2024

• Record 25 of
  
  Title:A review of liquid metal-based flexible electronics achieved by ultrafast lasers
  
  Author Full Names:Zhang, Jingzhou; Yang, Qing; Zhang, Chengjun; Li, Haoyu; Zhao, Hualong; Chen, Feng

  Source Title:APPLIED MATERIALS TODAY

  Language:English

  Document Type:Article

  Keywords Plus:NANOSECOND LASER; SURFACE; FEMTOSECOND; FABRICATION; SOFT; MICROCHANNELS; CONDUCTORS; ELASTOMER; ABLATION; DROPLETS

  Abstract:Gallium and its alloys are room temperature liquid metals, which exhibit both the fluidity of liquid and the conductivity of metal. Recently, Gallium-based liquid metals have aroused great attention and played a crucial role in flexible sensors, self-healing circuits, stretchable electrodes, and soft robots. Within these fields, developing advanced printing technology was the key to obtain liquid metal-based electronic devices. Ultrafast laser microfabrication has the characteristics of high precision and low thermal effect. This technology has been successfully applied to prepare various liquid metal patterns and contributed for the development of flexible electronics. In this review, the recent advances of gallium-based flexible electronics by ultrafast lasers are systematically summarized. We mainly focus on the physical and chemical properties of liquid metals, laser-induced liquid metal printing methods, and their typical applications in flexible electronics. Finally, the challenges and personal perspectives of liquid metal-based flexible electronics are briefly discussed.

  Addresses:[Zhang, Jingzhou; Zhao, Hualong] Chinese Acad Sci, Xian Inst Opt & Precis Mech, State Key Lab Transient Opt & Photon, Xian 710119, Peoples R China; [Yang, Qing; Zhang, Chengjun] Xi An Jiao Tong Univ, Sch Mech Engn, Xian 710049, Peoples R China; [Li, Haoyu; Chen, Feng] Xi An Jiao Tong Univ, Sch Elect Sci & Engn, State Key Lab Mfg Syst Engn, Xian 710049, Peoples R China; [Li, Haoyu; Chen, Feng] Xi An Jiao Tong Univ, Sch Elect Sci & Engn, Shaanxi Key Lab Photon Technol Informat, Xian 710049, Peoples R China

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

  Publication Year:2024

  Volume:41

  Article Number:102505

  DOI Link:http://dx.doi.org/10.1016/j.apmt.2024.102505

  数据库ID（收录号）:WOS:001355862000001
• Record 26 of
  
  Title:Prediction of optical chaos using a multi-stage extreme learning machine with data uncertainty
  
  Author Full Names:Gao, Dawei; Ma, Chen; Fan, Yuanlong; Wang, Yangyundou; Shao, Xiaopeng

  Source Title:OPTICS EXPRESS

  Language:English

  Document Type:Article

  Keywords Plus:SEMICONDUCTOR-LASERS

  Abstract:In this paper, we study the problem of predicting optical chaos for semiconductor lasers, where data uncertainty can severely degrade the performance of chaos prediction. We hereby propose a multi-stage extreme learning machine (MSELM) based approach for the continuous prediction of optical chaos, which handles data uncertainty effectively. Rather than relying on pilot signals for conventional reservoir learning, the proposed approach enables the use of predicted optical intensity as virtual training samples for the MSELM model learning, which leads to enhanced prediction performance and low overhead. To address the data uncertainty in virtual training, total least square (TLS) is employed for the update of the proposed MSELM's parameters with simple updating rule and low complexity. Simulation results demonstrate that the proposed MSELM can execute the continuous optical chaos predictions effectively. The chaotic time series can be continuously predicted for a time period in excess of 4 ns with a normalized mean squared error (NMSE) lower than 0.012. It also demands much fewer training samples than state-of-the-art learning-based methods. In addition, the simulation results show that with the help of TLS, the length of prediction is improved significantly as the uncertainty is handled properly. Finally, we verify the prediction ability of the multi-stage ELM under various laser parameters, and make the median boxplot of the predicted results, which shows that the proposed MSELM continues to produce accurate and continuous predictions on time-varying optical chaos.

