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Proceedings Paper

Application of zero-expansion pore-free ceramics to a mirror of an astronomical telescope
Author(s): Hiroshi Akitaya; Masanori Iye; Kiichi Okita; Motoyasu Sato; Hiroyuki Matsuo; Takeshi Itazu; Takeshi Uno; Masao Yamaguchi; Zen-ei Tanaka; Takuya Yamashita; Koji S. Kawabata; Makoto Uemura; Mikio Kurita
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Paper Abstract

We developed an aspheric convex 33-cm diameter secondary mirror of the Hiroshima University 1.5-m Ritchy-Chretien telescope using Zero-expansion Pore-free ceramics, which has physical properties (thermal expansion, stiffness, thermal conductance, etc.) comparable with or better than existing zero-expansion glasses. After high-precision grinding, polishing, and coating aluminum and silicon monoxide, we obtained the sufficient optical reflecting surface with a figure error within λ/10 and a roughness of about 3 nm rms. The mirror has been attached on the telescope and we confirmed its sufficient performance through a Hartmann test. To date it has shown a good performance in our application and we suggest that this ceramic material has a potential to be used for astronomical telescopes and related area.

Paper Details

Date Published: 23 July 2008
PDF: 12 pages
Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 70183H (23 July 2008); doi: 10.1117/12.788884
Show Author Affiliations
Hiroshi Akitaya, National Astronomical Observatory of Japan (Japan)
Masanori Iye, National Astronomical Observatory of Japan (Japan)
Kiichi Okita, Okayama Astrophysical Observatory, National Astronomical Observatory of Japan (Japan)
Motoyasu Sato, National Institute for Fusion Science (Japan)
Hiroyuki Matsuo, Nihon Ceratec Co., Ltd. (Japan)
Takeshi Itazu, Nagase Integrex Co., Ltd. (Japan)
Takeshi Uno, Nagase Integrex Co., Ltd. (Japan)
Masao Yamaguchi, Nagase Integrex Co., Ltd. (Japan)
Zen-ei Tanaka, Yamagata Research Institute of Technology (Japan)
Takuya Yamashita, Hiroshima Astrophysical Science Ctr., Hiroshima Univ. (Japan)
Koji S. Kawabata, Hiroshima Astrophysical Science Ctr., Hiroshima Univ. (Japan)
Makoto Uemura, Hiroshima Astrophysical Science Ctr., Hiroshima Univ. (Japan)
Mikio Kurita, Nagoya Univ. (Japan)


Published in SPIE Proceedings Vol. 7018:
Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation
Eli Atad-Ettedgui; Dietrich Lemke, Editor(s)

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