薄膜衍射消热差红外光学系统设计

王烨菲; 程艳萍; 姚园; 李道京; 于潇

薄膜衍射消热差红外光学系统设计

王烨菲^{1, 2,},
程艳萍¹,
姚园¹,
李道京³,
于潇¹

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
3.
中国科学院空天信息创新研究院微波成像技术国家重点实验室，北京 100190

基金项目:

中国科学院国防重点实验室基金项目 CXJJ-19S014

高分辨率对地观测系统重大专项 GFZX0403260314

详细信息

作者简介:
王烨菲（1996-），女，研究实习员，主要从事光学系统设计方面的研究。E-mail：Rebecca2946@163.com

中图分类号: TN216
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- 被引次数: 0
出版历程
- 收稿日期: 2021-02-01
- 修回日期: 2021-03-30
- 刊出日期: 2021-05-22

Design of Membrane Diffractive Athermal Infrared Optical System

1.
Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
Key Laboratory of Science and Technology on Microwave Imaging, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China

摘要

摘要: 设计了一种薄膜衍射消热差红外光学系统。此光学系统口径为200 mm，焦距为200 mm，相对孔径为1，全视场角为3°，工作波段为10.7~10.9 μm。该系统采用薄膜衍射镜作为主镜，厚度为微米量级，具有口径大、重量轻的优点，解决了现有红外光学系统重量和口径无法调和的矛盾。利用含有衍射面的折衍混合透镜进行校正主镜带来的强色散，有效解决薄膜衍射主镜成像视场小、谱段范围窄等问题。采用薄膜衍射主镜、折衍混合透镜，很好地利用了衍射面良好的消热差特性，再结合透镜材料的选择，对光学系统消热差起到了良好的作用，并且，衍射面的使用为系统设计优化过程中增加了自由度。薄膜衍射消热差红外光学系统重量轻、成像质量好、消热差性能优良，在红外遥感成像探测领域具有良好的应用前景。
- 光学设计 /
- 衍射光学 /
- 薄膜 /
- 消热差
Abstract: A membrane diffractive athermal infrared optical system is designed. The optical system has an aperture of 200 mm, a focal length of 200 mm, a relative aperture of 1, a full field angle of 3°, and a working wavelength of 10.7-10.9 μm. The system uses the membrane diffractive lens as the primary lens, with the thickness of a micron, and has the advantages of large aperture and light weight, which solves the contradiction between the weight and the aperture of the existing infrared optical system. A hybrid refractive diffractive lens with a diffractive surface is used to correct the strong dispersion of the primary lens, effectively solving the problems of small field of view and narrow spectral range of the membrane diffractive primary lens. The use of membrane diffractive primary lens and refractive diffractive hybrid lens effectively utilizes the good athermalization characteristics of the diffractive surface. Combined with the selection of lens materials, it plays a good role in the athermalization of the optical system; the use of the diffractive surface increases the degree of freedom in the process of system design optimization. Membrane diffractive athermal infrared optical system has the advantages of light weight, good imaging quality, and excellent athermalization performance, which has a good application prospect in the field of infrared remote sensing imaging detection.
- optical design /
- diffractive optics /
- membrane /
- athermalization

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图 1 薄膜衍射成像系统光学布局图

Figure 1. Optical layout of membrane diffractive imaging system

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图 2 薄膜衍射主镜光路图

Figure 2. Optical path diagram of membrane diffractive primary lens

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图 3 薄膜衍射主镜相位曲线

Figure 3. Phase curve of membrane diffractive primary lens

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图 4 薄膜衍射主镜MTF曲线

Figure 4. MTF of membrane diffractive primary lens

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图 5 薄膜衍射消热差红外光学系统光路图

Figure 5. Optical path diagram of membrane diffractive athermal infrared optical system

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图 6 红外光学系统不同环境温度下MTF曲线

Figure 6. MTF at different temperatures of the infrared optical system

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图 7 不同环境温度下场曲和畸变曲线

Figure 7. Field curvature and distortion at different temperatures

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图 8 薄膜衍射主镜衍射效率与入射角及波长关系

Figure 8. Relationship between membrane diffractive primary lens and incident angle and wavelength

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表 1 光学系统参数

Table 1. Optical system parameters

System parameter	Numerical value
Wavelength band	10.7-10.9 μm
Focal length	200 mm
F number	1
Working temperature	-50℃-+60℃

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表 2 光学系统公差

Table 2. Tolerance of optical system

Component serial number	Surface serial number	RMS	Thickness and air separation/mm	Tilt/"
1	1	0.025	±0.02	40
1	2	0.025	±0.02	40
2	1	0.025	±0.02	40
2	2	0.025	±0.02	40
3	1	0.025	±0.02	40
3	2	0.025	±0.02	40
4	1	0.025	±0.02	40
4	2	0.025	±0.02	40
5	1	0.025	±0.02	40
5	2	0.025	±0.02	40
6	1	0.025	±0.02	40
6	2	0.025	±0.02	40
7	1	0.025	±0.02	40
7	2	0.025	±0.02	40

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表 3 鬼像路径信息

Table 3. Ghost image path information

Ghost image path	Distance to ghost focus/mm	Effective focal length/mm	Marginal ray height/mm
7-5	-0.1544	7.2220	-2.1375

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表 4 不同级次下主镜衍射效率

Table 4. Diffraction efficiency of primary lens at different diffraction orders

Diffraction order	Diffraction efficiency
-2	0.0009%
-1	0.0022%
+1	99.9600%
+2	0.0089%
+3	0.0022%

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