2024

• Record 205 of
  
  Title:Dynamic multi-focus laser sculpting of freeform 3D glass microstructures
  
  Author Full Names:Yao, Li; Xu, Kang; Huang, Lingyu; Huang, Peilin; Li, Zongyao; Wang, Pu; Xu, Shaolin

  Source Title:OPTICS AND LASERS IN ENGINEERING

  Language:English

  Document Type:Article

  Abstract:The three-dimensional (3D) sculpturing of glass remains a significant challenge owing to its inherent hard and brittle nature. We develop a novel dynamic multi-focus laser sculpting (DMLS) method tailored for 3D glass fabrication. This method employs two-dimensional (2D) spatial multi-focus beams to form sectional profiles of 3D structures, which are modulated by superimposing the phase of Fresnel lenses and blazed gratings. With dynamic switching of phase diagrams on a spatial light modulator, the multi-focus beam rotates and creates a customized 3D laser-modified region inside the bulk glass. Following chemical etching helps remove the modified zones, forming ultimate 3D morphology on glass surface. The feasibility of this method hinges upon achieving uniform foci energy and narrow spatial foci intervals, essential for the precise removal of modified regions through connected crack channels during etching. We propose an extracting strategy to separate foci with random sequences into several groups to disrupt the periodicity of foci, thereby effectively weakening the unexpected Moire fringes on the phase diagrams. This strategy enables the forming of dense foci by a single diagram with high uniformity, shortening the interval between foci. Further, for the lower surface roughness and higher precision of 3D structures, optimization of fabrication parameters is applied by experimental and numerical analysis. With the above optimization, the DMLS method is capable of carving diversified 3D glass structures, including hemispheres, cones, pyramids, semi-ellipsoids, and petal-like structures. Our method exhibits considerable versatility in processible structures with shape deviation lower than 1.9 mu m, showing substantial potential in glass processing.

  Addresses:[Yao, Li; Xu, Kang; Huang, Lingyu; Huang, Peilin; Li, Zongyao; Wang, Pu; Xu, Shaolin] Southern Univ Sci & Technol, Dept Mech & Energy Engn, 1088 Xueyuan Ave, Shenzhen 518055, Peoples R China; [Wang, Pu] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Adv Opt Instrument Res Dept, Xian 710119, Peoples R China; [Wang, Pu] Xian Key Lab High Power Laser Measurement Technol, Xian 710119, Peoples R China

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

  Publication Year:2024

  Volume:180

  Article Number:108278

  DOI Link:http://dx.doi.org/10.1016/j.optlaseng.2024.108278

  数据库ID（收录号）:WOS:001242739800001
• Record 206 of
  
  Title:Single shot depth-resolved imaging through dynamic turbid media
  
  Author Full Names:Li, Runze; Peng, Tong; Bai, Chen; Zhou, Meiling; Yu, Xianghua; Min, Junwei; Yang, Yanlong; Yao, Baoli

  Source Title:APPLIED PHYSICS LETTERS

  Language:English

  Document Type:Article

  Keywords Plus:SCATTERING MEDIA; TIME; LOOKING; LAYERS; WAVES; LIGHT

  Abstract:Guide star assisted wavefront shaping techniques have been exploited for focusing and imaging through turbid media by addressing a scatter inverse pattern. However, the turbid medium is required to be steady before finding the proper correction pattern, which limits applications in focusing and imaging through dynamic media, such as turbid water or blood. This study proposes a holography-based dual-polarization computational wavefront shaping method for imaging objects at variant depths behind dynamic turbid media. The orthogonal polarized output speckles of a point source (considered as a guide star) and an object are simultaneously recorded in holograms in separate regions of a single CCD camera. The holograms of the point source and object are subjected to the same distortion regardless of whether the media is static or dynamic. The hologram of the point source is used to determine the correction phase pattern for the distortion, while that of the object is used to record the complex scattered wavefront of the object. To reconstruct a clear object image, the wavefront of the scattered object is digitally corrected using the correction phase pattern and is then transferred to the image plane by calculating the transmission of the angular spectrum. Benefiting from the autofocusing feature of digital holography, objects at different depths can be recovered from a single shot hologram pair. The potential applications of the proposed method in diverse dynamic scattering media are demonstrated by imaging through a moving diffuser, turbid water, and pig blood with optical depth beyond 10.

