Cryogenic optical testing of sandwich-type silicon carbide mirrors

被引：21

作者：

Kaneda, H ^{[1
]}

Onaka, T

Kawada, M

Murakami, H

机构：

[1] Inst Space & Astronaut Sci, Kanagawa 22988510, Japan

[2] Univ Tokyo, Dept Astron, Tokyo 1130033, Japan

[3] Nagoya Univ, Grad Sch Sci, Aichi 4648602, Japan

来源：

APPLIED OPTICS | 2003年 / 42卷 / 04期

关键词：

D O I：

10.1364/AO.42.000708

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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. (C) 2003 Optical Society of America.

引用

页码：708 / 714

页数：7

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