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Design of SiC mirror subsystem of a space-based astronomy telescope
Author(s): Liang-jie Feng; Jiao-teng Ding; Gang-yi Zou
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Paper Abstract

A Φ450mm primary mirror subsystem of a space-based astronomy telescope was designed with mass, optical surface distortion and reflectivity requirement. The open-back primary mirror was made of pressure-less sintering silicon carbide, light-weighted at a ratio of approximately 70%. Three side supporting invar flexure bipods were designed to minimize the assembling stress and the thermal stress. The high reflection was obtained from the optical surface cementite. The mirror weighted 7kg and the reflectivity was 97% after optical polishing. The mirror subsystem was precisely assembled under the strict technical condition. The optical test with interferometer showed that the optical surface distortion is less than 1/40λ rms, which met the critical optical requirements for the primary mirror of the space-based astronomy telescope.

Paper Details

Date Published: 11 January 2019
PDF: 10 pages
Proc. SPIE 10837, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 108370A (11 January 2019); doi: 10.1117/12.2504931
Show Author Affiliations
Liang-jie Feng, Xi'an Institute of Optics and Precision Mechanics (China)
Jiao-teng Ding, Xi'an Institute of Optics and Precision Mechanics (China)
Gang-yi Zou, Xi'an Institute of Optics and Precision Mechanics (China)


Published in SPIE Proceedings Vol. 10837:
9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes
Xiaoliang Ma; Bin Fan; Yongjian Wan; Adrian Russell; Xiangang Luo, Editor(s)

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