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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 42, Iss. 4 — Feb. 1, 2003
  • pp: 708–714

Cryogenic optical testing of sandwich-type silicon carbide mirrors

Hidehiro Kaneda, Takashi Onaka, Mitsunobu Kawada, and Hiroshi Murakami  »View Author Affiliations


Applied Optics, Vol. 42, Issue 4, pp. 708-714 (2003)
http://dx.doi.org/10.1364/AO.42.000708


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Abstract

The experimental cryogenic performance of 160-mm-diameter silicon carbide (SiC) mirrors, one of which, a 700-mm-diameter mirror, is to be used as a primary mirror of the Japanese Infrared Astronomical Satellite ASTRO-F, is described. The mirrors are made from a sandwich-type SiC material that comprises a light porous core and a dense chemical-vapor-deposited coat of SiC. Three mirrors were manufactured consecutively, and changes in their surface contours related to temperature were measured with an interferometer when the mirrors were placed in a liquid-helium cryostat. Owing to significant improvements in manufacturing, the third SiC mirror showed only slight deformation as the temperature decreased from 300 to 6 K, which indicates high thermal strain homogeneity for a well-controlled sandwich-type SiC mirror.

© 2003 Optical Society of America

OCIS Codes
(110.6770) Imaging systems : Telescopes
(120.6650) Instrumentation, measurement, and metrology : Surface measurements, figure
(120.6660) Instrumentation, measurement, and metrology : Surface measurements, roughness
(220.4840) Optical design and fabrication : Testing
(230.4040) Optical devices : Mirrors
(350.1260) Other areas of optics : Astronomical optics

History
Original Manuscript: April 15, 2002
Revised Manuscript: October 8, 2002
Published: February 1, 2003

Citation
Hidehiro Kaneda, Takashi Onaka, Mitsunobu Kawada, and Hiroshi Murakami, "Cryogenic optical testing of sandwich-type silicon carbide mirrors," Appl. Opt. 42, 708-714 (2003)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-42-4-708

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