500 mm口径星地激光通信地面接收端系统设计  

Design of Ground Receiver System For 500 mm Aperture Satellite-Ground Laser Communication

作　　者：李聪[1] 倪小龙[1] 于信[1] 刘骏 白素平[1] 石利霞[1] Li Cong;Ni Xiaolong;Yu Xin;Liu Jun;Bai Suping;Shi Lixia(College of Optoelectronic Engineering,Changchun University of Science and Technology,Changchun 130022,Jilin,China)

机构地区：[1]长春理工大学光电工程学院,吉林长春130022

出　　处：《激光与光电子学进展》2024年第7期202-211,共10页Laser & Optoelectronics Progress

基　　金：国家自然科学基金项目(62275033);国家自然科学基金青年基金资助项目(62205032);吉林省科技发展计划项目(20210201139GX);吉林省教育厅科学技术研究项目(JJKH20220749KJ)。

摘　　要：为提高星地激光通信地面接收端探测灵敏度和分辨能力,减少信标光捕获时间和难度,基于星地激光通信链路和设计方案,结合自适应光学(AO)技术,设计了一套500 mm口径的星地激光通信地面接收端系统。该系统采用库德光路、共口径分光探测形式,包含卡塞格林天线、倾斜镜精跟踪、AO超精跟踪、AO波前探测等4个单元。天线物镜组采用同轴卡塞格林结构,结合折射镜组构成开普勒望远结构,兼顾体积和长出瞳距的需求。在精跟踪倾斜镜和AO倾斜镜之间设计了4f系统,解决校正光轴时的瞳面漂移问题。在波前探测器和变形镜之间设计了双远心系统,构建两者共轭关系,降低波前探测的轴向误差影响。采用光学被动式方法对4个单元进行消热差设计,提高系统温度适应性。最终实验结果表明:在10℃~30℃范围内,各单元波像差均优于1/10λ(λ=632.8 nm),满足设计要求,具有一定借鉴价值和工程意义。In order to enhance the sensitivity and resolution of the ground receiver for satellite-based laser communication,as well as simplify the acquisition process for beacon light,a 500 mm aperture ground receiver system is developed.This system is designed based on the link and design scheme of satellite-based laser communication,incorporating adaptive optics(AO)technology.It consists of four units:Cassegrain antenna with common aperture spectral detection,precision tracking tilt mirror,ultra-precision tracking AO,and AO wavefront detection.The antenna objective utilizes a coaxial Cassegrain structure combined with a refractor group to form a Kepler telescopic structure that considers volume and pupil distance requirements.To address optical axis correction issues causing pupil plane drift,a 4f system is implemented between the precise tracking tilt mirror and AO tilt mirror.Additionally,a double telecentric system is employed between the wavefront detector and deformable mirror to establish conjugate relationship and minimize axial error in wavefront detection.Optical passive methods are utilized in designing these four units to improve temperature adaptability of the system.Experimental results demonstrate that each element’s wave aberration falls within 1/10λ(λ=632.8 nm)range at temperatures ranging from 10℃to 30℃,meeting design specifications while offering valuable references for engineering applications.

关 键 词：星地激光通信 库德光路 消热差 双远心光路 自适应光学 

分 类 号：TH74[机械工程—光学工程]