Accession number:20212810608622

Title:Size effects in a hybrid plasmonic waveguide based power monitor with a bolometric method

Authors:Li, Yan (1); Chen, Anqi (1); Dai, Tingge (4); Chen, Weiwei (1); Liu, Hongjun (2); Wang, Pengjun (3)

Author affiliation:(1) Department of Electrical Engineering and Computer Science, Ningbo University, Ningbo, China; (2) State Key Laboratory of Transient Optics and Photonics, Chinese Academy of Sciences, Xi'an, China; (3) Department of Mathematics, Physics and Electronic Information Engineering, Wenzhou University, Wenzhou, China; (4) Department of Information Science and Engineering, Ningbo Institute of Technology, Zhejiang University, Ningbo, China

Corresponding authors:Chen, Anqi(chenanqi@nbu.edu.cn); Wang, Pengjun(wangpengjun@wzu.edu.cn)

Source title:Journal of Physics D: Applied Physics

Abbreviated source title:J Phys D

Volume:54

Issue:35

Issue date:September 2021

Publication year:2021

Article number:355107

Language:English

ISSN:00223727

E-ISSN:13616463

CODEN:JPAPBE

Document type:Journal article (JA)

Publisher:IOP Publishing Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">A silicon based hybrid plasmonic waveguide (HPW) configuration has been widely utilized to monitor the power flowing in the plasmonic circuit. Due to the approximately linear relationship between resistance and temperature change (the temperature coefficient of resistance, TCR), the voltage-signal variation directly leads to the change of resistance and the corresponding change of coupled-in power. However, the size effect is rarely explored and demonstrated, which plays a substantial role while the metal-strip thickness approaches to its electron mean free path. It exhibits different electric properties, such as reduced TCR and thermal conductivity, resulting in deviations of resistivity. On the contrary, due to the increase of boundary scattering and narrow-strip absorption, an improvement of the responsivity and excepted sensitivity is found. Therefore, considering a trade-off associated with size effects, 50 nm silver-strip and gold-strip were utilized as the conductor layer in the HPW configuration with different geometries, respectively. Meanwhile, a 50 nm 300 nm gold-strip HPW provides an improvement performance, up to 13.7 mV mW V-1, 0.05 μW sensitivity at bias 0.1 V. Its responsivity is about 1.4 times larger than that of silver, which contradicts to the macroscopic model.<br/></div> © 2021 IOP Publishing Ltd.

Number of references:20

Main heading:Strip metal

Controlled terms:Size determination - Temperature - Silicon photonics - Economic and social effects - Gold - Plasmonics - Thermal conductivity - Silver - Optical waveguides

Uncontrolled terms:Boundary scattering - Different geometry - Electron mean free path - Hybrid plasmonic waveguides - Linear relationships - Plasmonic circuits - Temperature changes - Temperature coefficient of resistance

Classification code:535.1 Metal Rolling - 547.1 Precious Metals - 641.1 Thermodynamics - 714.3 Waveguides - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 932.3 Plasma Physics - 971 Social Sciences

Numerical data indexing:Power 5.00e-08W, Size 3.00e-07m, Size 5.00e-08m, Voltage 1.00e-01V

DOI:10.1088/1361-6463/ac0927

Database:Compendex

Accession number:20210073461

Title:Bio-inspired representation learning for visual attention prediction

Authors:Yuan, Yuan (1); Ning, Hailong (2, 3); Lu, Xiaoqiang (2)

Author affiliation:(1) The Center for OPTical IMagery Analysis and Learning, School of the Computer Science, Northwestern Polytechnical University, Xi’an; Shaanxi; 710072, China; (2) The Key Laboratory of Spectral Imaging Technology CAS, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; Shaanxi; 710119, China; (3) The University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Lu, Xiaoqiang(luxq666666@gmail.com)

Source title:arXiv

Abbreviated source title:arXiv

Issue date:March 9, 2021

Publication year:2021

Language:English

E-ISSN:23318422

Document type:Preprint (PP)

Publisher:arXiv

Abstract:<div data-language="eng" data-ev-field="abstract">Visual Attention Prediction (VAP) is a significant and imperative issue in the field of computer vision. Most of existing VAP methods are based on deep learning. However, they do not fully take advantage of the low-level contrast features while generating the visual attention map. In this paper, a novel VAP method is proposed to generate visual attention map via bio-inspired representation learning. The bio-inspired representation learning combines both low-level contrast and high-level semantic features simultaneously, which are developed by the fact that human eye is sensitive to the patches with high contrast and objects with high semantics. The proposed method is composed of three main steps: 1) feature extraction, 2) bio-inspired representation learning and 3) visual attention map generation. Firstly, the high-level semantic feature is extracted from the refined VGG16, while the low-level contrast feature is extracted by the proposed contrast feature extraction block in a deep network. Secondly, during bio-inspired representation learning, both the extracted low-level contrast and high-level semantic features are combined by the designed densely connected block, which is proposed to concatenate various features scale by scale. Finally, the weighted-fusion layer is exploited to generate the ultimate visual attention map based on the obtained representations after bio-inspired representation learning. Extensive experiments are performed to demonstrate the effectiveness of the proposed method.<br/></div> © 2021, CC BY.

Number of references:60

Main heading:Forecasting

Controlled terms:Behavioral research - Biomimetics - Deep learning - Extraction - Feature extraction - Semantics

Uncontrolled terms:% reductions - Center bias - Center-bias prior - Contrast feature - Densely connected - High-level semantic features - Reduction-attention - Semantic features - Visual Attention - Visual attention prediction

Classification code:461.4 Ergonomics and Human Factors Engineering - 461.8 Biotechnology - 461.9 Biology - 802.3 Chemical Operations - 971 Social Sciences

Database:Compendex

Preprint source website:https://arxiv.org

Preprint ID type:ARXIV

Accession number:20214411088663

Title:Off-axis optical levitation and transverse spinning of metallic microparticles

Authors:Liang, Yansheng (1); Yan, Shaohui (2); Wang, Zhaojun (1); Yao, Baoli (2); Lei, Ming (1)

Author affiliation:(1) MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Shaanxi Province Key Laboratory of Quantum Information and Quantum Optoelectronic Devices, School of Physics, Xi’an Jiaotong University, Xi’an; 710049, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China

Corresponding author:Lei, Ming(ming.lei@mail.xjtu.edu.cn)

Source title:Photonics Research

Abbreviated source title:Photon. Res.

Volume:9

Issue:11

Issue date:November 1, 2021

Publication year:2021

Pages:2144-2151

Language:English

ISSN:23279125

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">Optical manipulation of metallic microparticles remains a significant challenge because of the strong scattering forces arising from the high extinction coefficient of the particles. This paper reports a new mechanism for stable confinement of metallic microparticles using a tightly focused linearly polarized Gaussian beam. Theoretical and experimental results demonstrate that metallic microparticles can be captured off the optical axis in such a beam. Meanwhile, the three-dimensionally confined particles are observed spinning transversely as a response to the asymmetric force field. The off-axis levitation and transverse spinning of metallic microparticles may provide a new way for effective manipulation of metallic microparticles.<br/></div> © 2021 Chinese Laser Press.

Number of references:45

Main heading:Gaussian beams

Controlled terms:Metals

Uncontrolled terms:High extinction coefficients - Linearly polarized - Metallics - Micro particles - New mechanisms - Off-axis - Optical levitation - Optical manipulation - Scattering forces - Strong scatterings

Classification code:711 Electromagnetic Waves

DOI:10.1364/PRJ.431413

Funding details: Number: 11974417,61905189,62005208, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2019M663656,2020M673365, Acronym: -, Sponsor: China Postdoctoral Science Foundation;

Funding text:Funding. Innovation Capability Support Program of Shaanxi (2021TD-57); National Natural Science Foundation of China (NSFC) (61905189, 62005208, 11974417); China Postdoctoral Science Foundation (2019M663656, 2020M673365).

Database:Compendex

Accession number:20212210433915

Title:Dynamics of dark breathers and Raman-Kerr frequency combs influenced by high-order dispersion (Open Access)

Authors:Liu, Mulong (1); Huang, Huimin (2); Lu, Zhizhou (3); Wang, Yuanyuan (1); Cai, Yanan (1); Zhao, Wei (4)

Author affiliation:(1) School of Science, Northwest A&F University, Yangling; 712100, China; (2) College of Information Engineering, Northwest A&F University, Yangling; 712100, China; (3) Chongqing United Microelectronics Center (CUMEC), Xiyuan South Street, Chongqing; 401332, China; (4) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences (CAS), Xi’an; 710119, China

Corresponding author:Huang, Huimin(huanghm@nwafu.edu.cn)

Source title:Optics Express

Abbreviated source title:Opt. Express

Volume:29

Issue:12

Issue date:June 7, 2021

Publication year:2021

Pages:18095-18107

Language:English

E-ISSN:10944087

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">We investigate the dark breathers and Raman-Kerr microcombs generation influenced by stimulated Raman scattering (SRS) and high-order dispersion (HOD) effects in silicon microresonators with an integrated spatiotemporal formalism. The strong and narrow Raman gain constitute a threshold behavior with respect to free spectral range above which stable dark pulses can exist. The breathing dark pulses induced by HOD mainly depend on the amplitude and sign of third-order dispersion coefficient and their properties are also affected by the Raman assisted four wave mixing process. Such dissipative structures formed through perturbed switching waves, mainly exist in a larger red detuning region than that of stable dark pulses. Their breathing characteristics related to driving conditions have been analyzed in detail. Furthermore, the octave spanning mid-infrared (MIR) frequency combs via Cherenkov radiation are demonstrated, which circumvent chaotic and multi-soliton states compared with their anomalous dispersion-based counterpart. Our findings provide a viable way to investigate the physics inside dark pulses and broadband MIR microcombs generation.<br/></div> © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.

Number of references:60

Main heading:Stimulated Raman scattering

Controlled terms:Four wave mixing - Dispersion (waves) - Microresonators

Uncontrolled terms:Cherenkov radiations - Dissipative structure - High-order dispersion - Raman-assisted four-wave mixing - Silicon microresonators - Spatio-temporal formalisms - Stimulated raman scatterings (SRS) - Third order dispersion

Classification code:711 Electromagnetic Waves - 741.1 Light/Optics - 744.7 Laser Components

DOI:10.1364/OE.427718

Funding details: Number: Z1090121016,Z1090220308, Acronym: -, Sponsor: -;Number: 52002331,61675231, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: XDB24030600, Acronym: CAS, Sponsor: Chinese Academy of Sciences;

Funding text:Funding. Northwest A and F University (Z1090121016, Z1090220308); Strategic Priority Research Program of the Chinese Academy of Sciences (XDB24030600); National Natural Science Foundation of China (52002331, 61675231).

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20215211394370

Title:Fringe projection profilometry with phase-coded optics

Authors:Yan, Qi (1, 2); Ma, Suodong (1, 2, 3); Chen, Xu (1, 2); Xu, Feng (1, 2); Huang, Qitai (1, 2)

Author affiliation:(1) Sch. of Optoelectron. Sci. and Eng. and Collab. Innov. Center of Suzhou Nano Science and Technology, Soochow University, Suzhou; 215006, China; (2) Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province, Key Lab of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou; 215006, China; (3) CAS Key Laboratory of Space Precision Measurement Technology, Xi an; 710119, China

Corresponding author:Ma, Suodong(masuodong@suda.edu.cn)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11899

Part number:1 of 1

Issue title:Optical Metrology and Inspection for Industrial Applications VIII

Issue date:2021

Publication year:2021

Article number:1189914

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510646476

Document type:Conference article (CA)

Conference name:Optical Metrology and Inspection for Industrial Applications VIII 2021

Conference date:October 10, 2021 - October 12, 2021

Conference location:Nantong, China

Conference code:175375

Sponsor:Chinese Optical Society (COS); The Society of Photo-Optical Instrumentation Engineers (SPIE)

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">Fringe projection profilometry (FPP) is a commonly used tool in the three-dimensional (3D) measurement of diffuse objects in reverse engineering, products online detection, medical diagnosis, etc. However, due to the limited depth-of-field (DOF) of projection-imaging lenses, the contrast of captured sinusoidal fringes will decrease with the increase of defocus, which affects the high-precision acquisition of axial 3D topography. Although the lenses can be designed based on Scheimpflug principle or double-Telecentric optical path to extend the DOF, some problems such as off-Axis aberration, fixed magnification and limited field-of-view are still existing. To overcome the aforementioned drawbacks, FPP with phase-coded optics is proposed in this paper, where the captured sinusoidal fringe patterns are modulated effectively and the projection-imaging DOF of the system is greatly extended. Experimental results demonstrate the effectiveness of the proposed technique.<br/></div> © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

Number of references:15

Main heading:Lenses

Controlled terms:Profilometry - Aberrations - Medical imaging - Reverse engineering - Diagnosis - Topography

Uncontrolled terms:Depth of field - Engineering products - Fringe projection profilometry - Measurements of - Phase-coded optic - Projection imaging - Three-dimensional (3D) measurements - Three-dimensional topography - Three-dimensional topography measurement - Topography measurement

Classification code:461.1 Biomedical Engineering - 461.6 Medicine and Pharmacology - 741.3 Optical Devices and Systems - 746 Imaging Techniques - 951 Materials Science

DOI:10.1117/12.2601795

Funding details: Number: SPMT2021001, Acronym: -, Sponsor: -;Number: 61307017, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: BK20130327, Acronym: -, Sponsor: Natural Science Foundation of Jiangsu Province;Number: -, Acronym: -, Sponsor: Soochow University;Number: 18KJB140015, Acronym: -, Sponsor: Natural Science Research of Jiangsu Higher Education Institutions of China;Number: -, Acronym: PAPD, Sponsor: Priority Academic Program Development of Jiangsu Higher Education Institutions;

Database:Compendex

Accession number:20215211394376

Title:Resolution-enhanced phase retrieval for fringe reflection technology with structured light illumination

Authors:Shen, Xianmeng (1, 2); Ren, Maoyun (1, 2); Ma, Suodong (1, 2, 3); Xu, Shengzhi (1, 2); Liu, Mingrui (1, 2); Zheng, Lichen (1, 2)

Author affiliation:(1) Sch. of Optoelectron. Sci. and Eng. and Collab. Innov. Center of Suzhou Nano Science and Technology, Soochow University, Suzhou; 215006, China; (2) Key Lab of Adv. Optical Mfg. Technol. of Jiangsu Prov. and Key Lab of Mod. Optical Technol. of Educ. Min. of China, Soochow University, Suzhou; 215006, China; (3) CAS Key Laboratory of Space Precision Measurement Technology, Xi an; 710119, China

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11899

Part number:1 of 1

Issue title:Optical Metrology and Inspection for Industrial Applications VIII

Issue date:2021

Publication year:2021

Article number:118991D

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510646476

Document type:Conference article (CA)

Conference name:Optical Metrology and Inspection for Industrial Applications VIII 2021

Conference date:October 10, 2021 - October 12, 2021

Conference location:Nantong, China

Conference code:175375

Sponsor:Chinese Optical Society (COS); The Society of Photo-Optical Instrumentation Engineers (SPIE)

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">Owing to its advantages of simple system structure, large dynamic range and high measurement accuracy, fringe reflection technique (FRT) is becoming a powerful tool for specular free-form surface testing in the fields of reverse engineering, defect inspection, optical manufacturing, etc. However, due to the optical transfer function (OTF) of the FRT optical system, high-frequency information on the surface of an element under test is easily lost, which affects the high-precision acquisition of three-dimensional (3D) topography especially in microscopic measurement. Although the above problem can be suppressed to some extent by using or designing high-performance optical systems, the significant increase in the complexity and cost of the measurement system is sometimes unacceptable. To overcome the afore mentioned issue, a resolution-enhanced phase retrieval algorithm based on structured illumination microscopy (SIM) for FRT with an ordinary optical system is proposed in this paper. The combination of FRT and SIM is realized by projecting conventional phase-shifting fringe patterns in multiple directions. In principle, resolution-enhanced phase retrieval with super-diffraction limitation (up to twice the pass band of OTF) can be realized through spectrum extraction, stitching and shifting. A low cost, compact, coaxial FRT setup based on open-source hardware is designed and built for experimental verification. Simulations and experimental results demonstrate the effectiveness of the proposed technique.<br/></div> © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

Number of references:10

Main heading:Surface measurement

Controlled terms:Open systems - Precision engineering - Surface topography - Topography - Optical systems - Optical transfer function - Reverse engineering - Cost engineering

Uncontrolled terms:Free-form surface - Fringe reflection technology - Fringe reflections - Light illumination - Phase retrieval - Resolutionenhanced phase retrieval - Specular free-form surface testing - Structured illumination - Structured Light - Structured light illumination

Classification code:741.1 Light/Optics - 741.3 Optical Devices and Systems - 911 Cost and Value Engineering; Industrial Economics - 931.2 Physical Properties of Gases, Liquids and Solids - 943.2 Mechanical Variables Measurements - 951 Materials Science

DOI:10.1117/12.2603764

Funding text:The National Natural Science Foundation of China (No. 61307017), The Natural Science Foundation of Jiangsu Province (No. BK20130327), The Natural Science Foundation of the Jiangsu Higher Education Institutions of China (No. 18KJB140015), the Independent Research Project of Key Laboratory of Advanced Optical Manufacturing Technologies of Jiangsu Province (Soochow University, 2021), the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) and The project was supported by the Open Research Fund of CAS Key Laboratory of Space Precision Measurement Technology (No. SPMT2021001). REFERENCES [1] L. Song, H. Yun, Y. Wu, et al. Surface profile measurement of specular cell phone cases on variable lateral scales by fringe reflection technique[J]. Journal of Optoelectronics Laser, 2012, 23(11):2154-2162. [2] T. Chen, L. Chen, H. Li, et al. Structured illumination super-resolution microscopy technology: review and prospect[J]. Chinese Optics, 2018, 11(03):307-328. [3] G. Häusler, C. Richter, K. H. Leitz, M. C. Knauer. Microdeflectometry-a novel tool to acquire three-dimensional microtopography with nanometer height resolution[J]. Optics Letters, 2008, 33(4): 396-398. [4] S. Lu, H. Hua. Structured illumination assisted microdeflectometry with optical depth scanning capability[J]. Optics Letters, 2016, 41(17):4114-4117.

Database:Compendex

Accession number:20210709910822

Title:Data augmentation and spectral structure features for limited samples hyperspectral classification (Open Access)

Authors:Wang, Wenning (1, 2, 3, 4); Liu, Xuebin (1, 3); Mou, Xuanqin (2)

Author affiliation:(1) Key Laboratory of Spectral Imaging Technology of CAS, Xiʹan Institute of Optics and Precision Mechanics, CAS, Xi’an; 710119, China; (2) Faculty of Electronic and Information Engineering, Xiʹan Jiaotong University, Xi’an; 710049, China; (3) University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Beijing; 100049, China; (4) School of Information Science and Engineering, Shandong Agricultural University, Taiʹan, Shandong, China

Corresponding authors:Wang, Wenning(wwn812@stu.xjtu.edu.cn); Wang, Wenning(wwn812@stu.xjtu.edu.cn); Wang, Wenning(wwn812@stu.xjtu.edu.cn); Wang, Wenning(wwn812@stu.xjtu.edu.cn)

Source title:Remote Sensing

Abbreviated source title:Remote Sens.

Volume:13

Issue:4

Issue date:February 2, 2021

Publication year:2021

Pages:1-23

Article number:547

Language:English

E-ISSN:20724292

Document type:Journal article (JA)

Publisher:MDPI AG

Abstract:For both traditional classification and current popular deep learning methods, the limited sample classification problem is very challenging, and the lack of samples is an important factor affecting the classification performance. Our work includes two aspects. First, the unsupervised data augmentation for all hyperspectral samples not only improves the classification accuracy greatly with the newly added training samples, but also further improves the classification accuracy of the classifier by optimizing the augmented test samples. Second, an effective spectral structure extraction method is designed, and the effective spectral structure features have a better classification accuracy than the true spectral features.<br/> © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Number of references:44

Main heading:Classification (of information)

Controlled terms:Extraction - Deep learning - Learning systems

Uncontrolled terms:Classification accuracy - Classification performance - Data augmentation - Hyper-spectral classification - Sample classification - Spectral feature - Spectral structure - Unsupervised data

Classification code:461.4 Ergonomics and Human Factors Engineering - 716.1 Information Theory and Signal Processing - 802.3 Chemical Operations - 903.1 Information Sources and Analysis

DOI:10.3390/rs13040547

Funding details: Number: 11701337,61501456, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:Funding: This research was funded by Natural Science Foundation of China, grant number. 61501456 and 11701337, and The APC was funded by National Natural Science Foundation of China, grant number.61501456 and 11701337.

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20214911281449

Title:On-chip generation of telecommunications-compatible ultrafast time-bin entangled qubits

Authors:Yu, Hao (1, 2); Chemnitz, Mario (1); Sciara, Stefania (1); Fischer, Bennet (1); Crockett, Benjamin (1); Roztocki, Piotr (1); Little, Brent E. (3); Chu, Sai T. (4); Moss, David J. (5); Azana, Jose (1); Wang, Zhiming (2); Morandotti, Roberto (1, 2)

Author affiliation:(1) Matériaux et Télécommunications (INRS-EMT), Institut National de la Recherche Scientifique-Centre Énergie, Varennes; J3X 1S2, Canada; (2) Institute of Fundamental and Frontier Sciences, University of Science and Technology of China, Chendu; 610054, China; (3) State Key Laboratory of Transient Optics, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Science, Xi'an, China; (4) Department of Physics, City University of Hong Kong, Hong Kong, Hong Kong; (5) Optical Sciences Centre, Swinburne University of Technology, Hawthorn; VIC; 3122, Australia

Source title:2021 Conference on Lasers and Electro-Optics, CLEO 2021 - Proceedings

Abbreviated source title:Conf. Lasers Electro-Opt., CLEO - Proc.

Part number:1 of 1

Issue title:2021 Conference on Lasers and Electro-Optics, CLEO 2021 - Proceedings

Issue date:May 2021

Publication year:2021

Language:English

ISBN-13:9781943580910

Document type:Conference article (CA)

Conference name:2021 Conference on Lasers and Electro-Optics, CLEO 2021

Conference date:May 9, 2021 - May 14, 2021

Conference location:Virtual, Online, United states

Conference code:173264

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">We demonstrate telecom compatible time-entangled two-photon pairs qubits using an onchip unbalanced interferometer and spiral waveguide for state preparation/processing and generation, respectively. We show quantum interference and confirm Bell's inequality violation.<br/></div> © 2021 OSA.