  Addresses:[Gao, Dawei; Ma, Chen; Fan, Yuanlong; Wang, Yangyundou] Xidian Univ, Hangzhou Inst Technol, Hangzhou 311231, Peoples R China; [Ma, Chen; Fan, Yuanlong; Wang, Yangyundou] Xidian Univ, Sch Optoelect Engn, Xian 710071, Peoples R China; [Shao, Xiaopeng] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R China

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

  Publication Year:2024

  Volume:32

  Issue:23

  Start Page:40820

  End Page:40829

  DOI Link:http://dx.doi.org/10.1364/OE.534975

  数据库ID（收录号）:WOS:001355780700002
• Record 27 of
  
  Title:Differentiable design of freeform diffractive optical elements for beam shaping by representing phase distribution using multi-level B-splines
  
  Author Full Names:Liao, Qingming; Wang, Haoqiang; Feng, Zexin; Li, Mengmeng; Luo, Yi; Mao, Xianglong

  Source Title:OPTICS EXPRESS

  Language:English

  Document Type:Article

  Keywords Plus:OPTIMIZATION; ALGORITHM; PROJECTION; SURFACE; IMAGE; LENS

  Abstract:The generation of a specific laser beam profile on the work surface is key to various laser beam shaping tasks, relying heavily on diffractive optical elements (DOEs). Most beamshaping DOEs are designed using iterative Fourier transform algorithms (IFTAs), which generally have slow convergence and prone to stagnate at local minima. Moreover, the microreliefs generated by IFTAs tend to be irregular, complicating manufacturing and causing uncontrolled scattering of light. We propose a differentiable DOE design method that applies a phasesmoothness constraint using multi-level B-splines. A multi-scale gradient-descent optimization strategy, naturally linked with the multi-level B-splines, is employed to robustly determine the optimized phase distribution that is fully continuous. This, in turn, can lead to more regular DOE microreliefs, which can simplify the fabrication process and be less sensitive to changes in wavelength and working distance. Furthermore, our method can also design a fully continuous freeform lens, distinguished from most freeform lens design approaches by its foundation in physical optics rather than geometrical optics. Simulation and experimental results of several design tasks demonstrate the effectiveness of the proposed method.

  Addresses:[Liao, Qingming; Feng, Zexin; Li, Mengmeng] Beijing Inst Technol, Beijing Engn Res Ctr Mixed Real & Adv Display, Sch Opt & Photon, Beijing 100081, Peoples R China; [Liao, Qingming; Feng, Zexin; Li, Mengmeng] Beijing Inst Technol, MOE Key Lab Optoelect Imaging Technol & Syst, Beijing 100081, Peoples R China; [Wang, Haoqiang] Shenzhen Univ, Coll Phys & Optoelect Engn, Shenzhen 518060, Guangdong, Peoples R China; [Luo, Yi] Tsinghua Univ, Beijing Natl Res Ctr Informat Sci & Technol, Dept Elect Engn, Beijing 100084, Peoples R China; [Mao, Xianglong] Chinese Acad Sci, Xian Inst Opt & Precis Mech, New Technol Lab Space Photon Informat, Xian 710119, Shaanxi, Peoples R China

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

  Publication Year:2024

  Volume:32

  Issue:23

  Start Page:41041

  End Page:41056

  DOI Link:http://dx.doi.org/10.1364/OE.533298

  数据库ID（收录号）:WOS:001355784900003
• Record 28 of
  
  Title:Dual-biomimetic curved compound-eye camera system for multi-target distance measurement in a large field of view
  
  Author Full Names:Liu, Yiming; Xu, Huangrong; Zhang, Yuanjie; Wu, Dengshan; Zhou, Xiaojun; Meng, Qingyang; Wang, Yuanyuan; Yu, Weixing

