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Proceedings Paper

Optical surfacing of reflecting SiC mirrors of 520mm R-C system
Author(s): Lvjun Yuan; Bin Wang
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Paper Abstract

In the area of astronomy and space camera, the application of silicon carbide (SiC) will have a good future for its specific stiffness and quickly thermal diffusion. However, SiC as a new material of optical mirror is difficult to process efficiently because of its specific characteristics such as stiffness and material structure. To manufacture the aspheric SiC mirrors of a R-C system with aperture 520mm in diameter, we starts to research on optical surfacing of SiC. Some small SiC parts are used to do serial surfacing experiments for finding a technology to improve the surface roughness of SiC. Test result shows that the surface roughness (RMS) of the best plate is better than 1.0nm. Finally, the surfacing results of the ellipsoid primary mirror with aperture 520mm in diameter and the hyperboloid secondary mirror with aperture 114mm in diameter of the R-C system are measured. The surface error (RMS) of them is less than 15nm, and the surface roughness of them is better than 1.8nm. The results meet the requirements of optical mirrors.

Paper Details

Date Published: 7 July 2006
PDF: 5 pages
Proc. SPIE 6149, 2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, 61493N (7 July 2006); doi: 10.1117/12.674359
Show Author Affiliations
Lvjun Yuan, Nanjing Institute of Astronomical Optics and Technology (China)
Bin Wang, Nanjing Institute of Astronomical Optics and Technology (China)


Published in SPIE Proceedings Vol. 6149:
2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies
Li Yang; Shangming Wen; Yaolong Chen; Ernst-Bernhard Kley, Editor(s)

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