Number of references:7

Main heading:Quantum entanglement

Controlled terms:Qubits

Uncontrolled terms:Entangled qubits - On chips - On-chip generation - Photon pairs - Quantum interference - Spiral waveguides - State preparation - Telecom - Two photon - Ultra-fast

Classification code:741 Light, Optics and Optical Devices - 761 Nanotechnology - 931.4 Quantum Theory; Quantum Mechanics

Database:Compendex

Accession number:20214711208024

Title:On-chip generation of telecommunications-compatible ultrafast time-bin entangled qubits

Authors:Yu, Hao (1, 2); Chemnitz, Mario (1); Sciara, Stefania (1); Fischer, Bennet (1); Crockett, Benjamin (1); Roztocki, Piotr (1); Little, Brent E. (3); Chu, Sai T. (4); Moss, David J. (5); Azaña, José (1); Wang, Zhiming (2); Morandotti, Roberto (1, 2)

Author affiliation:(1) Institut National de la Recherche Scientifique, Centre Énergie Matériaux et Télécommunications (INRS-EMT), Varennes; J3X 1S2, Canada; (2) Institute of Fundamental and Frontier Sciences, University of Science and Technology of China, Chendu; 610054, China; (3) State Key Laboratory of Transient Optics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Science, Xi'an, China; (4) Department of Physics, City University of Hong Kong, Hong Kong; (5) Optical Sciences Centre, Swinburne University of Technology, Hawthorn; VIC; 3122, Australia

Corresponding author:Yu, Hao(hao.yu@emt.inrs.ca)

Source title:Optics InfoBase Conference Papers

Abbreviated source title:Opt. InfoBase Conf. Pap

Part number:1 of 1

Issue title:CLEO: QELS_Fundamental Science, CLEO: QELS 2021

Issue date:2021

Publication year:2021

Article number:FTu4G.3

Language:English

ISBN-13:9781557528209

Document type:Conference article (CA)

Conference name:CLEO: QELS_Fundamental Science, CLEO: QELS 2021 - Part of Conference on Lasers and Electro-Optics, CLEO 2021

Conference date:May 9, 2021 - May 14, 2021

Conference location:Virtual, Online, United states

Conference code:174076

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">We demonstrate telecom compatible time-entangled two-photon pairs qubits using an on-chip unbalanced interferometer and spiral waveguide for state preparation/processing and generation, respectively. We show quantum interference and confirm Bell's inequality violation.<br/></div> © OSA 2021, © 2021 The Author(s)

Number of references:7

Main heading:Quantum entanglement

Controlled terms:Qubits

Uncontrolled terms:Entangled qubits - On chips - On-chip generation - Photon pairs - Quantum interference - Spiral waveguides - State preparation - Telecom - Two photon - Ultra-fast

Classification code:741 Light, Optics and Optical Devices - 761 Nanotechnology - 931.4 Quantum Theory; Quantum Mechanics

Database:Compendex

Accession number:20212610574504

Title:Histogram clustering for rapid time-domain fluorescence lifetime image analysis (Open Access)

Authors:Li, Yahui (1, 2); Sapermsap, Natakorn (3); Yu, Jun (4); Tian, Jinshou (1, 2); Chen, Yu (3); Li, David Day-Uei (5)

Author affiliation:(1) Key Laboratory of Ultra-fast Photoelectric Diagnostics Technology, Xi'an Institute of Optics and Precision Mechanics, Shaanxi, Xi'an; 710049, China; (2) Collaborative Innovation Center of Extreme Optics, Shanxi University, Shanxi, Taiyuan; 030006, China; (3) Department of Physics, Scottish Universities Physics Alliance, University of Strathclyde, Glasgow; G4 0NG, United Kingdom; (4) Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow; G4 0RE, United Kingdom; (5) Department of Biomedical Engineering, University of Strathclyde, Glasgow; G1 0NW, United Kingdom

Source title:Biomedical Optics Express

Abbreviated source title:Biomed. Opt. Express

Volume:12

Issue:7

Issue date:July 1, 2021

Publication year:2021

Pages:4293-4307

Language:English

E-ISSN:21567085

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">We propose a histogram clustering (HC) method to accelerate fluorescence lifetime imaging (FLIM) analysis in pixel-wise and global fitting modes. The proposed method's principle was demonstrated, and the combinations of HC with traditional FLIM analysis were explained. We assessed HC methods with both simulated and experimental datasets. The results reveal that HC not only increases analysis speed (up to 106 times) but also enhances lifetime estimation accuracy. Fast lifetime analysis strategies were suggested with execution times around or below 30 µs per histograms on MATLAB R2016a, 64-bit with the Intel Celeron CPU (2950M @ 2GHz).<br/></div> © 2021 OSA - The Optical Society. All rights reserved.

Number of references:46

Main heading:Graphic methods

Controlled terms:Fluorescence imaging - Time domain analysis

Uncontrolled terms:Fluorescence lifetime imaging - Fluorescence lifetimes - Global fitting - Histogram clustering - Lifetime analysis - Lifetime estimation - Time domain

Classification code:746 Imaging Techniques - 921 Mathematics

Numerical data indexing:Frequency 2.00e+09Hz

DOI:10.1364/BOE.427532

Funding details: Number: -, Acronym: IPST, Sponsor: Institute for the Promotion of Teaching Science and Technology;Number: EP/L01596X/1, Acronym: EPSRC, Sponsor: Engineering and Physical Sciences Research Council;Number: 1179-2017, Acronym: MRS, Sponsor: Medical Research Scotland;Number: 12075312, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: CXJJ-21S006,XDA25030900, Acronym: CAS, Sponsor: Chinese Academy of Sciences;

Funding text:Funding. Science Foundation of the Chinese Academy of Sciences (CXJJ-21S006); Strategic Priority Research Program of Chinese Academy of Sciences (XDA25030900); National Natural Science Foundation of China (12075312); Medical Research Scotland (1179-2017); Engineering and Physical Sciences Research Council (EP/L01596X/1).Acknowledgments. N. Sapermsap acknowledges the Development and Promotion of Science and Technology Talents (DPST) Project under the Institute for the Promotion of Teaching Science and Technology (IPST), Thailand, for a PhD scholarship.

Database:Compendex

Open Access type(s): All Open Access, Gold, Green

Accession number:20215211394014

Title:RF spectrum measurement of the versatile microcavity soliton combs

Authors:Hu, Hao (1); Wang, Ruolan (1); Chen, Liao (1); Wang, Weiqiang (2); Zhang, Chi (1); Zhang, Wenfu (3); Zhang, Xinliang (1)

Author affiliation:(1) Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan; 430074, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi an Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences (CAS), Xi an; 710119, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China

Corresponding author:Zhang, Xinliang(xlzhang@mail.hust.edu.cn)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11894

Part number:1 of 1

Issue title:Optoelectronic Devices and Integration X

Issue date:2021

Publication year:2021

Article number:118941B

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510646377

Document type:Conference article (CA)

Conference name:Optoelectronic Devices and Integration X 2021

Conference date:October 10, 2021 - October 12, 2021

Conference location:Nantong, China

Conference code:175373

Sponsor:Chinese Optical Society (COS); The Society of Photo-Optical Instrumentation Engineers (SPIE)

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">Dissipative Kerr solitons generated in microresonators driven by a continuous wave pump laser have promise for widespread applications in spectroscopy and telecommunications. From the perspective of basic physics research, DKSs exhibit rich nonlinear phenomena and serve as a unique platform to study nonlinear physics. In this paper, an optimized all-optical radio frequency (RF) spectrum analyzer, also named frequency domain light intensity spectrum analyzer (f-LISA), is used to characterize the various stable soliton states. Results show that the optimized f-LISA achieves a measurement bandwidth of 2.2 THz and a frame rate of 20.62 MHz. Therefore, the versatile RF spectral patterns of stable two-soliton states have successfully recorded by f-LISA. More importantly, the relative azimuthal angles between two solitons within the round-Trip can be extracted by applying an inverse Fourier transform to the RF spectra, indicating that the ultra-fast and broadband RF spectral measurement enable the visualization of soliton motion. It is believed that the f-LISA can function as a powerful and useful tool to monitor the rich nonlinear dynamical phenomena such as soliton number switching in the microresonators<br/></div> © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

Number of references:16

Main heading:Spectrum analyzers

Controlled terms:Pumping (laser) - Radio waves - Spectroscopy - Microresonators - Nonlinear optics - Solitons

Uncontrolled terms:Auto correlation - Autocorrelation trace - Dissipative kerr soliton - Frequency domains - Intensity spectrum - Kerr solitons - Light intensity - Micro resonators - Radio frequency spectrum - Radiofrequencies

Classification code:711 Electromagnetic Waves - 741.1 Light/Optics - 741.1.1 Nonlinear Optics - 744.1 Lasers, General - 744.7 Laser Components

Numerical data indexing:Frequency 2.062E+07Hz, Frequency 2.20E+12Hz

DOI:10.1117/12.2602760

Database:Compendex

Accession number:20215211394800

Title:3D printing active variable curvature mirror research for zoom imaging

Authors:Xie, Xiaopeng (1); Xu, Liang (1); Wang, Yongjie (2); Shen, Le (3); Yang, Mingyang (4); W., Fan; H., Zhao

Author affiliation:(1) Space Optical Technology Research Department, Xi an Institute of Optics and Precision Mechanics, CAS, Xi an; 710119, China; (2) Advanced Optics Manufacturing Center, Xi an Institute of Optics and Precision Mechanics, CAS, Xi an; 710119, China; (3) University of Chinese Academy of Science, Beijing; 100049, China; (4) State Key Laboratory of Transient Optics and Photonics, Xi an Institute of Optics and Precision Mechanics, CAS, Xi an; 710119, China

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11895

Part number:1 of 1

Issue title:Optical Design and Testing XI

Issue date:2021

Publication year:2021

Article number:1189505

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510646391

Document type:Conference article (CA)

Conference name:Optical Design and Testing XI 2021

Conference date:October 10, 2021 - October 12, 2021

Conference location:Nantong, China

Conference code:175374

Sponsor:Chinese Optical Society (COS); The Society of Photo-Optical Instrumentation Engineers (SPIE)

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">A variable curvature mirror (VCM) fabricated by 3D printing technique which is thickness optimized in structure design to reduce spherical aberration and supposed to be used in zoom imaging system is investigated. First, measurement and parameters fix of the mirror blank printed by 3D printing of AlSi10Mg are done for its precision deviation introduce by the manufacturing method. Second, elementary optical polishing is done for the purpose of Nickel plated. Fine optical polishing is applied on the VCM after the Nickel plated. Third, an actuation test experiment is built and tested by piezoelectric actuators of PI with nanometer precision and Zygo interferometer. The original surface figure accuracy of 90% radius is 2.225 λ / 0.394 λ (λ = 632.8 nm). As a result, within the ultimate testing range of the interferometer, the VCM achieve about 8.68μm deformation with the corresponding position change of actuator is 18μm, which is about 50% of it. Finally, an experiment of zoom imaging effect is done. The experiment shows that it does have effect to the zoom imaging which can compensate the defocus within 230.7μm. From the performance of the VCM at this stage, it can be used in infrared imaging. For the following work, its structure will be further optimized and the precision problems will be solved through using more proper manufacture method to improve its radius change performance during actuation process. Therefore, it can be used in visible light imaging in the future.<br/></div> © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

Number of references:28

Main heading:Interferometers

Controlled terms:3D printers - Aberrations - Curve fitting - Optical testing - Piezoelectric actuators - Mirrors - Thermography (imaging) - Light

Uncontrolled terms:3-D printing - 3D-printing - Active Optics - Active variables - Optical polishing - Performance - Printing techniques - Structure design - Variable curvature mirror - Zoom imaging

Classification code:704.1 Electric Components - 732 Control Devices - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 742.1 Photography - 745.1.1 Printing Equipment - 921.6 Numerical Methods - 941.3 Optical Instruments

Numerical data indexing:Percentage 5.00E+01%, Percentage 9.00E+01%, Size 1.80E-05m, Size 2.307E-04m, Size 6.328E-07m, Size 8.68E-06m

DOI:10.1117/12.2601500

Database:Compendex

Accession number:20212210433912

Title:Solving, analyzing, manufacturing, and experimental testing of thickness distribution for a cycloid-like variable curvature mirror (Open Access)

Authors:Xie, Xiaopeng (1); Xu, Liang (2); Wang, Yongjie (2); Shen, Le (2); Fan, Xuewu (1); Fan, Wenhui (3); Li, Chuang (1); Zhao, Hui (1)

Author affiliation:(1) Space Optical Technology Research Department, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, 17 Xinxi Road, Xi’an; 710119, China; (2) Advanced Optics Manufacturing Center, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, 17 Xinxi Road, Xi’an; 710119, China; (3) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, 17 Xinxi Road, Xi’an; 710119, China

Corresponding author:Zhao, Hui(zhaohui@opt.ac.cn)

Source title:Optics Express

Abbreviated source title:Opt. Express

Volume:29

Issue:12

Issue date:June 7, 2021

Publication year:2021

Pages:18010-18025

Language:English

E-ISSN:10944087

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">A cycloid-like variable curvature mirror (VCM) for zoom-imaging systems was investigated. An analytical-deformation solution to a thin-elastic plate with a cycloid-like thickness distribution and simply supported boundary condition under uniform pressure was found using a small parameter method. The finite-element analysis of the thin-elastic plate and designed VCM showed a good correlation with the analytical solution. The VCM was manufactured and polished to the initial shape with a root mean square (RMS) of 1/80λ. Finally, with air-pressure-based actuation testing under 0.07 MPa, the VCM deforms approximately 36.89 µm and maintains the RMS surface performance of 1/10λ, 1/40λ with and without spherical aberrations, respectively.<br/></div> © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.

Number of references:29

Main heading:Mirrors

Controlled terms:Thickness control - Thickness measurement - Aberrations

Uncontrolled terms:Experimental testing - Good correlations - Small parameter method - Spherical aberrations - Surface performance - Thickness distributions - Thin elastic plates - Variable curvature mirror

Classification code:731.3 Specific Variables Control - 741.3 Optical Devices and Systems - 943.2 Mechanical Variables Measurements

Numerical data indexing:Pressure 7.00e+04Pa

DOI:10.1364/OE.426989

Funding details: Number: 2016KJXX-08, Acronym: -, Sponsor: Research Fund for Young Star of Science and Technology in Shaanxi Province;Number: XAB2015A09, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: -, Acronym: CSC, Sponsor: China Scholarship Council;

Funding text:Funding. West Light Foundation of the Chinese Academy of Sciences (XAB2015A09); Research Fund for Young Star of Science and Technology in Shaanxi Province (2016KJXX-08); China Scholarship Council.

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20214511112570

Title:Optical design of an integrated imaging system of optical camera and synthetic aperture radar (Open Access)

Authors:Li, Ruichang (1, 2); Feng, Liangjie (1); Xu, Kaijiang (3); Wang, Nan (1); Fan, Xuewu (1)

Author affiliation:(1) Space Optical Technology Research Department, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Science, 17 Xinxi Road, Xi’an; 710119, China; (2) University of Chinese Academy of Science, 19 Yuquan Road, Beijing; 100049, China; (3) Department of Spaceborne Microwave Remote Sensing System, Aerospace Information Research Institute, Chinese Academy of Science, 9 Dengzhuang South Road, Beijing; 100190, China

Corresponding author:Fan, Xuewu(fanxuewu@opt.ac.cn)

Source title:Optics Express

Abbreviated source title:Opt. Express

Volume:29

Issue:22

Issue date:October 25, 2021

Publication year:2021

Pages:36796-36812

Language:English

E-ISSN:10944087

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">This paper presents an integrated imaging system of optical camera and synthetic aperture radar (SAR). The system can realize 400 nm–900 nm visible and near infrared band and 35 GHz microwave Ka band dual-band imaging. Compared with the single band imaging system, the observation ability and environmental adaptability of the integrated imaging system have been significantly improved. The optical camera shares a common front system with the synthetic aperture radar. After simulation, the average modulation transfer function (MTF) of 50 line pairs per millimeter (lp/mm) of the optical subsystem is 0.47. In addition, a principle prototype with a pupil diameter of 210 mm was developed to verify the performance of synthetic aperture radar antennas. After the experimental test, the SAR radiation pattern simulation results are in good conformity with the measured results, which are in line with the expected results.<br/></div> © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Number of references:19

Main heading:Synthetic aperture radar

Controlled terms:Radar imaging - Infrared devices - Imaging systems - Antenna arrays - Cameras - Optical design - Radar antennas - Directional patterns (antenna)

Uncontrolled terms:Dual Band - Environmental adaptability - Integrated imaging systems - Ka band - Near infrared band - Optical camera - Optical subsystems - Pupil diameter - Single band - Visible and near infrared

Classification code:716.2 Radar Systems and Equipment - 741.1 Light/Optics - 742.2 Photographic Equipment - 746 Imaging Techniques

Numerical data indexing:Frequency 3.50E+10Hz, Size 2.10E-01m, Size 4.00E-07m, Size 9.00E-07m

DOI:10.1364/OE.438979

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20214911288206

Title:On-chip generation and characterization of densely-spaced time-bin entangled qubits

Authors:Yu, Hao (1, 2); Chemnitz, Mario (1); Sciara, Stefania (1); Fischer, Bennet (1); Crockett, Benjamin (1); Roztocki, Piotr (1); Little, Brent E. (2); Chu, Sai T. (3); Moss, David J. (4); Azaña, José (5); Wang, Zhiming (2); Morandotti, Roberto (1, 2)

Author affiliation:(1) Institut National de la Recherche Scientifique - Centre ÉNergie, Matériaux et Télécommunications (INRS-EMT), Varennes; J3X 1S2, Canada; (2) Institute of Fundamental and Frontier Sciences, University of Science and Technology of China, Chengdu; 610054, China; (3) State Key Laboratory of Transient Optics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Science, Xi'an, China; (4) Department of Physics, City University of Hong Kong, Hong Kong; (5) Optical Sciences Centre, Swinburne University of Technology, Hawthorn; VIC; 3122, Australia

Corresponding author:Yu, Hao(hao.yu@emt.inrs.ca)

Source title:Optics InfoBase Conference Papers

Abbreviated source title:Opt. InfoBase Conf. Pap

Part number:1 of 1

Issue title:Signal Processing in Photonic Communications, SPPCom 2021

Issue date:2021

Publication year:2021

Article number:SpF2E.6

Language:English

ISBN-13:9781557528209

Document type:Conference article (CA)

Conference name:Signal Processing in Photonic Communications, SPPCom 2021 - Part of OSA Advanced Photonics Congress 2021

Conference date:July 26, 2021 - July 29, 2021

Conference location:Virtual, Online, United states

Conference code:174327

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">By using an on-chip unbalanced interferometer for densely-spaced time-bin state preparation/processing and a spiral waveguide for photon-pair generation, we demonstrate and implement high-quality densely-spaced time-entangled two-photon qubits.<br/></div> © 2021 OSA - The Optical Society. All rights reserved.

Number of references:7

Database:Compendex

Accession number:20211310131951

Title:Nonlinear calibration of frequency modulated continuous wave LIDAR based on a microresonator soliton comb

Authors:Jia, Linhua (1); Wang, Yang (2, 3); Wang, Xinyu (2, 3); Zhang, Fumin (1); Wang, Weiqiang (2); Wang, Jindong (1); Zheng, Jihui (1); Chen, Jiawei (1); Song, Mingyu (1); Ma, Xin (1); Yuan, Meiyan (2, 3); Little, Brent (2, 3); Chu, Sai Tek (4); Cheng, Dong (2, 3); Qu, Xinghua (1); Zhao, Wei (2, 3); Zhang, Wenfu (2, 3)

Author affiliation:(1) State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin; 300072, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China; (4) Department of Physics and Materials Science, City University of Hong Kong, Hong Kong

Source title:Optics Letters

Abbreviated source title:Opt. Lett.

Volume:46

Issue:5

Issue date:March 1, 2021

Publication year:2021

Pages:1025-1028

Language:English

ISSN:01469592

E-ISSN:15394794

CODEN:OPLEDP

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:Traditional frequency modulated continuous wave (FMCW) LIDAR ranging is based on heterodyne detection, calculating unknown distance by extracting the frequency of the interference signal, while the main error source is frequency modulation (FM) nonlinearity. In this paper, a ranging system based on a microresonator soliton comb is demonstrated to correct the nonlinearity by sampling the ranging signals at equal frequency intervals, producing a ranging error lower than 20 µm, while at the range of 2 m. Advantages of fast data acquisition, light computation requirements, and a simple optical path, without long optical fiber, give this method a high practical value in precision manufacturing.<br/> © 2021 Optical Society of America

Number of references:13

Main heading:Solitons

Controlled terms:Optical fibers - Microresonators - Data acquisition - Heterodyne detection - Optical radar - Frequency modulation

Uncontrolled terms:Fast data acquisition - Frequency intervals - Frequency-modulated continuous waves - Interference signal - Main error sources - Micro resonators - Nonlinear calibration - Precision manufacturing

Classification code:716.1 Information Theory and Signal Processing - 716.2 Radar Systems and Equipment - 723.2 Data Processing and Image Processing - 741.1 Light/Optics - 741.1.2 Fiber Optics - 741.3 Optical Devices and Systems - 744.7 Laser Components

Numerical data indexing:Size 2.00e+00m

DOI:10.1364/OL.415524

Funding details: Number: 18YFZCGX00920, Acronym: -, Sponsor: -;Number: 51675380,51775379,61635013,61675231,61705257,61805277,62075238, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2016353,XDB24030600, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2018YFB2003501,2018YFF0212702, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;Number: -, Acronym: YIPA, Sponsor: Youth Innovation Promotion Association;

Funding text:Funding. National Natural Science Foundation of China (51675380, 51775379, 61635013, 61675231, 61705257, 61805277, 62075238); Key Projects Supported by Science and Technology of Tianjin, China (18YFZCGX00920); Youth Innovation Promotion Association, Chinese Academy of Sciences (2016353); Strategic Priority Research Program of the Chinese Academy of Sciences (XDB24030600); National Key Research and Development Program of China (2018YFB2003501, 2018YFF0212702).

Database:Compendex

Accession number:20220148402

Title:Atomistic Evidence of Nucleation Mechanism for the Direct Graphite-to-Diamond Transformation

Authors:Luo, Duan (1); Yang, Liuxiang (2); Xie, Hongxian (3); Srinivasan, Srilok (1); Tian, Jinshou (4); Sankaranarayanan, Subramanian (1); Arslan, Ilke (5); Yang, Wenge (2); Mao, Ho-Kwang (2); Wen, Jianguo (5)

Author affiliation:(1) Argonne National Laboratory, United States; (2) Center for High Pressure Science and Technology Advanced Research, China; (3) Hebei University of Technology, China; (4) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, China; (5) Pacific Northwest National Laboratory, United States

Corresponding author:Wen, Jianguo(jwen@anl.gov)

Source title:ResearchSquare

Abbreviated source title:ResearchSquare

Issue date:December 2, 2021

Publication year:2021

Language:English

Document type:Preprint (PP)

Publisher:ResearchSquare

Abstract:<div data-language="eng" data-ev-field="abstract">The direct graphite-to-diamond transformation mechanism has been a subject of intense study and remains debated concerning the initial stages of the conversion, the intermediate phases, and their transformation pathways. Here, we successfully recover samples at early conversion stage by tuning high-pressure/high-temperature conditions and reveal direct evidence supporting the nucleation-growth mechanism. Atomistic observations show that intermediate orthorhombic graphite phase mediates the growth of diamond nuclei. Furthermore, we observe that quenchable orthorhombic and rhombohedra graphite are stabilized in buckled graphite at lower temperatures. These intermediate phases are further converted into hexagonal and cubic diamond at higher temperatures following energetically favorable pathways in the order: graphite -> orthorhombic graphite -> hexagonal diamond, graphite -> orthorhombic graphite -> cubic diamond, graphite -> rhombohedra graphite -> cubic diamond. These results significantly improve our understanding of the transformation mechanism, enabling the synthesis of different high-quality forms of diamond from graphite.<br/></div> © 2021, CC BY.