  Source Title:OPTICS EXPRESS

  Language:English

  Document Type:Article

  Keywords Plus:TOMBO

  Abstract:Biomimetic curved compound-eye cameras (BCCECs) have attracted great attention for their potential applications in a variety of fields such as target recognition, monitor and three-dimensional localization in military due to their unique optical properties such as large field of view (FOV) and small size. In this work, we proposed a multi-target distance measurement method based on a dual-BCCEC system in a large FOV. To guarantee the precise measurement of the distance of multiple targets, a feature point searching and matching algorithm is developed for the dual-BCCEC system to improve the localizing efficiency of common feature points. In addition, a CALibration Tag (CALTag) self-recognition calibration method is also developed to calibrate ommatidia of the BCCEC with a high efficiency. Based on these two methods, the coordinates of multiple targets with clear feature points can be obtained after the distortion correction in sub-images and thus the distances of multiple targets with clear feature points can be achieved simultaneously with a single compound-eye raw image. The experiment results show that the dual-BCCEC system has a high distant measurement accuracy with an error of less than 6.80% for at least ten different targets in the a working distance ranging from 400 to 600 m in a quite large FOV of 98 degrees x98 degrees. The method demonstrated in this work can pave the way for multi-targets tracking in those related areas with high security monitoring requirements.

  Addresses:[Liu, Yiming; Xu, Huangrong; Zhang, Yuanjie; Wu, Dengshan; Zhou, Xiaojun; Meng, Qingyang; Yu, Weixing] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Key Lab Spectral Imaging Technol, 17 Xinxi Rd, Xian 710119, Peoples R China; [Liu, Yiming; Zhang, Yuanjie; Yu, Weixing] Univ Chinese Acad Sci, Sch Optoelect, Beijing 100049, Peoples R China; [Wang, Yuanyuan] Northwest A&F Univ, Sch Sci, Yangling 712100, Shaanxi, 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; Northwest A&F University - China

  Publication Year:2024

  Volume:32

  Issue:23

  Start Page:41870

  End Page:41881

  DOI Link:http://dx.doi.org/10.1364/OE.535365

  数据库ID（收录号）:WOS:001355790600003
• Record 29 of
  
  Title:Optimization of a large aperture wedge prism support system based on the closed-loop structural-thermal-optical performance method
  
  Author Full Names:Wen, Wansha; Ruan, Ping; Li, Baopeng; Lv, Tao

  Source Title:OPTICS EXPRESS

  Language:English

  Document Type:Article

  Keywords Plus:DESIGN

  Abstract:In the instrument suite of the Thirty Meter Telescope (TMT), the linear atmospheric dispersion corrector (LADC) is positioned at the forefront of the spectrometer to mitigate atmospheric dispersion. The LADC comprises two large aperture wedge prisms, each approximately 1.5 meters in diameter. These prisms, which are transmissive optical elements, are supported radially along their outer circumferences. However, due to the rotational asymmetry of the prisms relative to the optical axis, the support forces do not align with the plane of the center of gravity, leading to a bending moment caused by gravitational and reaction forces. This misalignment results in significant deformation of the prism surfaces. The structural-thermaloptical performance integrated model method is typically employed to evaluate the impact of the support system on prism surface deformation. This process often involves extensive manual iterations and operates in an open-loop manner, making it inefficient and heavily reliant on the analyst's expertise. To address these limitations, this paper proposes a closed-loop integrated interface programs between analysis tools and applying advanced optimization algorithms, the traditional open-loop integrated model analysis process is transformed into a closed-loop system, enabling more efficient and reliable optimization. The closed-loop integrated model method incorporates Optimal Latin Hypercube Design (Opt LHD) and Particle Swarm Optimization (PSO) algorithms to optimize the prism support structure, reducing the analysis time from one week to just two days. Compared to the original support structure, the root mean square (RMS) value of optical surface deformation decreased by 49.3%, from 155.0 nm to 78.6 nm, under gravity and 2 degrees C temperature coupled conditions; and by 62.5%, from 289. 1 nm to 108. 4 nm, under gravity and 42 degrees C temperature coupled conditions. These results demonstrate that the closed-loop integrated model optimization method not only improves efficiency but also achieves significantly better outcomes.

