Mr. Dong-liang Shi Profile

Dong-liang Shi

at Beijing Institute of Space Mechanics & Electricity

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Proceedings Article | 24 November 2021 Paper

A Solc liquid crystal tunable filter

Tingmei Yang, Minlong Lian, Dongliang Shi

Proceedings Volume 12064, 120640C (2021) https://doi.org/10.1117/12.2606148

KEYWORDS: Liquid crystals, Tunable filters, Optical filters, Fluctuations and noise, Crystals, Multispectral imaging, Birefringence, Polarizers, Linear polarizers, Linear filtering

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Liquid crystal tunable filter utilizes the electrically controlled birefringence effect of liquid crystal material to achieve rapid tuning of the central wavelength of the transmission spectrum. In this paper, we propose a fan Solc liquid crystal tunable filter with 8-stage structure, and the thickness of the nematic liquid crystal material in each liquid crystal cell is 3 μm. We compile a program according to Jones matrix calculation method to simulate and analyze the 8-stage Solc liquid crystal tunable filter. It can be clearly derived from the simulation results that this liquid crystal tunable filter can freely tune the center wavelength of the transmitted light in the spectral range of 400 nm to 800 nm. When the transmission peaks of the liquid crystal tunable filter are at 450 nm, 540 nm, 630 nm, and 750 nm, the full width at half maximum of the transmission spectrum are 45 nm, 54 nm, 63 nm, and 75 nm, respectively. What’s more, when the thickness of the liquid crystal material decreases from 10 μm to 6μm, the free spectral range of the 8-stage Solc liquid crystal tunable filter increases. We also performed a simulation experiment on 4, 8, 12 and 16-stage fan Solc liquid crystal tunable filters.The thickness of the liquid crystal material in these Solc-type liquid crystal tunable filters is still 3 μm. As the the number of stages of liquid crystal tunable filters increases, the full width at half maximum decreases gradually and is approximately inversely proportional.

Proceedings Article | 5 November 2020 Paper

Feature of spaceborne laser communication telescope isolation

Dong-liang Shi, Rui-min Fu, Jian-feng Liu, Bin Hu

Proceedings Volume 11562, 115620R (2020) https://doi.org/10.1117/12.2579659

KEYWORDS: Mirrors, Telescopes, Laser communications, Reflectivity, Off axis mirrors, Reflector telescopes, Optical telescopes, Reflection, Bidirectional reflectance transmission function

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Spacebornelaser communication system utilize laser to transfer information, which can realize star to star, star to earth communication. It hasthe advantage of wide bandwidth, high anti-jamming capability, good secrecy performance, small size and weight, and lower power dissipation. Laser communication telescope, which is use for laser beam alignment, is the main part of spaceborne laser communication system to realize long distance transmission. As transmit-receive integration is the mainstream form of spaceborne laser communication system in current, isolation become a kernel index which determined the signal-to-noise ratio and transmission distance. Optical telescope of coaxial two-mirrorreflective structure and off-axis three mirror reflective structure were built, and stay light analysis was done on both kind of laser communication telescope to get the isolation. The results show that the isolation of coaxial two-mirror reflective optical telescope is 62dB and the isolation of off-axis three mirror optical telescope is 70dB. Furthermore, the results show that mirror scatter is the dominant influence factor of isolation. Through comparative analysis of two forms of optical system, under the same condition, off-axis three mirror optical telescope has a better performance in isolation.

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