2024

• Record 337 of
  
  Title:Optical force on a Rayleigh particle generated by photonic jet
  
  Author Full Names:Wei, Bojian; Chen, Run; Xu, Qiang; Li, Renxian; Gong, Shuhong; Yan, Shaohui

  Source Title:OPTICAL REVIEW

  Language:English

  Document Type:Article

  Keywords Plus:DISCRETE-DIPOLE APPROXIMATION; RADIATION FORCES; SCATTERING; NANOPARTICLES; NANOJETS; CYLINDERS; SPHERE; BEAMS; ARRAY

  Abstract:The optical force exerted on a Rayleigh dielectric spherical particle by a photonic jet is investigated in the framework of the Rayleigh approximation. The photonic jet is generated by a plane wave illuminating a Generalized Luneburg Lens (GLLs). The electric field of the photonic jet is calculated using Discrete Dipole Approximation (DDA). The effects of wavelength of incident plane wave, focal length and radius of the GLLs on optical force are analyzed. Numerical results show that the stability of the captured particles can be controlled by changing the incident wavelength, focal length and radius of the GLLs.

  Addresses:[Wei, Bojian; Chen, Run; Xu, Qiang; Li, Renxian; Gong, Shuhong] Xidian Univ, Sch Phys, Xian 710071, Peoples R China; [Yan, Shaohui] Chinese Acad Sci, State Key Lab Transient Opt & Photon, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R China

  Affiliations:Xidian University; State Key Laboratory of Transient Optics & Photonics; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS

  Publication Year:2024

  Volume:31

  Issue:1

  Start Page:41

  End Page:53

  DOI Link:http://dx.doi.org/10.1007/s10043-023-00857-1

  数据库ID（收录号）:WOS:001142987800001
• Record 338 of
  
  Title:High repetition frequency tunability active Q-switched all-fiber laser by multi-gain sub-rings smoothing multipeak pulse and suppressing ASE self-saturation
  
  Author Full Names:Chen, Xuechun; Wang, Nan; He, Chaojian; Xu, Shuang; Ning, Chaoyu; Li, Xinyao; Dong, Zhiyong; Yang, Yingying; Yang, Guowen; Lin, Xuechun

  Source Title:OPTICS EXPRESS

  Language:English

  Document Type:Article

  Keywords Plus:POWER

  Abstract:This paper provides a method to effectively suppress the severe ASE self-saturation when achieving high repetition frequency tunability with high output power and narrow pulse width in active Q-switched all -fiber lasers. By studying the regularity of the system's multi-stable state, we first ensured that the laser system operated in a steady state. Then output avoids uneven distribution of pulse energy or missing pulses due to period bifurcation state or chaos state. By adding multiple gain sub -rings within the cavity, the sub -ring structure itself indirectly mitigates the ASE self-saturation while smoothing the pulse. The method will avoid the severe power loss caused by traditional smoothing methods by adjusting the AOM rising edge time. It will also avoid lowering the ASE lasing threshold at high repetition frequency. Meanwhile, the intra-cavity backward ASE can be effectively absorbed by inserting the gain fiber in the sub -rings to directly mitigate the ASE self-saturation. The system's continuously adjustable repetition frequency can be as high as over 300 kHz. It ensures that output power above the watt level and a < 0.2 nm narrow bandwidth can be maintained while tuning the repetition frequency. The narrowest smoothing pulse width of 28 ns has been reached.

  Addresses:[Chen, Xuechun; Wang, Nan] Chinese Acad Sci, Xian Inst Opt & Precis Mech, State Key Lab Transient Opt & Photon, Xian 710119, Peoples R China; [Chen, Xuechun; Wang, Nan; He, Chaojian; Xu, Shuang; Ning, Chaoyu; Li, Xinyao; Dong, Zhiyong; Yang, Yingying; Lin, Xuechun] Chinese Acad Sci, Lab All Solid State Light Sources, Inst Semicond, Beijing 100083, Peoples R China; [Chen, Xuechun; Wang, Nan; He, Chaojian; Xu, Shuang; Ning, Chaoyu; Li, Xinyao; Dong, Zhiyong; Yang, Yingying; Lin, Xuechun] Engn Technol Res Ctr All Solid State Lasers Adv Mf, Beijing 100083, Peoples R China; [Chen, Xuechun; Wang, Nan; Xu, Shuang; Ning, Chaoyu; Li, Xinyao; Lin, Xuechun] Univ Chinese Acad Sci, Coll Mat Sci & Optoelect Technol, Beijing 101407, Peoples R China

