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Proceedings Paper

Manufacturing and testing SiC aspherical mirrors in space telescopes
Author(s): Xuejun Zhang; Zhongyu Zhang; Ligong Zheng; Di Fan
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Paper Abstract

Reaction Bonded (RB) SiC mirrors due to their excellent specific stiffness and thermal properties have been widely used in space telescopes. However, polishing large SiC aspherical mirrors is difficult compared to other materials such as fused silica or Zerodu. In addition, surface roughness of the polished SiC mirrors is limited by the defects of the materials and needs to be improved by means of surface coating technique. This paper introduces the current progress of large SiC aspherical mirrors manufacturing and testing in CIOMP. In particular, the procedures of making large off-axis aspherical mirrors were discussed in detail. A proprietary computer controlled optical surfacing (CCOS) technique was utilized to grind and polish the mirrors and the computer aided null test was used to measure the surface figure. As results, a 600mm class off-axis SiC aspherical mirrors was demonstrated with figure error less than 13nm rms.

Paper Details

Date Published: 9 December 2005
PDF: 5 pages
Proc. SPIE 6024, ICO20: Optical Devices and Instruments, 602402 (9 December 2005); doi: 10.1117/12.666803
Show Author Affiliations
Xuejun Zhang, Changchun Institute of Optics and Fine Mechanics and Physics (China)
Zhongyu Zhang, Changchun Institute of Optics and Fine Mechanics and Physics (China)
Ligong Zheng, Changchun Institute of Optics and Fine Mechanics and Physics (China)
Di Fan, Changchun Institute of Optics and Fine Mechanics and Physics (China)


Published in SPIE Proceedings Vol. 6024:
ICO20: Optical Devices and Instruments
James C. Wyant; X. J. Zhang, Editor(s)

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