Number of references:44

Main heading:Graphite

Controlled terms:Diamonds - Nucleation

Classification code:482.2.1 Gems - 933.1.2 Crystal Growth

DOI:10.21203/rs.3.rs-1091313

Database:Compendex

Accession number:20212610569967

Title:Photonic microwave and RF channelizers based on Kerr micro-combs

Authors:Tan, M. (1); Xu, X. (2); Wu, J. (1); Boes, A. (3); Nguyen, T.G. (3); Chu, S.T. (4); Little, B.E. (5); Morandotti, R. (6); Mitchell, A. (3); Moss, D.J. (1)

Author affiliation:(1) Optical Sciences Centre, Swinburne University of Technology, Hawthorn; VIC; 3122, Australia; (2) Dept. of Electrical and Computer Systems Engineering, Monash University, Clayton; VIC; 3800, Australia; (3) School of Engineering, Rmit University, Melbourne; VIC; 3001, Australia; (4) Department of Physics and Material Science, City University of Hong Kong, Tat Chee Avenue, Hong Kong; (5) Xi'an Institute of Optics and Precision Mechanics Precision Mechanics of Cas, Xi'an, China; (6) INRS-Énergie, Matériaux et Télécommunications, 1650 Boulevard Lionel-Boulet, Varennes; QC; J3X 1S2, Canada

Corresponding author:Moss, D.J.(dmoss@swin.edu.au)

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11685

Part number:1 of 1

Issue title:Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XIV

Issue date:2021

Publication year:2021

Article number:116850P

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510642058

Document type:Conference article (CA)

Conference name:Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XIV 2020

Conference date:March 6, 2021 - March 11, 2021

Conference location:Virtual, Online, United states

Conference code:169674

Sponsor:The Society of Photo-Optical Instrumentation Engineers (SPIE)

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">We review recent work on broadband RF channelizers based on integrated optical frequency Kerr microcombs combined with passive micro-ring resonator filters, with microcombs having channel spacings of 200GHz and 49GHz. This approach to realizing RF channelizers offers reduced complexity, size, and potential cost for a wide range of applications to microwave signal detection.<br/></div> © 2021 SPIE.

Number of references:184

Main heading:Natural frequencies

Controlled terms:Microwave filters - Optical materials - Microwave resonators - Optical resonators

Uncontrolled terms:Channel spacings - Channelizers - Microcombs - Microring resonator - Microwave signal detection - Optical frequency - Photonic microwave - Reduced complexity

Classification code:703.2 Electric Filters - 714 Electronic Components and Tubes - 741.3 Optical Devices and Systems

Numerical data indexing:Frequency 2.00e+11Hz, Frequency 4.90e+10Hz

DOI:10.1117/12.2584015

Database:Compendex

Accession number:20213710883767

Title:Free carrier induced dark pulse generation in microresonators

Authors:Liu, Mulong (1); Shi, Wenmi (1); Sun, Qiyuan (1); Huang, Huimin (2); Lu, Zhizhou (3); Wang, Yuanyuan (1); Cai, Yanan (1); Wang, Chang (1); Li, Yao (4); Zhao, Wei (5)

Author affiliation:(1) School of Science, Northwest A&F University, Yangling; 712100, China; (2) College of Information Engineering, Northwest A&F University, Yangling; 712100, China; (3) Chongqing United Microelectronics Center (CUMEC), Xiyuan South Street, Chongqing; 401332, China; (4) College of Optoelectronic Engineering, Xi’an Technological University, Xi’an; 710119, China; (5) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences (CAS), Xi’an; 710119, China

Source title:Optics Letters

Abbreviated source title:Opt. Lett.

Volume:46

Issue:18

Issue date:September 15, 2021

Publication year:2021

Pages:4462-4465

Language:English

ISSN:01469592

E-ISSN:15394794

CODEN:OPLEDP

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">We theoretically demonstrate a novel, to the best of our knowledge, mechanism for dark pulse excitation in normal dispersion microresonators exploiting free carrier dispersion and free carrier absorption effects due to multi-photon absorption. Dark pulses can be generated in the three- and four-photon absorption regimes in the presence or absence of external reverse bias to control the lifetime of free carriers, respectively. Direct generation of dark pulses is proven to be feasible in both regimes with a frequency fixed laser. The dynamics of their temporal and spectral evolution have also been investigated. Our findings establish a reliable path for dark pulse and Kerr microcomb generation in related platforms with simplified controlling and tuning techniques.<br/></div> © 2021 Optical Society of America.

Number of references:33

Main heading:Photons

Controlled terms:Light absorption - Dispersions - Microresonators

Uncontrolled terms:Direct generation - Free carrier absorption - Free carriers - Micro resonators - Multi-photon absorption - Normal dispersion - Photon absorptions - Spectral evolution

Classification code:741.1 Light/Optics - 744.7 Laser Components - 931.3 Atomic and Molecular Physics - 951 Materials Science

DOI:10.1364/OL.435668

Funding details: Number: 52002331, Acronym: NNSFC, Sponsor: National Natural Science Foundation of China;Number: XDB24030600, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2452020264,2452021016, Acronym: -, Sponsor: Chinese Universities Scientific Fund;

Funding text:Funding. Chinese Universities Scientific Fund (2452020264, 2452021016); Strategic Priority Research Program of the Chinese Academy of Sciences (XDB24030600); National Natural Science Foundation of China (52002331).

Database:Compendex

Accession number:20214111016872

Title:Frequency Comb Distillation for Optical Superchannel Transmission (Open Access)

Authors:Prayoonyong, Chawaphon (1); Boes, Andreas (2); Xu, Xingyuan (3); Tan, Mengxi (4); Chu, Sai T. (5); Little, Brent E. (6); Morandotti, Roberto (7); Mitchell, Arnan (2); Moss, David J. (4); Corcoran, Bill (1)

Author affiliation:(1) Photonic Communications Laboratory, Department of Electrical and Computer Systems Engineering, Monash University, Clayton; VIC, Australia; (2) Integrated Photonics and Applications Centre (InPAC) Within the School of Engineering, RMIT University, Melbourne; VIC, Australia; (3) Centre for Micro-Photonics, Swinburne University, Hawthorn; VIC, Australia; (4) Optical Sciences Centre, Swinburne University, Hawthorn; VIC, Australia; (5) Department of Physics, City University of Hong Kong, Tat Chee Ave, Hong Kong, Hong Kong; (6) Xi'An Institute of Optics and Precision Mechanics of the Chinese Academy of Sciences, Xi'an, China; (7) INRS - EMT, Varennes; QC, Canada

Corresponding author:Prayoonyong, Chawaphon(prayoonyong@monash.edu)

Source title:Journal of Lightwave Technology

Abbreviated source title:J Lightwave Technol

Volume:39

Issue:23

Issue date:December 1, 2021

Publication year:2021

Pages:7383-7392

Language:English

ISSN:07338724

E-ISSN:15582213

CODEN:JLTEDG

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">Optical frequency combs can potentially provide an efficient light source for multi-terabit-per-second optical superchannels. However, as the bandwidth of these multi-wavelength light sources is increased, it can result in low per-line power. Optical amplifiers can be used to overcome power limitations, but the accompanying spontaneous optical noise can degrade performance in optical systems. To overcome this, we demonstrate wideband noise reduction for comb lines using a high-Q microring resonator whose resonances align with the comb lines, providing tight optical filtering of multiple combs lines at the same time. By distilling an optical frequency comb in this way, we are able to reduce the required comb line OSNR when these lines are used in a coherent optical communications system. Through performance tests on a 19.45-GHz-spaced comb generating 71 lines, using 18 Gbaud, 64-QAM sub-channels at a spectral efficiency of 10.6 b/s/Hz, we find that noise-corrupted comb lines can reduce the optical signal-to-noise ratio required for the comb by &sim;9 dB when used as optical carriers at the transmitter side, and by &sim;12 dB when used as a local oscillator at the receiver side. This demonstration provides a method to enable low power optical frequency combs to be able to support high bandwidth and high-capacity communications.<br/></div> © 1983-2012 IEEE.

Number of references:56

Main heading:Natural frequencies

Controlled terms:Optical materials - Optical systems - Bandwidth - Signal receivers - Light sources - Light transmission - Distillation - Microresonators - Signal to noise ratio

Uncontrolled terms:Coherent optical systems - Micro resonators - Narrow bands - Narrowband filtering - Optical frequency combs - Optical noise - Optical superchannel - Optical-fiber communication - Optical-frequency combs - OSNR penalty

Classification code:716.1 Information Theory and Signal Processing - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 744.7 Laser Components - 802.3 Chemical Operations

Numerical data indexing:Decibel 1.20E+01dB, Decibel 9.00E+00dB, Frequency 1.945E+10Hz, Spectral efficiency 1.06E+01bit/s/Hz

DOI:10.1109/JLT.2021.3116614

Funding details: Number: DP190102773, Acronym: ARC, Sponsor: Australian Research Council;

Database:Compendex

Open Access type(s): All Open Access, Bronze, Green

Accession number:20211010043642

Title:A Real-Time Star Tailing Removal Method Based on Fast Blur Kernel Estimations (Open Access)

Authors:Hou, Yaxian (1, 2, 3); Zhao, Rujin (1, 2, 3); Ma, Yuebo (1, 2, 3); He, Longdong (1, 2, 3); Zhu, Zifa (1, 2, 3)

Author affiliation:(1) Institute of Optics and Electronics of Chinese Academy of Sciences, Chengdu; 610209, China; (2) University of Chinese Academy of Sciences, Beijing; 100149, China; (3) Key Laboratory of Science and Technology on Space Optoelectronic Precision Measurement, CAS, Xi'an, China

Corresponding author:Zhao, Rujin(zrj0515@163.com)

Source title:Mathematical Problems in Engineering

Abbreviated source title:Math. Probl. Eng.

Volume:2021

Issue date:2021

Publication year:2021

Article number:8819277

Language:English

ISSN:1024123X

E-ISSN:15635147

Document type:Journal article (JA)

Publisher:Hindawi Limited

Abstract:The number of star points and the accuracy of star centroid extraction are the key factors that affect the performance of the star sensor under high dynamic conditions. The motion blur results in the star point trailing, which consequently leads to the decline of star centroid extraction accuracy and in some cases lead to extraction failure. In order to improve the dynamic performance of the star sensor, in this work, we propose a real-time star trailing removal method based on fast blur kernel estimation. First, in order to minimize the influence of noise on parameter estimation, we use principal component analysis (PCA) in the dual-frequency spectrum domain to estimate the angle of blur kernel. In addition, an adjustable weighting method is proposed to estimate the length of blur kernel. So, we are able to quickly estimate the high-precision blur kernel based on a single degraded image. Moreover, an area filtering method based on the hyper-Laplacian prior recovery algorithm is also proposed. This algorithm quickly reconstructs the star points in the tracking windows and effectively removes the star point tailing in real time. The computational efficiency of the proposed algorithm is 5 times superior to the traditional method and 15 times superior to the existing accelerated iterative method. The experimental results show that the proposed algorithm removes the trailing star quickly and effectively, under low SNR. In addition, the proposed method effectively improves the number of extracted star points and the accuracies of star centroids.<br/> © 2021 Yaxian Hou et al.

Number of references:37

Main heading:Stars

Controlled terms:Signal to noise ratio - Frequency domain analysis - Extraction - Frequency estimation - Principal component analysis - Computational efficiency - Iterative methods

Uncontrolled terms:Blur kernel estimations - Centroid extractions - Degraded images - Dual frequency - Dynamic performance - Filtering method - Recovery algorithms - Weighting methods

Classification code:657.2 Extraterrestrial Physics and Stellar Phenomena - 716.1 Information Theory and Signal Processing - 802.3 Chemical Operations - 921.3 Mathematical Transformations - 921.6 Numerical Methods - 922.2 Mathematical Statistics

DOI:10.1155/2021/8819277

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20220711629870

Title:Neuromorphic processing at 11 Tera-OPs with soliton crystal Kerr microcombs

Authors:Tan, M. (1); Xu, X. (2); Wu, J. (1); Boes, A. (3); Corcoran, B. (2); Nguyen, T. (3); Chu, S.T. (4); Little, B.E. (5); Morandotti, R. (6); Mitchell, A. (3); Moss, D.J. (1)

Author affiliation:(1) Optical Sciences Centre, Swinburne University of Technology, Hawthorn; VIC; 3122, Australia; (2) Dept. of Electrical and Computer Systems Engineering, Monash University, Clayton; VIC; 3800, Australia; (3) School of Engineering, RMIT University, Melbourne; VIC; 3001, Australia; (4) Department of Physics and Material Science, City University of Hong Kong, Tat Chee Avenue, Hong Kong; (5) Xi'an Institute of Optics and Precision Mechanics Precision Mechanics of CAS, Xi'an, China; (6) INRS-Énergie, Matériaux et Télécommunications, 1650 Boulevard Lionel-Boulet, Varennes; QC; J3X 1S2, Canada

Source title:LEOS Summer Topical Meeting

Abbreviated source title:LEOS Summer Top Meet

Volume:2021-July

Part number:1 of 1

Issue title:2021 IEEE Photonics Society Summer Topicals Meeting Series, SUM 2021 - Proceedings

Issue date:2021

Publication year:2021

Language:English

ISSN:10994742

ISBN-13:9781665416009

Document type:Conference article (CA)

Conference name:2021 IEEE Photonics Society Summer Topicals Meeting Series, SUM 2021

Conference date:July 19, 2021 - July 21, 2021

Conference location:Virtual, Online, Mexico

Conference code:176800

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">We report a new approach to ONNs based on integrated Kerr micro-combs that is programmable, highly scalable and capable of reaching ultra-high speeds. We demonstrate a single neuron perceptron at 11.9 Giga-OPS at 8 bits per OP, or 95.2 Gbps. We then demonstrate a convolutional accelerator operating beyond 11 TeraOPs/s (TOPs). We test the perceptron on handwritten-digit recognition and cancer-cell detection - achieving over 90% and 85% accuracy, respectively.<br/></div> © 2021 IEEE.

Number of references:8

Main heading:Character recognition

Controlled terms:Crystals

Uncontrolled terms:Cancer cell detection - Gigas - Handwritten digit recognition - Microcombs - Neuromorphic - New approaches - Single neuron - Ultra high speed

Classification code:933.1 Crystalline Solids

Numerical data indexing:Bit rate 9.52E+10bit/s, Percentage 8.50E+01%, Percentage 9.00E+01%

DOI:10.1109/SUM48717.2021.9505771

Database:Compendex

Accession number:20212410511215

Title:Effects of ceo<inf>2</inf> and sb<inf>2</inf> o<inf>3</inf> on the nonlinear photochemical process in ultrashort laser gaussian—bessel beams irradiated photo—thermo—refractive glass (Open Access)

Authors:Wang, Xu (1, 2); Zhang, Guodong (3); Li, Guangying (1, 2); Lou, Rui (1, 2); Sun, Zhe (4); Xie, Xiaoping (1, 2); Li, Weinan (1); Cheng, Guanghua (3)

Corresponding authors:Li, Weinan(liweinan@opt.ac.cn); Cheng, Guanghua(guanghuacheng@nwpu.edu.cn)

Source title:Micromachines

Abbreviated source title:Micromachines

Volume:12

Issue:6

Issue date:June 2021

Publication year:2021

Article number:615

Language:English

E-ISSN:2072666X

Document type:Journal article (JA)

Publisher:MDPI AG

Abstract:<div data-language="eng" data-ev-field="abstract">Microfluidic chips and optical elements can be fabricated based on the nonlinear photo-sensitivity in photo–thermo–refractive (PTR) glass by controlling the growth of nanocrystals in the femtosecond (fs) laser–irradiated region. Here, we focus on CeO<inf>2</inf> and Sb<inf>2</inf> O<inf>3</inf> that play important roles in UV irradiation, experimentally investigate the effects of the dopants on the nonlinear photochemical process in PTR glass triggered by fs Gaussian–Bessel beams. The results show that the generation of Ag<sup>0</sup> atoms and the Ag nanoparticles can be improved by CeO<inf>2</inf> and Sb<inf>2</inf> O<inf>3</inf> co–doping. Besides, each multivalent ion in PTR glass possibly participates in the electron transfer processes and contributes to the generation of Ag<sup>0</sup> atoms. Finally, X–ray diffraction analysis reveals the precipitation of NaF nanocrystals with an average size of 10 to 12 nm after laser irradiation and thermal treatment, which is unrelated to the dopants.<br/></div> © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Number of references:39

Main heading:Nanocrystals

Controlled terms:Cerium oxide - Gaussian distribution - Gaussian beams - Fabrication - Irradiation - Optical waveguides - Sodium compounds - Silver nanoparticles - Laser beams - Glass - Image processing

Uncontrolled terms:Ag nanoparticle - Diffraction analysis - Electron transfer process - Femtosecond (fs) laser - Microfluidic chip - Photochemical process - Refractive glass - Ultrashort Laser

Classification code:711 Electromagnetic Waves - 714.3 Waveguides - 723.2 Data Processing and Image Processing - 741.3 Optical Devices and Systems - 744.8 Laser Beam Interactions - 761 Nanotechnology - 804.2 Inorganic Compounds - 812.3 Glass - 922.1 Probability Theory - 922.2 Mathematical Statistics - 933.1 Crystalline Solids

Numerical data indexing:Size 1.00e-08m to 1.20e-08m

DOI:10.3390/mi12060615

Funding text:Funding: This research was funded by the National Key Research and Development Program (2018YFB1107401) and the Natural National Science Foundation of China (NSFC) (61775236).

Database:Compendex

Open Access type(s): All Open Access, Gold, Green

Accession number:20212810608557

Title:Nanoscale vacuum diode based on thermionic emission for high temperature operation (Open Access)

Authors:Shen, Zhihua (1); Li, Qiaoning (1); Wang, Xiao (2); Tian, Jinshou (3); Wu, Shengli (4)

Author affiliation:(1) School of Electronics and Information Engineering, Nantong Vocational University, Nantong; 226007, China; (2) School of Electronic Information and Artificial Intelligence, Shaanxi University of Science and Technology, Xi’an; 710049, China; (3) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics of CAS, Xi’an; 710119, China; (4) Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Xi’an Jiaotong University, Xi’an; 710049, China

Corresponding authors:Shen, Zhihua(shenzh@mail.ntvu.edu.cn); Wang, Xiao(wangxiao@sust.edu.cn)

Source title:Micromachines

Abbreviated source title:Micromachines

Volume:12

Issue:7

Issue date:July 2021

Publication year:2021

Article number:729

Language:English

E-ISSN:2072666X

Document type:Journal article (JA)

Publisher:MDPI AG

Abstract:<div data-language="eng" data-ev-field="abstract">Vacuum diodes, based on field emission mechanisms, demonstrate a superior performance in high-temperature operations compared to solid-state devices. However, when considering low operating voltage and continuous miniaturization, the cathode is usually made into a tip structure and the gap between cathode and anode is reduced to a nanoscale. This greatly increases the difficulty of preparation and makes it difficult to ensure fabrication consistency. Here, a metalinsulator-semiconductor (MIS) structural nanoscale vacuum diode, based on thermionic emission, was numerically studied. The results indicate that this device can operate at a stable level in a wide range of temperatures, at around 600 degrees Kelvin above 260 K at 0.2 V voltage bias. Moreover, unlike the conventional vacuum diodes working in field emission regime where the emission current is extremely sensitive to the gap-width between the cathode and the anode, the emission current of the proposed diode shows a weak correlation to the gap-width. These features make this diode a promising alternative to vacuum electronics for large-scale production and harsh environmental applications.<br/></div> © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Number of references:21

Main heading:Thermionic emission

Controlled terms:Anodes - Field emission - High temperature operations - Field emission displays - Nanotechnology - Semiconductor diodes - Field emission cathodes

Uncontrolled terms:Cathode and anode - Environmental applications - Field emission mechanism - Large scale productions - Low operating voltage - Metal-insulator-semiconductors - Vacuum electronics - Weak correlation

Classification code:714.1 Electron Tubes - 714.2 Semiconductor Devices and Integrated Circuits - 761 Nanotechnology

Numerical data indexing:Temperature 2.60e+02K, Voltage 2.00e-01V

DOI:10.3390/mi12070729

Funding details: Number: 20KJD510001, Acronym: -, Sponsor: -;Number: 62004108,62004120, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:Funding: This research was funded by National Natural Science Foundation of China, grant number 62004108, 62004120. And this research was also funded by Natural Science Foundation for Universities of Jiangsu Province, China, grant number 20KJD510001.

Database:Compendex

Open Access type(s): All Open Access, Gold, Green

Accession number:20213110698317

Title:Spin-decoupled metasurface for broadband and pixel-saving polarization rotation and wavefront control (Open Access)

Authors:Ji, Ruonan (1); Song, Kun (1); Guo, Xuyue (1); Xie, Xin (1); Zhao, Yang (1); Jin, Chuan (2); Wang, Shaowei (3); Jiang, Chengming (4); Yin, Jianbo (1); Y., Liu; S., Zhai; X., Zhao; W., Lu

Author affiliation:(1) Smart Materials Lab, School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an; 710129, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics of CAS, Xi’an; 710119, China; (3) State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai; 200083, China; (4) School of Mechanical Engineering, Dalian University of Technology, Dalian; 116023, China

Source title:Optics Express

Abbreviated source title:Opt. Express

Volume:29

Issue:16

Issue date:August 2, 2021

Publication year:2021

Pages:25720-25730

Language:English

E-ISSN:10944087

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">In this paper, a strategy to achieve a simultaneous wavefront shaping and polarization rotation, without compromising the number of pixels and energy efficiency as well as having broadband operation range, is proposed. This strategy is based on the application of a spin-decoupled phase metasurface composed by only one set of metal-insulator-metal (MIM) umbrella-shaped chiral unit cells. Quasi-non-dispersive and spin-decoupled phase shift can be achieved simply by changing single structural parameter of the structure. By further merging the Pancharatnam-Berry (PB) geometric phase, conversion of an incident LP light beam into right- and left-handed circularly polarized reflected beams with similar amplitudes, desired phase profiles and controlled phase retardation on a nanoscale is enabled with high efficiency. Based on the proposed strategy, a polarization-insensitive hologram generator with control optical activity, and a multiple ring vortex beam generator are realized. The results obtained in this work provide a simple and pixel-saving approach to the design of integratable and multitasking devices combining polarization manipulation and wavefront shaping functions, such as vectorial holographic generators, multifocal metalenses, and multichannel vector beam generators.<br/></div> © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.

Number of references:32

Main heading:Energy efficiency

Controlled terms:Holograms - Wavefronts - Vortex flow - Incident light - Pixels - Polarization - Metal insulator boundaries

Uncontrolled terms:Broadband operation - Circularly polarized - Metal insulator metals - Polarization rotation - Polarization-insensitive - Structural parameter - Wave front control - Wave front shaping

Classification code:525.2 Energy Conservation - 631.1 Fluid Flow, General - 741.1 Light/Optics - 743 Holography

DOI:10.1364/OE.431740

Funding details: Number: 11804278,61601375,61805204, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 310202011qd002, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;Number: 095920211306, Acronym: XAST, Sponsor: Xi'an Science and Technology Association;Number: 2019JQ-083,2019JQ-133, Acronym: -, Sponsor: Natural Science Basic Research Program of Shaanxi Province;

Funding text:Funding. National Natural Science Foundation of China (11804278, 61601375, 61805204); Xi’an Science and Technology Association Youth Talent Support Project (095920211306); Natural Science Basic Research Program of Shaanxi Province (2019JQ-083, 2019JQ-133); Fundamental Research Funds for the Central Universities (310202011qd002).