  Addresses:[Li, Runze; Peng, Tong; Bai, Chen; Zhou, Meiling; Yu, Xianghua; Min, Junwei; Yang, Yanlong; Yao, Baoli] Chinese Acad Sci, State Key Lab Transient Opt & Photon, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R China; [Yao, Baoli] Univ Chinese Acad Sci, Beijing 100049, 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

  Publication Year:2024

  Volume:124

  Issue:20

  Article Number:201109

  DOI Link:http://dx.doi.org/10.1063/5.0201501

  数据库ID（收录号）:WOS:001227746700009
• Record 207 of
  
  Title:Efficient characterizations of multiphoton states with an ultra-thin optical device
  
  Author Full Names:An, Kui; Liu, Zilei; Zhang, Ting; Li, Siqi; Zhou, You; Yuan, Xiao; Wang, Leiran; Zhang, Wenfu; Wang, Guoxi; Lu, He

  Source Title:NATURE COMMUNICATIONS

  Language:English

  Document Type:Article

  Keywords Plus:ENTANGLED STATES; QUANTUM; POLARIZATION; METASURFACES

  Abstract:Metasurface enables the generation and manipulation of multiphoton entanglement with flat optics, providing a more efficient platform for large-scale photonic quantum information processing. Here, we show that a single metasurface optical device would allow more efficient characterizations of multiphoton entangled states, such as shadow tomography, which generally requires fast and complicated control of optical setups to perform information-complete measurements, a demanding task using conventional optics. The compact and stable device here allows implementations of general positive operator valued measures with a reduced sample complexity and significantly alleviates the experimental complexity to implement shadow tomography. Integrating self-learning and calibration algorithms, we observe notable advantages in the reconstruction of multiphoton entanglement, including using fewer measurements, having higher accuracy, and being robust against experimental imperfections. Our work unveils the feasibility of metasurface as a favorable integrated optical device for efficient characterization of multiphoton entanglement, and sheds light on scalable photonic quantum technologies with ultra-thin optical devices. Shadow tomography is efficient for quantum state characterization. Here, the authors implement shadow tomography on photonic states with a single metasurface, which alleviates the complexity in measurement

  Addresses:[An, Kui; Zhang, Ting; Lu, He] Shandong Univ, Sch Phys, State Key Lab Crystal Mat, Jinan 250100, Peoples R China; [Liu, Zilei; Li, Siqi; Wang, Leiran; Zhang, Wenfu; Wang, Guoxi] Chinese Acad Sci, State Key Lab Transient Opt & Photon, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R China; [Liu, Zilei; Wang, Leiran; Zhang, Wenfu; Wang, Guoxi] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Zhou, You] Fudan Univ, Key Lab Informat Sci Electromagnet Waves, Minist Educ, Shanghai 200433, Peoples R China; [Zhou, You] Hefei Natl Lab, Hefei 230088, Peoples R China; [Yuan, Xiao] Peking Univ, Ctr Frontiers Comp Studies, Beijing 100871, Peoples R China; [Lu, He] Shandong Univ, Shenzhen Res Inst, Shenzhen 518057, Peoples R China

  Affiliations:Shandong University; 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; Fudan University; Hefei National Laboratory; Peking University; Shandong University

  Publication Year:2024

  Volume:15

  Issue:1

  Article Number:3944

  DOI Link:http://dx.doi.org/10.1038/s41467-024-48213-4

  数据库ID（收录号）:WOS:001221549300047
• Record 208 of
  
  Title:A 90Sr/90Y-radioisotope battery based on betavoltaic and beta-photovoltaic dual effects
  
  Author Full Names:Cui, Qiming; Lu, Jingbin; Li, Xiaoyi; Yuan, Xinxu; Zhao, Yang; Zheng, Renzhou; Li, Qingyang; Wei, Jie; Luo, Baifeng; Lin, Li

