基于CGH多镜定姿定态的离轴光学系统装调方法  

Alignment Method for Off-Axis Optical Systems Based on CGH Multi-Mirror Attitude Determination

作　　者：吴一凡 陈建发[1,2] 崔泽曜 黄浩阳 Wu Yifan;Chen Jianfa;Cui Zeyao;Huang Haoyang(Luoyang Institute of Electro-Optical Equipment,Aviation Industry Corporation of China,Ltd.,Luoyang 471009,Henan,China;National Key Laboratory of Space Based Information Perception and Fusion,Luoyang 471009,Henan,China)

机构地区：[1]中国航空工业集团公司洛阳电光设备研究所,河南洛阳471009 [2]空基信息感知与融合全国重点实验室,河南洛阳471009

出　　处：《光学学报》2024年第3期217-225,共9页Acta Optica Sinica

摘　　要：针对离轴光学系统装调过程中自由度高且互相耦合的问题,提出一种新的离轴自由曲面反射式光学系统装调方法,采用计算全息图(CGH)实现多镜共基准定姿定态,解耦合系统各镜片的装调自由度,显著降低系统装调复杂度;分析CGH用于定姿定态时的定位精度,提高系统装调精度和效率,适应不同构型的离轴光学系统。利用上述方法,完成口径为210 mm、视场为2°×2°的近红外长波红外双波段离轴反射式光学系统装调,全视场波像差RMS小于0.126λ(λ=632.8 nm),达到设计预期,装配周期短,成像质量优良。Objective The development trend of onboard electro-optical systems towards multifunctionality,high performance,and light weight poses higher demands on the development of optical systems.Reflective optical systems are widely employed in various types of onboard electro-optical devices due to their broad bandwidth and compact working characteristics,and they face challenges such as obscuration of secondary mirrors,limited field of view,and low optimization degrees in traditional coaxial reflective systems.Off-axis three-mirror reflective optical systems with freeform surfaces can address these issues.However,the development and maturity of freeform surface design and manufacturing techniques pose challenges to freeform surface shape measurement and system alignment.In previous studies,computer-generated holograms(CGHs)are adopted for single mirror shape measurement,but there is limited publicly available information on multi-mirror shape measurement with CGHs and their joint baseline design.Methods We propose a method for CGH joint baseline design of multi-mirror shape measurement to enable independent high-precision positioning of each mirror during alignment.The core idea is to combine detection and design to ensure highprecision shape measurement and achieve high-precision positioning and stabilization of multiple mirrors.The specific process of the joint baseline design for multi-mirror CGHs is as follows(Fig.1).1)The input parameters for the mirror shape are set,including posture parameters and surface parameters.2)The initial point for CGH posture optimization is calculated based on the parameters.Additionally,CGH posture parameters(tilt and distance from the measured surface)are optimized to ensure the integrity and moderate size of the holographic areas for primary mirror and third mirror.3)Additional holographic areas are designed based on posture parameters,including rough alignment areas,angular alignment areas,and interference order marking areas.The angular alignment area utilizes a reflective grating

关 键 词：光学设计 计算全息图 离轴三反 自由曲面 

分 类 号：O438[机械工程—光学工程] O436[理学—光学] O439[理学—物理]