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

doi:10.3788/OPE.20111912.2813

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基于光学自由曲面的离轴三反光学系统

现代应用光学 | 更新时间：2020-08-12

- 基于光学自由曲面的离轴三反光学系统
- Off-axis three-mirror system based on freeform mirror
- 光学精密工程 2011年19卷第12期页码：2813-2820
- 作者机构：
  
  中国科学院长春光学精密机械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
- 作者简介：
- 基金信息：
  
  国家自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-M
- DOI：10.3788/OPE.20111912.2813
  中图分类号： TH703
- 收稿日期：2011-05-10，
  
  修回日期：2011-06-30，
  
  网络出版日期：2011-12-25，
  
  纸质出版日期：2011-12-25
- 稿件说明：
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薛栋林, 郑立功, 张峰. 基于光学自由曲面的离轴三反光学系统[J]. 光学精密工程, 2011,19(12): 2813-2820

XUE Dong-lin, ZHENG Li-gong, ZHANG Feng. Off-axis three-mirror system based on freeform mirror[J]. Editorial Office of Optics and Precision Engineering, 2011,19(12): 2813-2820
薛栋林, 郑立功, 张峰. 基于光学自由曲面的离轴三反光学系统[J]. 光学精密工程, 2011,19(12): 2813-2820 DOI： 10.3788/OPE.20111912.2813.

XUE Dong-lin, ZHENG Li-gong, ZHANG Feng. Off-axis three-mirror system based on freeform mirror[J]. Editorial Office of Optics and Precision Engineering, 2011,19(12): 2813-2820 DOI： 10.3788/OPE.20111912.2813.

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4 500 mm

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

使光学系统全视场平均波像差优于0.030(=632.8 nm)

平均传递函数优于0.434(71.4 lp/mm)

接近衍射极限;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

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

具有体积小、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。

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 0.030(=632.8 nm)

and the average of the Modulation Transform Function(MTF) of all field of view is greater than 0.434(71.4 lp/mm) that is close to the diffraction limitation. Furthermore

the MTF has im- proved more than 5% compared to that of traditional TMA system and the departure of the secondary freeform mirror and theoretical spherical surface is only 1.1(=632.8 nm). The highly precision testing can be accomplished only by a standard sphere combined with the non-null testing method based on digital mask

which solves the problem of large-aperture convex freeform mirror testing and is helpful for the manufacturing of freeform secondary mirror. The off-axis three-mirror system based on freeform secondary mirror shows its advantages in smaller cubage

better realizability in engineering

better wavefront error and higher MTF.

关键词

Keywords

references

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