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20224012832591

Title:Self-locked optical parametric oscillation in a highly doped silica glass slot ring resonator

Authors:Li, Guangkuo (1); Li, Yuhua (2); Li, Qian (3); Wang, Shao Hao (4); Zhu, Xiaotian (5); Davidson, Roy (5); Little, Brent E. (5, 6); Chu, Sai T. (1)

Author affiliation:(1) Department of Physics, City University of Hong Kong, Kowloon Tong, Hong Kong; (2) Key Laboratory of Optical Field Manipulation of Zhejiang Province, Department of Physics, Zhejiang Sci-Tech University, Hangzhou, China; (3) School of Electronic and Computer Engineering, Peking University, Shenzhen, China; (4) Department of Microelectronics Science and Technology, Fuzhou University, Qi Shan Campus, Fuzhou, China; (5) QXP Technology Inc., Xi'an, China; (6) State Key Laboratory of Transient Optics and Photonics, XIOPM, CAS, Xi'an, China

Corresponding author:Chu, Sai T.(saitchu@cityu.edu.hk)

Source title:2021 Opto-Electronics and Communications Conference, OECC 2021

Abbreviated source title:Opto-Electron. Commun. Conf., OECC

Part number:1 of 1

Issue title:2021 Opto-Electronics and Communications Conference, OECC 2021

Issue date:2021

Publication year:2021

Language:English

ISBN-13:9781943580927

Document type:Conference article (CA)

Conference name:2021 Opto-Electronics and Communications Conference, OECC 2021

Conference date:July 3, 2021 - July 7, 2021

Conference location:Hong Kong, Hong kong

Conference code:182432

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">We demonstrate a broadband optical parametric oscillation with a 200 GHz highly doped silica glass slot ring resonator by the self-locked scheme.<br/></div> ©2021 The Author(s)

Number of references:8

Main heading:Glass

Controlled terms:Optical resonators - Silica

Uncontrolled terms:Doped silicas - Optical parametric oscillations - Ring resonator - Silica-glass - Slot-ring

Classification code:741.3 Optical Devices and Systems - 812.3 Glass

Numerical data indexing:Frequency 2.00E+11Hz

Database:Compendex

Accession number:20214811222086

Title:Self-locked optical parametric oscillation in a highly doped silica glass slot ring resonator

Authors:Li, Guangkuo (1); Li, Yuhua (2); Li, Qian (3); Wang, Shao Hao (4); Zhu, Xiaotian (5); Davidson, Roy (5); Little, Brent E. (5, 6); Chu, Sai T. (1)

Corresponding author:Chu, Sai T.(saitchu@cityu.edu.hk)

Source title:Optics InfoBase Conference Papers

Abbreviated source title:Opt. InfoBase Conf. Pap

Part number:1 of 1

Issue title:Optoelectronics and Communications Conference, OECC 2021

Issue date:2021

Publication year:2021

Article number:JS3E.5

Language:English

ISBN-13:9781557528209

Document type:Conference article (CA)

Conference name:26th Optoelectronics and Communications Conference, OECC 2021

Conference date:July 3, 2021 - July 7, 2021

Conference location:Virtual, Online, China

Conference code:174150

Publisher:The Optical Society

Number of references:8

Main heading:Glass

Controlled terms:Silica - Optical resonators

Uncontrolled terms:Doped silicas - Optical parametric oscillations - Ring resonator - Silica-glass - Slot-ring

Classification code:741.3 Optical Devices and Systems - 812.3 Glass

Numerical data indexing:Frequency 2.00E+11Hz

Database:Compendex

Accession number:20210809951145

Title:Sub-7 fs radially-polarized pulses by post-compression in thin fused silica plates (Open Access)

Authors:Cao, Huabao (1, 2); R.S., Nagymihaly; N., Khodakovskiy; V., Pajer; J., Bohus; R., Lopez-Martens; A., Borzsonyi; M., Kalashnikov

Author affiliation:(1) ELI-ALPS, ELI-HU Non-Profit Ltd., Wolfgang Sandner u. 3, Szeged; 6728, Hungary; (2) Xi’an Institute of Optics and Precision Mechanics of CAS, Xi’an; 710119, China; (3) Laboratoire d’Optique Appliquée, CNRS, Ecole Polytechnique, ENSTA Paris, Institut Polytechnique deParis, 181 chemin de la Hunière et des Joncherettes, Palaiseau; 91120, France; (4) Max-Born-Institut for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born-Starsse 2a, Berlin; 12489, Germany

Corresponding author:Cao, Huabao(caohuabao@opt.ac.cn)

Source title:Optics Express

Abbreviated source title:Opt. Express

Volume:29

Issue:4

Issue date:February 15, 2021

Publication year:2021

Pages:5915-5922

Language:English

E-ISSN:10944087

Document type:Journal article (JA)

Publisher:OSA - The Optical Society

Abstract:We experimentally demonstrate the post-compression of radially polarized 25 fs pulses at 800 nm central wavelength in a multiple thin plate arrangement for the first time, to the best of our knowledge. Sub-7 fs pulses with 90 µJ energy were obtained after dispersion compensation, corresponding to a compression factor of more than 3.5. Preservation of radial polarization state was confirmed by polarized intensity distribution measurements. Linear projections of the radially polarized pulses were also fully characterized in the temporal domain.<br/> © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Number of references:24

Main heading:Fused silica

Uncontrolled terms:Central wavelength - Compression factor - Fused silica plates - Intensity distribution - Linear projections - Post compressions - Radial polarization - Radially polarized

Classification code:812.3 Glass

Numerical data indexing:Size 8.00e-07m, Time 2.50e-14s

DOI:10.1364/OE.416201

Funding details: Number: -, Acronym: EC, Sponsor: European Commission;Number: -, Acronym: FEDER, Sponsor: European Regional Development Fund;

Funding text:Acknowledgments. The authors thank Jérôme Faure for the loan of the four-segment waveplate and Amplitude Technologies for the support on the laser source. The ELI-ALPS project (GINOP-2.3.6-15-2015-00001) is supported by the European Union and co-financed by the European Regional Development Fund.

Database:Compendex

Open Access type(s): All Open Access, Gold, Green

Accession number:20214911288098

Title:Tera-OP/s Neuromorphic Processing with Kerr Microcombs

Authors:Tan, M. (1); Xu, X. (1, 2); Wu, J. (1); Boes, A. (3); Corcoran, B. (3); Nguyen, T. (3); Chu, S.T. (4); Little, B.E. (5); Morandotti, R. (6); Hicks, D.G. (1, 7); Mitchell, A. (3); Moss, David J. (1)

Author affiliation:(1) Optical Sciences Centre, Swinburne University of Technology, Hawthorn; VIC; 3122, Australia; (2) Dept. of Electrical and Computer Systems Engineering, Monash University, Clayton; VIC; 3800, Australia; (3) School of Engineering, RMIT University, Melbourne; VIC; 3001, Australia; (4) Department of Physics and Material Science, City University of Hong Kong, Tat Chee Avenue, Hong Kong; (5) Xi'an Institute of Optics and Precision Mechanics Precision Mechanics of CAS, Xi'an, China; (6) INRS-Ãnergie, Matriaux et Tlcommunications, 1650 Boulevard Lionel-Boulet, Varennes; Qubec; J3X 1S2, Canada; (7) Walter and Eliza Hall Institute of Medical Research, Bioinformatics Division, Parkville; Victoria; 3052, Australia

Source title:Optics InfoBase Conference Papers

Abbreviated source title:Opt. InfoBase Conf. Pap

Part number:1 of 1

Issue title:Photonics in Switching and Computing, PSC 2021

Issue date:2021

Publication year:2021

Article number:Tu5B.1

Language:English

ISBN-13:9781557528209

Document type:Conference article (CA)

Conference name:Photonics in Switching and Computing, PSC 2021

Conference date:September 27, 2021 - September 29, 2021

Conference location:Virtual, Online, United states

Conference code:174323

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">We report optical neuromorphic processors based on Kerr micro-combs that are programmable, scalable and ultra-high speed. We demonstrate a perceptron at 11.9Giga-OPS at 8 bits, or 95.2 Gbps, and a convolutional accelerator at 11TeraOPs/s.<br/></div> ©2021 The Author (s).

Number of references:7

Database:Compendex

Accession number:20214911288208

Title:Optical data transmissionwith high spectral efficiency at44Terabits/s with a soliton crystal micro-comb

Authors:Tan, M. (1); Corcoran, B. (2); Xu, X. (2); Wu, J. (1); Boes, A. (3); Nguyen, T. (3); Chu, S. (4); Little, B. (5); Morandotti, R. (6, 7); Mitchell, A. (3); Moss, D.J. (1)

Source title:Optics InfoBase Conference Papers

Abbreviated source title:Opt. InfoBase Conf. Pap

Part number:1 of 1

Issue title:Signal Processing in Photonic Communications, SPPCom 2021

Issue date:2021

Publication year:2021

Article number:SpM1F.2

Language:English

ISBN-13:9781557528209

Document type:Conference article (CA)

Conference name:Signal Processing in Photonic Communications, SPPCom 2021 - Part of OSA Advanced Photonics Congress 2021

Conference date:July 26, 2021 - July 29, 2021

Conference location:Virtual, Online, United states

Conference code:174327

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">We report data transmission over 75km in the lab and a field trial, at 44.2 Tb/s over standard optical fibre using a single integrated chip source, reaching a spectral efficiency of 10.4 bits/s/Hz.<br/></div> © 2021 OSA - The Optical Society. All rights reserved.

Number of references:21

Database:Compendex

Accession number:20214911288210

Title:Photonic convolutional accelerator and neural network in the Tera-OPs regime based on soliton crystal Kerr microcombs

Authors:Tan, M. (1); Xu, X. (2); Wu, J. (1); Boes, A. (3); Corcoran, B. (2); Nguyen, T. (3); Chu, S.T. (4); Little, B.E. (5); Morandotti, R. (6); Lowery, A.J. (2); Mitchell, A. (3); Hicks, D. (1, 7); Moss, D.J. (1)

Source title:Optics InfoBase Conference Papers

Abbreviated source title:Opt. InfoBase Conf. Pap

Part number:1 of 1

Issue title:Signal Processing in Photonic Communications, SPPCom 2021

Issue date:2021

Publication year:2021

Article number:SpM5C.1

Language:English

ISBN-13:9781557528209

Document type:Conference article (CA)

Conference name:Signal Processing in Photonic Communications, SPPCom 2021 - Part of OSA Advanced Photonics Congress 2021

Conference date:July 26, 2021 - July 29, 2021

Conference location:Virtual, Online, United states

Conference code:174327

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">We report a new approach to ONNs based on integrated Kerr micro-combs that is programmable, highly scalable and capable of reaching ultra-high speeds. We demonstrate a single neuron perceptron at 11.9 Giga-OPS at 8 bits per OP, or 95.2 Gbps. We then demonstrate a convolutional accelerator operating beyond 11 TeraOPs/s. We test the perceptron on handwritten-digit recognition and cancer-cell detection - achieving over 90% and 85% accuracy, respectively.<br/></div> © 2021 OSA - The Optical Society. All rights reserved.

Number of references:8

Database:Compendex

Accession number:20210609875212

Title:In situ lunar phase curves measured by Chang'E-4 in the von Kármán Crater, South Pole-Aitken basin (Open Access)

Authors:Jiang, Te (1); Hu, Xiaoyi (1); Zhang, Hao (1, 2); Ma, Pei (1); Li, Chunlai (3); Ren, Xin (3); Liu, Bin (3); Liu, Dawei (3); Yang, Jianfeng (4); Xue, Bin (4); Jin, Weidong (5); Zhu, Meng-Hua (6); Huang, Changning (7); Lin, Hongyu (7)

Author affiliation:(1) Planetary Science Institute, School of Earth Sciences, China University of Geosciences, Wuhan, China; (2) CAS Center for Excellence in Comparative Planetology, Hefei, China; (3) Key Laboratory of Lunar and Deep Space Exploration, National Astronomical Observatories, Chinese Academy of Sciences, Beijing, China; (4) Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China; (5) Department of Physics and Astronomy, The University of Alabama, Tuscaloosa; AL, United States; (6) State Key Laboratory of Lunar and Planetary Sciences, Macau University of Science and Technology, Taipa, China; (7) Beijing Institute of Space Mechanics and Electronics, China Academy of Space Technology, Beijing, China

Corresponding authors:Zhang, Hao(zhanghao@cug.edu.cn); Liu, Dawei(liudw@nao.cas.cn)

Source title:Astronomy and Astrophysics

Abbreviated source title:Astron. Astrophys.

Volume:646

Issue date:February 1, 2021

Publication year:2021

Article number:A2

Language:English

ISSN:00046361

E-ISSN:14320746

CODEN:AAEJAF

Document type:Journal article (JA)

Publisher:EDP Sciences

Abstract:Context. The Yutu-2 rover of the Chang'E-4 (CE-4) mission measured the lunar phase curves in the Von Kármán crater, South Pole-Aitken basin. Aims. We aim to study the photometric properties of the regolith at CE-4's landing site and compare them with those of Chang'E-3 (CE-3) in order to understand the regolith physical properties of the two landing sites. Methods. We extracted the insitu lunar phase curves measured by CE-4 with a very wide phase angle coverage (1°-144°) and performed photometric model inversions using both the Hapke model and the Lumme-Bowell model. Results. Compared with the CE-3 measurement taken in Mare Imbrium, the CE-4 phase curves show the colorimetric opposition effect and have a steeper and narrower opposition spike. The surface regolith at the CE-4 site is much darker, more porous, more forward scattering, and has a larger slope angle (Hapke model) than that of CE-3. Conclusions. The CE-4 site may have experienced more space weathering alterations than the CE-3 site, which is consistent with their different surface model ages (&sim;3.6 Ga for CE-4 and &sim;3 Ga for CE-3).<br/> © ESO 2021.

Number of references:55

Main heading:Satellites

Controlled terms:Photometry - Poles - Forward scattering - Rovers

Uncontrolled terms:Landing site - Model inversion - Opposition effects - Phase angles - Photometric properties - South Pole-Aitken basins - Space weathering - Surface modeling

Classification code:408.2 Structural Members and Shapes - 655.1 Spacecraft, General - 655.2 Satellites - 711 Electromagnetic Waves - 941.4 Optical Variables Measurements

DOI:10.1051/0004-6361/202039252

Funding details: Number: D020302, Acronym: -, Sponsor: -;Number: -, Acronym: CNSA, Sponsor: China National Space Administration;Number: 11773023,11941001,11941002,U1631124, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 0079/2018/A2,D020202, Acronym: STDF, Sponsor: Science and Technology Development Fund;

Funding text:improved the quality of the manuscript. We thank the Chang’E payload team for mission operations and China National Space Administration for providing the Chang’E data that made this study possible. This work was supported by the National Natural Science Foundation of China (11773023, 11941001, U1631124, 11941002) and the Civil Aerospace Pre-research Project (D020302). M.-H.Z. was supported by the Science and Technology Development Fund, Macau (0079/2018/A2) and the pre-research project on Civil Aerospace Technologies No. D020202 funded by China National Space Administration (CNSA). The Chang’E data used in this work were processed and produced by the Ground Research and Application System of China’s Lunar Exploration Program and can be downloaded at http://moon.bao.ac.cn/searchOrder_ dataSearchData.search.

Database:Compendex

Open Access type(s): All Open Access, Bronze, Green

Accession number:20212210426649

Title:Optical remote sensing image denoising and super-resolution reconstructing using optimized generative network in wavelet transform domain (Open Access)

Authors:Feng, Xubin (1, 2); Zhang, Wuxia (3); Su, Xiuqin (1, 2); Xu, Zhengpu (4)

Author affiliation:(1) Space Precision Measurement Laboratory, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) Joint Laboratory for Ocean Observation and Detection (Xi’an Institute of Optics and Precision Mechanics), Pilot National Laboratory for Marine Science and Technology, Qingdao; 266200, China; (3) School of Computer Science and Technology, Xi’an University of Posts and Telecommunications, Xi’an; 710121, China; (4) School of Computer Science and Technology, Xidian University, Xi’an; 710071, China

Corresponding author:Zhang, Wuxia(zhangwuxia@xupt.edu.cn)

Source title:Remote Sensing

Abbreviated source title:Remote Sens.

Volume:13

Issue:9

Issue date:May 1, 2021

Publication year:2021

Article number:1858

Language:English

E-ISSN:20724292

Document type:Journal article (JA)

Publisher:MDPI AG

Abstract:<div data-language="eng" data-ev-field="abstract">High spatial quality (HQ) optical remote sensing images are very useful for target detection, target recognition and image classification. Due to the influence of imaging equipment accuracy and atmospheric environment, HQ images are difficult to acquire, while low spatial quality (LQ) remote sensing images are very easy to acquire. Hence, denoising and super-resolution (SR) reconstruction technology are the most important solutions to improve the quality of remote sensing images very effectively, which can lower the cost as much as possible. Most existing methods usually only employ denoising or SR technology to obtain HQ images. However, due to the complex structure and the large noise of remote sensing images, the quality of the remote sensing image obtained only by denoising method or SR method cannot meet the actual needs. To address these problems, a method of reconstructing HQ remote sensing images based on Generative Adversarial Network (GAN) named "Restoration Generative Adversarial Network with ResNet and DenseNet" (RRDGAN) is proposed, which can acquire better quality images by incorporating denoising and SR into a unified framework. The generative network is implemented by fusing Residual Neural Network (ResNet) and Dense Convolutional Network (DenseNet) in order to consider denoising and SR problems at the same time. Then, total variation (TV) regularization is used to furthermore enhance the edge details, and the idea of Relativistic GAN is explored to make the whole network converge better. Our RRDGAN is implemented in wavelet transform (WT) domain, since different frequency parts could be handled separately in the wavelet domain. The experimental results on three different remote sensing datasets shows the feasibility of our proposed method in acquiring remote sensing images.<br/></div> © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Number of references:45

Main heading:Wavelet transforms

Controlled terms:Image enhancement - Optical resolving power - Image denoising - Image reconstruction - Generative adversarial networks - Optical remote sensing - Image acquisition - Image compression

Uncontrolled terms:Adversarial networks - Atmospheric environment - Convolutional networks - Optical remote sensing - Remote sensing images - Super resolution reconstruction - Total variation regularization - Wavelet-transform domain

Classification code:716.1 Information Theory and Signal Processing - 723 Computer Software, Data Handling and Applications - 723.2 Data Processing and Image Processing - 723.4 Artificial Intelligence - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 921.3 Mathematical Transformations

DOI:10.3390/rs13091858

Funding details: Number: XUPT-KLND(201902, Acronym: -, Sponsor: -;Number: 62001378, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 20JK0913, Acronym: -, Sponsor: Education Department of Shaanxi Province;

Funding text:This work was supported in part by the National Natural Science Foundation of China under Grant 62001378, in part by the Shaanxi Provincial Department of Education 2020 Scientific Research Plan under Grant 20JK0913, and in part by the Shaanxi Province Network Data Analysis and Intelligent Processing Key Laboratory Open Fund under Grant XUPT-KLND(201902).

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20213010676174

Title:Compressive parallel single-pixel imaging for efficient 3D shape measurement in the presence of strong interreflections by using a sampling Fourier strategy (Open Access)

Authors:LI, YUXI (1, 2); JIANG, HONGZHI (1, 2); ZHAO, HUIJIE (1, 2); LI, XUDONG (1, 2); WANG, YUNFAN (1); XU, YANG (3)

Author affiliation:(1) Key Laboratory of Precision Opto-Mechatronics Technology, Ministry of Education, School of Instrumentation and Optoelectronic Engineering, Beihang University, No. 37 Xueyuan Road Haidian District, Beijing; 100191, China; (2) Beihang University Qingdao Research Institute, Qingdao; 266101, China; (3) School of Information Science and Technology, Northwest University, Xi'an; 710127, China

Source title:Optics Express

Abbreviated source title:Opt. Express

Volume:29

Issue:16

Issue date:August 2, 2021

Publication year:2021

Pages:25032-25047

Language:English

E-ISSN:10944087

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">We present a compressive parallel single-pixel imaging (cPSI) method, which applies compressive sensing in the context of PSI, to achieve highly efficient light transport coefficients capture and 3D reconstruction in the presence of strong interreflections. A characteristic-based sampling strategy is introduced that has sampling frequencies with high energy and high probability. The characteristic-based sampling strategy is compared with various state-of-the-art sampling strategies, including the square, circular, uniform random, and distance-based sampling strategies. Experimental results demonstrate that the characteristic-based sampling strategy exhibits the best performance, and cPSI can obtain highly accurate 3D shape data in the presence of strong interreflections with high efficiency.<br/></div> © 2021 Optical Society of America.

Number of references:32

Main heading:Pixels

Controlled terms:Reflection

Uncontrolled terms:3-d shape measurement - 3D reconstruction - Compressive sensing - High probability - Interreflections - Sampling frequencies - Sampling strategies - State of the art

DOI:10.1364/OE.433118

Funding details: Number: 18-1-2-22-zhc, Acronym: -, Sponsor: -;Number: 61735003,61875007, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2020YFB2010701, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Funding text:Funding. National Natural Science Foundation of China (61735003, 61875007); National Key Research and Development Program of China (2020YFB2010701); Leading Talents Program for Enterpriser and Innovator of Qingdao (18-1-2-22-zhc).

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20213710879633

Title:Paraxial 3D shape measurement using parallel single-pixel imaging (Open Access)

Authors:Wang, Yunfan (1); Zhao, Huijie (1); Jiang, Hongzhi (1); Li, Xudong (1, 2); Li, Yuxi (1, 2); Xu, Yang (3)

Author affiliation:(1) Key Laboratory of Precision Opto-mechatronics Technology, Ministry of Education, School of Instrumentation and Optoelectronic Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing; 100191, China; (2) Beihang University Qingdao Research Institute, Qingdao; 266101, China; (3) School of Information Science and Technology, Northwest University, Xi'an; 710127, China

Source title:Optics Express

Abbreviated source title:Opt. Express

Volume:29

Issue:19

Issue date:September 13, 2021

Publication year:2021

Pages:30543-30557

Language:English

E-ISSN:10944087

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">Three-dimensional (3D) shape measurement with fringe projection technique and vertical scanning setup can alleviate the problem of shadow and occlusion. However, the shape-from-defocus based method suffers from limited sensitivity and low signal-to-noise ratio (SNR), whereas the projection-triangulation based is sensitive to the zero-phase detection. In this paper, we propose paraxial 3D shape measurement using parallel single-pixel imaging (PSI). The depth is encoded in the radial distance to the projector optical center, which is determined by the projection of light transport coefficients (LTCs). The third-order polynomial fitting is used for depth mapping and calibration. Experiments on 5 objects with different materials and textures are conducted, and standards are measured to test the accuracy. The results verified that the proposed method can achieve robust, dense reconstruction with depth accuracy at 20 μm while the root-mean-square error (RMSE) of plane fitting up to 43 μm.<br/></div> © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.

Number of references:23

Main heading:Textures

Controlled terms:Light transmission - Signal to noise ratio - Visibility - Mean square error - Pixels

Uncontrolled terms:3-d shape measurement - Fringe projection techniques - Limited sensitivity - Low signal-to-noise ratio - Root mean square errors - Shape-from-defocus - Three dimensional (3 D) shape measurement - Triangulation-based

Classification code:716.1 Information Theory and Signal Processing - 741.1 Light/Optics - 741.2 Vision - 922.2 Mathematical Statistics

Numerical data indexing:Size 2.00e-05m, Size 4.30e-05m

DOI:10.1364/OE.435470

Funding details: Number: 61735003,61875007, Acronym: NNSFC, Sponsor: National Natural Science Foundation of China;Number: 2020YFB2010701, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Funding text:Funding. National Key Research and Development Program of China (2020YFB2010701); National Natural Science Foundation of China (61735003, 61875007).

