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Proceedings Paper

Optical design of off-axis astronomical space telescope based on freeform surfaces
Author(s): 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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Paper 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.

Paper Details

Date Published: 17 December 2014
PDF: 8 pages
Proc. SPIE 9293, International Optical Design Conference 2014, 92930P (17 December 2014); doi: 10.1117/12.2073281
Show Author Affiliations
Xin Zhang, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Jian-ping Zhang, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Guang-wei Shi, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Yan-xiong Wu, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Ling-jie Wang, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Fei Zeng, Changchun Institute of Optics, Fine Mechanics and Physics (China)
He-meng Qu, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Ji-zhen Zhang, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Hong-bo Wu, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Yang Zhu, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Chao Wang, Changchun Institute of Optics, Fine Mechanics and Physics (China)


Published in SPIE Proceedings Vol. 9293:
International Optical Design Conference 2014
Mariana Figueiro; Scott Lerner; Julius Muschaweck; John Rogers, Editor(s)

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