第19卷第12期 2011年12月
文章编号
1004-924X(2011)12-2813-08
光学精密工程
Optics and Precision Engineering
Vol.19No.12
Dee, 2011
基于光学自由曲面的离轴三反光学系统
薛栋林*，郑立功，张峰
（中国科学院长春光学精密机与物理研究所
中国科学院光学系统先进制造技术重点实验室，吉林长春130033）
摘要：为了研制长焦距大视场离轴三反空间光学系统，描述了自由曲面光学数理模型，设计了基于自由曲面的离轴三反光学系统。针对焦距为4500mm，成像视场角为11，系统总长与焦距的比值为1/3的光学系统，对比分析了传统离轴三反光学系统和次镜为自由曲面的离轴三反光学系统的关键性能。在提出的光学系统中次镜采用自由曲面设计，提升了光学系统的像差平衡能力；最终选用相对孔径为1/9.5的设计方案，使光学系统全视场率均波像差优于0.030入（入= 632.8nm），平均传递函数优于0.434(71.4lp/mm），接近衔射极限；在同等条件下系统设计传递函数比传统离轴三反系统提高5%以上。优化设计后光学系统自由曲面次镜与理论球面偏差为1.1入，采用定制的标准球面镜结合基于数字样板的非零位检测方法可完成面形实时高精度检测，解决了大口径凸自由曲面检测的难题。结果表明，采用基于自由曲面
次镜的空间光学系统，其有体积小、技术可实现性强、波像差和传递函数等关键性能优越等优点。关键词：光学设计；长焦距大视场光学遍感器；离轴三反光学系统；自由曲面反射镜
中图分类号：TH703
文献标识码：A
doi;10. 3788/OPE, 20111912. 2813
Off-axisthree-mirrorsystembasedonfreeformmirror
XUE Dong-lin',ZHENG Li-gong,ZHANG Feng
(KeyLaboratory of Optical System Aduanced Manufacturing Technology,Changchun Institute of Optics,FineMechanics andPhysics,ChineseAcademy of Sciences,Changchun130033,China)
*Correspondingauthor,E-mail:uedi@ciomp.ac.cn
Abstract: A freeform off-axis three-mirror system based on a freeform mirror was designed for the long focal length and wide-field off-axis three-mirror system in a space telescope. To obtain a system with a focal length of 4 500 mm, field of view of 11° and the ratio of the total length of system and the focal length in 1/3, the design and performance between traditional off-axis three-mirror system and freeform off-axis three-mirror system were compared. In the designed optical system, the freeform mirror was introduced to the secondary mirror to enhance system optimization and improve the balance capacity for optical aberration. After the comparison and optimization, the relative aperture of 1/9. 5 was chosen. In the system, the average of wavefront error of all field of view is better than O, 030>(= 632.8 nm), and the average of the Modulation Transform Function(MTF) of all field of view is grea-ter than 0. 434(71. 4 lp/mm) that is close to the diffraction limitation. Furthermore,the MTF has im
收稿日期：2011-05-10；修订日期：2011-06-30.
基金项目：国家白然科学基金重点项目（No.61036015)：国家863高技术研究发展计划资助项目（No.O8663NJ090)；国
防创新基金资助项目(CXJJ-11-M05)