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Proceedings Paper

SiC coatings on RB SiC mirrors for ultrasmooth surfaces
Author(s): Steven G. Johnson
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Paper Abstract

This is a review of the demonstrated capability to produce ultra-smooth super-polished surfaces (< 2 angstroms rms) when a reaction bonded silicon carbide (RB SiC) mirror is coated with a SiC coating. Also covered is the viability of this design choice for large scale lightweighted mirror blanks. A super-polished surface finish on bare RB SiC is not attainable due to the difference in hardness of the two phases, SiC and up to 30% silicon. Therefore, deposition of an additional layer of SiC onto the figured RB SiC blank is required. This technique has been demonstrated and can result in meter class optics with a surface roughness in the regime of less than 2 angstroms rms. The blank and optical fabrication techniques are described along with performance characterization data.

Paper Details

Date Published: 6 December 1993
PDF: 11 pages
Proc. SPIE 2018, Passive Materials for Optical Elements II, (6 December 1993); doi: 10.1117/12.165233
Show Author Affiliations
Steven G. Johnson, Hughes Danbury Optical Systems, Inc. (United States)

Published in SPIE Proceedings Vol. 2018:
Passive Materials for Optical Elements II
Gary W. Wilkerson, Editor(s)

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