Objective The first international aerosol carbon detection LiDAR (ACDL), which was developed by Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, was successfully launched and has been continuously operated in orbit since April 2022. This Lidar uses a highenergy single beam pulsed laser with frequency stabilization at three wavelengths (532 nm/1064 nm/ 1572 nm). Highpower space lasers typically produce a large amount of heat during operation; however, heat concentration in the laser 研究论文 第 50 卷 第 14 期/2023 年 7 月/中国激光 directions (Fig. 8). Hightemperature and lowtemperature tests are conducted under thermal vacuum equilibrium conditions, where the temperature of the laser internal amplifier is maintained between 18.9 ℃ and 26.8 ℃ , the temperature of the laser shell is maintained between 19.2 ℃ and 21.5 ℃ , and the maximum temperature fluctuation is ± 0.67 ℃ (Fig. 11). After the LiDAR is launched into orbit, an onorbit test is conducted and the laser and laser thermal control system operate normally. By analyzing the correlation between the laser energy fluctuation and temperature measurement value, the laser energy fluctuation cycle is found to be consistent with the external heat flow fluctuation cycle. Additionally, the laser telemetry energy fluctuation is 4.9%, and the temperature control parameters of the laser external heater are adjusted using the onorbit injection number to improve the temperature control accuracy of the laser during the onorbit test. For the onorbit thermal control parameter optimization process, the duty cycle of the heat pipe heater is reduced by reducing the temperature threshold of the heat pipe heater and opening the laser shell temperature compensation backup heater to increase the temperature control threshold of the heat pipe mounting surface heater. After onorbit adjustment, the temperature fluctuation of the laser in orbit is ± 0.033 ℃ (Fig. 12), and the fluctuation of laser energy telemetry is 1.2%.Conclusions Using simulation calculations and space environment thermal experiments, the design verification index is completed to ensure the usage requirements are met. After the LiDAR is launched into orbit, the laser thermal control system operates normally and meets the longterm stable working requirements of lasers in orbit. Therefore, the laser thermal control technology used in this study is reasonable, feasible, and has high reliability and design margin, making it an important reference for the thermal design of highpower space laser loads.
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