一种自由曲面光学系统初始结构设计方法  

Design Method for Initial Structure of Freeform Surface Optical System

作　　者：罗越 李立波[1] 冯玉涛[1] 赵珩翔 李西杰 白清兰[1] Luo Yue;Li Libo;Feng Yutao;Zhao Hengxiang;Li Xijie;Bai Qinglan(Key Laboratory of Spectral Imaging Technology,Xi'an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences,Xi’an,Shaanxi 710119,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院西安光学精密机械研究所光谱成像技术重点实验室,陕西西安710119 [2]中国科学院大学,北京100049

出　　处：《光学学报》2021年第24期221-227,共7页Acta Optica Sinica

基　　金：国家自然科学基金(41005019);中科院西部青年学者(XAB2016A07);中国科学院西部之光交叉创新团队项目(E1294301);陕西省自然科学基础研究计划(2019JQ-931)。

摘　　要：针对自由曲面光学系统设计中初始结构难以取得的问题,提出了一种自由曲面光学系统的直接构建方法。将理想物像关系和费马原理作为单模块迭代的判据,利用逐点光线追迹的方式可直接从平面无光焦度光学系统中获得具有良好优化潜力的初始结构。在迭代的不同阶段,可通过采样疏密不同的特征光线的方式加快初始结构求解速度。在得到初始光学结构后,可利用光学设计软件进一步优化像质。利用所提方法实现了空间尺寸小于40 mm×70 mm×60 mm的紧凑型150 mm焦距离轴两反光学系统的设计,验证了所提方法在自由曲面光学系统设计中的可行性。A direct construction method for freeform surface optical system is proposed to address the problem that the initial structure is difficult to obtain in the design of such system.With the ideal object-image relationship and the Fermat principle as the criteria of single module iteration,an initial structure with favorable optimization potential can be directly obtained from a plane optical system without optical power by tracing light rays point by point.It can be solved faster by sampling feature light rays with different densities at different iteration stages.After the initial optical structure is obtained,optical design software can be used to further optimize the image quality.A compact off-axis two-mirror optical system with a 150 mm focal length and a physical size less than 40 mm×70 mm×60 mm is designed by the proposed method,which verifies the feasibility of this method in the design of freeform surface optical systems.

关 键 词：光学设计 几何光学 离轴两反系统 光学自由曲面 

分 类 号：O439[机械工程—光学工程]