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Experimental and numerical investigation of mid-infrared laser in Pr^(3+)-doped chalcogenide fiber

Chinese Physics B 2019年第2期28卷 257-263页

作者： Hua Chen Ke-Lun Xia Zi-Jun Liu Xun-Si Wang Xiang-Hua Zhang Yin-Sheng Xu Shi-Xun Dai Laboratory of Infrared Materials and Devices Advanced Technology Research InstituteNingbo University Key Laboratory of Photoelectric Detection Materials and Devices of Zhejiang Province Laboratory of Glasses and Ceramics UMR CNRS 6226University of Rennes 1

We report on a chalcogenide glass fiber doped with Pr^(3+) that can be used for commercialized 1.5-μm and 2-μm laser excitations by emitting broadband 3 μm–5.5 μm fluorescence, which is extruded into a preform and then drawn into a step-index fiber. The spectroscopic properties of the fiber and glass are reported, and the mid-infrared fiber lasers are also numerically investigated. Cascade lasing is employed to increase the inversion population of the upper laser level. The particle swarm approach is applied to optimize the fiber laser parameters. The output power can reach 1.28 W at 4.89-μm wavelength, with a pump power of 5 W, excitation wavelength at 2.04 μm, Pr^(3+) ion concentration at 4.22 × 10^(25) ions/m^3,fiber length at 0.94 m, and fiber background loss at 3 dB/m.

关键词： mid-infrared fiber laser chalcogenide glass fiber rare earth doped glass fiber laser modelling

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A Heliocentric-orbiting Objects Processing System (HOPS) for the Wide Field Survey Telescope: Architecture, Processing Workflow, and Preliminary Results

arXiv

引用

arXiv 2025年

作者： Wang, Shao-Han Fu, Bing-Xue Lu, Jun-Qiang Fan, LuLu Cai, Min-Xuan Xu, Ze-Lin Kong, Xu Zhao, Haibin Li, Bin Liu, Ya-Ting Zhu, Qing-Feng Zhou, Xu Wan, Zhen Cheng, Jingquan Jiang, Ji-An Li, Feng Liang, Ming Liu, Hao Luo, Wentao Lou, Zhen Wang, Hairen Wang, Jian Wang, Tinggui Xue, Yongquan Zhang, Hongfei Zhao, Wen Department of Astronomy University of Science and Technology of China Hefei230026 China School of Astronomy and Space Science University of Science and Technology of China Hefei230026 China Deep Space Exploration Laboratory Hefei230088 China Purple Mountain Observatory Chinese Academy of Sciences Nanjing210023 China School of Artificial Intelligence and Data Science University of Science and Technology of China Hefei230026 China Key Laboratory of Optical Astronomy National Astronomical Observatories Chinese Academy of Sciences Beijing100101 China National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka Tokyo181-8588 Japan State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China Hefei230026 China National Optical Astronomy Observatory NSF’s National Optical-Infrared Astronomy Research Laboratory 950 N Cherry Ave. TucsonAZ85726 United States

Wide-field surveys have markedly enhanced the discovery and study of solar system objects (SSOs). The 2.5-meter Wide Field Survey Telescope (WFST) represents the foremost facility dedicated to optical time-domain surveys in the northern hemisphere. To fully exploit WFST’s capabilities for SSO detection, we have developed a heliocentric-orbiting objects processing system (HOPS) tailored for identifying these objects. This system integrates HelioLinC3D, an algorithm well suited for the WFST survey cadence, characterized by revisiting the same sky field twice on the majority of nights. In this paper, we outline the architecture and processing flow of our SSO processing system. The application of the system to the WFST pilot survey data collected between March and May 2024 demonstrates exceptional performance in terms of both temporal efficiency and completeness. A total of 658,489 observations encompassing 38,520 known asteroids have been documented, and 241 newly discovered asteroids have been assigned provisional designations. In particular, 27% of these new discoveries were achieved using merely two observations per night on three nights. The preliminary results not only illuminate the effectiveness of integrating HelioLinC3D within the SSO processing system, but also emphasize the considerable potential contributions of WFST to the field of solar system science. © 2025, CC BY-NC-ND.

关键词： Asteroids

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CO2 monitoring spectrometer with 640x512 Pixel SWIR InGaAs focal plane array

CO2 monitoring spectrometer with 640x512 Pixel SWIR InGaAs f...