  Affiliations:Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; State Key Laboratory of Transient Optics & Photonics; Chinese Academy of Sciences; Institute of Semiconductors, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS

  Publication Year:2024

  Volume:32

  Issue:2

  Start Page:2124

  End Page:2131

  DOI Link:http://dx.doi.org/10.1364/OE.515391

  数据库ID（收录号）:WOS:001172100600001
• Record 339 of
  
  Title:Single line of sight frame camera based on the RadOptic effect of ultrafast semiconductor detector
  
  Author Full Names:Liu, Yiheng; He, Kai; Yan, Xin; Gao, Guilong; Du, Wanyi; Shang, Yang; Wang, Gang; Wang, Tao; Zhang, Jun; Tian, Jinshou; Tan, Xiaobo

  Source Title:OPTICS AND LASERS IN ENGINEERING

  Language:English

  Document Type:Article

  Keywords Plus:PHOTOGRAPHY; DYNAMICS; FUSION

  Abstract:A new optical beam splitting method is proposed, based on which the optical frame camera capable of capturing multiple frames in a single exposure is designed and experimentally verified. The operation of the frame camera is based on an ultra-fast response semiconductor detector. It is equipped with an optical beam splitter and an optical imaging module. The ultrafast semiconductor detector receives an optical pulse that produces a transient refractive index change, and ultrafast physical processes are recorded by diffracting the probe laser through the transient phase grating. The interaction of an X-ray pulse with a semiconductor detector to produce a phase grating is simulated, based on the Monte Carlo method. The optical beam splitting mode separates a laser into two optical pulses with a certain time difference in the direction of polarization perpendicular to each other. The imaging module filters the diffracted probe laser in the spectral plane and then images multiple frames. The frame camera was used to record the temporal and spatial distribution characteristics of femtosecond laser pulses with a temporal resolution of 4.1 ps. This frame camera has great potential and value for applying to experimental studies of inertial confinement fusion.

  Addresses:[Liu, Yiheng; He, Kai; Yan, Xin; Gao, Guilong; Du, Wanyi; Shang, Yang; Wang, Gang; Wang, Tao; Tian, Jinshou] Chinese Acad Sci, Key Lab Ultrafast Photoelect Diagnost Technol, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R China; [Liu, Yiheng] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Liu, Yiheng; Tian, Jinshou] Shanxi Univ, Collaborat Innovat Ctr Extreme Opt, Taiyuan 030006, Peoples R China; [Zhang, Jun; Tan, Xiaobo] Natl Univ Def Technol, Coll Elect Sci, Changsha 410073, Hunan, Peoples R China

  Affiliations:Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Shanxi University; National University of Defense Technology - China

  Publication Year:2024

  Volume:175

  Article Number:108029

  DOI Link:http://dx.doi.org/10.1016/j.optlaseng.2024.108029

  数据库ID（收录号）:WOS:001165344700001
• Record 340 of
  
  Title:Enantioselective Optical Trapping of Multiple Pairs of Enantiomers by Focused Hybrid Polarized Beams
  
  Author Full Names:Zhang, Yanan; Li, Manman; Yan, Shaohui; Zhou, Yuan; Gao, Wenyu; Niu, Ruixin; Xu, Xiaohao; Yao, Baoli

  Source Title:SMALL

  Language:English

  Document Type:Article

  Keywords Plus:CHIRAL NANOPARTICLES; FORCE; PARTICLES; SPIN; WAVE

  Abstract:Enantiomers (opposite chiral molecules) usually exhibit different effects when interacting with chiral agents, thus the identification and separation of enantiomers are of importance in pharmaceuticals and agrochemicals. Here an optical approach is proposed to enantioselective trapping of multiple pairs of enantiomers by a focused hybrid polarized beam. Numerical results indicate that such a focused beam shows multiple local optical chirality of opposite signs in the focal plane, and can trap the corresponding enantiomers near the extreme value of optical chirality density according to the handedness of enantiomers. The number and positions of trapped enantiomers can be changed by altering the value and sign of polarization orders of hybrid polarized beams, respectively. The key to realizing enantioselective optical trapping of enantiomers is that the chiral optical force exerted on enantiomers in this focused field is stronger than the achiral optical force. The results provide insight into the optical identification and separation of multiple pairs of enantiomers and will find applications in chiral detection and sensing. This work proposes an optical approach to enantioselective trapping of multiple pairs of nano-enantiomers (S and R) by a type of hybrid polarized beams. The enantiomers with opposite chirality can be trapped at different positions depending on whether the handedness of enantiomer matches the sign of optical chiral density at the trapping positions (P1-P6).image

