Design of improved off-axial TMA optical systems

ZHAO Wen-cai

doi:10.3788/OPE.20111912.2837

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Design of improved off-axial TMA optical systems

Article | 更新时间：2020-08-12

- Design of improved off-axial TMA optical systems
- Optics and Precision Engineering Vol. 19, Issue 12, Pages: 2837-2843(2011)
- 作者机构：
  
  中国科学院长春光学精密机械与物理研究所,吉林长春,中国,130033
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20111912.2837
  CLC： TP73;TH703
- Received：19 April 2011，
  
  Revised：10 May 2011，
  
  Published Online：25 December 2011，
  
  Published：25 December 2011
- 稿件说明：
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赵文才. 改进的离轴三反光学系统的设计[J]. 光学精密工程, 2011,19(12): 2837-2843

ZHAO Wen-cai. Design of improved off-axial TMA optical systems[J]. Editorial Office of Optics and Precision Engineering, 2011,19(12): 2837-2843
赵文才. 改进的离轴三反光学系统的设计[J]. 光学精密工程, 2011,19(12): 2837-2843 DOI： 10.3788/OPE.20111912.2837.

ZHAO Wen-cai. Design of improved off-axial TMA optical systems[J]. Editorial Office of Optics and Precision Engineering, 2011,19(12): 2837-2843 DOI： 10.3788/OPE.20111912.2837.

摘要

基于离轴三反光学系统(TMA)的一般设计方法

总结了设计要点。以两个基于三反光学系统的设计为实例

阐述了通过合理地安排光学结构、将次镜设计为球面反射镜、主镜和三镜在球面基础上改变高次非球面系数等

可使离轴三反光学系统的设计结果接近衍射极限

传递函数在50 lp/mm时都接近0.6

Strehl率由通常的0.91提高到0.93。与传统离轴三反系统相比

相机加工公差和面形加工公差从原来的/50放宽到/40

主、次、三镜的装调公差放宽了4倍。文中的设计降低了相机的加工及装调难度

有助于系统光学特性实现衍射极限

为三反光学系统的广泛应用提供了借鉴和实用参考。

Abstract

The key design of off-axial Three-mirror Anastigmat(TMA) systems was summarized

and an improved design of the off-axial TMA optical systems was proposed with a new optical structure. By taking two designed systems for examples

the optical elements of the TMA system were reasonably arranged

the secondary mirror was designed as a spherical surface

and the primary and the third mirrors were optimized with high-order aspheric coefficients. Obtained results show that the Modulation Transform Function(MTF) curve of the designed system approaches to the optical diffraction limit with an improved value of 0.6 at the spatial frequency of 50 pl/mm. Compared with the common off-axial TMA optical system

the Strehl ratio can be increased from 0.91 to 0.93. The surface tolerance is relaxed from /50 to /40

and the assembling tolerances of the primary mirror

second mirror and the third mirror can be relaxed by a factor of 4. The improved design makes the manufacture and assembly of the off-axial TMA optical system much easier

and helps the system to achieve excellent performance in the level of optical diffraction limit. These are beneficial to the popularization of off-axial TMA optical systems.

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references

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