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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 20 — Jul. 10, 2010
  • pp: 3941–3948

Cryogenic optical testing of an 800 mm lightweight C/SiC composite mirror mounted on a C/SiC optical bench

Hidehiro Kaneda, Masataka Naitoh, Tadashi Imai, Yoshio Tange, Keigo Enya, Haruyoshi Katayama, Kenta Maruyama, Takao Nakagawa, Takashi Onaka, Masahiro Suganuma, Ryoko Kano, Yuichi Kiriyama, Tatsuya Mori, and Ai Takahashi  »View Author Affiliations


Applied Optics, Vol. 49, Issue 20, pp. 3941-3948 (2010)
http://dx.doi.org/10.1364/AO.49.003941


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Abstract

We tested the optical performance at cryogenic temperatures of an 800 mm diameter lightweight mirror, consisting of carbon-fiber reinforced silicon carbide and with a mass of 11.2 kg . The ceramic composite of the mirror was HB-Cesic, developed by ECM, Germany, and Mitsubishi Electric Corporation, Japan. The test was carried out while the mirror was mounted, via Invar stress relief supports, on a lightweight optical bench also made of HB-Cesic. During the test, both the mirror and the optical bench were cooled to 18 K in a liquid-helium chamber. The test consisted of measuring the mirror's change of surface figure with an interferometer installed outside the cryo-chamber. The cryogenic deformation of the mirror was 110 nm RMS with no significant residual deformation after cooling, which is very promising for the applicability of the HB-Cesic composite to large lightweight cryogenic space optics.

© 2010 Optical Society of America

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

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: April 12, 2010
Manuscript Accepted: June 11, 2010
Published: July 8, 2010

Citation
Hidehiro Kaneda, Masataka Naitoh, Tadashi Imai, Yoshio Tange, Keigo Enya, Haruyoshi Katayama, Kenta Maruyama, Takao Nakagawa, Takashi Onaka, Masahiro Suganuma, Ryoko Kano, Yuichi Kiriyama, Tatsuya Mori, and Ai Takahashi, "Cryogenic optical testing of an 800mm lightweight C/SiC composite mirror mounted on a C/SiC optical bench," Appl. Opt. 49, 3941-3948 (2010)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-49-20-3941

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