光学学报, 2020, 40 (22): 2206001, 网络出版: 2020-10-25
像差对空间激光通信系统发射光束远场分布的影响 下载: 988次
Influence of Aberration on Far-Field Distribution of Laser Beam Emitted by Space Laser Communication System
光通信 像差 远场分布 标量衍射理论 相似度系数 optical communications aberration far-field distribution scalar diffraction theory similarity coefficient
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3 μrad、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。
Abstract
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 is λ, the allowable pointing deviation is 3 μrad, 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.
姜承志, 张文睿, 汪波, 张若凡, 朱晓程, 张锦龙, 裘磊, 葛照琪, 陈伟军. 像差对空间激光通信系统发射光束远场分布的影响[J]. 光学学报, 2020, 40(22): 2206001. Chengzhi Jiang, Wenrui Zhang, Bo Wang, Ruofan Zhang, Xiaocheng Zhu, Jinlong Zhang, Lei Qiu, Zhaoqi Ge, Weijun Chen. Influence of Aberration on Far-Field Distribution of Laser Beam Emitted by Space Laser Communication System[J]. Acta Optica Sinica, 2020, 40(22): 2206001.