Design of off-axis three mirrors optical system with Lyot stop in low  f-number and wide line field of view

Chengliang Wang; Fuchun Chen; Hui Liu; Lijun Yi; Li Lu; Xiaobin Huang

doi:10.1117/12.2624370

27 March 2022 Design of off-axis three mirrors optical system with Lyot stop in low f-number and wide line field of view

Chengliang Wang, Fuchun Chen, Hui Liu, Lijun Yi, Li Lu, Xiaobin Huang

Author Affiliations +

Proceedings Volume 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications; 121695G (2022) https://doi.org/10.1117/12.2624370
Event: Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 2021, Kunming, China

Abstract

The aperture diaphragm of the Cook-TMA optical system is set on the secondary mirror, which improves the symmetry of the system. It has features of large field of view and small f-number, and suitable for infrared optical system. However, the system has no Lyot stop and low efficiency of cold diaphragm. A new method is proposed in this paper. First, Cook-TMA off-axis three-mirror reflection system is designed according to the requirements of field of view and f-number. Second, the aperture diaphragm is moved to a place behind the tertiary mirror and before the image surface, which becomes Lyot stop in fact. At this time, the beam obstruction problem arises. Starting with large f-number, we adjust and optimize gradually to solve the obstruction problem until the f-number meets the requirements. According to this method, three-mirror reflection optical system with off-axis field of view and off-axis aperture is designed with the f-number 1.6 , the field of view 11° by 1°, grid distortion less than 2%, imaging quality closed to the diffraction limit, which is suitable for imaging in infrared wavelength band.

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Chengliang Wang, Fuchun Chen, Hui Liu, Lijun Yi, Li Lu, and Xiaobin Huang "Design of off-axis three mirrors optical system with Lyot stop in low f-number and wide line field of view", Proc. SPIE 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 121695G (27 March 2022); https://doi.org/10.1117/12.2624370

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