  Source Title:MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING

  Language:English

  Document Type:Article

  Keywords Plus:OPTIMIZATION DESIGN

  Abstract:Betavoltaic batteries with strontium sources are expected to achieve higher output power because of their high energy density and low self-absorption rate with the development of MEMS. However, the high energy of beta particles emitted from Sr-90/Y-90 can prone to radiation damage of the semiconductor. In order to exploit the high energy of beta particles emitted from Sr-90/Y-90 and to avoid radiation damage to the semiconductor, this paper presents a Sr-90/Y-90- radioisotope battery based on betavoltaic (BV) and beta -photovoltaic (BPV) dual effects. In the work, the energy deposition of beta particles in LYSO:Ce and GaAs was simulated by Monte Carlo code, and thickness of the scintillator was determined. And the doping concentrations and junction depth of semiconductor were optimized based on the theoretical calculations to obtain the best output performance of device. When the thickness of LYSO:Ce is 0.158 cm, the output power density P-m of the optimized dualeffect battery is 0.61 mu W/cm(2) . And the conversion efficiency of the device is 0.92%. At this time, the doping concentrations are N-a = 1 . 58 x 10(17) cm(-3) and N-d = 3 . 16 x 10(18) cm(-3) , and the junction depth x(j )= 0 . 05 mu m. All calculated parameter values are considered as theoretical limit values. In addition, the contribution of BV effect and BPV effect to the output performance of the dual -effect radioisotope battery was investigated. Different scintillator thicknesses lead to different percentages of the two mechanics. In addition, the BV effect and BPV effect output proportion is also affected by the average energy of the radiation source. In the case that the average electron energy on the semiconductor surface is 0.27 MeV, the higher the radioactive source energy, the thicker the scintillator is required, resulting in more BPV effect and less BV effect.

  Addresses:[Cui, Qiming; Lu, Jingbin; Li, Xiaoyi; Yuan, Xinxu; Zhao, Yang; Zheng, Renzhou] Jilin Univ, Coll Phys, Changchun 130012, Peoples R China; [Zheng, Renzhou] Chinese Acad Sci, State Key Lab Transient Opt & Photon, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R China; [Wei, Jie; Luo, Baifeng] China Southern Power Grid, Guangdong Prov Key Lab Digital Grid Technol, Digital Grid Res Inst, Guangzhou 510663, Peoples R China; [Lin, Li] China Southern Power Grid AI Technol Co Ltd, Guangzhou 510663, Peoples R China

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

  Publication Year:2024

  Volume:179

  Article Number:108493

  DOI Link:http://dx.doi.org/10.1016/j.mssp.2024.108493

  数据库ID（收录号）:WOS:001240817500001
• Record 209 of
  
  Title:Influencing mechanisms of hot isostatic pressing on surface properties of additively manufactured AlSi10Mg alloy
  
  Author Full Names:Sun, Lijun; Yang, Yulei; Li, Siyuan; Chen, Wencong; Wang, Yichun; Yan, Peng; Zhu, Yueqi; Wu, Weichao; Hu, Bingliang

  Source Title:JOURNAL OF MATERIALS PROCESSING TECHNOLOGY

  Language:English

  Document Type:Article

  Keywords Plus:PARTS

  Abstract:Additively manufactured AlSi10Mg alloys have received considerable attention due to the prospectives in lightweight structural applications. Hot isostatic pressing (HIP) is widely utilized to minimize internal pores and enhance mechanical properties in terms of fatigue strength and ductility. Whereas the influence and mechanisms of HIP on surface properties, which is of crucial importance for aerospace optical components, remain to be further clarified. In the present study, systematic surface and subsurface analysis were conducted to unveil the underlying mechanisms of HIP on the surface qualities of an additively manufactured AlSi10Mg alloy. Threedimensional white-light interfering profilometer, high-resolution X-ray micro computed tomography, X-ray diffraction, scanning electron microscope and transmission electron microscope were exploited to characterize the surface and subsurface alterations induced by HIP. The results demonstrate that, although remarkable reduction in the amount and size of internal pores can be achieved, sharp increase in the surface defects and roughness occurred for the precisely machined surface of the HIP treated alloy. Surface and subsurface analysis reveal that the deterioration in surface properties results from the establishment of micron Si particles and the reduction in nanohardness induced by HIP treatment.

