Mr. Duane E. Krumweide Profile

Duane E. Krumweide

at San Diego Composites LLC

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Proceedings Article | 17 September 2007 Paper

Carbon-carbon mirrors for exoatmospheric and space applications

Duane Krumweide, Gary Wonacott, Patrick Woida, Rigel Woida, Wei Shih

Proceedings Volume 6666, 66660H (2007) https://doi.org/10.1117/12.735854

KEYWORDS: Mirrors, Optical coatings, Beryllium, Composites, Surface finishing, Polishing, Telescopes, Carbon, Argon, Silicon

Read Abstract +

The cost and leadtime associated with beryllium has forced the MDA and other defense agencies to look for alternative materials with similar structural and thermal properties. The use of carbon-carbon material, specifically in optical components has been demonstrated analytically in prior SBIR work at San Diego Composites. Carbon-carbon material was chosen for its low in-plane and through-thickness CTE (athermal design), high specific stiffness, near-zero coefficient of moisture expansion, availability of material (specifically c-c honeycomb for lightweight substrates), and compatibility with silicon monoxide (SiO) and silicon dioxide (SiO₂) coatings. Subsequent development work has produced shaped carbon-carbon sandwich substrates which have been ground, polished, coated and figured using traditional optical processing. Further development has also been done on machined monolithic carbon-carbon mirror substrates which have also been processed using standard optical finishing techniques.

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