像差对空间激光通信系统发射光束远场分布的影响  

Influence of Aberration on Far-Field Distribution of Laser Beam Emitted by Space Laser Communication System

作　　者：姜承志 张文睿[1,2] 汪波 张若凡[1] 朱晓程 张锦龙 裘磊 葛照琪[1] 陈伟军 Chengzhi Jiang;Wenrui Zhang;Bo Wang;Ruofan Zhang;Xiaocheng Zhu;Jinlong Zhang;Lei Qiu;Zhaoqi Ge;Weijun Chen(Laser Business Division,China Academy of Space Technology(Xi'an),Xi'an,Shannxi 710000,China;School of Physics and Optoelectronics Engineering,Xidian University,Xi'an,Shannxi 710071,China)

机构地区：[1]中国空间技术研究院西安分院激光事业部,陕西西安710000 [2]西安电子科技大学物理与光电工程学院,陕西西安710071

出　　处：《光学学报》2020年第22期17-24,共8页Acta Optica Sinica

基　　金：国家自然科学基金青年基金(62001375);装备预研航天科技联合基金(6141B060301)。

摘　　要：基于菲涅耳标量衍射理论,推导了离焦状态下激光发射系统远场光斑分布的解析式,提出了一种基于相似度系数的采样间隔寻优法。用最佳采样间隔得到的数值仿真结果与解析计算结果的偏差小于0.04%。采用傅里叶变换法仿真了存在像差时的远场光斑分布情况,并分析了角位移、发散角、增益等关键参数对光场分布的影响。当激光波长为λ、指向允许偏差为3μrad、中心增益裕量为3 dB时,基于公差分配理论得到离焦、倾斜、球差、慧差、像散的容差需分别小于等于0.36λ、0.07λ、0.43λ、0.13λ、0.5λ。Based on Fresnel scalar diffraction theory,the analytical formula of far-field spot distribution of laser emission system in defocused state is derived,and a sampling interval optimization method based on similarity coefficient is proposed in this paper.The deviation between the analytical results from optimal sampling interval and numerical simulation is less than 0.04%.Fourier transform method is used to simulate the far-field spot distribution in the presence of aberration,and the influence of key parameters such as angular displacement,divergence angle,and gain on the light field distribution is analyzed.When the laser wavelength isλ,the allowable pointing deviation is 3μrad,and the center gain margin is 3 dB,based on the tolerance allocation theory,the tolerances of defocus,tilt,spherical aberration,coma aberration,and astigmatism should be less than or equal to 0.36λ,0.07λ,0.43λ,0.13λ,and 0.5λ,respectively.

关 键 词：光通信 像差 远场分布 标量衍射理论 相似度系数 

分 类 号：E963[军事—军事通信学]