18 August 2005 Evaluation of segmented and brazed mirror assemblies
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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.
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David A. Bath, David A. Bath, David Spain, David Spain, Eric Ness, Eric Ness, Steve Williams, Steve Williams, Michel Bougoin, Michel Bougoin, } "Evaluation of segmented and brazed mirror assemblies", Proc. SPIE 5868, Optical Materials and Structures Technologies II, 586805 (18 August 2005); doi: 10.1117/12.617266; https://doi.org/10.1117/12.617266
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