  Addresses:[Sun, Lijun; Wu, Weichao] Beijing Inst Technol, Sch Mechatron Engn, Beijing 100081, Peoples R China; [Sun, Lijun; Li, Siyuan; Chen, Wencong; Wang, Yichun; Yan, Peng; Zhu, Yueqi; Hu, Bingliang] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R China; [Yang, Yulei] Nanjing Univ Sci & Technol, Sch Mech Engn, Nanjing 210094, Peoples R China

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

  Publication Year:2024

  Volume:329

  Article Number:118426

  DOI Link:http://dx.doi.org/10.1016/j.jmatprotec.2024.118426

  数据库ID（收录号）:WOS:001238979200001
• Record 210 of
  
  Title:Fabricating S-scheme Sb 2 S 3 @CdSe x S 1- x quasi-one-dimensional heterojunction photoanodes by in-situ growth strategy towards photoelectrochemical water splitting
  
  Author Full Names:Liu, Dekang; Zhang, Dekai; Wang, Yishan; Liu, Enzhou; Mia, Hui

  Source Title:JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY

  Language:English

  Document Type:Article

  Keywords Plus:HETEROSTRUCTURE; PHOTOCATALYST; CONSTRUCTION; PERFORMANCE; DEPOSITION; AU

  Abstract:Nowadays, energy and environmental problems are becoming increasingly prominent in society, the development of clean and environmentally friendly energy is in line with the construction of ecological civilization and energy, which have attracted the attention of many researchers over the past decades. Narrow band gap semiconductor Sb 2 S 3 is widely used in the area of solar cells because of its high light absorption coefficient and suitable bandgap width. However, numerous deep -level defects provide plentiful photogenerated carrier recombination sites, which restricts the improvement of photoelectrochemical properties seriously. In this work, S -scheme Sb 2 S 3 @CdSe x S 1- x core -shell quasi -one-dimensional heterojunction photoanodes were prepared on the FTO substrate by a two-step vapor transport deposition (VTD) method, chemical bath deposition (CBD) and in -situ selenization method. The results showed that CdSe x S 1- x nanoparticles (NPs) were tightly coated on the Sb 2 S 3 nanorods (NRs). The photocurrent density of the Sb 2 S 3 @CdSe x S 1- x photoanodes was 1.61 mA cm -2 under 1.23 V RHE . Compared with the Sb 2 S 3 photoanodes (0.61 mA cm -2 ), Sb 2 S 3 @CdSe x S 1- x photoanodes obtained a 2.64 -fold improvement, and the dark current was effectively reduced. It showed excellent stability and fast photocurrent response in a 600 s optical stability test. It was concluded that: (1) The charge transfer mechanism of the S -scheme can avoid the problem of high recombination rate of photogenerated charge carriers due to the defects of Sb 2 S 3 effectively, and realized spatial separation of photogenerated carriers. (2) The [ hk 1] oriented Sb 2 S 3 NRs and the formed quasi -one-dimensional heterostructures promote efficient carrier transport. (3) The introduction of Se effectively regulated the band structure of CdS, slowed down the photocorrosion of S, and improved the stability of the photoelectrodes significantly. (c) 2024 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

  Addresses:[Liu, Dekang; Zhang, Dekai; Mia, Hui] Northwest Univ, Sch Phys, Xian 710127, Peoples R China; [Wang, Yishan] Chinese Acad Sci, State Key Lab Transient Opt & Photon, Xian 710119, Peoples R China; [Liu, Enzhou] Northwest Univ, Sch Chem Engn, Xian 710127, Peoples R China

  Affiliations:Northwest University Xi'an; Chinese Academy of Sciences; State Key Laboratory of Transient Optics & Photonics; Northwest University Xi'an

