Optical design of off-axis astronomical space telescope based on freeform surfaces

Xin Zhang; Jian-ping Zhang; Guang-wei Shi; Yan-xiong Wu; Ling-jie Wang; Fei Zeng; He-meng Qu; Ji-zhen Zhang; Hong-bo Wu; Yang Zhu; Chao Wang

doi:10.1117/12.2073281

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17 December 2014 Optical design of off-axis astronomical space telescope based on freeform surfaces

Xin Zhang, Jian-ping Zhang, Guang-wei Shi, Yan-xiong Wu, Ling-jie Wang, Fei Zeng, He-meng Qu, Ji-zhen Zhang, Hong-bo Wu, Yang Zhu, Chao Wang

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Proceedings Volume 9293, International Optical Design Conference 2014; 92930P (2014) https://doi.org/10.1117/12.2073281
Event: International Optical Design Conference, 2014, Kohala Coast, Hawaii, United States

Abstract

A large-aperture, wide field-of-view, three-mirror optical system for a space borne astronomical survey telescope has been designed. The unobstructed optical system with a circular pupil has a 2 meter aperture, 1.7 deg² FOV, and provides remarkably good imagery. Freeform surfaces and decentered/tilt surfaces are introduced to the system, which have the advantage of balancing the unsymmetrical aberrations, especially for the wide-field off-axis optical systems. The evaluation of image quality is that the value of the RMS wavefront error is 21 nm, the ellipticity is less than 6.5% in the main imaging area (about 1.1 deg²), and the maximum radius of Encircled Energy 80% (EE80) is less than 0.09arcsec.

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Xin Zhang, Jian-ping Zhang, Guang-wei Shi, Yan-xiong Wu, Ling-jie Wang, Fei Zeng, He-meng Qu, Ji-zhen Zhang, Hong-bo Wu, Yang Zhu, and Chao Wang "Optical design of off-axis astronomical space telescope based on freeform surfaces", Proc. SPIE 9293, International Optical Design Conference 2014, 92930P (17 December 2014); https://doi.org/10.1117/12.2073281

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