  Addresses:[Wen, Wansha; Ruan, Ping; Li, Baopeng; Lv, Tao] Chinese Acad Sci, Xian Inst Opt & Precis Mech, 17 Xinxi Rd, Xian 710119, Peoples R China; [Wen, Wansha; Ruan, Ping; Lv, Tao] Chinese Acad Sci, Key Lab Space Precis Measurement Technol, 17 Xinxi Rd, Xian 710119, Peoples R China

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

  Publication Year:2024

  Volume:32

  Issue:23

  Start Page:40453

  End Page:40466

  DOI Link:http://dx.doi.org/10.1364/OE.540266

  数据库ID（收录号）:WOS:001356579200009
• Record 30 of
  
  Title:Calibration and Performance of the Full-Disk Vector MagnetoGraph (FMG) on Board the Advanced Space-Based Solar Observatory (ASO-S)
  
  Author Full Names:Bai, Xianyong; Deng, Yuanyong; Zhang, Haiying; Yang, Jianfeng; Li, Fu; Su, Jiangtao; Liu, Suo; Song, Yongliang; Ji, Kaifan; Huang, Yu; Yang, Xiao; Wang, Dongguang; Lin, Jiaben; Hou, Junfeng; Sun, Yingzi; Duan, Wei; Song, Qian; Bai, Yang; Wang, Xiaofan; Xu, Haiqing; Chen, Jie; Hu, Ziyao; Zheng, Zhaoying; Ni, Houkun; Zeng, Yizhong; Wu, Zhen; Wang, Jianing; Ge, Wei; Lv, Juan; Shen, Lun; Wang, Nange; He, Jiawei; Wang, Chenjie

  Source Title:SOLAR PHYSICS

  Language:English

  Document Type:Article

  Keywords Plus:TELESCOPE

  Abstract:We present the ground calibration and on-orbit performance of the Full-disk vector MagnetoGraph (FMG) payload on board the Advanced Space-Based Solar Observatory (ASO-S), which is China's first spaceborne magnetograph. FMG has the ability to acquire the full-disk Stokes I, Q/I, U/I, and V/I maps with a spatial resolution of about 1.5 arcsec. The Lyot filter for the flight model has a full width at half maximum of 0.01 nm. Using two calibration lenses, we measure the non-uniform wavelength drift across the entire field of view, with a maximum value of 0.003 nm. The on-orbit polarization sensitivity is approximately 0.00039 and 0.0009 for the deep integration and routine modes, corresponding to a cadence of 18 and 2 minutes, respectively. The corresponding sensitivity of the longitudinal magnetic field is 8.5 G and 20 G with the current linear calibration coefficient of 21,913. Since 1 April 2023, FMG has released Level 2 filtergram and longitudinal magnetic field data products for active regions. Furthermore, line-of-sight Carrington synoptic magnetograms spanning a 27-day solar rotation can be generated, which have been released to the public since February 2024. The longitudinal magnetic field obtained by FMG is consistent with that of the Helioseismic and Magnetic Imager on board the Solar Dynamic Observatory and the Solar Magnetism and Activity Telescope at Huairou Solar Observing Station for the regions without magnetic saturation.

