微弧度量级远场发散角光束发射系统的设计与实现  

Design and Development of Beam Transmitting System with Far-Field Beam Divergence Angle of Micro-Radian Dimension

作　　者：况耀武[1,2] 何志平 袁立银[1] 张亮[1] 舒嵘[1] Kuang Yaowu;He Zhiping;Yuan Liyin;Zhang Liang;Shu Rong(Key Laboratory of Space Active Opto-Electronics Technology, Shanghai Institute of Technical Physics Chinese Academy of Sciences, Shanghai 200083, China;University of Chinese Academy of Sciences, Beijing 100049, China)

机构地区：[1]中国科学院上海技术物理研究所中国科学院空间主动光电技术重点实验室,上海200083 [2]中国科学院大学,北京100049

出　　处：《中国激光》2018年第6期141-146,共6页Chinese Journal of Lasers

基　　金：国家自然科学基金(61302181)

摘　　要：建立了发射光束通过带有波像差的望远镜系统后的远场光斑分布数学模型,采用数值计算,结合Monte Carlo方法分析了波像差方均根(RMS)值对发射光束远场发散角的影响,据此确定望远镜波像差的容差,以实现特定发射光束的远场发散角。结果表明:对于采用偏轴发射方案的激光通信系统,当望远镜的波像差RMS值优于0.13λ(λ为光束的波长)时,发射光束远场发散角小于10μrad,当RMS值小于0.2λ时,发射光束远场发散角小于16.2μrad,且仍有60%的概率小于10μrad。在实验室中,不同温度下望远镜波像差及其对应的发射光束远场发散角的测试结果很好地验证了以上分析结果。A mathematical model of the far-field beam distribution is built after the transmitted beam passes through the telescope with wave-front error.The effect of root mean square（RMS）value of wave-front error on the divergence angle of the transmitted beam is analyzed by numerical calculation combined with Monte Carlo method.Based on this,the tolerance of the telescope wave-front error required by the far-field divergence angle of the transmitted beam is determined.The analysis results show that for the laser communication system which the transmitted beam is off-axis on the telescope pupil,the far-field divergence angle is smaller than 10μrad when the RMS of wave-front error is smaller than 0.13λ（λis the light wavelength）.The far-field divergence angle is smaller than 16.2μrad when the RMS is smaller than 0.2λand the probability of the divergence angle smaller than 10μrad is 60%.The testing results of the wave-front errors of the telescope at different temperatures and the corresponding far-field divergence angles of the transmitted beams are well coincided with the analysis results.

关 键 词：光通信 激光传输 远场发散角 ZERNIKE多项式 激光通信 

分 类 号：O436[机械工程—光学工程]