Design of an off-axis two-mirror free-form infrared optical system with wide field of view and fast focal ratio

Chengliang Wang; Hui Liu; Lijun YI; Xiaobin Huang; Li Lu; Yangyan Ou

doi:10.1117/12.2624818

27 March 2022 Design of an off-axis two-mirror free-form infrared optical system with wide field of view and fast focal ratio

Chengliang Wang, Hui Liu, Lijun YI, Xiaobin Huang, Li Lu, Yangyan Ou

Author Affiliations +

Proceedings Volume 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications; 121696P (2022) https://doi.org/10.1117/12.2624818
Event: Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 2021, Kunming, China

Abstract

When the off-axis two reflection optical system is applied to the infrared system, it faces the contradiction between Wide FOV and small F#. The off-axis three reflection system can increase field of view in the symmetrical direction but difficult in the asymmetric direction. This paper explores a method to solve this problem. First, a three-mirror reflection system is designed with off-axis field of view and aperture according to requirements of field of view and F# in the symmetrical direction. The field of view in the asymmetric direction is set at about 1°, and the aperture diaphragm is placed in front of the image plane to form Lyot Stop. Then the main mirror is planarized and removed that the secondary mirror and the tertiary mirror can form an Anti-telephoto structure, the field of view is increased in the asymmetric direction. Finally, the dimensional constraints are established to avoid occlusion and adjust and optimize this system. According to this method, a double off-axis two reflection optical system suitable for infrared imaging is designed with the f-number 1.6, the field of view 7°×7°, the distortion less than 3% and the imaging quality close to the diffraction limit.

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Chengliang Wang, Hui Liu, Lijun YI, Xiaobin Huang, Li Lu, and Yangyan Ou "Design of an off-axis two-mirror free-form infrared optical system with wide field of view and fast focal ratio", Proc. SPIE 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 121696P (27 March 2022); https://doi.org/10.1117/12.2624818

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KEYWORDS

Mirrors

Off axis mirrors

Infrared imaging

Infrared radiation

Imaging systems

Reflection

Diffraction

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