  Addresses:[Zhang, Yanan; Li, Manman; Yan, Shaohui; Zhou, Yuan; Gao, Wenyu; Niu, Ruixin; Xu, Xiaohao; Yao, Baoli] Chinese Acad Sci, State Key Lab Transient Opt & Photon, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R China; [Zhang, Yanan; Zhou, Yuan; Gao, Wenyu; Niu, Ruixin; Yao, Baoli] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

  Affiliations:Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; State Key Laboratory of Transient Optics & Photonics; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS

  Publication Year:2024

  Volume:20

  Issue:25

  DOI Link:http://dx.doi.org/10.1002/smll.202309395

  数据库ID（收录号）:WOS:001138346500001
• Record 341 of
  
  Title:Material removal and surface generation mechanisms in rotary ultrasonic vibration-assisted aspheric grinding of glass ceramics
  
  Author Full Names:Sun, Guoyan; Wang, Sheng; Zhao, Qingliang; Ji, Xiabin; Ding, Jiaoteng

  Source Title:INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY

  Language:English

  Document Type:Article

  Keywords Plus:BRITTLE-DUCTILE TRANSITION; FORCE; MODEL; HARD

  Abstract:High-efficiency precision grinding can shorten the machining cycle of aspheric optical elements by a factor of 2-10. To achieve this objective, ultrasonic vibration (UV)-assisted grinding (UVG) has been increasingly applied to manufacture aspheric optics. However, the mechanisms of material removal and surface formation in UV-assisted aspheric grinding of glass ceramics have rarely been studied. Herein, rotary UV-assisted vertical grinding (RUVG) was used to explore the machining mechanism of coaxial curved surfaces. First, RUV-assisted scratch experiments were conducted on aspheric surface of glass ceramics, which exhibited multiple benefits over conventional scratching. These include a reduction in the scratch force by 37.83-44.55% for tangential component and 3.87-28.15% for normal component, an increase in plastic removal length by 43.75%, and an increase in material removal rate by almost a factor of 2. Moreover, grinding marks on the aspheric surface in RUVG were accurately simulated and optimized by adjusting grinding parameters. RUVG experiments were performed to verify the accuracy of grinding texture simulations and investigate the UV effect. The results demonstrate that UV can improve the surface quality of aspheric grinding when compared with conventional vertical grinding. In particular, the total height of the profile of form accuracy and its root mean square were significantly improved by a factor of 3.38-4.54 and 7.15-10.82, respectively, and the surface roughness reduced by 10.03-12.10%. This study provides deeper insight into material removal and surface generation mechanisms for RUVG of aspheric surfaces, and it is thus envisaged that these results will be useful in engineering applications.

  Addresses:[Sun, Guoyan; Ji, Xiabin; Ding, Jiaoteng] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R China; [Sun, Guoyan] Natl Univ Def Technol, Coll Artificial Intelligence, Changsha 410003, Peoples R China; [Wang, Sheng; Zhao, Qingliang] Harbin Inst Technol, Ctr Precis Engn, Sch Mechatron Engn, Harbin 150001, Peoples R China

  Affiliations:Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; National University of Defense Technology - China; Harbin Institute of Technology

  Publication Year:2024

  Volume:130

  Issue:7-8

  Start Page:3721

  End Page:3740

  DOI Link:http://dx.doi.org/10.1007/s00170-023-12904-x

  数据库ID（收录号）:WOS:001137647200003
• Record 342 of
  
  Title:Two-dimensional numerical simulation of pre-ionized direct-current glow discharge in atmospheric helium
  