  Addresses:[Bai, Xianyong; Deng, Yuanyong; Su, Jiangtao; Liu, Suo; Song, Yongliang; Yang, Xiao; Wang, Dongguang; Lin, Jiaben; Hou, Junfeng; Sun, Yingzi; Duan, Wei; Song, Qian; Bai, Yang; Wang, Xiaofan; Xu, Haiqing; Chen, Jie; Hu, Ziyao] Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China; [Bai, Xianyong; Deng, Yuanyong; Zhang, Haiying; Su, Jiangtao; Hou, Junfeng; Duan, Wei; Hu, Ziyao] Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 101408, Peoples R China; [Bai, Xianyong; Deng, Yuanyong; Su, Jiangtao; Liu, Suo; Song, Yongliang; Yang, Xiao; Wang, Dongguang; Lin, Jiaben; Hou, Junfeng; Sun, Yingzi; Bai, Yang; Wang, Xiaofan; Xu, Haiqing; Chen, Jie; Hu, Ziyao] Chinese Acad Sci, Natl Space Sci Ctr, Key Lab Solar Act & Space Weather, Beijing 100190, Peoples R China; [Zhang, Haiying; Zheng, Zhaoying; Ni, Houkun; Zeng, Yizhong; Wu, Zhen; Wang, Jianing] Chinese Acad Sci, Nanjing Inst Astron Opt & Technol, Nanjing 210042, Peoples R China; [Yang, Jianfeng; Li, Fu; Ge, Wei; Lv, Juan; Shen, Lun; Wang, Nange; He, Jiawei; Wang, Chenjie] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R China; [Ji, Kaifan] Chinese Acad Sci, Yunnan Observ, Kunming 650011, Peoples R China; [Huang, Yu] Chinese Acad Sci, Purple Mt Observ, Nanjing 210013, Peoples R China

  Affiliations:Chinese Academy of Sciences; National Astronomical Observatory, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Chinese Academy of Sciences; National Space Science Center, CAS; Chinese Academy of Sciences; Nanjing Institute of Astronomical Optics & Technology, NAOC, CAS; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; Chinese Academy of Sciences; Yunnan Astronomical Observatory, NAOC, CAS; Purple Mountain Observatory, CAS; Chinese Academy of Sciences; Nanjing Institute of Astronomical Optics & Technology, NAOC, CAS

  Publication Year:2024

  Volume:299

  Issue:11

  Article Number:157

  DOI Link:http://dx.doi.org/10.1007/s11207-024-02400-0

  数据库ID（收录号）:WOS:001354749700001
• Record 31 of
  
  Title:Event-Driven Maximum Correntropy Filter Based on Cauchy Kernel for Spatial Orientation Using Gyros/Star Sensor Integration
  
  Author Full Names:Cui, Kai; Liu, Zhaohui; Han, Junfeng; Ma, Yuke; Liu, Peng; Gao, Bingbing

  Source Title:SENSORS

  Language:English

  Document Type:Article

  Abstract:Gyros/star sensor integration provides a potential method to obtain high-accuracy spatial orientation for turntable structures. However, it is subjected to the problem of accuracy loss when the measurement noises become non-Gaussian due to the complex spatial environment. This paper presents an event-driven maximum correntropy filter based on Cauchy kernel to handle the above problem. In this method, a direct installation mode of gyros/star sensor integration is established and the associated mathematical model is derived to improve the turntable's control stability. Based on this, a Cauchy kernel-based maximum correntropy filter is developed to curb the influence of non-Gaussian measurement noise for enhancing the gyros/star sensor integration's robustness. Subsequently, an event-driven mechanism is constructed based on the filter's innovation information for further reducing the unnecessary computational cost to optimize the real-time performance. The effectiveness of the proposed method has been validated by simulations of the gyros/star sensor integration for spatial orientation. This shows that the proposed filtering methodology not only has strong robustness to deal with the influence of non-Gaussian measurement noise but can also achieve superior real-time spatial applications with a small computational cost, leading to enhanced performance for the turntable's spatial orientation using gyros/star sensor integration.

