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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 11 — Apr. 10, 2007
  • pp: 2049–2056

Microscopic surface structure of C∕SiC composite mirrors for space cryogenic telescopes

Keigo Enya, Takao Nakagawa, Hidehiro Kaneda, Takashi Onaka, Tuyoshi Ozaki, and Masami Kume  »View Author Affiliations


Applied Optics, Vol. 46, Issue 11, pp. 2049-2056 (2007)
http://dx.doi.org/10.1364/AO.46.002049


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Abstract

We report on the microscopic surface structure of carbon-fiber-reinforced silicon carbide (C∕SiC) composite mirrors that have been improved for the Space Infrared Telescope for Cosmology and Astrophysics (SPICA) and other cooled telescopes. The C∕SiC composite consists of carbon fiber, silicon carbide, and residual silicon. Specific microscopic structures are found on the surface of the bare C∕SiC mirrors after polishing. These structures are considered to be caused by the different hardness of those materials. The roughness obtained for the bare mirrors is 20   nm rms for flat surfaces and 100   nm rms for curved surfaces. It was confirmed that a SiSiC slurry coating is effective in reducing the roughness to 2   nm rms. The scattering properties of the mirrors were measured at room temperature and also at 95 K. No significant change was found in the scattering properties through cooling, which suggests that the microscopic surface structure is stable with changes in temperature down to cryogenic values. The C∕SiC mirror with the SiSiC slurry coating is a promising candidate for the SPICA telescope.

© 2007 Optical Society of America

OCIS Codes
(110.6770) Imaging systems : Telescopes
(230.4040) Optical devices : Mirrors
(240.5450) Optics at surfaces : Polishing
(240.5770) Optics at surfaces : Roughness
(290.5880) Scattering : Scattering, rough surfaces

ToC Category:
Optics at Surfaces

History
Original Manuscript: July 3, 2006
Revised Manuscript: November 16, 2006
Manuscript Accepted: November 22, 2006
Published: March 20, 2007

Citation
Keigo Enya, Takao Nakagawa, Hidehiro Kaneda, Takashi Onaka, Tuyoshi Ozaki, and Masami Kume, "Microscopic surface structure of C/SiC composite mirrors for space cryogenic telescopes," Appl. Opt. 46, 2049-2056 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-11-2049

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