Cryogenic Optical Testing of Sandwich-Type Silicon Carbide Mirrors
Applied Optics, Vol. 42, Issue 4, pp. 708-714 (2003)
http://dx.doi.org/10.1364/AO.42.000708
Acrobat PDF (275 KB)
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
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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