引用

2012 International Symposium on Photonics and Optoelectronics, SOPO 2012

作者： Peng, Wei Wu, Shixiang Ding, Lei Wang, Xianghua Hou, Yihe Liu, Jiaqing Tan, Chan Liu, Yuxuan Key Laboratory of Infrared System Detection and Imaging Technology Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai China

ISBN: (纸本)9781457709111

This paper introduces a prototype grating spectrometer measuring atmospheric column carbon dioxide (CO2) with a 640x512 pixel indium gallium arsenide (InGaAs) focal plane array (FPA). The spectrometer achieves the spectral resolutions of 0.1 nm at 1.61μm CO2 band meets the measurement requirement. The structure of the spectrometer including optics and electronics has been described in this paper. The spectrometer features a relatively fast optics, f/1.8, which benefits the sensitivity, and combines a fine slit with a large planar reflective diffraction grating. The performance of the optical design is presented to demonstrate the optical system meets the requirements for spectral resolution and sensitivity. The 640x512 InGaAs FPA with a low noise acquisition system serves to provide low noise spectral signals. The 640x512 InGaAs FPA, 25 μm pixel size, is sensitive to 0.9μm-to-1.7μm short wave infrared (SWIR) band and features a 298 K temperature detectivity, D*, greater than 5×1012 cm -1√Hz/W. © 2012 IEEE.

关键词： Carbon dioxide

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Design and simulation of image compensation control system

Design and simulation of image compensation control system

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2013 International Conference on Mechatronics and Automatic Control Systems, ICMS 2013

作者： Tan, Chan Ding, Lei Key Laboratory of Infrared System Detection and Imaging Technology Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai China

ISBN: (纸本)9783319012728

Image compensation is a key to high resolution imaging. This paper designs and simulates an image compensation control system based on swing pointing mirror. The principle of pointing mirror compensation is presented and the mathematical model of pointing mirror's driving motor is established. Based on this model, a high accurate controller which consists of current loop and velocity loop is designed and simulated. Considering that there is disadvantage of traditional speed PID controller in dynamic performance, which is speed overshoot, the speed loop adopts pseudo derivative feed-forward (PDFF) controller. Theoretical analysis and simulation results show that the designed image compensation control system has good characteristic in following performance, dynamic response and noise resistance. © Springer International Publishing Switzerland 2014.

关键词： Controllers

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Polarization Filtering for Automatic Image Dehazing Based on Contrast Enhancement 9

Polarization Filtering for Automatic Image Dehazing Based on...

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2017 9th IEEE International Conference on Communication Software and Networks (ICCSN 2017)

作者： Xiaoming Li Qinchao Huang Anhui Key Laboratory of Polarization Imaging Detection Technology Army Office Academy

ISBN: (纸本)9781509038237;9781509038220

To overcome the degraded images taken in hazy weather, an adaptive restoration method based on improved contrast enhanced restoration was proposed. Firstly, by quadtree subdivision searching method, the sky area of multichannel polarization image are extracted automatically, and the atmospheric light and degree of polarization are calculated;Second, scene depth information of image are calculated based on contrast enhancement method. Then, atmospheric intensity are thinly restored by guided filter, finally the degradation image are restored. Experimental results have shown that the proposed method can improve fog degradation image and increase definition of the image effectively.

关键词： image dehazing contrast enhancement image restore atmospheric transmissivity

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Target detection for infrared Polarization Image in the Background of Desert 9

Target Detection for Infrared Polarization Image in the Back...

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2017 9th IEEE International Conference on Communication Software and Networks (ICCSN 2017)

作者： Xiaoming Li Qinchao Huang Anhui Key Laboratory of Polarization Imaging Detection Technology Army Office Academy

ISBN: (纸本)9781509038237;9781509038220

infrared polarization imaging detection can be used to obtain not only the polarization state but also the radiation of target. With this method, the target that traditional photometry cannot detect can be settled. The degree and angle of polarization that used in polarization detection reflect different physical properties, and it is seriously redundancy along with intensity of images. A target detection method for polarization infrared image in the background of desert is proposed in allusion to the character. A modified kernel fuzzy clustering algorithm is purposed to cluster infrared images and the polarization images. Then to distinguish target from the background, the object information of clustered infrared and polarization image were combined according to sparse fusion method. Experimental results show that the proposed detection method is lower noise and more clearly details than wavelet fusion and laplacian pyramid fusion.

关键词： infrared polarization kernel fuzzy c clustering sparse fusion pattern recognition

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A pilot survey on globular clusters with the Wide Field Survey Telescope (WFST)

arXiv

引用

arXiv 2025年

作者： Wan, Zhen Fan, Lulu Li, Xuzhi Kong, Xu Wang, Tinggui Zhu, Qingfeng Jiang, Ji-An Cai, Minxuan Xu, Zelin Zheng, Xianzhong Cheng, Jingquan Li, Feng Liang, Ming Liu, Hao Luo, Wentao Tang, Jinlong Wang, Hairen Wang, Jian Xue, Yongquan Yao, Dazhi Zhang, Hongfei Zhao, Wen Department of Astronomy University of Science and Technology of China Hefei230026 China School of Astronomy and Space Science University of Science and Technology of China Hefei230026 China Institute of Astronomy and Astrophysics Anqing Normal University Anhui Anqing246133 China Deep Space Exploration Laboratory Hefei230088 China Tsung-Dao Lee Institute Key Laboratory for Particle Physics Astrophysics and Cosmology Ministry of Education Shanghai Jiao Tong University Shanghai201210 China Purple Mountain Observatory Chinese Academy of Sciences Nanjing210023 China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China Hefei230026 China National Optical Astronomy Observatory [NSF’s National Optical-Infrared Astronomy Research Laboratory 950 N Cherry Ave TucsonAZ85726 United States Institute of Optics and Electronics Chinese Academy of Sciences Chengdu610209 China