  Author Full Names:Liu Zai-Hao; Liu Ying-Hua; Xu Bo-Ping; Yin Pei-Qi; Li Jing; Wang Yi-Shan; Zhao Wei; Duan Yi-Xiang; Tang Jie

  Source Title:ACTA PHYSICA SINICA

  Language:Chinese

  Document Type:Article

  Keywords Plus:PRESSURE

  Abstract:In this paper, the effect of pre-ionization on the small-gap and large-gap direct-current glow discharge at atmospheric pressure are investigated based on a two-dimensional self-consistent fluid model. For both the discharges, the results show that with the enhancement of pre-ionization, the charged particle distribution gradually shifts toward the cathode along the discharge direction, making the cathode fall zone shrink continuously. The width of the positive column region, negative glow space, and cathode fall zone continuously extend along the vertical discharge direction, and the distribution of electron density and ion density are more uniform. For the electric field, with the enhancement of pre-ionization, the longitudinalal component distribution of the electric field in the cathode fall zone gradually contracts toward the cathode, and the overall electric field near the cathode decreases and becomes more uniformly distributed. The transverse component distribution of the electric field gradually decreases and shrinks toward the wall. The overall electron temperature in the discharge space decreases with the enhancement of the pre-ionization level, and the electron temperature distribution in the cathode fall zone gradually shrinks toward the cathode. In addition, the overall potential of the discharge space also decreases. The introduction of pre-ionization significantly reduces the maintaining voltage and discharge power of the direct-current glow discharge. Furthermore, the potential drop in the small-gap discharge is always concentrated in the cathode fall zone as the pre-ionization increases, while the potential drop in the large-gap discharge is gradually shifted from the cathode fall zone to the positive column region. This simulation shows that the pre-ionization not only effectively enhances the discharge uniformity, but also largely reduces the maintaining voltage and energy consumption of the direct-current glow discharge. This work is an important guideline for further optimizing the electrode configuration and the operating parameters of the plasma source.

  Addresses:[Liu Zai-Hao; Liu Ying-Hua; Xu Bo-Ping; Yin Pei-Qi; Wang Yi-Shan; Zhao Wei; Tang Jie] Chinese Acad Sci, State Key Lab Transient Opt & Photon, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R China; [Liu Zai-Hao; Liu Ying-Hua; Xu Bo-Ping; Yin Pei-Qi; Wang Yi-Shan; Zhao Wei; Tang Jie] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Li Jing] Huaiyin Inst Technol, Fac Math & Phys, Huaian 223003, Peoples R China; [Duan Yi-Xiang] Sichuan Univ, Sch Mech Engn, Res Ctr Analyt Instrumentat, Chengdu 610064, Peoples R China

  Affiliations:Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; State Key Laboratory of Transient Optics & Photonics; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Huaiyin Institute of Technology; Sichuan University

  Publication Year:2024

  Volume:73

  Issue:1

  Article Number:15101

  DOI Link:http://dx.doi.org/10.7498/aps.73.20230712

  数据库ID（收录号）:WOS:001265094200001
• Record 343 of
  
  Title:Spectroscopic properties and numerical analysis of novel erbium doped multi-component tellurite glasses
  
  Author Full Names:Wan, Rui; Guo, Chen; Li, Xianda; Wang, Pengfei

  Source Title:CERAMICS INTERNATIONAL

  Language:English

  Document Type:Article

  Keywords Plus:2.7 MU-M; NONLINEAR-OPTICAL PROPERTIES; ABSORPTION INTENSITIES; HYDROXYL-GROUPS; M EMISSION; ER3+; LASER; TRANSITION; B2O3

  Abstract:In this paper, Er3+ doped TeO2-ZnF2-BaF2-KF-Ta2O5 tellurite glasses with low hydroxyl content (-0.03 x 10-19 cm- 3) were investigated employing both glass composition and glass melting process optimization. The Raman spectra and physical properties were characterized to analyze the structure of the glasses. Under the pumping of 980 nm LD laser, intense up-conversion fluorescence at 1.5 and 2.7 mu m of samples and their lifetimes were detected and analyzed, and the related transition mechanisms with gradient-varying Er3+ doping concentrations were discussed. The maximum absorption and emission cross section at 2.7 mu m was calculated to be 6.4 x 10-21 cm2 and 6.8 x 10-21 cm2, correspondingly, which were higher than those of traditional tellurite glasses. Using the calculated and measured spectroscopic parameters of bulk tellurite glass, a dual-wavelength pumping model was established to verify the feasibility of mid-infrared laser output in similar tellurite glass fiber. Experimental results support the assertion that the Er3+ doped tellurite glasses hold promise as a candidate laser gain medium for mid-infrared fiber laser systems.