  Publication Year:2024

  Volume:201

  Start Page:250

  End Page:260

  DOI Link:http://dx.doi.org/10.1016/j.jmst.2024.02.049

  数据库ID（收录号）:WOS:001273136700001
• Record 211 of
  
  Title:Simulation of evaporation ablation dynamics of materials by nanosecond pulse laser of Gaussian beam and flat-top beam
  
  Author Full Names:Yin Pei-Qi; Xu Bo-Ping; Liu Ying-Hua; Wang Yi-Shan; Zhao Wei; Tang Jie

  Source Title:ACTA PHYSICA SINICA

  Language:Chinese

  Document Type:Article

  Keywords Plus:INDUCED BREAKDOWN SPECTROSCOPY; ALUMINUM-ALLOYS; VAPORIZATION; TRANSITION; TARGET; LIBS

  Abstract:Based on the established two-dimensional asymmetric model of the interaction between a nanosecond pulse laser and metallic aluminum, the effect of beam shaping on the evaporation ablation dynamics during the ablation of metallic aluminum by a nanosecond pulse laser is simulated. The results show that plasma shielding, which has a significant influence on the ablation properties of the target, occurs mainly in the middle phase and late phase of the pulse. Among the three laser profiles, the Gaussian beam has the strongest shielding effect. As the diameter of the reshaped flat-top beam increases, the shielding effect gradually weakens. The two-dimensional spatial distribution of target temperature is relatively different between ablation by a Gaussian beam and that by a flat-top beam. For the Gaussian beam, the center of the target is first heated, and then the temperature spreads in radial direction and axial direction. For the flat-top beam, due to the uniform energy distribution, the target is heated within a certain radial range simultaneously. Beam shaping has a great influence on the evaporation ablation dynamics of the target. For the Gaussian beam, the center of the target is first ablated, followed by the radial ablation. For the flat-top beam, the evaporation time of the target surface is delayed due to the lower energy density after the beam has been shaped. In addition, the target evaporates simultaneously in a certain radial range due to the more uniform distribution of laser energy. For each of the three laser profiles, the evaporation morphology of the target resembles the intensity distribution of the laser beam. The crater produced by the Gaussian beam is deep in the center and shallow on both sides, while it becomes relatively flat by the flat-top beam.

  Addresses:[Yin Pei-Qi; Xu Bo-Ping; Liu Ying-Hua; 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; [Yin Pei-Qi; Xu Bo-Ping; Liu Ying-Hua; Wang Yi-Shan; Zhao Wei; Tang Jie] Univ Chinese Acad Sci, Beijing 100049, 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

  Publication Year:2024

  Volume:73

  Issue:9

  Article Number:95202

  DOI Link:http://dx.doi.org/10.7498/aps.73.20231625

  数据库ID（收录号）:WOS:001224196800019
• Record 212 of
  
  Title:Optical diffraction tomography based on quadriwave lateral shearing interferometry
  
  Author Full Names:Yuan, Xun; Min, Junwei; Zhou, Yuan; Xue, Yuge; Bai, Chen; Li, Manman; Xu, Xiaohao; Yao, Baoli