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20213210724378

Title:Separation of interreflections based on parallel single-pixel imaging (Open Access)

Authors:JIANG, HONGZHI (1, 2); YAN, YONGJING (1); LI, XUDONG (1, 2); ZHAO, HUIJIE (1, 2); LI, YUXI (1, 2); XU, YANG (3)

Source title:Optics Express

Abbreviated source title:Opt. Express

Volume:29

Issue:16

Issue date:August 2, 2021

Publication year:2021

Pages:26150-26164

Language:English

E-ISSN:10944087

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">Interreflections introduced by points in a scene are not only illuminated by the light source used but also by other points in the scene. Interreflections cause inaccuracy and the failure of 3D recovery and optical measurements. In this research, a novel method for separating interreflections through parallel single-pixel imaging (PSI) is proposed, which can decompose interreflections into 1st bounce light, 2nd bounce light, and a higher order light component. PSI is used in obtaining the light transport coefficients of each camera pixel, and light transport coefficients are used in decomposing the intensity distribution of a projector and the component of interreflections. Results show that the proposed method can separate the interreflections of a real static scene in a concave surface.<br/></div> © 2021 Optical Society of America.

Number of references:29

Main heading:Light sources

Controlled terms:Optical data processing - Reflection - Light transmission - Pixels - Separation

Uncontrolled terms:3-D recovery - Concave surface - Higher-order - Intensity distribution - Interreflections - Light transport - Optical measurement - Single pixel

Classification code:723.2 Data Processing and Image Processing - 741.1 Light/Optics - 802.3 Chemical Operations

DOI:10.1364/OE.424777

Funding details: Number: 18-1-2-22-zhc, Acronym: -, Sponsor: -;Number: 61735003,61875007, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2018A030313797, Acronym: -, Sponsor: Natural Science Foundation of Guangdong Province;Number: 2020YFB2010701, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Funding text:Funding. National Key Research and Development Program of China (2020YFB2010701); National Natural Science Foundation of China (61735003, 61875007); Leading Talents Program for Enterpriser and Innovator of Qingdao (18-1-2-22-zhc); Natural Science Foundation of Guangdong Province (2018A030313797).

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20205209683434

Title:Single-Photon Counting Laser Ranging with Optical Frequency Combs

Authors:Ren, Xinyi (1); Xu, Bo (2); Fei, Qilai (3); Liang, Yan (2); Ge, Jinman (4); Wang, Xiaoyue (1); Huang, Kun (1, 3); Yan, Ming (1, 3); Zeng, Heping (1, 3)

Author affiliation:(1) State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, China; (2) Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology, Shanghai, China; (3) Chongqing Institute, East China Normal University, Chongqing, China; (4) National Key Laboratory of Science and Technology on Space Microwave, CAST, Xi'an, China

Corresponding authors:Yan, Ming(myan@lps.ecnu.edu.cn); Liang, Yan(yanliang@usst.edu.cn)

Source title:IEEE Photonics Technology Letters

Abbreviated source title:IEEE Photonics Technol Lett

Volume:33

Issue:1

Issue date:January 1, 2021

Publication year:2021

Pages:27-30

Article number:9281096

Language:English

ISSN:10411135

E-ISSN:19410174

CODEN:IPTLEL

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:Time-of-flight single-photon counting laser ranging offers an important tool for remote sensing and imaging. However, limited by the temporal properties of a single-photon detection and counting system, it encounters a challenge for high-resolution and high-precision distance metrology. Here, we incorporated dual-comb based laser ranging, an enabling technique for rapid distance measurements with high precision and large range ambiguity, with time-correlated single-photon counting (TCSPC) technology and demonstrated its feasibility for precise laser ranging under a photon-starved condition. Based on interferometric measurements of two asynchronous 2.8-pW, 25-GHz electro-optic laser combs with TCSPC, micrometer-level ranging precision was achieved for consistent distance measurements (a stand-off distance of 15.6 m) over several days. New opportunities might open up for high-resolution and high-precision single-photon counting laser ranging.<br/> © 1989-2012 IEEE.

Number of references:26

Main heading:Natural frequencies

Controlled terms:Particle beams - Optical materials - Optical remote sensing - Photons

Uncontrolled terms:Distance metrology - Enabling techniques - Interferometric measurement - Optical frequency combs - Single photon counting - Single photon detection - Stand-off distance (SoD) - Time-correlated single-photon counting

Classification code:741.3 Optical Devices and Systems - 931.3 Atomic and Molecular Physics - 932.1 High Energy Physics

Numerical data indexing:Frequency 2.50e+10Hz, Power 2.80e-12W, Size 1.56e+01m

DOI:10.1109/LPT.2020.3042499

Funding details: Number: 18JC1412000, Acronym: -, Sponsor: -;Number: 11804100,11904283, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2019SHZDZX01, Acronym: STCSM, Sponsor: Science and Technology Commission of Shanghai Municipality;Number: 6142411196316, Acronym: -, Sponsor: National Key Laboratory Foundation of China;

Funding text:This work was supported in part by the Natural National Science Foundation of China (NSFC) under Grant 11804100 and Grant 11904283, in part by the National Key Laboratory Foundation under Contract 6142411196316, in part by the Shanghai Municipal Science and Technology Major Project under Grant 2019SHZDZX01, and in part by the Science and Technology Innovation Program of Basic Science Foundation of Shanghai under Grant 18JC1412000.Manuscript received October 12, 2020; revised November 4, 2020; accepted November 29, 2020. Date of publication December 4, 2020; date of current version December 14, 2020. This work was supported in part by the Natural National Science Foundation of China (NSFC) under Grant 11804100 and Grant 11904283, in part by the National Key Laboratory Foundation under Contract 6142411196316, in part by the Shanghai Municipal Science and Technology Major Project under Grant 2019SHZDZX01, and in part by the Science and Technology Innovation Program of Basic Science Foundation of Shanghai under Grant 18JC1412000. (Corresponding authors: Yan Liang; Ming Yan.) Xinyi Ren and Xiaoyue Wang are with the State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China (e-mail: 52190920021@stu.ecnu.edu.cn; 52170920006@stu.ecnu.edu.cn).

Database:Compendex

Accession number:20213110716142

Title:In situ SERS detection of quinolone antibiotic residues in a water environment based on optofluidic in-fiber integrated Ag nanoparticles

Authors:Teng, Pingping (1); Gao, Danheng (1); Yang, Xinghua (1); Luo, Meng (1); Kong, Depeng (2); Gao, Shuai (1); Liu, Zhihai (1); Li, Zhanao (1); Wen, Xingyue (1); Yuan, Libo (1, 3); Li, Kang (4); Bowkett, Mark (4); Copner, Nigel (4)

Author affiliation:(1) Key Lab of In-Fiber Integrated Optics, College of Science, Harbin Engineering University, Harbin; 150001, China; (2) State Key Lab of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (3) Photonics Research Center, Guilin University of Electronics Technology, Guilin; 541004, China; (4) Wireless & Optoelectronics Research & Innovation Centre, Faculty of Computing, Engineering & Science, University of South Wales, Wales; CF37 1DL, United Kingdom

Corresponding author:Yang, Xinghua(yangxh@hrbeu.edu.cn)

Source title:Applied Optics

Abbreviated source title:Appl. Opt.

Volume:60

Issue:22

Issue date:August 1, 2021

Publication year:2021

Pages:6659-6664

Language:English

ISSN:1559128X

E-ISSN:21553165

CODEN:APOPAI

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">In this paper, we present a microstructured optofluidic in-fiber Raman sensor for the detection of quinolone antibiotic residue in a water environment based on Ag surface-enhanced Raman scattering (SERS) substrate grown on the surface of the suspended core of micro-hollow optical fiber (MHF). Here, MHF has a special structure with a suspended core and a microchannel inside, which can become a natural in-fiber optofluidic device. Meanwhile, the self-assembled Ag SERS substrate can be grown on the suspended core’s surface through chemical bonds, forming a microstructured optofluidic device with a Raman enhancement effect. Therefore, it can effectively detect the Raman signal of unlabeled trace quinolone antibiotic residue (ciprofloxacin and norfloxacin) inside the optical fiber. The results show that the ciprofloxacin and norfloxacin detection limits (LOD) are 10<sup>−10</sup> M and 10<sup>−11</sup> M, respectively. Compared with the maximum residue limit (3.01 × 10<sup>−7</sup> mol/L) stipulated by the European Union, the results are much lower, and an ideal quantitative relationship can be obtained within the detection range. Significantly, this study provides an in-fiber microstructured optofluidic Raman sensor for the label-free detection of quinolone antibiotic residue, which will have good development prospects in the field of antibiotic water pollution environmental detection.<br/></div> © 2021 Optical Society of America

Number of references:22

Main heading:Water pollution

Controlled terms:Silver nanoparticles - Microstructure - Raman scattering - Surface scattering - Antibiotics - Bond strength (chemical) - Raman spectroscopy - Optical fibers - Substrates

Uncontrolled terms:Development prospects - Environmental detection - Label-free detection - Maximum residue limits - Optofluidic devices - Quinolone antibiotics - Surface enhanced Raman Scattering (SERS) - Water environments

Classification code:453 Water Pollution - 461.6 Medicine and Pharmacology - 741.1 Light/Optics - 741.1.2 Fiber Optics - 761 Nanotechnology - 801.4 Physical Chemistry - 931 Classical Physics; Quantum Theory; Relativity - 951 Materials Science

DOI:10.1364/AO.426611

Database:Compendex

Accession number:20211910311241

Title:High Contrast Imaging through Infrared Chalcogenide Imaging Fiber Bundle Illuminated by Quantum Cascade Laser

Title of translation:基于量子级联激光器照明的高对比度红外内窥成像

Authors:Yu, Taoying (1); Yuan, Yifang (1, 2); Li, Yunxuan (3); Han, Dong (1); Zhu, Jiaying (1, 4)

Author affiliation:(1) Innovation Laboratory of Terahertz Biophysics, National Innovation Institute of Defense Technology, Beijing; 100071, China; (2) School of Physics and Optoelectronic Engineering, Xidian University, Xi'an; 710071, China; (3) China Academy of Launch Vehicle Technology, Beijing; 100076, China; (4) School of Precision Instrument and Optoelectronic Engineering, Tianjin University, Tianjin; 300072, China

Corresponding author:Yu, Taoying(ytyccc@163.com)

Source title:Guangzi Xuebao/Acta Photonica Sinica

Abbreviated source title:Guangzi Xuebao

Volume:50

Issue:3

Issue date:March 25, 2021

Publication year:2021

Article number:0306001

Language:Chinese

ISSN:10044213

CODEN:GUXUED

Document type:Journal article (JA)

Publisher:Chinese Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">A fiber bundle made of 12×9 individual Ge-As-Te-Se fibers with a core diameter of 20 μm has been tested for optical properties and used to carry out the imaging experiment. A 5~11 μm continuous tunable quantum cascade laser has been used to test the bundle's attenuation property with a cut-back method. The attenuation of bundle is nearly 1 dB/cm in the spectral region. A compact distal objective lens with length of 13.6 mm and diameter of 6 mm based on telecentric system has been designed and fabricated. The MTF of the lens showed the ablitity to transmit the image with resolution of 25 μm. A infrared image with 2 mm×2 mm and 100 μm resolution with quantum cascade lasers illumination, which has high power spectrum density and narrow linewidth, has been captured. A comparison experiment about the environmental temperature has been conducted illuminated by quantum cascade laser and incoherent black body, it proved that the quantum cascade laser illumination could help build a high SNR imaging under a high environmental temperature even above human's temperature. It would be meaningful for the next infrared endoscopy experiment in vivo way.<br/></div> © 2021, Science Press. All right reserved.

Number of references:21

Main heading:Quantum cascade lasers

Controlled terms:Optical properties - Tellurium compounds - Germanium compounds - Infrared imaging - Signal to noise ratio - Selenium compounds

Uncontrolled terms:Attenuation properties - Cut-back method - Environmental temperature - High contrast imaging - Imaging experiments - Imaging fiber bundle - Narrow-line width - Telecentric system

Classification code:716.1 Information Theory and Signal Processing - 741.1 Light/Optics - 744.1 Lasers, General - 746 Imaging Techniques

Numerical data indexing:Size 1.00e-04m, Size 1.36e-02m, Size 2.00e-05m, Size 2.50e-05m, Size 5.00e-06m to 1.10e-05m, Size 6.00e-03m

DOI:10.3788/gzxb20215003.0306001

Funding details: Number: 11622542, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:item：National Natural Science Foundation of China（No. 11622542）

Database:Compendex

Accession number:20213110702575

Title:Two-step randomized design of multi-rings metallic mesh for ultra-uniform diffraction distribution

Authors:Lu, Zhengang (1, 2, 3); Zhang, Yilei (1, 2); Lu, Xi (1, 2); Wang, Heyan (1, 2); Tan, Jiubin (1, 2)

Author affiliation:(1) Center of Ultra-precision Optoelectronic Instrument engineering, Harbin Institute of Technology, Harbin; 150080, China; (2) Key Lab of Ultra-precision Intelligent Instrumentation (Harbin Institute of Technology), Ministry of Industry and Information Technology, Harbin; 150080, China; (3) State Key Laboratory of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, Xi'an; 710024, China

Corresponding author:Lu, Zhengang(luzhengang@hit.edu.cn)

Source title:Optics and Laser Technology

Abbreviated source title:Opt Laser Technol

Volume:144

Issue date:December 2021

Publication year:2021

Article number:107396

Language:English

ISSN:00303992

CODEN:OLTCAS

Document type:Journal article (JA)

Publisher:Elsevier Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">We propose a random multi-rings metallic mesh (RMR-MM) with the two-step randomized design process. By randomly shrinking the radii and changing the center positions of the basic rings, adding and interrupting the external common tangent rings, filling random sub-rings and supplementary rings, the superposition probability of diffraction spots generated by the multi-rings is reduced to a ultra-low level and thus ultra-uniform diffraction pattern is achieved. Experiment shows that the maximum high-order diffraction energy of RMR-MM experience an 85.96% drop from that of traditional triangle-distributed basic ring mesh, while the average normalized visible transmittance as high as 95.76% in 400–700 nm is achieved. In addition, the 200-nm-thick aluminum RMR-MM exhibits an electromagnetic shielding effectiveness of over 17.5 dB in the Ku-band. These excellent properties indicate RMR-MM is favorable in transparent electrodes as well as electromagnetic interference shielding application for optically transparent devices.<br/></div> © 2021 Elsevier Ltd

Number of references:34

Main heading:Diffraction

Controlled terms:Electromagnetic pulse - Electromagnetic wave interference - Mesh generation - Signal interference - Transparent electrodes - Design - Electromagnetic shielding

Uncontrolled terms:Design-process - Diffraction spots - Electromagnetic interference shielding - Higher-order diffraction - Metallic mesh - MultiRing - Optical transparency - Randomized design - Transparent conductors - Uniform diffraction

Classification code:701 Electricity and Magnetism - 711 Electromagnetic Waves - 716.1 Information Theory and Signal Processing - 723.5 Computer Applications - 921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory

Numerical data indexing:Decibel 1.75E+01dB, Percentage 8.596E+01%, Percentage 9.576E+01%, Size 2.00E-07m, Size 7.00E-07m

DOI:10.1016/j.optlastec.2021.107396

Funding details: Number: SKLIPR1809, Acronym: -, Sponsor: -;Number: 61975046, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;

Funding text:This work was supported by National Natural Science Foundation of China (NSFC) ( 61975046 ), and State Key Laboratory of Intense Pulsed Radiation Simulation and Effect ( SKLIPR1809 ).We also wish to express our sincere gratitude to CST Computer Simulation Technology GmbH, Germany, for providing a free package of CST Studio Suite at the CST Training Center (Northeast China Region) in our university. This work was supported by National Natural Science Foundation of China (NSFC) (61975046), and State Key Laboratory of Intense Pulsed Radiation Simulation and Effect (SKLIPR1809).

Database:Compendex

Accession number:20212110380609

Title:Photonic convolutional accelerator and neural network in the Tera-OPs regime based on Kerr microcombs (Open Access)

Authors:Xu, Xingyuan (1); Tan, Mengxi (1); Corcoran, Bill (2); Wu, Jiayang (1); Boes, Andreas (3); Nguyen, Thach G. (3); Chu, Sai T. (4); Little, Brent E. (5); Hicks, Damien G. (1, 6); Morandotti, Roberto (7, 8); Mitchell, Arnan (3); Moss, David J. (1)

Author affiliation:(1) Optical Sciences Centre, Swinburne University of Technology, Hawthorn; VIC; 3122, Australia; (2) Department of Electrical and Computer Systems Engineering, Monash University, Clayton; VIC; 3800, Australia; (3) School of Engineering, RMIT University, Melbourne; VIC; 3001, Australia; (4) Department of Physics, City University of Hong Kong, Tat Chee Avenue, Hong Kong, Hong Kong; (5) Xi'An Institute of Optics and Precision Mechanics Precision Mechanics of CAS, Xi'an, China; (6) Bioinformatics Division, Walter and Eliza Hall Institute of Medical Research, Parkville; VIC; 3052, Australia; (7) INRS-Énergie, Matériaux et Télécommunications, 1650 Boulevard Lionel-Boulet, Varennes; QC; J3X1S2, Canada; (8) Inst. of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu; 610054, China

Corresponding author:Moss, David J.

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11689

Part number:1 of 1

Issue title:Integrated Optics: Devices, Materials, and Technologies XXV

Issue date:2021

Publication year:2021

Article number:1168915

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510642133

Document type:Conference article (CA)

Conference name:Integrated Optics: Devices, Materials, and Technologies XXV 2021

Conference date:March 6, 2021 - March 11, 2021

Conference location:Virtual, Online, United states

Conference code:168803

Sponsor:Society of Photo-Optical Instrumentation Engineers (SPIE)

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">We report a photonic RF arbitrary waveform generator and phase encoded signal generator using a soliton crystal micro-comb source with a free spectral range (FSR) of 48.9 GHz, that provides 80 wavelengths. We achieve arbitrary waveform shapes including square waveforms with a tunable duty ratio from 10% to 90%, sawtooth waveforms with a slope ratio of 0.2 to 1, and a symmetric concave quadratic chirp waveform with an instantaneous frequency of sub GHz. The phase encoded signal generator achieves a high pulse compression ratio of 30 and phase encoding rates from 2 to 6 Gb/s This work verifies the effectiveness of using microcombs for high-performance, broad bandwidth, nearly user-defined RF waveform generation.<br/></div> © 2021 SPIE.

Number of references:95

Main heading:Signal generators

Controlled terms:Bandwidth compression - Convolution

Uncontrolled terms:Arbitrary waveform - Arbitrary waveform generator - Broad bandwidths - Chirp waveforms - Free spectral range - Instantaneous frequency - Sawtooth waveform - Waveform generation

Classification code:716.1 Information Theory and Signal Processing

Numerical data indexing:Bit_Rate 2.00e+09bit/s to 6.00e+09bit/s, Frequency 4.89e+10Hz, Percentage 1.00e+01% to 9.00e+01%

DOI:10.1117/12.2584017

Database:Compendex

Open Access type(s): All Open Access, Green

Accession number:20212110381609

Title:Single perceptron at 12 GigaOPs based on a microcomb for versatile, high-speed scalable, optical neural networks (Open Access)

Authors:Tan, M. (1); Xu, X. (2); Wu, J. (1); Boes, A. (3); Corcoran, B. (2); Nguyen, T.G. (3); Chu, S.T. (4); Little, B.E. (5); Morandotti, R. (6, 7); Mitchell, A. (3); Hicks, D.G. (1, 8); Moss, D.J. (1)

Author affiliation:(1) Optical Sciences Centre, Swinburne University of Technology, Hawthorn; VIC; 3122, Australia; (2) Dept. of Electrical and Computer Systems Engineering, Monash University, Clayton; VIC; 3800, Australia; (3) School of Engineering, RMIT University, Melbourne; VIC; 3001, Australia; (4) Department of Physics and Material Science, City University of Hong Kong, Tat Chee Avenue, Hong Kong, Hong Kong; (5) Xi'An Institute of Optics and Precision Mechanics Precision Mechanics, CAS, Xi'an, China; (6) INRS-Énergie, Matériaux et Télécommunications, 1650 Boulevard Lionel-Boulet, Varennes; QC; J3X1S2, Canada; (7) Adjunct, Frontier Sciences, University of Electronic Science and Technology of China, Chengdu; 610054, China; (8) Bioinformatics Division, Walter and Eliza Hall Institute of Medical Research, Parkville; VIC; 3052, Australia

Source title:Proceedings of SPIE - The International Society for Optical Engineering

Abbreviated source title:Proc SPIE Int Soc Opt Eng

Volume:11690

Part number:1 of 1

Issue title:Smart Photonic and Optoelectronic Integrated Circuits XXIII

Issue date:2021

Publication year:2021

Article number:116900M

Language:English

ISSN:0277786X

E-ISSN:1996756X

CODEN:PSISDG

ISBN-13:9781510642157

Document type:Conference article (CA)

Conference name:Smart Photonic and Optoelectronic Integrated Circuits XXIII 2021

Conference date:March 6, 2021 - March 11, 2021

Conference location:Virtual, Online, United states

Conference code:168804

Sponsor:The Society of Photo-Optical Instrumentation Engineers (SPIE)

Publisher:SPIE

Abstract:<div data-language="eng" data-ev-field="abstract">Optical artificial neural networks (ONNs) have significant potential for ultra-high computing speed and energy efficiency. We report a novel approach to ONNs that uses integrated Kerr optical micro-combs. This approach is programmable and scalable and is capable of reaching ultra-high speeds. We demonstrate the basic building block ONNs- A single neuron perceptron-by mapping synapses onto 49 wavelengths to achieve an operating speed of 11.9 x 109 operations per second, or Giga-OPS, at 8 bits per operation, which equates to 95.2 gigabits/s (Gbps). We test the perceptron on handwritten-digit recognition and cancer-cell detection- A chieving over 90% and 85% accuracy, respectively. By scaling the perceptron to a deep learning network using off-the-shelf telecom technology we can achieve high throughput operation for matrix multiplication for real-time massive data processing.<br/></div> © 2021 SPIE.

Number of references:103

Main heading:Data handling

Controlled terms:Deep learning - Microwave photonics - Character recognition - Convolutional neural networks - Microwave resonators - Energy efficiency

Uncontrolled terms:Basic building block - Cancer cell detection - Handwritten digit recognition - High-throughput operation - Learning network - MAtrix multiplication - Optical neural networks - Ultra high speed

Classification code:461.4 Ergonomics and Human Factors Engineering - 525.2 Energy Conservation - 714 Electronic Components and Tubes - 723.2 Data Processing and Image Processing - 741.1 Light/Optics

Numerical data indexing:Percentage 8.50e+01%, Percentage 9.00e+01%

DOI:10.1117/12.2584011

Database:Compendex

Open Access type(s): All Open Access, Green

Accession number:20214911282279

Title:Optical neuromorphic processing based on Kerr microcombs

Authors:Xu, X. (1, 2); Tan, M. (1); Wu, J. (1); Boes, A. (3); Corcoran, B. (2); Nguyen, T. (3); Chu, S.T. (4); Little, B.E. (5); Morandotti, R. (6, 7); Mitchell, A. (3); Hicks, D. (1, 8); Moss, D.J. (1)

Author affiliation:(1) Optical Sciences Centre, Swinburne University of Technology, Hawthorn; VIC; 3122, Australia; (2) Dept. of Electrical and Computer Systems Engineering, Monash University, Clayton; VIC; 3800, Australia; (3) School of Engineering, RMIT University, Melbourne; VIC; 3001, Australia; (4) Department of Physics and Material Science, City University of Hong Kong, Tat Chee Avenue, Hong Kong, Hong Kong; (5) Xi'An Institute of Optics and Precision Mechanics Precision Mechanics of CAS, Xi'an, China; (6) INRS-Énergie, Matériaux et Télécommunications, 1650 Boulevard Lionel-Boulet, Varennes; QC; J3X 1S2, Canada; (7) Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology, Chengdu, China; (8) Bioinformatics Division, Walter and Eliza Hall Institute of Medical Research, Parkville; VIC; 3052, Australia

Source title:2021 Conference on Lasers and Electro-Optics, CLEO 2021 - Proceedings

Abbreviated source title:Conf. Lasers Electro-Opt., CLEO - Proc.

