Mr. Kedi Xie Profile

Kedi Xie

at Shanghai Institute of Optics and Fine Mechanics CAS

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Publications (2)

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Proceedings Article | 26 July 2024 Paper

Optimization design and implementation of eccentric tracking pendulum mirror for satellite-borne laser communication

Fan Fang, Xia Hou, Yuan Wan, Kedi Xie, Yingxia Huang, Shaowen Lu, Wenbing Xia, Bang Pang

Proceedings Volume 13189, 131890W (2024) https://doi.org/10.1117/12.3032628

KEYWORDS: Pendulums, Mirrors, Space mirrors, Design, Laser soldering, Mirror surfaces, Temperature control, Laser communications, Satellites, Satellite communications

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Currently, the construction of low-orbit satellite constellation is booming in the world. To make full use of carrier resources and improve launch efficiency, the extra-vehicular launch envelope size of spaceborne laser communication payload need to be smaller and flatter. Tracking mirror is the decisive factor of launch size because its rotating mechanism of external load and itself cannot be packed in to the cabin. . Therefore, we propose the design architecture of the tracking mirror with eccentric rotation axis and independent temperature control. the scanning space of the short side during the movement is reduced by tilting the rotation axis of the pendulum mirror to one side,. To decrease the height of the support axis for the pendulum mirror and minimize the overall launch envelope, the mirror is positioned horizontally during the launch stage. The design of the eccentric pendulum mirror utilizes rigid body isolation and radiation temperature control. It considers various factors including material properties, adhesive layers, and film layers. Additionally, it implements multi-point flexible installation and lens radiation temperature control techniques, while fine-tuning parameters through finite element analysis. The design achieved a 67.5mm reduction in the size of the transmitting envelope, accounting for 43% of the total height of the original mechanism. In the temperature range of 23~33℃, the RMS value of the pendulum mirror type changes to (1/166λ)/℃, which shows a linear trend. Lab test results show that the surface RMS value changes to (1/161λ)/℃ in the range of 21~32℃, which aligns well with the simulation value. The pendulum mirror has passed the mechanical and thermal vacuum environment test and achieved the design requirements, ensuring the smooth delivery of loads and on-orbit operation. Additionally, it introduces an innovative design optimization method for space eccentric tracking pendulum mirrors.

Proceedings Article | 12 March 2021 Paper

Investigation on irradiated characteristics of Tm-doped gain fiber

Yexi Qu, Jing Liu, Zhenxing He, Ting Yu, Kedi Xie, Tieqiang Song, Mengmeng Tao, Minbo Liu, Chunlei Yu, Xisheng Ye

Proceedings Volume 11763, 117639D (2021) https://doi.org/10.1117/12.2587691

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We demonstrated a stable fiber laser setup for real-time monitoring of Tm-doped gain fibers while being exposed to gamma-rays. The output power is about 10W, and the power stability of the system is ±0.25% based on the 12-hour continuous measurement. By using this laser setup and ⁶⁰Co gamma-ray irradiation source, the dose rate effect and total dose effect on the typical Tm-doped fiber specimens under water-cooling condition were experimentally studied. According to the obtained experimental results on five kinds of Tm-doped gain fiber from different R and D institutions and batches at home and abroad, the output power declines monotonously with the total irradiation dose increasing. During a dose rate range of 0.05 to 0.5 rad(Si)/s, the dose rate effects of Tm-doped gain fiber samples basically disappear, which means the differences of power degradation under different dose rate are almost invisible.

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