  Addresses:[Cui, Kai; Liu, Zhaohui; Han, Junfeng; Liu, Peng] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Cui, Kai; Liu, Zhaohui; Han, Junfeng; Liu, Peng] Xian Inst Opt & Precis Mech, Xian 710119, Peoples R China; [Cui, Kai; Liu, Zhaohui; Han, Junfeng; Liu, Peng] Chinese Acad Sci, Key Lab Space Precis Measurement Technol, Xian 710119, Peoples R China; [Ma, Yuke; Gao, Bingbing] Northwestern Polytech Univ, Sch Automat, Xian 710072, Peoples R China; [Gao, Bingbing] Northwestern Polytech Univ Shenzhen, Res & Dev Inst, Shenzhen 518063, Peoples R China

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

  Publication Year:2024

  Volume:24

  Issue:22

  Article Number:7164

  DOI Link:http://dx.doi.org/10.3390/s24227164

  数据库ID（收录号）:WOS:001366094800001
• Record 32 of
  
  Title:Optimization Algorithm for Flattop Beam Shaping Using Analytically Initial Phase
  
  Author Full Names:Ding, Huimin; Mao, Jianyong; Chen, Wenqiang; Chen, Kai; Li, Xun; Tan, Yu; Li, Ming; Zhang, Lei

  Source Title:IEEE PHOTONICS TECHNOLOGY LETTERS

  Language:English

  Document Type:Article

  Keywords Plus:DESIGN

  Abstract:Accurate control over light field distribution is of great importance to laser-based technologies. Here, an improved Gerchberg-Saxton (GS) algorithm is proposed to calculate the diffraction phase for flattop beam generation. In comparison with GS algorithm with a random phase as the initial phase of the iteration process, an analytical phase with a circular distribution is employed as the initial phase in the proposed algorithm. It is verified that the proposed algorithm can be used to generate flattop beams with improved uniformity and energy utilization ratio. Furthermore, both speckle noises and the ringing effect are effectively suppressed. We believe that the proposed diffraction phase optimization algorithm can be widely applied to high-quality beam shaping applications.

  Addresses:[Ding, Huimin; Mao, Jianyong; Chen, Wenqiang; Zhang, Lei] Xi An Jiao Tong Univ, Sch Elect Sci & Engn, Key Lab Phys Elect & Devices, Minist Educ, Xian 710049, Peoples R China; [Ding, Huimin; Mao, Jianyong; Chen, Wenqiang; Zhang, Lei] Xi An Jiao Tong Univ, Sch Elect Sci & Engn, Shaanxi Key Lab Informat Photon Tech, Xian 710049, Peoples R China; [Chen, Kai; Li, Xun; Tan, Yu; Li, Ming] Chinese Acad Sci, Xian Inst Opt & Precis Mech XIOPM, State Key Lab Transient Opt & Photon, Xian 710119, Peoples R China

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

  Publication Year:2024

  Volume:36

  Issue:21

  Start Page:1285

  End Page:1288

  DOI Link:http://dx.doi.org/10.1109/LPT.2024.3426528

  数据库ID（收录号）:WOS:001327394900004
• Record 33 of
  
  Title:Hybrid Space Calibrated 3D Network of Diffractive Hyperspectral Optical Imaging Sensor
  
  Author Full Names:Fan, Hao; Li, Chenxi; Gao, Bo; Xu, Huangrong; Chen, Yuwei; Zhang, Xuming; Li, Xu; Yu, Weixing

  Source Title:SENSORS

  Language:English

  Document Type:Article

  Keywords Plus:SYSTEM

  Abstract:Diffractive multispectral optical imaging plays an essential role in optical sensing, which typically suffers from the image blurring problem caused by the spatially variant point spread function. Here, we propose a novel high-quality and efficient hybrid space calibrated 3D network HSC3D for spatially variant diffractive multispectral imaging that utilizes the 3D U-Net structure combined with space calibration modules of magnification and rotation effects to achieve high-accuracy eight-channel multispectral restoration. The algorithm combines the advantages of the space calibrated module and U-Net architecture with 3D convolutional layers to improve the image quality of diffractive multispectral imaging without the requirements of complex equipment modifications and large amounts of data. A diffractive multispectral imaging system is established by designing and manufacturing one diffractive lens and four refractive lenses, whose monochromatic aberration is carefully corrected to improve imaging quality. The mean peak signal-to-noise ratio and mean structural similarity index of the reconstructed multispectral images are improved by 3.33 dB and 0.08, respectively, presenting obviously improved image quality compared with a typical Unrolled Network algorithm. The new algorithm with high space calibrated ability and imaging quality has great application potential in diffraction lens spectroscopy and paves a new method for complex practical diffractive multispectral image sensing.

