激光与光电子学进展, 2020, 57 (9): 092202, 网络出版: 2020-05-06   

基于自由曲面的离轴三反光学系统设计方法研究 下载: 1365次

Design of Off-Axis Three-Mirror Optical System Based on Free-Form Surface
作者单位
1 光电控制技术重点实验室, 河南 洛阳, 471000
2 中国航空工业集团公司洛阳电光设备研究所, 河南 洛阳, 471000
摘要
离轴反射光学系统克服了传统折射系统的材料限制,具有大口径、小体积、轻量化、无色差等优点,随着自由度极高的自由曲面的大量应用,校正了离轴系统引入的非对称像差,成为了研究的热点。针对离轴三反初始结构求解复杂的问题,介绍了几种离轴反射系统的常用设计方法,从设计原理上将其归结为两类思路:一是根据像差理论先建立同轴系统的初始结构,通过对光学系统的离轴优化实现无中心遮拦;二是直接构建无中心遮拦的简单光学系统,在优化过程中利用复杂面型进行像差优化。根据两类设计原理对不同结构的光学系统进行了实例设计,优化过程和像质评价结果表明,两类设计方法都能够满足设计指标,仅优化过程不同,其构建结果几乎具有等价性。其中第一类方法在像差优化中更具优势,适用于离轴角较小的光学系统;第二类方法避免了复杂的离轴优化,适用于紧凑型光学系统。
Abstract
The off-axis reflective optical system overcomes the material limitation of traditional refractive system and has the advantages of large aperture, small volume, lightweight and non-chromatic aberration. With the extensive application of freeform surface, which has very high degree of freedom, it has corrected the asymmetric aberration introduced by off-axis system, which has become a research hotspot. Aiming at the complex problem of solving the off-axis three-mirror initial structure, this paper introduces several common design methods of off-axis reflection system, which can be summarized as two ideas from the design principle: first, the initial structure of coaxial system is established according to aberration theory, and the off-axis optimization of optical system is carried out to achieve non-central occlusion; the second is to directly construct a simple optical system without central obscuration, using the complex surface for aberration optimization in the optimization process. According to the two kinds of design theory, the optical systems with different structures are designed as examples. The optimization process and image quality evaluation function show that both methods can meet the design targets, but the optimization process is different, and the construction results are almost equivalent. Among them, the first method is more advantageous in aberration optimization, which is suitable for optical systems with small off-axis angle; the second method avoids complex off-axis optimization and is suitable for compact optical systems.

李俊阳, 李文强, 龙尤, 周亮, 高阳. 基于自由曲面的离轴三反光学系统设计方法研究[J]. 激光与光电子学进展, 2020, 57(9): 092202. Junyang Li, Wenqiang Li, You Long, Liang Zhou, Yang Gao. Design of Off-Axis Three-Mirror Optical System Based on Free-Form Surface[J]. Laser & Optoelectronics Progress, 2020, 57(9): 092202.

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