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Proceedings Paper

Properties of FOCAS optical components
Author(s): Koji S. Kawabata; Noboru Ebizuka; Toshiyuki Sasaki; Kazuhiro Sekiguchi; Masanori Iye; Kentaro Aoki; Ryo Asai; Motoko Inata; Nobunari Kashikawa; George Kosugi; Youichi Ohyama; Kiichi Okita; Tomohiko Ozawa; Yoshihiko Saito; Yasuhiro Shimizu; Hiroko Taguchi; Tadafumi Takata; Yasushi Yadoumaru; Michitoshi Yoshida
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Paper Abstract

The Faint Object Camera and Spectrograph, FOCAS, is a Cassegrain optical instrument of Subaru telescope. For its versatility, FOCAS has many optical components such as grisms, filters, and polarizers. They are inserted in the collimated beam section of 451 mm length. For the large pupil (90 mm in diameter) and the wide field of view (6 arcmin in diameter) of FOCAS, rigorous efforts were made in developing, manufacturing and assembling these components. The resultant performance of the instrument is quite stable and is almost as high as that expected from the design values. In the text, overall characteristics of each optical element is described.

Paper Details

Date Published: 7 March 2003
PDF: 10 pages
Proc. SPIE 4841, Instrument Design and Performance for Optical/Infrared Ground-based Telescopes, (7 March 2003); doi: 10.1117/12.461923
Show Author Affiliations
Koji S. Kawabata, National Astronomical Observatory of Japan (Japan)
Noboru Ebizuka, The Institute of Physical and Chemical Research-RIKEN (Japan)
Toshiyuki Sasaki, Subaru Telescope/NAOJ (United States)
Kazuhiro Sekiguchi, Subaru Telescope/NAOJ (United States)
Masanori Iye, National Astronomical Observatory of Japan (Japan)
Graduate Univ. for Advanced Studies (Japan)
Kentaro Aoki, Subaru Telescope/NAOJ (United States)
Ryo Asai, Univ. of Tokyo (Japan)
Motoko Inata, Okayama Astrophysical Observatory/NAOJ (Japan)
Nobunari Kashikawa, National Astronomical Observatory of Japan (Japan)
George Kosugi, Subaru Telescope/NAOJ (United States)
Youichi Ohyama, Subaru Telescope/NAOJ (Japan)
Kiichi Okita, Okayama Astrophysical Observatory/NAOJ (Japan)
Tomohiko Ozawa, Misato Observatory (Japan)
Yoshihiko Saito, National Astronomical Observatory of Japan (Japan)
Yasuhiro Shimizu, Okayama Astrophysical Observatory/NAOJ (Japan)
Hiroko Taguchi, Tokyo Gakugei Univ. (Japan)
Tadafumi Takata, Subaru Telescope/NAOJ (United States)
Yasushi Yadoumaru, Misato Observatory (Japan)
Michitoshi Yoshida, Okayama Astrophysical Observatory/NAOJ (Japan)

Published in SPIE Proceedings Vol. 4841:
Instrument Design and Performance for Optical/Infrared Ground-based Telescopes
Masanori Iye; Alan F. M. Moorwood, Editor(s)

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