Optical design of the off-axis reflective system with wide fov

YU Yaqiong; WANG Lingjie; ZHAO Shangnan; ZHANG Jianping; ZHANG Xin

doi:10.37188/OPE.20233114.2019

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Optical design of the off-axis reflective system with wide fov

Modern Applied Optics | 更新时间：2023-08-26

- Optical design of the off-axis reflective system with wide fov
- Optics and Precision Engineering Vol. 31, Issue 14, Pages: 2019-2030(2023)
- 作者机构：
  
  1.中国科学院长春光学精密机械与物理研究所，吉林长春130033
  2.中国科学院大学，北京100049
- 作者简介：
- 基金信息：
- DOI：10.37188/OPE.20233114.2019
  CLC： TP394.1;TH691.9
- Received：06 February 2023，
  
  Revised：02 March 2023，
  
  Published：25 July 2023
- 稿件说明：
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于亚琼,王灵杰,赵尚男等.二维大视场离轴反射式光学系统设计[J].光学精密工程,2023,31(14):2019-2030.

YU Yaqiong,WANG Lingjie,ZHAO Shangnan,et al.Optical design of the off-axis reflective system with wide fov[J].Optics and Precision Engineering,2023,31(14):2019-2030.
于亚琼,王灵杰,赵尚男等.二维大视场离轴反射式光学系统设计[J].光学精密工程,2023,31(14):2019-2030. DOI： 10.37188/OPE.20233114.2019.

YU Yaqiong,WANG Lingjie,ZHAO Shangnan,et al.Optical design of the off-axis reflective system with wide fov[J].Optics and Precision Engineering,2023,31(14):2019-2030. DOI： 10.37188/OPE.20233114.2019.

摘要

宽视场光学成像系统可以增大光学遥感器观测范围、提高探测效率。近年来，基于自由曲面的光学系统设计和制造取得了重大进展，为设计大视场、大相对孔径、高分辨率、高成像质量、无遮挡离轴反射系统提供了可能性。首先，分析了大视场离轴反射系统的像差特性，指出当不断增加系统视场角，尤其是子午方向视场角时，与视场相关的非对称高级像差量将剧烈增加；像场连续性要求更加凸显。接着，提出了一种二维大视场长焦距离轴光学系统设计方法：在常规光学系统初始结构基础上，采用多重结构形式，使子午方向视场角离散化，光学系统特定曲面分解为两个子曲面；并构建系统约束条件，通过约束系统外形尺寸、优化系统结构形式进而完成系统优化设计。最后，基于提出的方法，设计了一款焦距为1 000 mm，像方F数为10，视场角为40°×16°的自由曲面离轴四反光学系统。设计结果表明：该系统全视场范围内成像质量较好，50 lp/mm的特征频率下，400~750 nm可见光波段内光学调制传递函数优于0.26，证明该方法切实有效。

Abstract

Generally， the observation ranges and detection efficiencies of optical remote sensors can be enhanced using wide-field optical imaging systems. Accordingly， the design and manufacturing of freeform-surface-based optical systems have achieved significant progress recently， making the construction of wide-field， rapid， higher-quality-resolution and -imaging， and obstacle-free off-axis reflection systems feasible. The first part of this paper presents a detailed analysis of the aberration characteristics of an off-axis reflection system. This asymmetric higher level aberration increases dramatically as the field of view （FOV）， specifically the meridional FOV， of the system increases. These characteristics place a prominent requirement on image field continuity. The second part of this paper presents a new design approach for two-dimensional （2-D） large FOV optical systems with long focal lengths. First， we built multiple structural forms based on conventional optical systems， leading to a discretized meridional field angle， and with certain specific surfaces of the optical system decomposed into two sub-surfaces. Following this， system optimization was achieved by constraining the system size and improving its structural form. Finally， we designed the off-axis reflective freeform surface optical system. The imaging quality was good within the entire FOV， realizing 2-D large-field imaging of 40°×16°， a focal length of 1 m， and an F-number of 10. The test results prove that the proposed design is good， yielding an optical modulation transfer function of better than 0.26， particularly in the visible spectrum of 400-750 nm with a characteristic frequency of 50 lp/mm.

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references

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