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Proceedings Paper

Development of the SiC ultralight mirror for large space telescope and for extremely huge ground-based telescope
Author(s): Noboru Ebizuka; Yutang Dai; Hiroaki Eto; Weimin Lin; Toshikazu Ebisuzaki; Hitoshi Omori; Thoshikazu Handa; Hideki Takami; Yoshiyuki Takahashi
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Paper Abstract

Ultra lightweight mirrors of silicon carbide (SiC) are used for a large number of space telescopes, and SiC is also candidate as hopeful material for segmented mirrors of the next generation ground based telescopes from 20 to 100 m in diameter. However, an SiC mirror is difficult to shape because the material is very hard and brittle. We are developing an SiC mirror by means of an ultra-precision rotary grinding machine (800 mm in diameter) and the ELID (ELectrolytic In-process Dressing) grinding method. The method is suitable for fabrications of very hard materials, such as crystalline silicon and sapphire, ceramics, glasses, hard metals and so on. In this study, we present results of test fabrication for the SiC mirrors by means of ELID grinding method and evaluations of the profile deformation of the lightweight mirrors by using FEM simulation method.

Paper Details

Date Published: 30 January 2003
PDF: 6 pages
Proc. SPIE 4842, Specialized Optical Developments in Astronomy, (30 January 2003); doi: 10.1117/12.457408
Show Author Affiliations
Noboru Ebizuka, RIKEN-The Institute of Physical and Chemical Research (Japan)
Yutang Dai, RIKEN-The Institute of Physical and Chemical Research (Japan)
Hiroaki Eto, RIKEN-The Institute of Physical and Chemical Research (Japan)
Weimin Lin, RIKEN-The Institute of Physical and Chemical Research (Japan)
Toshikazu Ebisuzaki, RIKEN-The Institute of Physical and Chemical Research (Japan)
Hitoshi Omori, RIKEN-The Institute of Physical and Chemical Research (Japan)
Thoshikazu Handa, Institute of Astronomy/Univ. of Tokyo (Japan)
Hideki Takami, National Astronomical Observatory of Japan (United States)
Yoshiyuki Takahashi, Univ. of Alabama in Huntsville (United States)


Published in SPIE Proceedings Vol. 4842:
Specialized Optical Developments in Astronomy
Eli Atad-Ettedgui; Sandro D'Odorico, Editor(s)

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