  Addresses:[Fan, Hao; Li, Chenxi; Gao, Bo; Xu, Huangrong; Chen, Yuwei; Yu, Weixing] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Key Lab Spectral Imaging Technol, Xian 710119, Shaanxi, Peoples R China; [Fan, Hao; Gao, Bo; Chen, Yuwei; Yu, Weixing] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China; [Zhang, Xuming; Li, Xu] Hong Kong Polytech Univ, Dept Appl Phys, Hong Kong 999077, 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; Hong Kong Polytechnic University

  Publication Year:2024

  Volume:24

  Issue:21

  Article Number:6903

  DOI Link:http://dx.doi.org/10.3390/s24216903

  数据库ID（收录号）:WOS:001351047200001
• Record 34 of
  
  Title:Topology Optimization of the Bracket Structure in the Acquisition, Pointing, and Tracking System Considering Displacement and Key Point Stress Constraints
  
  Author Full Names:Gao, Bo; Yang, Hongtao; Chen, Weining; Wang, Hao

  Source Title:AEROSPACE

  Language:English

  Document Type:Article

  Keywords Plus:MORPHABLE COMPONENTS MMC; SHAPE; DESIGN

  Abstract:The lightweight and displacement-stable design of the mechanical support structure within the APTS (Acquisition, Pointing, and Tracking System) is crucial for enhancing the payload capacity of remote sensing, satellite communication, and laser systems, while still meeting specified functional requirements. This paper adopts the Solid Isotropic Material with Penalization (SIMP) method to investigate the structural topology optimization of the L-shaped bracket in the APTS, aiming to minimize structural compliance while using volume, key point displacement, and maximum stress as constraints. In the optimization model, differences in the topology of the L-shaped bracket structure are explored to minimize structural compliance, which was performed under volume, key point displacement, and stress constraints, and the results are compared with the initial reinforced structure. The innovative L-shaped bracket structure obtained through topology optimization uses significantly less material than the initial reinforced design, while still meeting the displacement and stress constraints. After smoothing, rounding, and finite element analysis, the displacement and stress performance of the optimized L-shaped bracket structure satisfies the set constraints. The method proposed in this paper offers an innovative solution for the lightweight design of mechanical support structures in APTS, with significant engineering application potential.

  Addresses:[Gao, Bo; Yang, Hongtao; Chen, Weining; Wang, Hao] Chinese Acad Sci, Xian Inst Opt & Precis Mech, 17 Xinxi Rd,New Ind Pk, Xian 710119, Peoples R China; [Gao, Bo] Xian Key Lab Spacecraft Opt Imaging & Measurement, 17 Xinxi Rd,New Ind Pk, Xian 710119, Peoples R China; [Gao, Bo; Yang, Hongtao] Univ Chinese Acad Sci, 1 Yangihu East Rd, Beijing 101408, 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

  Publication Year:2024

  Volume:11

  Issue:11

  Article Number:939

  DOI Link:http://dx.doi.org/10.3390/aerospace11110939

  数据库ID（收录号）:WOS:001363543100001
• Record 35 of
  
  Title:Co-axial superposition: generation of perfect vortex beams with multi-openings and adjustable spherical symmetry
  
  Author Full Names:Hussain, Anwar; Zhou, Meiling; Zhou, Yuan; Li, Runze; Peng, Tong; Yan, Shaohui; Min, Junwei; Dan, Dan; Yao, Baoli