  Addresses:[Wan, Rui; Guo, Chen; Li, Xianda; Wang, Pengfei] Chinese Acad Sci, Xian Inst Opt & Precis Mech, State Key Lab Transient Opt & Photon, Xian 710119, Shaanxi, Peoples R China; [Wan, Rui; Guo, Chen; Li, Xianda; Wang, Pengfei] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China

  Affiliations:Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; State Key Laboratory of Transient Optics & Photonics; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS

  Publication Year:2024

  Volume:50

  Issue:4

  Start Page:7168

  End Page:7176

  DOI Link:http://dx.doi.org/10.1016/j.ceramint.2023.12.085

  数据库ID（收录号）:WOS:001152758600001
• Record 344 of
  
  Title:O-band reconfigurable silicon polarization rotator
  
  Author Full Names:Bai, Yawen; Wang, Pengfei; Peng, Bo; Chu, Tao

  Source Title:CHINESE OPTICS LETTERS

  Language:English

  Document Type:Article

  Keywords Plus:ULTRA-BROAD-BAND; BEAM SPLITTER; WAVE-GUIDE

  Abstract:Silicon waveguides typically exhibit optical anisotropy, which leads to polarization correlation and single-polarization operations. This consequently creates a demand for polarization-control devices. This paper introduces a CMOS-compatible O-band reconfigurable TE/TM polarization rotator comprising two symmetrical polarization rotator-splitters and phase shifters. This configuration enables dynamic conversion of any linear polarization to its quadratic equivalent. Experimental results indicate that the reconfigurable polarization rotator exhibits an insertion loss of less than 1.5 dB. Furthermore, the bandwidth for a polarization extinction ratio beyond 15 dB exceeds 60 nm.

  Addresses:[Bai, Yawen; Wang, Pengfei; Peng, Bo] Chinese Acad Sci, Xian Inst Opt & Precis Mech, State Key Lab Transient Opt & Photon, Xian 710119, Peoples R China; [Bai, Yawen; Wang, Pengfei; Peng, Bo] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China; [Chu, Tao] Zhejiang Univ, Coll Informat Sci & Elect Engn, Hangzhou 310027, Peoples R China

  Affiliations:State Key Laboratory of Transient Optics & Photonics; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Zhejiang University

  Publication Year:2024

  Volume:22

  Issue:1

  Article Number:11303

  DOI Link:http://dx.doi.org/10.3788/COL202422.011303

  数据库ID（收录号）:WOS:001207555300012
• Record 345 of
  
  Title:Compressed Spectrum Reconstruction Method Based on Coding Feature Vector Enhancement
  
  Author Full Names:Cao, Chipeng; Li, Jie; Wang, Pan; Qi, Chun

  Source Title:IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING

  Language:English

  Document Type:Article

  Keywords Plus:SIGNALS; DESIGN; TENSOR

  Abstract:Compressive spectral imaging (CSI) is a snapshot spectral imaging technique that rapidly captures the spectral information of a target in a single exposure and effectively reconstructs high spectral data using reconstruction algorithms. However, due to the presence of a large number of identical pixels in the measured image, which map to different prior spectral information, existing algorithms struggle to establish an accurate pixel separation representation model. To improve the separation effect between pixels and enhance the representation capability of the measured image pixels, we propose a compressed spectral reconstruction method with enhanced encoding feature vectors. By designing encoding information calculation rules based on a combination of linear and nonlinear functions, encoding features are calculated according to the spatial coordinate position information and wavelength information of the pixels, effectively enhancing the separation representation characteristics between channels and neighboring pixels through the addition of encoding features. Furthermore, by utilizing the semantic similarity between the predicted results of the prior model and the prior spectral image, the reconstruction problem is transformed into a total variation (TV) minimization problem between the predicted results of the prior model and the reconstruction results, combined with the alternating direction method of multipliers (ADMMs) to achieve accurate pixel reconstruction. The experimental setup utilizes a dual-camera compressed spectral imaging (DCCHI) system, consisting of a dual-dispersion coded aperture compressed spectral imaging (DD-CASSI) system and a grayscale imaging system. Various experiments have shown that the proposed method outperforms in reconstructing quality and displays superior algorithmic performance.

