Cryogenic performance of a lightweight silicon carbide mirror

Details Cryogenic performance of a lightweight silicon carbide mirror Cryogenic performance of a lightweight silicon carbide mirror

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005spie.5868..220e&link_type=abstract

Optical Materials and Structures Technologies II. Edited by Goodman, William A. Proceedings of the SPIE, Volume 5868, pp. 220

Computer Science

Performance

Scientific paper

Low cost, high performance lightweight Silicon Carbide (SiC) mirrors provide an alternative to Beryllium mirrors. A Trex Enterprises 0.25m diameter low areal density SiC mirror using its patented Chemical Vapor Composites (CVC) technology was evaluated for its optical performance at cryogenic temperature. CVC SiC is chemically pure, thermally stable, and mechanically stiff. CVC technology yields higher growth rate than that of CVD SiC. NASA has funded lightweight optical materials technology development efforts for future space based telescope programs. As part of these efforts, a Trex SiC mirror was measured interferometrically from room temperature to 30 degrees Kelvin. This paper will discuss the test goals, the cryogenic optical testing infrastructure and instrumentation at MSFC, test results, and lessons learned.

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