Part number:1 of 1

Issue title:2021 Conference on Lasers and Electro-Optics, CLEO 2021 - Proceedings

Issue date:May 2021

Publication year:2021

Language:English

ISBN-13:9781943580910

Document type:Conference article (CA)

Conference name:2021 Conference on Lasers and Electro-Optics, CLEO 2021

Conference date:May 9, 2021 - May 14, 2021

Conference location:Virtual, Online, United states

Conference code:173264

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:<div data-language="eng" data-ev-field="abstract">We report a new approach to ONNs based on integrated Kerr micro-combs that is programmable, highly scalable and capable of reaching ultra-high speeds. We demonstrate a single neuron perceptron at 11.9 Giga-OPS at 8 bits per OP, or 95.2 Gbps. We then demonstrate a convolutional accelerator operating beyond 11 TeraOPs/s. We test the perceptron on handwritten-digit recognition and cancer-cell detection-achieving over 90% and 85% accuracy, respectively.<br/></div> © 2021 OSA.

Number of references:7

Main heading:Optical fibers

Controlled terms:Optical fiber communication - Character recognition

Uncontrolled terms:Cancer cell detection - Gigas - Handwritten digit recognition - Microcombs - Neuromorphic - New approaches - Optical- - Single neuron - Ultra high speed

Classification code:717.1 Optical Communication Systems - 741.1.2 Fiber Optics

Numerical data indexing:Bit rate 9.52E+10bit/s, Percentage 8.50E+01%, Percentage 9.00E+01%

Database:Compendex

Accession number:20211310143987

Title:Calibration of geometrical aberration in transmitted wavefront testing of refractive optics with deflectometry

Authors:Wang, Daodang (1, 2, 3); Yin, Yamei (4); Dou, Jinchao (2); Kong, Ming (2); Xu, Xinke (2); Lei, Lihua (5); Liang, Rongguang (6)

Author affiliation:(1) College of Energy Engineering, Zhejiang University, Hangzhou; 310027, China; (2) College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou; 310018, China; (3) Wenzhou Research Institute of Zhejiang University, Wenzhou; 325006, China; (4) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (5) Shanghai Key Lab. of Online Test and Control Technology, Shanghai Institute of Measurement and Testing Technology, Shanghai; 201203, China; (6) James C. Wyant College of Optical Sciences, University of Arizona, Tucson; AZ; 85721, United States

Corresponding author:Wang, Daodang(wangdaodang@sina.com)

Source title:Applied Optics

Abbreviated source title:Appl. Opt.

Volume:60

Issue:7

Issue date:March 1, 2021

Publication year:2021

Pages:1973-1981

Language:English

ISSN:1559128X

E-ISSN:21553165

CODEN:APOPAI

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:Deflectometry, with its noticeable advantages such as simple structure, large dynamic range, and high accuracy comparable to interferometry, has been one of the powerful metrological techniques for optical surfaces in recent years. In the "null" deflectometric transmitted wavefront testing of refractive optics, ray tracing of the test system model is required, in which both the miscalibration of system geometrical parameters and optical tolerances on tested optics could introduce significant geometrical aberrations in the testing results. In this paper, the geometrical aberration introduced by a system modeling error in the transmitted wavefront testing is discussed. Besides, a calibration method based on polynomial optimization of geometrical aberration is presented for the geometrical aberration calibration. Both simulation and experiment have been performed to validate the feasibility of the proposed calibration method. The proposed method can calibrate the optical tolerances on tested optics effectively, and it is feasible even with a large geometric error, providing a viable way to address the uncertainty in system modeling in transmitted wavefront testing of freeform refractive optics with large dynamic range.<br/> © 2021 Optical Society of America

Number of references:35

Main heading:Aberrations

Controlled terms:Geometry - Calibration - Uncertainty analysis - Fits and tolerances - Wavefronts - Wave transmission

Uncontrolled terms:Calibration method - Geometric errors - Optical surfaces - Optical tolerances - Polynomial optimization - Refractive optics - Simple structures - Transmitted wavefronts

Classification code:921 Mathematics - 922.1 Probability Theory

DOI:10.1364/AO.415715

Funding details: Number: 51775528, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: LY17E050016,LY19F050008,LY21E050014, Acronym: ZJNSF, Sponsor: Natural Science Foundation of Zhejiang Province;

Funding text:Funding. National Natural Science Foundation of China (51775528); Natural Science Foundation of Zhejiang Province (LY17E050016, LY19F050008, LY21E050014).

Database:Compendex

Accession number:20214811250748

Title:Optical neuromorphic processing based on Kerr microcombs

Author affiliation:(1) Optical Sciences Centre, Swinburne University of Technology, Hawthorn; VIC; 3122, Australia; (2) Dept. of Electrical and Computer Systems Engineering, Monash University, Clayton; VIC; 3800, Australia; (3) School of Engineering, RMIT University, Melbourne; VIC; 3001, Australia; (4) Department of Physics and Material Science, City University of Hong Kong, Tat Chee Avenue, Hong Kong; (5) Xi'an Institute of Optics and Precision Mechanics Precision Mechanics of CAS, Xi'an, China; (6) INRS-Énergie, Matériaux et Télécommunications, 1650 Boulevard Lionel-Boulet, Varennes; QC; J3X 1S2, Canada; (7) Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology, Chengdu, China; (8) Bioinformatics Division, Walter and Eliza Hall Institute of Medical Research, Parkville; VIC; 3052, Australia

Source title:Optics InfoBase Conference Papers

Abbreviated source title:Opt. InfoBase Conf. Pap

Part number:1 of 1

Issue title:CLEO: Science and Innovations, CLEO:S and I 2021

Issue date:2021

Publication year:2021

Article number:AW2E.4

Language:English

ISBN-13:9781557528209

Document type:Conference article (CA)

Conference name:CLEO: Science and Innovations, CLEO:S and I 2021 - Part of Conference on Lasers and Electro-Optics, CLEO 2021

Conference date:May 9, 2021 - May 14, 2021

Conference location:Virtual, Online, United states

Conference code:174080

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">We report a new approach to ONNs based on integrated Kerr micro-combs that is programmable, highly scalable and capable of reaching ultra-high speeds. We demonstrate a single neuron perceptron at 11.9 Giga-OPS at 8 bits per OP, or 95.2 Gbps. We then demonstrate a convolutional accelerator operating beyond 11 TeraOPs/s. We test the perceptron on handwritten-digit recognition and cancer-cell detection - achieving over 90% and 85% accuracy, respectively.<br/></div> © OSA 2021, © 2021 The Author(s)

Number of references:7

Main heading:Optical fibers

Controlled terms:Character recognition - Optical fiber communication

Uncontrolled terms:Cancer cell detection - Gigas - Handwritten digit recognition - Microcombs - Neuromorphic - New approaches - Optical- - Single neuron - Ultra high speed

Classification code:717.1 Optical Communication Systems - 741.1.2 Fiber Optics

Numerical data indexing:Percentage 9.00E+01%, Bit rate 9.52E+10bit/s, Percentage 8.50E+01%

Database:Compendex

Accession number:20214110997778

Title:Monitoring cyanobacteria bloom in dianchi lake based on ground-based multispectral remote-sensing imaging: Preliminary results (Open Access)

Authors:Zhao, Huan (1); Li, Junsheng (2, 3); Yan, Xiang (4); Fang, Shengzhong (4); Du, Yichen (2, 3); Xue, Bin (5); Yu, Kai (2); Wang, Chen (1)

Author affiliation:(1) Satellite Application Center for Ecology and Environment, Ministry of Ecology and Environment of the People’s Republic of China, Beijing; 100094, China; (2) Key Laboratory of Digital Earth Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing; 100094, China; (3) School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing; 100049, China; (4) The Ecological and Environmental Monitoring Station of DEEY in Kunming, Kunming; 650000, China; (5) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China

Corresponding author:Wang, Chen(wangchen@e-mail.secmep.cn)

Source title:Remote Sensing

Abbreviated source title:Remote Sens.

Volume:13

Issue:19

Issue date:October-1 2021

Publication year:2021

Article number:3970

Language:English

E-ISSN:20724292

Document type:Journal article (JA)

Publisher:MDPI

Abstract:<div data-language="eng" data-ev-field="abstract">Some lakes in China have undergone serious eutrophication, with cyanobacterial blooms occurring frequently. Dynamic monitoring of cyanobacterial blooms is important. At present, the traditional lake-survey-based cyanobacterial bloom monitoring is spatiotemporally limited and requires considerable human and material resources. Although satellite remote sensing can rapidly monitor large-scale cyanobacterial blooms, clouds and other factors often mean that effective images cannot be obtained. It is also difficult to use this method to dynamically monitor and manage aquatic environments and provide early warnings of cyanobacterial blooms in lakes and reservoirs. In contrast, ground-based remote sensing can operate under cloud cover and thus act as a new technical method to dynamically monitor cyanobacterial blooms. In this study, ground-based remote-sensing technology was applied to multitemporal, multidirectional, and multiscene monitoring of cyanobacterial blooms in Dianchi Lake via an area array multispectral camera mounted on a rotatable cloud platform at a fixed station. Results indicate that ground-based imaging remote sensing can accurately reflect the spatiotemporal distribution characteristics of cyanobacterial blooms and provide timely and accurate data for salvage treatment and early warnings. Thus, ground-based multispectral remote-sensing data can operationalize the dynamic monitoring of cyanobacterial blooms. The methods and results from this study can provide references for monitoring such blooms in other lakes.<br/></div> © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Number of references:23

Main heading:Lakes

Controlled terms:Reservoirs (water) - Fixed platforms - Remote sensing - Eutrophication - Monitoring

Uncontrolled terms:Cyanobacteria blooms - Cyanobacterial blooms - Dianchi lakes - Dynamic monitoring - Early warning - Ground based - Ground-based remote sensing - Multispectral remote sensing - Remote sensing imaging - Satellite remote sensing

Classification code:441.2 Reservoirs - 511.2 Oil Field Equipment

DOI:10.3390/rs13193970

Funding details: Number: 59193, Acronym: -, Sponsor: -;Number: 51761135022,EP/R024537/1, Acronym: EPSRC, Sponsor: Engineering and Physical Sciences Research Council;Number: 41971318, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: -, Acronym: NWO, Sponsor: Nederlandse Organisatie voor Wetenschappelijk Onderzoek;Number: 05-Y30B01-9001-19/20-2, Acronym: -, Sponsor: National Major Science and Technology Projects of China;

Funding text:Funding: This research was jointly funded by High Resolution Earth Observation Systems of National Science and Technology Major Projects (No. 05-Y30B01-9001-19/20-2), the Joint Research Project of NSFC, NWO, and EPSRC (No. 51761135022, No. ALWSD.2016.026, No. EP/R024537/1), National Natural Science Foundation of China (No. 41971318), and Dragon 5 Cooperation (No. 59193).

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20214611177618

Title:Direct generation of ultrafast vortex beam from a Tm:CaYAlO<inf>4</inf> oscillator featuring pattern matching of a folded-cavity resonator (Open Access)

Authors:Cao, Xue (1); Liu, Yangyu (1); Xian, Anhua (1); Li, Yifei (1); Wu, Kun (1); Xu, Xiaodong (1); Zhou, Wei (1); Wang, Haotian (1); Huang, Haitao (1); Jia, Baohua (2); Wang, Yishan (3); Tang, Dingyuan (1); Shen, Deyuan (1, 4)

Author affiliation:(1) Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou; 221116, China; (2) Centre for Translational Atomaterials, School of Science, Computing and Engineering Technologies, Swinburne University of Technology, POB 218, Hawthorn; Vic; 3122, Australia; (3) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (4) Institute of mid infrared laser Technology (Jiangsu) Company, Ltd., Xuzhou; 221000, China

Source title:Optics Express

Abbreviated source title:Opt. Express

Volume:29

Issue:24

Issue date:November 22, 2021

Publication year:2021

Pages:39312-39322

Language:English

E-ISSN:10944087

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">Optical vortices, beams with spiral wavefronts and screw phase dislocations have been explored in applications in optical manipulation, quantum optics, and the next generation of optical communications. In traditional methods, optical vortices are generated using space light modulators or spiral phase plates, which would sharply decrease the integration of optical systems. Different from previous transverse mode conversion outside the cavity, here we experimentally demonstrate a direct generation of ultrafast vortex beam from a Tm:CaYAlO<inf>4</inf> oscillator by pattern matching of a six-mirror-folded-cavity resonator. By accurately adjusted the angle of the end mirror and the distance L between the M4 and the SESAMs to control the beam diameter of laser incidence on the gain medium in the sagittal and tangential planes, a stable 2 µm ultrafast vortex laser emission of annular Laguerre–Gaussian (LG) mode was obtained with a maximum output power of 327 mW and pulse duration of 2.1 ps. A simple YAG crystal plate was used as handedness selector and a homemade Mach–Zehnder (MZ) interferometer has verified the vortical property of the LG<inf>01</inf> mode. By furtherly controlling the cavity mode pattern matching, other stable transverse-mode operations for TEM<inf>00</inf>, high-order Hermite-Gaussian (HG) transverse mode and doughnut-shaped beams were successfully realized. This work provides a flexible and reliable way to generate mid-infrared ultrafast vortex beams and is of special significance for applications in the areas of molecular spectroscopy and organic material processing amongst others.<br/></div> © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Number of references:30

Main heading:Vortex flow

Controlled terms:Gaussian beams - Optical communication - Light modulators - Yttrium aluminum garnet - Laser mirrors - Pattern matching - Quantum optics

Uncontrolled terms:Direct generation - Folded-cavity resonators - Optical manipulation - Optical vortex beam - Optical vortices - Pattern-matching - Screw phase dislocation - Transverse-mode - Ultra-fast - Vortex beams

Classification code:631.1 Fluid Flow, General - 711 Electromagnetic Waves - 717.1 Optical Communication Systems - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 744.7 Laser Components - 804.2 Inorganic Compounds - 931.4 Quantum Theory; Quantum Mechanics

Numerical data indexing:Power 3.27E-01W, Time 2.10E-12s

DOI:10.1364/OE.437584

Funding details: Number: 2020XKT785,2020XKT797,2021XKT1246, Acronym: -, Sponsor: -;Number: 61805111,61805112, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 202010320129Y, Acronym: JSNU, Sponsor: Jiangsu Normal University;Number: SKLST201707, Acronym: SKLTOP, Sponsor: State Key Laboratory of Transient Optics and Photonics;Number: KYCX20_2343, Acronym: -, Sponsor: Graduate Research and Innovation Projects of Jiangsu Province;Number: KC21043, Acronym: -, Sponsor: Xuzhou Science and Technology Program;

Funding text:Funding. National Natural Science Foundation of China (61805111, 61805112); Graduate Research and Innovation Projects of Jiangsu Normal University in 2020 (2020XKT785, 2020XKT797, 2021XKT1246); Xuzhou Science and Technology Program (KC21043); Graduate Research and Innovation Projects of Jiangsu Province (KYCX20_2343); State Key Laboratory of Transient Optics and Photonics (SKLST201707); Development of Jiangsu Higher Education Institutions; Innovation Entrepreneurship Training program for College students in Jiangsu Normal University (202010320129Y).

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20213710877203

Title:A novel two-stage martensitic transformation induced by nanoscale concentration modulation in a TiNb-based shape memory alloy

Authors:Zhu, Jiaming (1); Zhang, Gang (2); Huang, He (3); Wang, Dong (4); Chen, Peijian (5); Yang, Xusheng (6, 7)

Author affiliation:(1) School of Civil Engineering, Shandong University, Jinan; 250061, China; (2) School of Physics and Optoelectronics Technology, Baoji University of Arts and Sciences, Baoji; 721016, China; (3) School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing; 100083, China; (4) Center of Microstructure Science, Frontier Institute of Science and Technology, Xi'an Jiaotong University, Xi'an; 710049, China; (5) State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou; Jiangsu; 221116, China; (6) State Key Laboratory of Ultra-precision Machining Technology, Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong; (7) Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen, China

Corresponding author:Zhu, Jiaming(zhujiaming@sdu.edu.cn)

Source title:Computational Materials Science

Abbreviated source title:Comput Mater Sci

Volume:200

Issue date:December 2021

Publication year:2021

Article number:110843

Language:English

ISSN:09270256

CODEN:CMMSEM

Document type:Journal article (JA)

Publisher:Elsevier B.V.

Abstract:<div data-language="eng" data-ev-field="abstract">Martensitic transformation (MT) plays a critical role in determining both mechanical and functional properties of shape memory alloys (SMAs). The behavior of MT depends strongly on the microstructure of materials, and two- or multiple-stage MTs are typical examples of this. However, the physical origin of two- or multiple-stage MTs remains controversial although much effort has been made. In this study, a novel two-stage MT is observed in a TiNb-based SMA with nanoscale concentration modulation. The physical origin of this chemical-heterogeneity-induced two-stage MT is the difference in thermodynamic stability of the parent and martensitic phase between Nb-leaner and Nb-richer regions. The findings of this study not only expand the repertoire of mechanisms of two- or multiple-stage MT but also shed light on the long-standing controversy over the physical origin of multiple-stage MTs.<br/></div> © 2021 Elsevier B.V.

Number of references:38

Main heading:Martensitic transformations

Controlled terms:Nanotechnology - Thermodynamic stability - Shape-memory alloy - Morphology - Chemical stability - Modulation

Uncontrolled terms:Chemical heterogeneities - Concentration modulation - Functional properties - Mechanical - Multiple stages - Nano scale - Parent phase - Phase field methods - Transformation-Induced - Two-stage martensitic transformation

Classification code:531.2 Metallography - 542.3 Titanium and Alloys - 641.1 Thermodynamics - 761 Nanotechnology - 801 Chemistry - 931.2 Physical Properties of Gases, Liquids and Solids - 951 Materials Science

DOI:10.1016/j.commatsci.2021.110843

Funding details: Number: 2021-Z10, Acronym: -, Sponsor: -;Number: -, Acronym: SDU, Sponsor: Shandong University;Number: 51701171, Acronym: NNSFC, Sponsor: National Natural Science Foundation of China;Number: 19JK0039, Acronym: -, Sponsor: Education Department of Shaanxi Province;

Funding text:JZ acknowledges the support of Qilu Young Talent Program from Shandong University and the State Key Lab of Advanced Metals and Materials (Grant No. 2021-Z10 ). GZ acknowledges the financial support from the Scientific Research Program Funded by Shaanxi Provincial Education Department (Program No. 19JK0039 ). XY acknowledges the support of the National Natural Science Foundation of China (Grants No. 51701171 ).

Database:Compendex

Accession number:20210910009286

Title:Nonlinear iterative perturbation scheme with simplified spherical harmonics (SP<inf>3</inf>) light propagation model for quantitative photoacoustic tomography

Authors:Wang, Yihan (1, 2); Xu, Menglu (1, 2); Gao, Feng (3, 4); Kang, Fei (5); Zhu, Shouping (1, 2)

Author affiliation:(1) School of Life Science and Technology, Xidian University, Xi'an, China; (2) Engineering Research Center of Molecular and Neuro Imaging of Ministry of Education, Xi'an, China; (3) College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin, China; (4) Tianjin Key Laboratory of Biomedical Detecting Techniques and Instruments, Tianjin University, Tianjin, China; (5) Department of Nuclear Medicine, Xijing Hospital, Fourth Military Medical University, Xi'an, China

Corresponding author:Zhu, Shouping(spzhu@xidian.edu.cn)

Source title:Journal of Biophotonics

Abbreviated source title:J. Biophotonics

Volume:14

Issue:6

Issue date:June 2021

Publication year:2021

Article number:e202000446

Language:English

ISSN:1864063X

E-ISSN:18640648

Document type:Journal article (JA)

Publisher:John Wiley and Sons Inc

Abstract:<div data-language="eng" data-ev-field="abstract">When using quantitative photoacoustic tomography (q-PAT) reconstruction to recover the optical absorption coefficients of tissue, the commonly used diffusion equation has several limitations in the case of the objects that have small geometries and high-absorption or low-scattering areas. Furthermore, the conventional perturbation reconstruction strategy is unsatisfactory when the target tissue containing large heterogeneous features. We herein present a modified q-PAT implementation that employs the higher-order photon migration model achieving the tradeoff between mathematical rigidity and computational efficiency. Besides, a nonlinear iterative method is proposed to obtain the perturbations of optical absorption considering the updating of the sensitivity matrix in calculating the fluence perturbations. Consequently, the distribution of tissue optical properties can be recovered in a robust way even if the targets with high absorption are included. The proposed approach has been validated by simulation, phantom and in vivo experiments, exhibiting promising performances in image fidelity and quantitative feasibility for practical applications.<br/></div> © 2021 Wiley-VCH GmbH

Number of references:51

Main heading:Iterative methods

Controlled terms:Image reconstruction - Computational efficiency - Tomography - Medical imaging - Optical properties - Tissue - Medical applications - Photoacoustic effect - Nonlinear optics

Uncontrolled terms:Heterogeneous features - In-vivo experiments - Iterative perturbation - Nonlinear iterative method - Optical absorption coefficients - Photoacoustic tomography - Spherical harmonics - Tissue optical properties

Classification code:461.1 Biomedical Engineering - 461.2 Biological Materials and Tissue Engineering - 741.1 Light/Optics - 741.1.1 Nonlinear Optics - 746 Imaging Techniques - 751.1 Acoustic Waves - 921.6 Numerical Methods

DOI:10.1002/jbio.202000446

Funding details: Number: 61471279,61901342,81871393, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2020JQ‐299, Acronym: -, Sponsor: Natural Science Foundation of Shaanxi Province;Number: 2016YFC0103800, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Funding text:National Key Research and Development Program of China, Grant/Award Number: 2016YFC0103800; National Natural Science Foundation of China, Grant/Award Numbers: 61471279, 61901342, 81871393; National Natural Science Foundation of Shaanxi Province, Grant/Award Number: 2020JQ‐299 Funding informationThe authors gratefully acknowledge the following grants support: the National Key Research and Development Program of China under Grant No. 2016YFC0103800, the National Natural Science Foundation of China under Grant Nos. 61901342, 61471279, 81871393 and the National Natural Science Foundation of Shaanxi Province under Grant No. 2020JQ‐299.

Database:Compendex

Accession number:20215011313015

Title:Summary of the R&D of 20-inch MCP-PMTs for neutrino detection

Authors:Wu, Q. (1, 2); Qian, S. (1); Cao, Y. (3); Huang, G. (3); Jin, M. (3); Jin, Z. (3); Li, D. (3); Liu, H. (4); Li, K. (3); Liu, S. (1); Ma, L. (1); Ren, L. (3); Si, S. (3); Sun, J. (3); Tian, J. (4); Wang, X. (3); Zhan, H. (3); Zhu, Y. (1)

Author affiliation:(1) Institute of High Energy Physics, Chinese Academy of Sciences, 19B Yuquan Road, Beijing, China; (2) School of Physical Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing, China; (3) North Night Vision Science and Technology (Nanjing) Research Institute Co. Ltd, 2 Kangping Street, Nanjing, China; (4) Xi'An Institute of Optics and Precision Mechanics, 17 Information Avenue, China

Corresponding author:Qian, S.(qians@ihep.ac.cn)

Source title:Journal of Instrumentation

Abbreviated source title:J. Instrum.

