Computer Science – Performance
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008spie.7018e.111a&link_type=abstract
Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation. Edited by Atad-Ettedgui, Eli; Lemke, Dietrich.
Computer Science
Performance
Scientific paper
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.
Akitaya Hiroshi
Itazu Takeshi
Iye Masanori
Kawabata Koji S.
Kurita Mikio
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