  Source Title:JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION

  Language:English

  Document Type:Article

  Keywords Plus:ORBITAL ANGULAR-MOMENTUM; OPTICAL VORTEX; TRANSFORMATION; VORTICES; LIGHT

  Abstract:The perfect vortex beam, with a diameter that remains independent of the topological charge, has numerous applications in far-field information propagation. In this study, a hologram is obtained through the co-spiral superposition of two primary spiral axicons which is assigned to spatial light modulator for the generation of perfect vortex beams. Key parameters such as the topological charge and intra-ring spacing of individual spiral axicons play critical roles in controlling the characteristics of the resulting perfect vortex beam through the resultant hologram. By adjusting these parameters, precise control can be exerted over the number of openings in the beam and the diameter of the central dark area of the beam. The generation of the entire family of vortex beams with both odd and even numbers of openings in both symmetrical and asymmetrical geometry of the vortex beam petals is presented in simulation and experiment. The perfect vortex beam reported here is characterized by its adjustable number of openings and controllable petal size, holding significant potential for applications in optical trapping. The existence of multiple circular vortex petals with different radii is expected to enable the optical sorting of different particles. (c) 2024 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.

  Addresses:[Hussain, Anwar; Zhou, Meiling; Zhou, Yuan; Li, Runze; Peng, Tong; Yan, Shaohui; Min, Junwei; Dan, Dan; Yao, Baoli] Chinese Acad Sci, Xian Inst Opt & Precis Mech, State Key Lab Transient Opt & Photon, Xian 710119, Peoples R China; [Hussain, Anwar] COMSATS Univ Islamabad CUI, Pk Rd, Islamabad 45550, Pakistan; [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; COMSATS University Islamabad (CUI); Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS

  Publication Year:2024

  Volume:41

  Issue:11

  Start Page:2149

  End Page:2155

  DOI Link:http://dx.doi.org/10.1364/JOSAA.537676

  数据库ID（收录号）:WOS:001345437300009
• Record 36 of
  
  Title:Online Optical Axis Parallelism Measurement Method for Continuous Zoom Camera Based on High-Precision Spot Center Positioning Algorithm
  
  Author Full Names:Kang, Chanchan; Fang, Yao; Wang, Huawei; Zhou, Feng; Ren, Zeyue; Han, Feixiang

  Source Title:PHOTONICS

  Language:English

  Document Type:Article

  Abstract:Ensuring precise alignment of the optical axis is critical for achieving high-quality imaging in continuous zoom cameras. However, existing methods for measuring optical axis parallelism often lack accuracy and fail to assess parallelism across the entire focal range. This study introduces an online measurement method designed to address these limitations by incorporating two enhancements. First, image processing methodologies enable sub-pixel-level extraction of the spot center, achieved through improved morphological processing and the incorporation of an edge tracing algorithm. Second, measurement software developed using Qt Creator can output real-time data on optical axis parallelism across the full focal range post-measurement. This software features a multi-threaded architecture that facilitates the concurrent execution of image acquisition, data processing, and serial communication. Experimental results derived from simulations and real data indicate that the maximum average error in extracting the center of the spot is 0.13 pixels. The proposed system provides critical data for optical axis calibration during camera adjustment and inspection.

  Addresses:[Kang, Chanchan; Fang, Yao; Wang, Huawei; Zhou, Feng; Ren, Zeyue; Han, Feixiang] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R China; [Kang, Chanchan; Zhou, Feng; Ren, Zeyue; Han, Feixiang] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Kang, Chanchan; Fang, Yao; Wang, Huawei; Zhou, Feng; Ren, Zeyue; Han, Feixiang] Xian Key Lab Spacecraft Opt Imaging & Measurement, Xian 710119, 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

  Publication Year:2024

  Volume:11

  Issue:11

  Article Number:1017

  DOI Link:http://dx.doi.org/10.3390/photonics11111017

  数据库ID（收录号）:WOS:001365839800001