星载激光雷达激光器热控技术研究  

Research on Thermal Control Technology of Spaceborne LiDAR Laser

作　　者：万渊[1,3] 陈菡 杜嘉旻[2] 孟洁 谢可迪 王明建[1] 马秀华 刘继桥[1,3] 侯霞[1,3] 陈卫标[1,3] Wan Yuan;Cheng Han;Du Jiamin;Meng Jie;Xie Kedi;Wang Mingjian;Ma Xiuhua;Liu Jiqiao;Hou Xia;Chen Weibiao(Space Laser Engineering Department,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;Shanghai Institute of Satellite Engineering,Shanghai 201109,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院上海光学精密机械研究所航天激光工程部,上海201800 [2]上海卫星工程研究所,上海201109 [3]中国科学院大学材料与光电研究中心,北京100049

出　　处：《中国激光》2023年第14期35-42,共8页Chinese Journal of Lasers

基　　金：中国科学院战略性重点研究计划(XDA19090100)。

摘　　要：为了满足星载大气探测激光雷达在轨应用需求,对该系统采用的空间大能量脉冲固体激光器进行了空间环境下的热控设计仿真及试验研究。首先根据激光载荷整体布局以及轨道特性参数分析并计算了激光器外部空间热环境,随后介绍了激光器构型及热设计,然后利用热传导以及空间热辐射理论建立了热分析模型,开展了激光器在轨热设计及仿真,并通过空间热真空环境试验验证了热控方案。激光器在轨工作温度波动优于±0.033℃,激光器内部关键器件大功率的激光放大器模块温度低于28℃,实现了大能量脉冲固体激光器在轨超高精度控温,满足了激光器在轨稳定运行工作的使用要求,为激光雷达在轨正常工作提供了重要保障。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 high-energy single beam pulsed laser with frequency stabilization at three wavelengths(532 nm/1064 nm/1572 nm).High-power space lasers typically produce a large amount of heat during operation;however,heat concentration in the laser causes the temperature of the laser diode(LD),which is a key device in the laser,to rise,resulting in a drift in the LD output wavelength that causes the overall efficiency of the laser to decrease or fail.Simultaneously,large amounts of heat also increases the temperature of the internal optical structure,resulting in a large temperature gradient,which causes the main laser structure to deform and stress accumulation inside the core optical components,thereby resulting in extremely serious effects on the laser output power,beam pointing,divergence angle,and polarization characteristics.An efficient and stable thermal control technology is one of the core technologies in the development of space laser loads.To meet the requirements of on-orbit applications,it is necessary to design,simulate,and test the thermal control system of the space high-energy pulsed solid-state laser used in the system.Methods Generally,the LiDAR is operated on a sun-synchronous orbit with an orbital altitude of 705 km and an orbital inclination of 98.1°.The laser is preferably installed inside the main body of the LiDAR and insulated from its main structure,and the connection is done in series through a heat pipe to transfer heat to a radiant cooling plate(Fig.4).The thermal control states of the main and standby lasers are consistent when operated separately.Simultaneously,a single laser can transfer the heat to the second laser through a heat pipe to ensure an effective storage temperature.The temperature fluctuation and temperature gra

关 键 词：激光器 星载激光雷达 空间激光器 热设计 传导辐射制冷 

分 类 号：TN248.1[电子电信—物理电子学]