  Source Title:OPTICS AND LASER TECHNOLOGY

  Language:English

  Document Type:Article

  Keywords Plus:HOLOGRAPHIC TOMOGRAPHY; MICROSCOPY; RECONSTRUCTION

  Abstract:Optical diffraction tomography (ODT) is an emerging microscopy that enables quantitatively three-dimensional (3D) refractive index (RI) mapping of subcellular structure inside biological cells without staining. Due to the noninvasive, label -free, and quantitative imaging capability, ODT has become an important technique in the fields of cell biology, biophysics, hematology, and so on. It is customary to acquire a set of two-dimensional (2D) phase images of a transparent sample from different illumination angles by using the classical Mach-Zehnder interferometry (MZI), and then numerically reconstruct the 3D RI distribution of the sample via appropriate tomographic algorithms. However, due to the limited stability of MZI, the cumulative measured phase errors reduce the accuracy of the reconstructed RI. Here, we propose a common -path ODT based on quadriwave lateral shearing interferometry (QLSI), referred as Q-ODT. In QLSI, the object beam carrying the phase information of sample is divided into four copies by a specially designed 2D diffraction optical element, then the diffracted waves interfere with each other to form the interferogram at the image plane. The complex amplitude map of the object is quantitatively retrieved from the single -shot interferogram by using a Fourier analysis algorithm and a 2D phase gradient integration. A spatial light modulator is employed to ensure high -precision illumination angle scanning without mechanical motion by addressing a series of different periods and orientations blazed gratings. The average fluctuation of the measured phases of a test polystyrene bead by acquiring 300 interferograms in 12 s presents 7.6 mrad, surpassing the conventional MZI-based ODT. The 3D RI distribution of the bead reconstructed from 145 complex amplitude maps via multi -illumination angles with a maximum angle of 70 degrees matches the manufacturer ' s specification well, demonstrating the high accuracy of the 3D RI imaging capability of the QODT. The lateral and axial resolutions of the 3D RI reconstruction were measured to be 306 +/- 21 nm and 825 +/- 34 nm, respectively. The proposed Q-ODT method successfully reconstructed the intracellular structure of the biological specimens of Eudorina elegans and mouse bone mesenchymal stem cells (BMSC). The Q-ODT offers a new route towards 3D RI imaging for label -free transparent samples in biomedical research.

  Addresses:[Yuan, Xun; Min, Junwei; Zhou, Yuan; Xue, Yuge; Bai, Chen; Li, Manman; Xu, Xiaohao; Yao, Baoli] Chinese Acad Sci, Xian Inst Opt & Precis Mech, State Key Lab Transient Opt & Photon, Xian 710119, Peoples R China; [Yuan, Xun; Zhou, Yuan; Xue, Yuge; 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:177

  Article Number:111124

  DOI Link:http://dx.doi.org/10.1016/j.optlastec.2024.111124

  数据库ID（收录号）:WOS:001239072400001
• Record 213 of
  
  Title:Low self-starting threshold polarization-maintaining Er-doped fiber optical frequency comb
  
  Author Full Names:Gao, Yanwei; Cheng, Haihao; Hu, Xiaohong; Li, Yongqi; Liu, Hao; Yang, Yanzhao; Pan, Ran; Wang, Yishan; Wu, Shun

  Source Title:OPTICS AND LASER TECHNOLOGY

  Language:English

  Document Type:Article

  Keywords Plus:ABSORPTION

  Abstract:We report the development of an all-fiber polarization maintaining (PM) optical frequency comb using a modelocked figure -9 laser with a low self-starting pump threshold. We have achieved self-starting mode -lock for repetition rates ( f r ) from 70 MHz to 109 MHz. At a repetition rate of 109 MHz, mode-locking can be achieved for a pump power ranging from 187 mW to 880 mW. To the best of our knowledge, this is the lowest pump power reported for PM figure -9 erbium fiber lasers with repetition rate over 100 MHz. By optimizing the pump power to 238 mW, we have achieved an output power of 5 mW, center wavelength of 1566.2 nm, and 3 -dB spectral bandwidth of 20.5 nm. The repetition rate has a high signal -to -noise ratio of 95 dB at a resolution bandwidth of 300 Hz. We have studied the spectral characteristics of the laser under different cavity lengths and pump powers. Additionally, we have stabilized the repetition rate using a GPS-Rb disciplined RF reference. The fractional instability of the repetition rate is measured to be 4 .67 x 10 - 12 at 1 s and 9 .22 x 10 - 13 at 10 s over a measurement of 11 h. Our findings demonstrate that the developed figure -9 comb is robust, compact and has the advantage of high stability and low power consumption. It offers a cost effective solution for future outdoor comb applications.