  Addresses:[Cao, Chipeng; Li, Jie; Wang, Pan; Qi, Chun] Xi An Jiao Tong Univ, Sch Informat & Commun Engn, Xian 710049, Shaanxi, Peoples R China; [Cao, Chipeng] Univ Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian 710049, Shaanxi, Peoples R China

  Affiliations:Xi'an Jiaotong University; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; University of Chinese Academy of Sciences, CAS

  Publication Year:2024

  Volume:62

  Article Number:5503016

  DOI Link:http://dx.doi.org/10.1109/TGRS.2023.3347220

  数据库ID（收录号）:WOS:001141862700021
• Record 346 of
  
  Title:Fractional Fourier-Based Frequency-Spatial-Spectral Prototype Network for Agricultural Hyperspectral Image Open-Set Classification
  
  Author Full Names:Chen, Maoyang; Feng, Shou; Zhao, Chunhui; Qu, Bo; Su, Nan; Li, Wei; Tao, Ran

  Source Title:IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING

  Language:English

  Document Type:Article

  Abstract:At present, hyperspectral image classification (HSIC) technology has been warmly concerned in all walks of life, especially in agriculture. However, existing classification methods operate under the closed-set assumption, which deviates from the real world with open properties. At the same time, there are more serious phenomena of different crops with similar spectrums and the same crops with different spectrum in agricultural hyperspectral data, which is also a great challenge to existing methods. In this work, a fractional Fourier-based frequency-spatial-spectral prototype network (FrFSSPN) is proposed to address the challenges of open-set HSIC in agricultural scenarios. First, fractional Fourier transform (FrFT) is introduced into the network to combine the information in the frequency domain with the spatial-spectral information, so as to expand the difference between different classes on the premise of ensuring the similarity between classes. Then, the prototype learning strategy is introduced into the network to improve the feature recognition capability of the network through prototype loss. Finally, in order to break the stubbornly closed-set property of the closed-set classification (CSC) method, the open-set recognition module is proposed. The difference between the prototype vector and the feature vector is used to judge the unknown class. Experiments on three agricultural hyperspectral datasets show that this method can effectively identify unknown classes without sacrificing the classification accuracy of closed-set, and has satisfactory classification performance.

  Addresses:[Chen, Maoyang; Feng, Shou; Zhao, Chunhui; Su, Nan] Harbin Engn Univ, Coll Informat & Commun Engn, Harbin 150001, Peoples R China; [Chen, Maoyang; Feng, Shou; Zhao, Chunhui; Su, Nan] Harbin Engn Univ, Key Lab Adv Marine Commun & Informat Technol, Minist Ind & Informat Technol, Harbin 150001, Peoples R China; [Chen, Maoyang; Feng, Shou; Qu, Bo] Shaanxi Key Lab Opt Remote Sensing & Intelligent I, Xian 710119, Peoples R China; [Feng, Shou] Beijing Inst Technol, Sch Informat & Elect, Beijing 100081, Peoples R China; [Qu, Bo] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Key Lab Spectral Imaging Technol CAS, Xian 710119, Shaanxi, Peoples R China; [Qu, Bo] Xi An Jiao Tong Univ, Key Lab Intelligent Networks & Network Secur, Minist Educ, Xian 710049, Peoples R China; [Li, Wei; Tao, Ran] Beijing Inst Technol, Sch Informat & Elect, Beijing 100081, Peoples R China

  Affiliations:Harbin Engineering University; Harbin Engineering University; Beijing Institute of Technology; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; Xi'an Jiaotong University; Beijing Institute of Technology

  Publication Year:2024

  Volume:62

  Article Number:5514014

  DOI Link:http://dx.doi.org/10.1109/TGRS.2024.3386566

  数据库ID（收录号）:WOS:001205148500026
• Record 347 of
  
  Title:Fast and Robust Restoration of Single Photon 3D Data Using Parameterized Kernel
  
  Author Full Names:Chen, Songmao; Su, Xiuqin; Zhang, Zhenyang; Xu, Weihao; Wang, Jie; Hao, Wei

