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Proceedings Paper

Evaluation of segmented and brazed mirror assemblies
Author(s): David A. Bath; David Spain; Eric Ness; Steve Williams; Michel Bougoin
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Paper Abstract

Direct Sintered Silicon Carbide (SSiC) is a promising material for mirror optics due to its low density, high stiffness and high thermal stability. In order to make large mirror optics (over 1 meter diameter), processing limitations to create monolithic structures of this size class require that smaller segments need to be fabricated and then joined in a post sintering operation. Fabrication of segmented &nullset;300mm lightweighted concave mirrors to demonstrate different fabrication methods is presented here. The mirrors are comprised of 6 radial segments joined by means of silicon braze technology and are coated with a SSiC Chemical Vapor Deposition (CVD) layer for improved surface finish to reduce straylight scatter. Evaluation of conventional pitch lap polishing of brazed and coated optic surfaces has shown no degradation to surface figure and surface roughness.

Paper Details

Date Published: 18 August 2005
PDF: 8 pages
Proc. SPIE 5868, Optical Materials and Structures Technologies II, 586805 (18 August 2005); doi: 10.1117/12.617266
Show Author Affiliations
David A. Bath, CoorsTek, Inc. (United States)
David Spain, CoorsTek, Inc. (United States)
Eric Ness, CoorsTek, Inc. (United States)
Steve Williams, CoorsTek, Inc. (United States)
Michel Bougoin, Boostec, Inc. (France)

Published in SPIE Proceedings Vol. 5868:
Optical Materials and Structures Technologies II
William A. Goodman, Editor(s)

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