  Addresses:[Gao, Yanwei; Li, Yongqi; Liu, Hao; Wu, Shun] Wuhan Inst Technol, Hubei Key Lab Opt Informat & Pattern Recognit, Wuhan 430205, Peoples R China; [Cheng, Haihao; Hu, Xiaohong; Pan, Ran; Wang, Yishan] Chinese Acad Sci, Xian Inst Opt & Precis Mech, State Key Lab Transient Opt & Photon, Xian 710119, Peoples R China; [Yang, Yanzhao] China Elect Technol Grp Corp, Inst 41, Beijing, Peoples R China

  Affiliations:Wuhan Institute of Technology; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; State Key Laboratory of Transient Optics & Photonics; China Electronics Technology Group

  Publication Year:2024

  Volume:177

  Article Number:111092

  DOI Link:http://dx.doi.org/10.1016/j.optlastec.2024.111092

  数据库ID（收录号）:WOS:001236797800001
• Record 214 of
  
  Title:A Dual-FSM GI LiDAR Imaging Control Method Based on Two-Dimensional Flexible Turntable Composite Axis Tracking
  
  Author Full Names:Cao, Yu; Xie, Meilin; Wang, Haitao; Hao, Wei; Guo, Min; Jiang, Kai; Wang, Lei; Guo, Shan; Wang, Fan

  Source Title:REMOTE SENSING

  Language:English

  Document Type:Article

  Abstract:In this study, a tracking and pointing control system with a dual-FSM (fast steering mirror) two-dimensional flexible turntable composite axis is proposed. It is applied to the target-tracking accuracy control in a GI LiDAR (ghost imaging LiDAR) system. Ghost imaging is a multi-measurement imaging method; the dual-FSM GI LiDAR tracking and pointing imaging control system proposed in this study mainly solves the problems of the high-resolution remote sensing imaging of high-speed moving targets and various nonlinear disturbances when this technology is transformed into practical applications. Addressing the detrimental effects of nonlinear disturbances originating from internal flexible mechanisms and assorted external environmental factors on motion control's velocity, stability, and tracking accuracy, a nonlinear active disturbance rejection control (NLADRC) method based on artificial neural networks is advanced. Additionally, to overcome the limitations imposed by receiving aperture constraints in GI LiDAR systems, a novel optical path design for the dual-FSM GI LiDAR tracking and imaging system is put forth. The implementation of the described methodologies culminated in the development of a dual-FSM GI LiDAR tracking and imaging system, which, upon thorough experimental validation, demonstrated significant improvements. Notably, it achieved an improvement in the coarse tracking accuracy from 193.29 mu rad (3 sigma) to 87.21 mu rad (3 sigma) and enhanced the tracking accuracy from 10.1 mu rad (sigma) to 1.5 mu rad (sigma) under specified operational parameters. Furthermore, the method notably diminished the overshoot during the target capture process from 28.85% to 12.8%, concurrently facilitating clear recognition of the target contour. This research contributes significantly to the advancement of GI LiDAR technology for practical application, showcasing the potential of the proposed control and design strategies in enhancing system performance in the face of complex disturbances.

  Addresses:[Cao, Yu; Xie, Meilin; Wang, Haitao; Hao, Wei; Guo, Min; Jiang, Kai; Wang, Lei; Guo, Shan; Wang, Fan] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R China; [Cao, Yu; Xie, Meilin; Wang, Haitao; Hao, Wei; Guo, Min; Jiang, Kai; Wang, Lei; Guo, Shan; Wang, Fan] Chinese Acad Sci, Key Lab Space Precis Measurement Technol, Xian 710119, Peoples R China; [Cao, Yu; Xie, Meilin; Hao, Wei; Guo, Min] Pilot Natl Lab Marine Sci & Technol, Qingdao 266237, Peoples R China; [Cao, Yu] Shanxi Univ, Collaborat Innovat Ctr Extreme Opt, Taiyuan 030006, Peoples R China

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

  Publication Year:2024

  Volume:16

  Issue:10

  Article Number:1679

  DOI Link:http://dx.doi.org/10.3390/rs16101679

  数据库ID（收录号）:WOS:001231163900001
• Record 215 of
  
  Title:High Fidelity Full-Color Optical Sectioning Structured Illumination Microscopy by Fourier Domain Based Reconstruction
  
