Application of zero-expansion pore-free ceramics to a mirror of an astronomical telescope

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

doi:10.1117/12.788884

23 July 2008 Application of zero-expansion pore-free ceramics to a mirror of an astronomical telescope

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

Author Affiliations +

Proceedings Volume 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation; 70183H (2008) https://doi.org/10.1117/12.788884
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

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.

Citation Download Citation

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, and Mikio Kurita "Application of zero-expansion pore-free ceramics to a mirror of an astronomical telescope", Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 70183H (23 July 2008); https://doi.org/10.1117/12.788884

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