We carry out an imaging survey of six globular clusters (GCs) with a limit magnitude to 22 mag at the 5σ level, down to the main sequence stars of the respective cluster, as one of the pilot observing program of the Wide Field Survey Telescope (WFST). This paper present the early results of this survey, where we investigate the tidal characters at the periphery of the clusters NGC 4147, NGC 5024, NGC 5053, NGC 5272, NGC 5904 and NGC 6341. We present the estimated number density of cluster candidates and their spatial distribution. We confirm the presence of tidal arms in NGC 4147 and NGC 5904 and identify several intriguing potential tidal structures in NGC 4147, NGC 5024, NGC 5272, corroborated the elliptical morphology of the periphery of NGC 6341. Our findings underscore the WFST’s capability for probing faint structural features in GCs, paving the way for future in-depth studies, especially for the search of the large scale tidal streams associated with the clusters with the future wide field survey. © 2025, CC BY-NC-ND.

关键词： Telescopes

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Curvature Compensated CMOS Bandgap Reference with Novel Process Variation Calibration Technique

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Journal of Beijing Institute of technology 2018年第2期27卷 182-188页

作者： Jiancheng Zhang Mao Ye Yiqiang Zhao Gongyuan Zhao Tianjin Key Laboratory of Imaging and Sensing Microelectronic Technology Tianjin UniversityTianjin 300072China Tianjin Infrared Imaging Technology Engineering Center Tianjin 300072China

A lowtemperature coefficient（ TC） bandgap reference（ BGR） with novel process variation calibration technique is proposed in this paper. This proposed calibration technique compensating both TC and output value of BGR achieves fine adjustment step towards the reference voltage,while keeping optimal TC by utilizing large resistance to help layout match. The high-order curvature compensation realized by poly and p-diffusion resistors is introduced into the design to guarantee the temperature characteristic. Implemented in 180 nm technology,the proposed BGR has been simulated to have a power supply rejection ratio（ PSRR） of 91 dB@100 Hz. The calibration technique covers output voltage scope of 0. 49 V-0. 56 Vwith TC of 9. 45 × 10^（-6）/℃-9. 56 × 10^（-6）/℃ over the temperature range of-40 ℃-120 ℃. The designed BGR provides a reference voltage of 500 mV,with measured TC of 10. 1 × 10^（-6）/℃.

关键词： bandgap reference voltage process variation resistance-trimming current-calibration curvature compensation temperature coefficient

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Short-wave infrared InGaAs photodetectors and focal plane arrays

引用

Chinese Physics B 2018年第12期27卷 57-63页

作者： Yong-Gang Zhang Yi Gu Xiu-Mei Shao Xue Li Hai-Mei Gong Jia-Xiong Fang Key Laboratory of Infrared Imaging Materials and Detectors Shanghai Institute of Technical PhysicsChinese Academy of Sciences State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences

In this article, unique spectral features of short-wave infrared band of 1 μm–3 μm, and various applications related to the photodetectors and focal plane arrays in this band, are introduced briefly. In addition, the different material systems for the devices in this band are outlined. Based on the background, the development of lattice-matched and wavelengthextended InGaAs photodetectors and focal plane arrays, including our continuous efforts in this field, are reviewed. These devices are concentrated on the applications in spectral sensing and imaging, exclusive of optical fiber communication.

关键词： InGaAs short-wave infrared photodetectors focal plane arrays

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InP-based In_xGa_(1-x)As metamorphic buffers with different mismatch grading rates

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Journal of Semiconductors 2013年第7期34卷 42-46页

作者：方祥顾溢陈星佑周立曹远迎李好斯白音张永刚 State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences Key Laboratory of Infrared Imaging Materials and Detectors Chinese Academy of Sciences

Linearly graded In_xGa_（1-x）As metamorphic buffers with different mismatch grading rates were grown on InP substrate by gas source molecular beam *** temperature photoluminescence spectra show that the sample with lower mismatch grading rate in the buffer has stronger photoluminescence signal,indicating the improved optical *** force microscope images show that the lower mismatch grading rate in the buffer leads to a slightly rougher *** relaxation procedure with two steps in the buffer layers has been observed by X-ray diffraction reciprocal space *** measurements of X-ray diffraction also reveal that the lower mismatch grading rate in the buffer is beneficial for the lattice relaxation and release of residual *** further increase the relaxation degree,a lower mismatch grading rate and composition ＂overshoot＂ are suggested.

关键词： InxGa1-x As gas source molecular beam epitaxy photoluminescence reciprocal space mapping

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