Volume:16

Issue:11

Issue date:November 2021

Publication year:2021

Article number:C11003

Language:English

E-ISSN:17480221

Document type:Journal article (JA)

Publisher:IOP Publishing Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">The Jiangmen Underground Neutrino Observatory (JUNO) in China aiming to determine the neutrino mass hierarchy is under construction. A new kind of large area microchannel-plate photomultiplier tube (MCP-PMT) was put forward for the JUNO by the researchers in Institute of High Energy Physics (IHEP) in China. After breaking through several core technotical barriers, the 20-inch MCP-PMT prototype with great performance was successfully produced by the MCP-PMT group in China and got 75% PMT orders (15,000 pics) from JUNO. The mass production line and batch test system was completed in North Night Vision Technology Co., Ltd. (NNVT). The performance of the MCP-PMT including the gain, the quantum efficiency, the P/V ratio, the dark count rate and the transit time spread can be batch tested. During the mass production process, the technical progress in the cathode deposition method improved the quantum efficiency of the photocathode from 30% to 35%. The aging behaviour, temperature effect, the after-pulse distribution and the flash signal of the 20-inch MCP-PMT are all detailly studied. By August of 2020, the 15,000 MCP-PMTs, which will be installed as the central liquid scintillator detector of JUNO, have been completed and delivered to Jiangmen. The average QE at 400 nm for the 15,000 pieces of MCP-PMTs is 32%.<br/></div> © 2021 IOP Publishing Ltd and Sissa Medialab.

Number of references:31

Main heading:Photons

Controlled terms:Photomultipliers - Quantum efficiency - Particle beams - Particle detectors - Neutrons - Photodetectors

Uncontrolled terms:MCP-PMT - Micro-channel plate photomultiplier tubes - Microchannel-plate photomultiplier tubes - Neutrino detectors - Neutrinos detections - Performance - Photon detector for UV, visible and IR photon (vacuum) - Photon detector for UV, visible and IR photon (vacuum) (photomultiplier, HPD, other) - UV-visible

Classification code:714.1 Electron Tubes - 931.3 Atomic and Molecular Physics - 931.4 Quantum Theory; Quantum Mechanics - 932.1 High Energy Physics - 944.7 Radiation Measuring Instruments

Numerical data indexing:Percentage 3.00E+01% to 3.50E+01%, Percentage 3.20E+01%, Percentage 7.50E+01%, Size 4.00E-07m, Size 5.08E-01m

DOI:10.1088/1748-0221/16/11/C11003

Database:Compendex

Accession number:20214811241472

Title:Tunable terahertz metamaterial wideband absorber with liquid crystal (Open Access)

Authors:Deng, Guangsheng (1, 2); Hu, Hualong (3); Mo, Haisheng (2); Xu, Junjie (3); Yin, Zhiping (1, 2); Lu, Hongbo (1, 2); Hu, Minggang (4); Li, Jian (4); Yang, Jun (1, 2)

Author affiliation:(1) Special Display and Imaging Technology Innovation Center of Anhui Province, Academy of Opto-Electronic Technology, Hefei University of Technology, Hefei; 230009, China; (2) Anhui Province Key Laboratory of Measuring Theory and Precision Instrument, School of Instrument Science and Optoelectronics Engineering, Hefei University of Technology, Hefei; 230009, China; (3) School of Electronic Science and Applied Physics, Hefei University of Technology, Hefei; 230009, China; (4) Xi An Modern Chemistry Research Institute, Xi'an; 710065, China

Corresponding author:Yang, Jun(junyang@hfut.edu.cn)

Source title:Optical Materials Express

Abbreviated source title:Opt. Mater. Express

Volume:11

Issue:12

Issue date:December 1, 2021

Publication year:2021

Pages:4026-4035

Language:English

E-ISSN:21593930

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">In this paper, a tunable metamaterial absorber (MA) based on liquid crystal (LC) with wideband absorption is presented. The design and absorption principle of the absorber is introduced, and the simulation analysis is conducted. The results show that the center resonant frequency of the proposed absorber is 130.0 GHz without a bias voltage. When the bias voltage increases to saturation, the center resonant frequency of the absorber is tuned to 119.9 GHz, with a frequency tunability of 7.8%. Moreover, the tunable absorber exhibits wideband absorption characteristics and maintains absorption above 90% in the frequency range of 127.7 GHz to 132.3 GHz with no bias voltage, with a relative absorption bandwidth of 3.5%. While under the saturation voltage, absorption greater than 90% can be achieved from 117.9 to 121.8 GHz, with a relative absorption bandwidth of 3.3%. The wideband absorption effect of the proposed LC-based tunable MA makes it a promising candidate for applications such as electromagnetic shielding and stealth.<br/></div> © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.

Number of references:33

Main heading:Liquid crystals

Controlled terms:Metamaterials - Bias voltage - Electromagnetic shielding - Bandwidth - Natural frequencies

Uncontrolled terms:Frequency tunability - Liquid-crystals - Metamaterial absorbers - Relative absorptions - Simulation analysis - Tera Hertz - Tunable metamaterials - Tunables - Voltage increase - Wide-band

Classification code:713 Electronic Circuits - 716.1 Information Theory and Signal Processing - 951 Materials Science

Numerical data indexing:Frequency 1.179E+11Hz to 1.218E+11Hz, Frequency 1.199E+11Hz, Frequency 1.277E+11Hz to 1.323E+11Hz, Frequency 1.30E+11Hz, Percentage 3.30E+00%, Percentage 3.50E+00%, Percentage 7.80E+00%, Percentage 9.00E+01%

DOI:10.1364/OME.444899

Funding details: Number: 61871171, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2020Z0560P4001, Acronym: -, Sponsor: Aeronautical Science Foundation of China;Number: JD2020JGPY0012, Acronym: -, Sponsor: Fundamental Research Funds for the Central Universities;

Funding text:Funding. National Natural Science Foundation of China (61871171); Aeronautical Science Foundation of China (2020Z0560P4001); Fundamental Research Funds for the Central Universities (JD2020JGPY0012).

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20212610574668

Title:Organelle-specific phase contrast microscopy enables gentle monitoring and analysis of mitochondrial network dynamics (Open Access)

Authors:Guo, Siyue (1); Ma, Ying (1, 2); Pan, Yang (1); Smith, Zachary J. (1, 4); Chu, Kaiqin (1, 3, 4)

Author affiliation:(1) Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Anhui, Hefei; 230027, China; (2) School of Physics and Optoelectronic Engineering, Xidian University, Shanxi, Xi'an; 710071, China; (3) Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Anhui, Hefei; 230027, China; (4) Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes, University of Science and Technology of China, Anhui, Hefei; 230027, China

Source title:Biomedical Optics Express

Abbreviated source title:Biomed. Opt. Express

Volume:12

Issue:7

Issue date:July 1, 2021

Publication year:2021

Pages:4363-4379

Language:English

E-ISSN:21567085

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">Mitochondria are delicate organelles that play a key role in cell fate. Current research methods rely on fluorescence labeling that introduces stress due to photobleaching and phototoxicity. Here we propose a new, gentle method to study mitochondrial dynamics, where organelle-specific three-dimensional information is obtained in a label-free manner at high resolution, high specificity, and without detrimental effects associated with staining. A mitochondria cleavage experiment demonstrates that not only do the label-free mitochondria-specific images have the required resolution and precision, but also fairly include all cells and mitochondria in downstream morphological analysis, while fluorescence images omit dim cells and mitochondria. The robustness of the method was tested on samples of different cell lines and on data collected from multiple systems. Thus, we have demonstrated that our method is an attractive alternative to study mitochondrial dynamics, connecting behavior and function in a simpler and more robust way than traditional fluorescence imaging.<br/></div> © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Number of references:45

Main heading:Mitochondria

Controlled terms:Fluorescence imaging - Photobleaching - Cell proliferation - Cell culture - Dynamics

Uncontrolled terms:Fluorescence labeling - High specificity - Monitoring and analysis - Morphological analysis - Multiple systems - Network dynamics - Phase-contrast microscopy - Three-dimensional information

Classification code:461.2 Biological Materials and Tissue Engineering - 461.9 Biology - 741.1 Light/Optics - 746 Imaging Techniques - 801 Chemistry

DOI:10.1364/BOE.425848

Funding details: Number: 202003a07020020, Acronym: -, Sponsor: -;Number: 2017YFA0505300, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Funding text:Funding. National Key Research and Development Program of China (2017YFA0505300); Anhui Province Key R & D Project (202003a07020020).

Database:Compendex

Open Access type(s): All Open Access, Gold, Green

Accession number:20214311054909

Title:Uav-borne hyperspectral imaging remote sensing system based on acousto-optic tunable filter for water quality monitoring (Open Access)

Authors:Liu, Hong (1, 2, 3, 4); Yu, Tao (1, 3, 4); Hu, Bingliang (1, 3, 4); Hou, Xingsong (2); Zhang, Zhoufeng (1, 3); Liu, Xiao (1, 3); Liu, Jiacheng (1, 3, 4); Wang, Xueji (1, 3); Zhong, Jingjing (4); Tan, Zhengxuan (5); Xia, Shaoxia (6); Qian, Bao (7)

Author affiliation:(1) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) School of Electronic and Information Engineering, Xi’an Jiao Tong University, Xi’an; 710049, China; (3) Key Laboratory of Spectral Imaging Technology, Chinese Academy of Sciences, Xi’an; 710119, China; (4) School of Optoelectronics, University of Chinese Academy of Sciences, Beijing; 100049, China; (5) Department of Computer Sciences, University of Miami, Miami; FL; 33136, United States; (6) Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing; 100101, China; (7) Bureau of Hydrology Changjiang Water Resources Commission—CWRC, Wuhan; 443010, China

Corresponding author:Yu, Tao(yutao@opt.ac.cn)

Source title:Remote Sensing

Abbreviated source title:Remote Sens.

Volume:13

Issue:20

Issue date:October-2 2021

Publication year:2021

Article number:4069

Language:English

E-ISSN:20724292

Document type:Journal article (JA)

Publisher:MDPI

Abstract:<div data-language="eng" data-ev-field="abstract">Unmanned aerial vehicle (UAV) hyperspectral remote sensing technologies have unique advantages in high-precision quantitative analysis of non-contact water surface source concentration. Improving the accuracy of non-point source detection is a difficult engineering problem. To facilitate water surface remote sensing, imaging, and spectral analysis activities, a UAV-based hyperspectral imaging remote sensing system was designed. Its prototype was built, and laboratory calibration and a joint air–ground water quality monitoring activity were performed. The hyperspectral imaging remote sensing system of UAV comprised a light and small UAV platform, spectral scanning hyperspectral imager, and data acquisition and control unit. The spectral principle of the hyperspectral imager is based on the new high-performance acousto-optic tunable (AOTF) technology. During laboratory calibration, the spectral calibration of the imaging spectrometer and image preprocessing in data acquisition were completed. In the UAV air–ground joint experiment, combined with the typical water bodies of the Yangtze River mainstream, the Three Gorges demonstration area, and the Poyang Lake demonstration area, the hyperspectral data cubes of the corresponding water areas were obtained, and geometric registration was completed. Thus, a large field-of-view mosaic and water radiation calibration were realized. A chlorophyl-a (Chl-a) sensor was used to test the actual water control points, and 11 traditional Chl-a sensitive spectrum selection algorithms were analyzed and compared. A random forest algorithm was used to establish a prediction model of water surface spectral reflectance and water quality parameter concentration. Compared with the back propagation neural network, partial least squares, and PSO-LSSVM algorithms, the accuracy of the RF algorithm in predicting Chl-a was significantly improved. The determination coefficient of the training samples was 0.84; root mean square error, 3.19 µg/L; and mean absolute percentage error, 5.46%. The established Chl-a inversion model was applied to UAV hyperspectral remote sensing images. The predicted Chl-a distribution agreed with the field observation results, indicating that the UAV-borne hyperspectral remote sensing water quality monitoring system based on AOTF is a promising remote sensing imaging spectral analysis tool for water.<br/></div> © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Number of references:90

Main heading:Remote sensing

Controlled terms:Groundwater - Hyperspectral imaging - Quality control - Spectroscopy - Decision trees - Water quality - Antennas - Data acquisition - Infrared devices - Least squares approximations - Neural networks - Calibration - Unmanned aerial vehicles (UAV) - Spectrum analysis - Mean square error

Uncontrolled terms:Acoustooptic tunable filters (AOTF) - Air grounds - HyperSpectral - Remote sensing imaging - Remote sensing system - Remote-sensing - Unmanned aerial vehicle platform - Vehicle platforms - Water quality monitoring - Water surface

Classification code:444.2 Groundwater - 445.2 Water Analysis - 652.1 Aircraft, General - 723.2 Data Processing and Image Processing - 746 Imaging Techniques - 913.3 Quality Assurance and Control - 921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory - 921.6 Numerical Methods - 922.2 Mathematical Statistics - 961 Systems Science

Numerical data indexing:Percentage 5.46E+00%

DOI:10.3390/rs13204069

Funding details: Number: 11727806,XAB2017B25, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: XDA23040101, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: 2017YFC1403700, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Funding text:Funding: This research was funded by class a plan of major strategic pilot project of the Chinese Academy of Sciences: XDA23040101; National Key R&D Program of China: 2017YFC1403700; National Natural Science Foundation of China: 11727806; "Light of the West" project of Chinese Academy of Sciences: XAB2017B25.

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20213010692676

Title:Penta-PdPSe: A New 2D Pentagonal Material with Highly In-Plane Optical, Electronic, and Optoelectronic Anisotropy

Authors:Li, Peiyang (1); Zhang, Jiantian (1); Zhu, Chao (2); Shen, Wanfu (3); Hu, Chunguang (3); Fu, Wei (4); Yan, Luo (5); Zhou, Liujiang (5); Zheng, Lu (6); Lei, Hongxiang (1); Liu, Zheng (2); Zhao, Weina (7); Gao, Pingqi (1); Yu, Peng (1); Yang, Guowei (1)

Author affiliation:(1) State Key Laboratory of Optoelectronic Materials and Technologies, School of Materials Science and Engineering, School of Materials, Sun Yat-sen University, Guangzhou; 510275, China; (2) School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore; 639798, Singapore; (3) State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin; 300072, China; (4) Centre of Advanced 2D Materials, National University of Singapore, 1 Science Drive 3, Singapore; 117550, Singapore; (5) Institute of Fundamental and Frontier Sciences, Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Chengdu; 610054, China; (6) Frontiers Science Center for Flexible Electronics, Xi'an Institute of Flexible Electronics (IFE), Northwestern Polytechnical University, 127 West Youyi Road, Xi'an; 710072, China; (7) Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Institute of Environmental Health and Pollution Control, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou; 510006, China

Corresponding authors:Gao, Pingqi(gaopq3@mail.sysu.edu.cn); Yu, Peng(yupeng9@mail.sysu.edu.cn); Zhao, Weina(zhaowngd@gdut.edu.cn)

Source title:Advanced Materials

Abbreviated source title:Adv Mater

Volume:33

Issue:35

Issue date:September 2, 2021

Publication year:2021

Article number:2102541

Language:English

ISSN:09359648

E-ISSN:15214095

CODEN:ADVMEW

Document type:Journal article (JA)

Publisher:John Wiley and Sons Inc

Abstract:<div data-language="eng" data-ev-field="abstract">Due to their low-symmetry lattice characteristics and intrinsic in-plane anisotropy, 2D pentagonal materials, a new class of 2D materials composed entirely of pentagonal atomic rings, are attracting increasing research attention. However, the existence of these 2D materials has not been proven experimentally until the recent discovery of PdSe<inf>2</inf>. Herein, penta-PdPSe, a new 2D pentagonal material with a novel low-symmetry puckered pentagonal structure, is introduced to the 2D family. Interestingly, a peculiar polyanion of [Se-P-P-Se]<sup>4−</sup> is discovered in this material, which is the biggest polyanion in 2D materials yet discovered. Strong intrinsic in-plane anisotropic behavior endows penta-PdPSe with highly anisotropic optical, electronic, and optoelectronic properties. Impressively, few-layer penta-PdPSe-based phototransistor not only achieves excellent electronic performances, a moderate electron mobility of 21.37 cm<sup>2</sup> V<sup>−1</sup> s<sup>−1</sup> and a high on/off ratio of up to 10<sup>8</sup>, but it also has a high photoresponsivity of ≈5.07 × 10<sup>3</sup> A W<sup>−1</sup> at 635 nm, which is ascribed to the photogating effect. More importantly, penta-PdPSe also exhibits a large anisotropic conductance (σ<inf>max</inf>/σ<inf>max</inf> = 3.85) and responsivity (R<inf>max</inf>/R<inf>min</inf> = 6.17 at 808 nm), superior to most 2D anisotropic materials. These findings make penta-PdPSe an ideal material for the design of next-generation anisotropic devices.<br/></div> © 2021 Wiley-VCH GmbH

Number of references:66

Main heading:Anisotropy

Controlled terms:Optical lattices - Phototransistors

Uncontrolled terms:Anisotropic behaviors - Anisotropic conductance - Anisotropic material - Electronic performance - In-plane anisotropy - On/off ratio - Optoelectronic properties - Photoresponsivity

Classification code:714.2 Semiconductor Devices and Integrated Circuits - 744.8 Laser Beam Interactions - 931.2 Physical Properties of Gases, Liquids and Solids

DOI:10.1002/adma.202102541

Funding details: Number: 2017BT01Z032, Acronym: -, Sponsor: Guangdong Provincial Pearl River Talents Program;Number: 22006023, Acronym: NNSFC, Sponsor: National Natural Science Foundation of China;Number: 29000–18841216,29000–31610036, Acronym: SYSU, Sponsor: Sun Yat-sen University;Number: 2019A1515010428, Acronym: -, Sponsor: Natural Science Foundation of Guangdong Province;Number: 202102020126, Acronym: -, Sponsor: Guangzhou Municipal Science and Technology Project;

Funding text:This work was financially supported by "100 Top Talents Program" of Sun Yat‐sen University (Grant No. 29000–18841216) and "Young‐teacher Training Program" of Sun Yat‐sen University (Grant No. 29000–31610036). This work was also supported by National Natural Science Foundation of China (Grant No. 22006023) and Natural Science Foundation of Guangdong Province (Grant No. 2019A1515010428). The authors also thank Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (Program No. 2017BT01Z032) and Guangzhou Science and Technology Project (Project No. 202102020126).

Database:Compendex

Accession number:20210209764290

Title:Development of a self-calibration method for real-time monitoring of SO<inf>2</inf> ship emissions with UV cameras (Open Access)

Authors:Wu, Kuijun (1); Xiong, Yuanhui (2, 3); Feng, Yutao (4); Yu, Yi (5); Li, Faquan (2)

Author affiliation:(1) School of Opto-Electronic Information Science and Technology, Yantai University, Yantai; 264005, China; (2) State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute ofPhysics and Mathematics, Innovation Academy of Precision Measurement Science and Technology, ChineseAcademy of Sciences, Wuhan National Laboratory for Optoelectronics, Wuhan; 430071, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China; (4) Key Laboratory of Spectral Imaging Technology of Chinese Academy of Sciences, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (5) College of Meteorology and Oceanography, National University of Defense Technology, Changsha; 410073, China

Corresponding author:Li, Faquan(lifaquan@wipm.ac.cn)

Source title:Optics Express

Abbreviated source title:Opt. Express

Volume:29

Issue:2

Issue date:January 18, 2021

Publication year:2021

Pages:1813-1823

Language:English

E-ISSN:10944087

Document type:Journal article (JA)

Publisher:OSA - The Optical Society

Abstract:Self-calibration of UV cameras was demonstrated for the first time. This novel method has the capability of real-time continuous calibration by using the raw images at 310 nm and 330 nm without changing the viewing direction or adding any additional equipment. The methodology was verified through simulations and experiments and demonstrated to be of greatly improved effectiveness and accuracy. The errors of self-calibration mothed are estimated by comparison with the differential optical absorption spectroscopy (DOAS) approach, and it can be reduced to 1.8% after filter transmittance corrections. The results show that the self-calibration method appears to have great potential as a future technique for quantitative and visual real-time monitoring of SO<inf>2</inf> emissions from ships and other point sources (such as oil refineries, power plants, or more broadly, any industrial stack) when the field of view (FOV) of the system is not completely covered by the SO<inf>2</inf> plumes.<br/> © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Number of references:18

Main heading:Calibration

Controlled terms:Industrial emissions - Ships - Cameras - Industrial plants - Absorption spectroscopy - Light absorption

Uncontrolled terms:Additional equipment - Continuous calibrations - Differential optical absorption spectroscopy - Real time monitoring - Self calibration - Self-calibration method - Ship emissions - Viewing directions

Classification code:451.1 Air Pollution Sources - 741.1 Light/Optics - 742.2 Photographic Equipment

Numerical data indexing:Size 3.10e-07m, Size 3.30e-07m, Percentage 1.80e+00%

DOI:10.1364/OE.415156

Funding details: Number: 41975039,61705253, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: 2017YFC0211900, Acronym: NKRDPC, Sponsor: National Key Research and Development Program of China;

Funding text:Funding. National Key Research and Development Program of China (2017YFC0211900); National Natural Science Foundation of China (41975039, 61705253).

Database:Compendex

Open Access type(s): All Open Access, Gold

Accession number:20213610849496

Title:Characteristics of nonlinear terahertz-wave radiation generated by mid-infrared femtosecond pulse laser excitation (Open Access)

Authors:Shibuya, Kyuki (1, 2, 3); Nawata, Kouji (3); Nakajima, Yoshiaki (2, 4); Fu, Yuxi (5, 6); Takahashi, Eiji J. (5); Midorikawa, Katsumi (5); Yasui, Takeshi (2, 7); Minamide, Hiroaki (3)

Author affiliation:(1) Graduate School of Technology, Industrial and Social Sciences, Tokushima University, Japan; (2) JST, ERATO MINOSHIMA Intelligent Optical Synthesizer (IOS) Project, Japan; (3) Tera-Photonics Research Team, RIKEN Center for Advanced Photonics, RIKEN, Japan; (4) Department of Physics, Faculty of Sciences, Toho University, Japan; (5) Attosecond Science Research Team, RIKEN Center for Advanced Photonics, RIKEN, Japan; (6) Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, China; (7) Institute of Post-LED Photonics (PLED), Tokushima University, Japan

Corresponding author:Shibuya, Kyuki(shibuya.tokudai@gmail.com)

Source title:Applied Physics Express

Abbreviated source title:Appl. Phys. Express

Volume:14

Issue:9

Issue date:September 2021

Publication year:2021

Article number:092004

Language:English

ISSN:18820778

E-ISSN:18820786

Document type:Journal article (JA)

Publisher:IOP Publishing Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">We report on efficient terahertz-wave generation in organic and inorganic crystals by nonlinear wavelength conversion approach using a 3.3 μm femtosecond pulse laser. Experimental results reveal the relation between pump power and terahertz-wave output power, which is proportional to the square of the pump power at the range of mega- to tera-watt cm-2 class even if the pump wavelength is different. Damage threshold of organic and inorganic crystals are recorded 0.6 and 18 tera-watt cm-2 by reducing several undesirable nonlinear optical effects using mid-infrared source.<br/></div> © 2021 The Japan Society of Applied Physics.

