Prof. Jinsong Zhao Profile

Prof. Jinsong Zhao

at Kunming Institute of Physics

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Proceedings Article | 13 November 2024 Paper

Design of a dual-band dual-mode optical system for visible and near-infrared spectrums

Jingpeng Chen, Liang Tao, Jinsong Zhao, Hongxing He, Qiping Liu, Lizhu Kang, Xin Tang

Proceedings Volume 13280, 1328006 (2024) https://doi.org/10.1117/12.3046044

KEYWORDS: Modulation transfer functions, Visible radiation, Beam path, Design, Beam splitters, Prisms, Optical design, Reflection, Distortion, Combined lens-mirror systems

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In response to the application requirements for long-distance detection, identification, and ranging of a near-space UAV platform, this paper designs a common-aperture visible and near-infrared dual-band dual-mode optical system. By utilizing imaging in both the near-infrared and visible light bands, it ensures the richness of information obtained during the daytimes and takes advantage of the near-infrared's ability to penetrate fog and detect weak light for imaging, while also integrating a laser ranging function. The front end of the optical system adopts a common-aperture catadioptric structure, and the rear end uses a beam splitter to divide the optical path into a transmitted and reflected branch. The transmitted optical path is designed based on an InGaAs detector array of 1280×1024 (5μm), with a working wavelength of 0.4μm to 1.7μm. The focal length of the transmitted light path is 650mm, and the F-number is 4, which is used for detection and identification of long-distance targets. The reflected optical path is the laser reception optical path, with a working wavelength of 1.535μm, used to achieve long-distance laser ranging. Compared with parallel plate beam splitting, the use of a cube beamsplitter in this system eliminates the prerequisite for parallel incident light, thereby streamlining the optical path and contributing to the overall compactness and lightweight nature of the system. The optical system has achieved passive heat dissipation in the temperature range of minus 70 degrees Celsius to 65 degrees Celsius. The system's Modulation Transfer Function (MTF) remains impressively close to the diffraction limit across this entire temperature spectrum. The weight of the optical system is 565g, and the external dimensions are 235mm. While meeting the stringent performance requirements of long-distance laser ranging and dual-band detection, the advantages of miniaturization, lightweight, and integration technology are evident.

Proceedings Article | 9 November 2018 Paper

Preparation and optical properties of transparent polycrystalline ZnS bulk materials

Shaohua Wu, Jinsong Zhao, YueJin Zhao, Wenming Yang, Haijuan Cheng, Jie Jiang, Maozhong Li

Proceedings Volume 10826, 108261I (2018) https://doi.org/10.1117/12.2501910

KEYWORDS: Zinc, Chemical vapor deposition, Crystals, Annealing, Transmittance, Optical properties, Particles, Absorption, Infrared radiation, Argon

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The transmittance of chemical vapor deposition (CVD) ZnS can be effectively improved through the processing of hot isostatic pressing (HIP) in inert gas, especially in the waveband of visible light and near infrared. In general, the size of the particles of the polycrystalline ZnS bulk material can be increased after the processing of HIP. This change can definitely affect the optical properties and mechanical properties of the material. In this paper, a two-step method was applied to improve preparation of transparent polycrystalline ZnS bulk materials. The first step was the growth of polycrystalline ZnS through dynamic CVD. Then the grown polycrystalline ZnS bulk materials was annealed in inert gas at 800~900°C for 10～50 h. Experimental results showed that the optical properties and mechanical properties of the materials have been significantly improved. The average transmission rate of the materials was over 74% in the wavebands 8~12 μm and was over 70% in the mid-infrared 3~5 μm. The absorption peak of the materials at 6 μm attributed to Zn-H complex and S vacancy was obviously decreased. Furthermore, results of imaging experiments showed that lenses made of the annealed transparent polycrystalline ZnS bulk materials has excellent performance in optical properties and modulation transfer function (MTF).

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