Evaluation of segmented and brazed mirror assemblies

David A. Bath; David Spain; Eric Ness; Steve Williams; Michel Bougoin

doi:10.1117/12.617266

18 August 2005 Evaluation of segmented and brazed mirror assemblies

David A. Bath, David Spain, Eric Ness, Steve Williams, Michel Bougoin

Proceedings Volume 5868, Optical Materials and Structures Technologies II; 586805 (2005) https://doi.org/10.1117/12.617266
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

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.

Citation Download Citation

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

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