  Author Full Names:Dang, Shipei; Qian, Jia; Ma, Wang; Ma, Rui; Li, Xing; Wang, Siying; Bai, Chen; Dan, Dan; Yao, Baoli

  Source Title:PHOTONICS

  Language:English

  Document Type:Article

  Abstract:The natural color of biological specimens plays a crucial role in body protection, signaling, physiological adaptations, etc. Full-color optical sectioning structured illumination microscopy (OS-SIM) color is a promising approach that can reconstruct biological specimens in three-dimension meanwhile maintaining their natural color. Full-color OS-SIM takes the advantages of rapid imaging speed, compatibility with fluorescence and non-fluorescence samples, compact configuration, and low cost. However, the commonly used HSV-RMS reconstruction algorithm for full-color OS-SIM faces two issues to be improved. One is the RMS (root-mean-square) OS reconstruction algorithm is prone to background noise, and the other is the reconstruction is bound in RGB and HSV color spaces, consuming more reconstructing time. In this paper, we propose a full-color Fourier-OS-SIM method that allows for the OS reconstruction using the high-frequency spectrum of the sample and thus is immune to the low-frequency background noise. The full-color Fourier-OS-SIM directly runs in the RGB color space, providing an easy way to restore the color information. Simulation and experiments with various samples (pollen grains and tiny animals) demonstrate that the full-color Fourier-OS-SIM method is superior to the HSV-RMS method regarding background noise suppression. Moreover, benefiting from the background noise suppression merit, the quantitative morphological height map analysis with the full-color Fourier-OS-SIM method is more accurate. The proposed full-color Fourier-OS-SIM method is expected to find broad applications in biological and industrial fields where the 3D morphology and the color information of objects both need to be recovered.

  Addresses:[Dang, Shipei; Qian, Jia; Ma, Wang; Ma, Rui; Li, Xing; Wang, Siying; Bai, Chen; Dan, Dan; Yao, Baoli] Chinese Acad Sci, Xian Inst Opt & Precis Mech, State Key Lab Transient Opt & Photon, Xian 710119, Peoples R China; [Dang, Shipei; Ma, Wang; Ma, Rui; Li, Xing; Wang, Siying; 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:11

  Issue:5

  Article Number:405

  DOI Link:http://dx.doi.org/10.3390/photonics11050405

  数据库ID（收录号）:WOS:001233232500001
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  Title:A frequency-response-optimized Shack-Hartmann zonal wavefront reconstructor based on Fan's model
  
  Author Full Names:Fan, Yao; Duan, Yaxuan; Da, Zhengshang; Yue, Yang

  Source Title:REVIEW OF SCIENTIFIC INSTRUMENTS

  Language:English

  Document Type:Article

  Keywords Plus:ALGORITHM; SENSOR

  Abstract:This paper introduces an optimized method for zonal wavefront reconstruction utilizing Fan's model, specifically tailored to enhance the frequency response. Analysis of the system frequency response demonstrates a 27% increase in bandwidth compared to the Southwell model. Examination of reconstruction errors at various frequency points reveals consistently smaller values when compared to the Southwell model. Validation through numerical simulations and real experiments underscores the superior performance of the proposed reconstructor, particularly noticeable at higher response levels within the mid- and high-frequency domains.

  Addresses:[Fan, Yao; Duan, Yaxuan; Da, Zhengshang] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Adv Opt Instrument Lab, Xian 710119, Peoples R China; [Fan, Yao; Yue, Yang] Xi An Jiao Tong Univ, Sch Informat & Commun Engn, Xian 710049, Peoples R China; [Fan, Yao; Duan, Yaxuan; Da, Zhengshang] Univ Chinese Acad Sci, Xian 710119, Peoples R China; [Fan, Yao; Duan, Yaxuan; Da, Zhengshang] Xian Key Lab High Power Laser Measurement Technol, Xian 710119, Peoples R China

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

  Publication Year:2024

  Volume:95

  Issue:5

  Article Number:55004

  DOI Link:http://dx.doi.org/10.1063/5.0197071

  数据库ID（收录号）:WOS:001220715900001