Number of references:32

Main heading:Terahertz waves

Controlled terms:Electromagnetic pulse - Nonlinear optics - Organic lasers - Infrared devices - Crystals - Laser excitation

Uncontrolled terms:Damage threshold - Femtosecond pulse laser - Inorganic crystals - Mid-infrared sources - Nonlinear optical effects - Pump wavelength - Terahertz wave generation - Terahertz wave radiations

Classification code:701 Electricity and Magnetism - 711 Electromagnetic Waves - 741.1.1 Nonlinear Optics - 744.1 Lasers, General - 744.9 Laser Applications - 801.4 Physical Chemistry - 933.1 Crystalline Solids

Numerical data indexing:Size 3.30e-06m

DOI:10.35848/1882-0786/ac1a48

Database:Compendex

Open Access type(s): All Open Access, Hybrid Gold

Accession number:20212110397292

Title:Multi-color structured illumination microscopy for live cell imaging based on the enhanced image recombination transform algorithm (Open Access)

Authors:Zhao, Tianyu (1, 2, 3); Hao, Huiwen (4); Wang, Zhaojun (1); Liang, Yansheng (1); Feng, Kun (1); He, Minru (2, 3); Yun, Xue (1); Bianco, Piero R. (5); Sun, Yujie (4); Yao, Baoli (2, 3); Lei, Ming (1, 3)

Author affiliation:(1) MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter, School of Physics, Xi’an Jiaotong University, Xi’an; 710049, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and PrecisionMechanics, Chinese Academy of Sciences, Xi’an, Shaanxi; 710119, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, China; (4) State Key Laboratory of Membrane Biology & Biomedical Pioneer Innovation Center (BIOPIC), School of Life Sciences, Peking University, Beijing; 100871, China; (5) Department of Pharmaceutical Sciences, College of Pharmacy, University of Nebraska Medical Center, Omaha; NE; 68198-6025, United States

Corresponding author:Lei, Ming(ming.lei@mail.xjtu.edu.cn)

Source title:Biomedical Optics Express

Abbreviated source title:Biomed. Opt. Express

Volume:12

Issue:6

Issue date:June 1, 2021

Publication year:2021

Pages:3474-3484

Language:English

E-ISSN:21567085

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:<div data-language="eng" data-ev-field="abstract">Structured illumination microscopy (SIM) has attracted considerable interest in superresolution, live-cell imaging because of its low light dose and high imaging speed. Obtaining a high-quality reconstruction image in SIM depends on the precise determination of the parameters of the fringe illumination pattern. The image recombination transform (IRT) algorithm is superior to other algorithms in obtaining the precise initial phase without any approximation, which is promising to provide a considerable solution to address the difficulty of initial phase estimation at low-modulation-depth conditions. However, the IRT algorithm only considers a phase shift of π/2, which limits its applications in general scenarios. In this letter, we present a general form of IRT algorithm suitable for arbitrary phase shifts, providing a powerful tool for parameter estimation in low signal-to-noise cases. To demonstrate the effectiveness of the enhanced IRT algorithm, we constructed a multicolor, structured illumination microscope and studied at super-resolution, the cargo traffic in HRPE cells, and monitored the movement of mitochondrial structures and microtubules in COS-7 cells. The custom SIM system using the enhanced IRT algorithm allows multicolor capability and a low excitation intensity fluorescence imaging less than 1 W/cm<sup>2</sup>. High-quality super-resolution images are obtained, which demonstrates the utility of this approach in imaging in the life sciences.<br/></div> © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Number of references:30

Main heading:Cells

Controlled terms:Image enhancement - Approximation algorithms - Cytology - Optical resolving power - Signal to noise ratio - Fluorescence imaging

Uncontrolled terms:Arbitrary phase shifts - Excitation intensity - High quality reconstruction - Illumination patterns - Precise determinations - Structured illumination - Structured illumination microscopies (SIM) - Structured illumination microscopy

Classification code:461.2 Biological Materials and Tissue Engineering - 461.9 Biology - 716.1 Information Theory and Signal Processing - 741.1 Light/Optics - 746 Imaging Techniques - 921 Mathematics

Numerical data indexing:Surface_Power_Density 1.00e+04W/m2

DOI:10.1364/BOE.423171

Funding text:Funding. National Natural Science Foundation of China (61905189, 62005208); China Postdoctoral Science Foundation (2019M663656, 2020M673365); National Key Research and Development Program of China (2017YFC0110100); National Institutes of Health (GM100156).Acknowledgments. We are very grateful to the former member of the research team, Dr. Zhou Xing, for his original work on the IRT algorithm. We thank Chen Zhixing at Peking University for assistance with mitochondrial dye. This work was supported by the Natural Science Foundation of China (NSFC) (62005208, 61905189); China Postdoctoral Science Foundation (2020M673365, 2019M663656); National Key Research and Development Program of China (2017YFC0110100), and National Institutes of Health Grant GM100156 to PRB.

Database:Compendex

Open Access type(s): All Open Access, Gold, Green

Accession number:20210509858777

Title:Optical Waveguide Color Tuning by Fluorescence–Phosphorescence Dual Emission and Disparity of Optical Losses

Authors:Wang, Zheng (1, 2); Mo, Jun-Ting (1); Chen, Ling (3); Zhu, Cheng-Yi (1); Zhang, Qiang-Sheng (1); Yu, Yong-Qin (4); Pan, Mei (1)

Author affiliation:(1) MOE Laboratory of Bioinorganic and Synthetic Chemistry, Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-Sen University, Guangzhou; 510275, China; (2) College of Chemistry and Chemical Engineering, Key Laboratory of Chemical Additives for China National Light Industry, Shaanxi University of Science and Technology, Xi'an; 710021, China; (3) School of Biotechnology and Health Science, Wuyi University, Jiangmen; 529000, China; (4) Key Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes, Shenzhen Technology University, Shenzhen; 518060, China

Corresponding author:Pan, Mei(panm@mail.sysu.edu.cn)

Source title:Advanced Optical Materials

Abbreviated source title:Adv. Opt. Mater.

Volume:9

Issue:7

Issue date:April 6, 2021

Publication year:2021

Article number:2001591

Language:English

E-ISSN:21951071

Document type:Journal article (JA)

Publisher:John Wiley and Sons Inc

Abstract:<div data-language="eng" data-ev-field="abstract">Organic photonic materials have high refractive index, fast transfer speed, low heat generation, and so on; and therefore, have great potential in optoelectronics and optical micro/nanocircuits. Herein, a new strategy using fluorescence–phosphorescence dual emission and disparity of optical loss in a smooth needle-like organic crystal is reported to realize color tuning of the optical waveguide (OWG). Especially, a warm white-light OWG emission is achieved by appropriately adjusting the excitation position, presenting the first report of single-component organic waveguide with white light emission. Based on this, the as-prepared 1D organic crystal has been demonstrated as a microscale optical correspondence device with multiple input and output responses, which offers potential applications in modern optics and photonics fields.<br/></div> © 2021 Wiley-VCH GmbH

Number of references:36

Main heading:Fluorescence

Controlled terms:Light transmission - Light - Phosphorescence - Color - Crystal structure - Optical waveguides - Refractive index

Uncontrolled terms:Excitation position - High refractive index - Multiple inputs - Organic crystal - Organic photonics - Organic waveguides - Single components - White light emission

Classification code:714.3 Waveguides - 741.1 Light/Optics - 741.3 Optical Devices and Systems - 933.1.1 Crystal Lattice

DOI:10.1002/adom.202001591

Funding details: Number: 2017BT01C161, Acronym: -, Sponsor: Guangdong Provincial Pearl River Talents Program;Number: 21720102007,21771197,21821003, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: JCYJ20200109144012410, Acronym: -, Sponsor: Science and Technology Planning Project of Shenzhen Municipality;

Funding text:Z.W. and J.‐T.M. contributed equally to this work. This work was financially supported by the National Natural Science Foundation of China (21771197, 21821003, 21720102007), Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01C161), Shenzhen Science and Technology Project under Grants No. JCYJ20200109144012410, and FRF for the Central Universities.

Database:Compendex

Accession number:20220140442

Title:All-optical radio frequency spectrum analyzer with a 5 THz bandwidth based on CMOS-compatible high-index doped silica waveguides

Authors:Moss, David J. (8); Li, Yuhua (1, 2); Kang, Zhe (3, 4); Zhu, Kun (2); Ai, Shiqi (2); Wang, Xiang (5); Davidson, Roy R. (5); Wu, Yan (1); Morandotti, Roberto (6); Little, Brent E. (7); Chu, Sai Tak (2)

Author affiliation:(1) Key Laboratory of Optical Field Manipulation of Zhejiang Province, Department of Physics, Zhejiang Sci-Tech University, Zhejiang, Hangzhou; 310018, China; (2) Department of Physics, City University of Hong Kong, Kowloon Tong, 999077, Hong Kong; (3) Ningbo Research Institute, Zhejiang University, Ningbo; 310000, China; (4) Centre for Optical and Electromagnetic Research, National Engineering Research Center for Optical Instruments, Zhejiang University, Hangzhou; 315000, China; (5) QXP Technology, Xi’an; 710311, China; (6) INRS-Énergie, Matériaux et Télécommunications, Varennes; J3X 1S2, Canada; (7) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Science, Xi’an; 710119, China; (8) Optical Sciences Centre, Swinburne University of Technology, Hawthorn; VIC; 3122, Australia

Corresponding authors:Zhu, Kun(kenny.kun.zhu@gmail.com); Chu, Sai Tak(saitchu@cityu.edu.hk)

Source title:TechRxiv

Abbreviated source title:TechRxiv

Issue date:January 25, 2021

Publication year:2021

Language:English

Document type:Preprint (PP)

Publisher:TechRxiv

Number of references:26

Main heading:Spectrum analyzers

Controlled terms:Bandwidth - CMOS integrated circuits - Fiber lasers - Nonlinear optics - Radio waves - Silica - Waveguides

Uncontrolled terms:All optical - CMOS Compatible - CMOS compatible waveguide - Doped silicas - Higher index - Long spirals - Radio frequency spectrum - Radiofrequencies - Silica waveguide - Tera Hertz

Numerical data indexing:Frequency 5.00E+12Hz, Size 5.00E-01m

DOI:10.36227/techrxiv.13635380

Database:Compendex

Preprint source website:https://www.techrxiv.org/

Preprint ID type:TECHRXIV

Accession number:20211310136038

Title:All-optical RF spectrum analyzer with a 5 THz bandwidth based on CMOS-compatible high-index doped silica waveguides (Open Access)

Author affiliation:(1) Key Laboratory of Optical Field Manipulation of Zhejiang Province, Department of Physics, Zhejiang Sci-Tech University, Hangzhou; 310018, China; (2) Department of Physics, City University of Hong Kong, Kowloon Tong, Hong Kong; 999077, China; (3) Ningbo Research Institute, Zhejiang University, Ningbo; 315100, China; (4) Centre for Optical and Electromagnetic Research, National Engineering Research Center for Optical Instruments, Zhejiang University, Hangzhou; 310058, China; (5) QXP Technology, Xi’an; 710311, China; (6) INRS-Énergie, Matériaux et Télécommunications, Varennes; J3X 1S2, Canada; (7) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Science, Xi’an; 710119, China; (8) Optical Sciences Centre, Swinburne University of Technology, Hawthorn; VIC; 3122, Australia

Corresponding author:Zhu, Kun(kenny.kun.zhu@gmail.com)

Source title:Optics Letters

Abbreviated source title:Opt. Lett.

Volume:46

Issue:7

Issue date:April 1, 2021

Publication year:2021

Pages:1574-1577

Language:English

ISSN:01469592

E-ISSN:15394794

CODEN:OPLEDP

Document type:Journal article (JA)

Publisher:The Optical Society

Abstract:We report an all-optical radio-frequency (RF) spectrum analyzer with a bandwidth greater than 5 THz, based on a 50 cm long spiral waveguide in a CMOS-compatible high-index doped silica platform. By carefully mapping out the dispersion profile of the waveguides for different thicknesses, we identify the optimal design to achieve near-zero dispersion in the C-band. To demonstrate the capability of the RF spectrum analyzer, we measure the optical output of a femtosecond fiber laser with an ultrafast optical RF spectrum in the terahertz regime.<br/> © 2021 Optical Society of America

Number of references:21

Main heading:Spectrum analyzers

Controlled terms:Silica - Fiber lasers - Bandwidth - CMOS integrated circuits - Waveguides

Uncontrolled terms:All-optical RF-spectrum analyzers - CMOS Compatible - Dispersion profile - Femtosecond fiber lasers - Near-zero dispersions - Optical output - Optimal design - Radio frequency spectrum

Classification code:714.2 Semiconductor Devices and Integrated Circuits - 714.3 Waveguides - 716.1 Information Theory and Signal Processing - 744.4 Solid State Lasers

Numerical data indexing:Frequency 5.00e+12Hz, Size 5.00e-01m

DOI:10.1364/OL.420716

Funding details: Number: -, Acronym: NSERC, Sponsor: Natural Sciences and Engineering Research Council of Canada;Number: -, Acronym: -, Sponsor: Canada Research Chairs;Number: 62075188, Acronym: NSFC, Sponsor: National Natural Science Foundation of China;Number: ECS-2301818,GRF-11303619, Acronym: UGC, Sponsor: University Grants Committee;Number: XDB24030300, Acronym: CAS, Sponsor: Chinese Academy of Sciences;Number: -, Acronym: RGC, UGC, Sponsor: Research Grants Council, University Grants Committee;Number: LGG21A040003,LY21F050007, Acronym: ZJNSF, Sponsor: Natural Science Foundation of Zhejiang Province;

Funding text:Funding. National Natural Science Foundation of China (62075188); Zhejiang Provincial Natural Science Foundation of China (LGG21A040003, LY21F050007); NSERC Strategic and Discovery Programs, Canada; Canada Research Chair program; Strategic Priority Research Program of the Chinese Academy of Sciences (XDB24030300); Hong Kong Research Grants Council, University Grants Committee (ECS-2301818, GRF-11303619).

Database:Compendex

Open Access type(s): All Open Access, Green

Accession number:20212010348763

Title:Gradient rhenium doping enabled tunable anisotropic valleytronic material based on monolayer molybdenum disulfide

Authors:Ma, Xinli (1); Zhang, Jing (1); Lai, Jiawei (2); Zhang, Mingwen (3); Zheng, Jingchuan (4); Wu, Sen (1); Hu, Xiaodong (1); Wang, Qinsheng (4); Gan, Xuetao (3); Sun, Dong (2); Liu, Jing (1)

Author affiliation:(1) State Key Laboratory of Precision Measurement Technology and Instruments, School of Precision Instruments and Opto-electronics Engineering, Tianjin University, NO. 92 Weijin Road, Tianjin; 300072, China; (2) International Center for Quantum Materials, School of Physics, Peking University, Beijing; 100871, China; (3) MOE Key Laboratory of Space Applied Physics and Chemistry, Shaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University, Xi'an; 710072, China; (4) Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing; 100081, China

Corresponding author:Liu, Jing(jingliu_1112@tju.edu.cn)

Source title:2D Materials

Abbreviated source title:2D Materials

Volume:8

Issue:3

Issue date:July 2021

Publication year:2021

Article number:035031

Language:English

E-ISSN:20531583

Document type:Journal article (JA)

Publisher:IOP Publishing Ltd

Abstract:<div data-language="eng" data-ev-field="abstract">Two-dimensional molybdenum disulfide (MoS2) possesses premium electrical, optoelectrical and valleytronic properties to develop future nano-electronic and optoelectronic devices. Valleytronic material platform with anisotropic response is highly desired to develop polarization sensitive valleytronic devices. In this work, we acquire monolayer MoS2 with both valley degree of freedom and anisotropy by introducing Re doping during chemical vapor deposition growth. The atomic substitution with Re element induces prominent n-type doping. Electrical tests under both dark and light illumination show that 5 at% Re-doped MoS2 achieves the optimum electrical and optoelectrical performances, corresponding to 27 and 35 times improved carrier mobility and photoresponsivity than pristine MoS2, respectively. Second harmonic generation (SHG) and polarization Raman spectroscopy (PRS) indicate increased anisotropic optical response of Re doped MoS2 as Re concentration increases: Maximum anisotropic ratios of 1.6 and 1.7 have been achieved for SHG and PRS measurements at different doping concentrations, respectively. Circularly polarized PL measurement demonstrates that the Re-doped MoS2 preserves valley dependent optical response. Our theoretical calculations show that the anisotropic response is due to the strain induced by the dopants, so that the 2H lattice structure optical helicity dependent valley selection rules are largely preserved. The work opens promising venue toward polarization sensitive valleytronic material platform.<br/></div> © 2021 IOP Publishing Ltd.

Number of references:52

Main heading:Monolayers

Controlled terms:Anisotropy - Chemical vapor deposition - Polarization - Landforms - Degrees of freedom (mechanics) - Molybdenum disulfide - Optical lattices - Optoelectronic devices - Layered semiconductors - Nonlinear optics

Uncontrolled terms:Anisotropic response - Atomic substitutions - Circularly polarized - Doping concentration - Light illumination - Molybdenum disulfide - Polarization sensitive - Theoretical calculations

Classification code:481.1 Geology - 712.1 Semiconducting Materials - 741.1.1 Nonlinear Optics - 741.3 Optical Devices and Systems - 744.8 Laser Beam Interactions - 802.2 Chemical Reactions - 804.2 Inorganic Compounds - 931.1 Mechanics - 931.2 Physical Properties of Gases, Liquids and Solids

DOI:10.1088/2053-1583/abf762

Database:Compendex

Accession number:20211010020180

Title:An Enhanced Tilted-Angle Acoustofluidic Chip for Cancer Cell Manipulation (Open Access)

Authors:Wu, Fangda (1); Shen, Ming Hong (2); Yang, Jian (3); Wang, Hanlin (4); Mikhaylov, Roman (5); Clayton, Aled (6); Qin, Xinghua (7); Sun, Chao (8); Xie, Zhihua (9); Cai, Meng (1); Wei, Jun (1); Liang, Dongfang (2); Yuan, Fan (3); Wu, Zhenlin (4); Fu, Yongqing (5); Yang, Zhiyong (6); Sun, Xianfang (7); Tian, Liangfei (8); Yang, Xin (1)

Author affiliation:(1) Department of Electrical and Electronic Engineering, School of Engineering, Cardiff University, Cardiff, United Kingdom; (2) Division of Cancer and Genetics, Preclinical Studies of Renal Tumours Group, School of Medicine, Cardiff University, Cardiff, United Kingdom; (3) School of Life Sciences, Northwestern Polytechnical University, Xi'an, China; (4) IRegene Therapeutics Company Ltd., Wuhan, China; (5) Department of Biomedical Engineering, School of Engineering, Duke University, Durham; NC, United States; (6) School of Optoelectronic Engineering and Instrumentation Science, Dalian University of Technology, Dalian, China; (7) Faculty of Engineering and Environment, Northumbria University, Newcastle Upon Tyne, United Kingdom; (8) School of Mechanical Engineering, Tianjin University, Tianjin, China; (9) College of Biomedical Engineering and Instrument Science, Zhejiang University, Hangzhou, China

Corresponding author:Yang, Xin(yangx26@cardiff.ac.uk)

Source title:IEEE Electron Device Letters

Abbreviated source title:IEEE Electron Device Lett

Volume:42

Issue:4

Issue date:April 2021

Publication year:2021

Pages:577-580

Article number:9363916

Language:English

ISSN:07413106

E-ISSN:15580563

CODEN:EDLEDZ

Document type:Journal article (JA)

Publisher:Institute of Electrical and Electronics Engineers Inc.

Abstract:In recent years, surface acoustic wave (SAW) devices have demonstrated great potentials and increasing applications in the manipulation of nano- and micro-particles including biological cells with the advantages of label-free, high sensitivity and accuracy. In this letter, we introduce a novel tilted-angle SAW devices to optimise the acoustic pressure inside a microchannel for cancer-cell manipulation. The SAW generation and acoustic radiation force are improved by seamlessly patterning electrodes in the space surrounding the microchannel. Comparisons between this novel SAW device and a conventional device show a 32% enhanced separation efficiency while the input power, manufacturing cost and fabrication effort remain the same. Effective separation of HeLa cancer cells from peripheral blood mononuclear cells is demonstrated. This novel SAW device has the advantages in minimizing device power consumption, lowering component footprint and increasing device density.<br/> © 1980-2012 IEEE.

Number of references:19

Main heading:Cancer cells

Controlled terms:Lanthanum compounds - Molecular biology - Separation - Acoustic surface wave devices - Microchannels - Diseases - Acoustic waves

Uncontrolled terms:Acoustic pressures - Acoustic radiation force - Biological cells - Manufacturing cost - Patterning electrodes - Peripheral blood mononuclear cells - Separation efficiency - Surface acoustic waves

Classification code:461.6 Medicine and Pharmacology - 461.9 Biology - 751.1 Acoustic Waves - 752.1 Acoustic Devices - 802.3 Chemical Operations

Numerical data indexing:Percentage 3.20e+01%

DOI:10.1109/LED.2021.3062292

Database:Compendex

Open Access type(s): All Open Access, Green

Accession number:20212210446530

Title:China’s Mars Exploration Mission and Science Investigation (Open Access)

Authors:Li, Chunlai (1, 2); Zhang, Rongqiao (3); Yu, Dengyun (4); Dong, Guangliang (5); Liu, Jianjun (1, 2); Geng, Yan (3); Sun, Zezhou (6); Yan, Wei (1); Ren, Xin (1); Su, Yan (1, 2); Zuo, Wei (1, 2); Zhang, Tielong (7, 8); Cao, Jinbin (9); Fang, Guangyou (10); Yang, Jianfeng (11); Shu, Rong (12); Lin, Yangting (13); Zou, Yongliao (14); Liu, Dawei (1); Liu, Bin (1); Kong, Deqing (1); Zhu, Xinying (1); Ouyang, Ziyuan (1, 15)

Author affiliation:(1) Key Laboratory of Lunar and Deep Space Exploration, National Astronomical Observatories, Chinese Academy of Sciences, Beijing; 100101, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Lunar Exploration and Space Engineering Center, Beijing; 100190, China; (4) China Aerospace Science and Technology Corporation, Beijing; 100048, China; (5) Beijing Institute of Tracking and Telecommunications Technology, Beijing; 100094, China; (6) Beijing Institute of Spacecraft System Engineering, Beijing; 100094, China; (7) University of Science and Technology of China, Hefei; 230026, China; (8) Space Research Institute, Austrian Academy of Sciences, Graz, Austria; (9) Beihang University, Beijing; 100191, China; (10) Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing; 100190, China; (11) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (12) Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai; 200083, China; (13) Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing; 100029, China; (14) State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing; 100190, China; (15) Institute of Geochemistry, Chinese Academy of Sciences, Guiyang; 550081, China

Corresponding authors:Li, Chunlai(licl@nao.cas.cn); Liu, Jianjun(liujj@nao.cas.cn)

Source title:Space Science Reviews

Abbreviated source title:Space Sci Rev

Volume:217

Issue:4

Issue date:June 2021

Publication year:2021

Article number:57

Language:English

ISSN:00386308

E-ISSN:15729672

CODEN:SPSRA4

Document type:Journal article (JA)

Publisher:Springer Science and Business Media B.V.

Abstract:<div data-language="eng" data-ev-field="abstract">China’s first Mars exploration mission (HuoXing-1) has been named as ‘Tianwen-1’ meaning Heaven Inquiry. Tianwen-1 was launched on July 23, 2020. In this paper, the scientific objectives of earlier and current Mars exploration missions worldwide are reviewed, and the scientific objectives, payloads and preliminary scientific investigation plan of China’s first Mars exploration mission are introduced, and expected scientific achievements are analyzed.<br/></div> © 2021, The Author(s).

Number of references:38

Main heading:Remote sensing

Controlled terms:Martian surface analysis

Uncontrolled terms:Mars exploration - Scientific achievements - Scientific investigation - Scientific objectives

Classification code:657.2 Extraterrestrial Physics and Stellar Phenomena

DOI:10.1007/s11214-021-00832-9

Database:Compendex

Open Access type(s): All Open Access, Hybrid Gold