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Proceedings Paper

Development of ultra-light-weight mirror with carbon/carbon composites for optical-IR astronomy
Author(s): Hajime Takeya; Masami Kume; Steven Hahn; Tsuyoshi Ozaki; Naoki Kohara; Masashi Otsubo; Saku Tsuneta
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Paper Abstract

Future large aperture telescope projects will require very lightweight mirrors that can be produced at significantly lower cost and faster production times than currently possible. Tailorable, low thermal expansion composite materials offer an attractive path to achieve these goals. Application of carbon/carbon composites is particularly attractive as these materials do not exhibit the moisture-absorption-related expansion problems observed in typical resin matrix composites. The National Astronomical Observatory of Japan and Mitsubishi Electric Corporation are collaborating to develop materials and surface finishing technologies to enable future carbon/carbon composite mirror applications. Material processing techniques for improved substrate surface finish have been developed. An innovative surface finish approach involving high precision machining of a metal layer applied to the mirror surface has also been developed. As a result, 150mm diameter C/C spherical mirror with honeycomb sandwich structure was successfully demonstrated.

Paper Details

Date Published: 12 October 2004
PDF: 8 pages
Proc. SPIE 5487, Optical, Infrared, and Millimeter Space Telescopes, (12 October 2004); doi: 10.1117/12.552304
Show Author Affiliations
Hajime Takeya, Mitsubishi Electric Corp. (Japan)
Masami Kume, Mitsubishi Electric Corp. (Japan)
Steven Hahn, Mitsubishi Electric Corp. (Japan)
Tsuyoshi Ozaki, Mitsubishi Electric Corp. (Japan)
Naoki Kohara, Univ. of Tokyo (Japan)
Masashi Otsubo, National Astronomical Observatory of Japan (Japan)
Saku Tsuneta, National Astronomical Observatory of Japan (Japan)

Published in SPIE Proceedings Vol. 5487:
Optical, Infrared, and Millimeter Space Telescopes
John C. Mather, Editor(s)

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