  Source Title:IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS

  Language:English

  Document Type:Article

  Keywords Plus:LIDAR; RECONSTRUCTION

  Abstract:Single photon 3D imaging is an emerging topic for optronic sensing under extreme scenarios (e.g. spaceborne altimeter, long range imaging). However, such technique suffers from low photon counts and strong noise, which is due to either strong attenuation from the environment or reduced acquisition time. Although state-of-the-art algorithms have been proposed to achieve high resolution results from corrupted single photon 3D data, the trade-off between the restoration performance and computational complexity remains challenging. This paper presents a fast and robust restoration approach for single photon 3D data, which adaptively smooth the sparse and noisy histogram by applying a parameterized kernel and finally reconstruct the 3D image using matched filter. The implementation can be fast as the core step of the processing is generalized as a 3D convolution that can be solved by Fast Fourier Transform (FFT). The method is validated on various conditions and scenarios from Middbury dataset and real data, where the proposed method showed robust results as the competing state-of-the-art algorithms with fast implementation.

  Addresses:[Chen, Songmao; Su, Xiuqin; Zhang, Zhenyang; Xu, Weihao; Wang, Jie; Hao, Wei] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Key Lab Space Precis Measurement Technol, Xian 710119, Peoples R China; [Chen, Songmao; Su, Xiuqin; Zhang, Zhenyang; Wang, Jie; Hao, Wei] Pilot Natl Lab Marine Sci & Technol, Qingdao 266200, Peoples R China; [Zhang, Zhenyang; Xu, Weihao; Wang, Jie] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

  Affiliations:Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; Laoshan Laboratory; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS

  Publication Year:2024

  Volume:30

  Issue:1

  Article Number:9900008

  DOI Link:http://dx.doi.org/10.1109/JSTQE.2023.3269747

  数据库ID（收录号）:WOS:001179580200010
• Record 348 of
  
  Title:Multi-Grained and Confidence-Aware Multiple Instance Network for Infrared Target Detection
  
  Author Full Names:Chen, Weining; Yang, Hongtao; Chang, Sansan; Chen, Yunzhi; Wang, Xinlin; Chen, Yaohong

  Source Title:IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING

  Language:English

  Document Type:Article

  Abstract:Weakly supervised object detection (WSOD) methods that trains an object detection network using image-level labels has attracted much attention due to its cost-effective annotation and broad applied requirement. However, applying such weak label to detect targets in infrared images is not trivial due to the less discriminative target information and interference of complex backgrounds. This article proposes a multi-grained and confidence-aware multiple instance network (MCMIN) to detect infrared targets given the imprecise labels. The multiscale multi-grained feature extraction module is designed to capture discriminative features from different receptive fields for dim-small targets. The hierarchical multiple instance target detection module first applies L1-sparsity regularization to encourage the model generate reliable pseudo ground truth (GT), and then leverages the confidence-aware instance adaptive weighting strategy to refine proposals with particular emphasis, achieving more accurate target detection. The experimental results on two infrared target detection datasets illustrate that the proposed MCMIN outperforms other state-of-the-art WSOD methods with higher average precision (AP). The proposed approach decreases the false alarms.

  Addresses:[Chen, Weining] Northwestern Polytech Univ, Sch Automat, Xian 710129, Peoples R China; [Chen, Weining; Yang, Hongtao; Chang, Sansan; Chen, Yaohong] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R China; [Chen, Weining; Chang, Sansan; Chen, Yaohong] Key Lab Spacecraft Opt Imaging & Measurement Techn, Xian 710119, Peoples R China; [Chen, Yunzhi] Hangzhou Vocat & Tech Coll, Sch Elect Informat Engn, Hangzhou 310018, Peoples R China; [Wang, Xinlin] Xidian Univ, Sch Artificial Intelligence, Key Lab Intelligent Percept & Image Understanding, Minist Educ, Xian 710071, Peoples R China

  Affiliations:Northwestern Polytechnical University; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; Hangzhou Vocational & Technical College; Xidian University

  Publication Year:2024

  Volume:62

  Article Number:5005113

  DOI Link:http://dx.doi.org/10.1109/TGRS.2024.3422924

  数据库ID（收录号）:WOS:001276870500026