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Proceedings Paper

Design and performance of a F/#-conversion microlens for prime focus spectrograph at Subaru Telescope
Author(s): Naruhisa Takato; Yoko Tanaka; James E. Gunn; Naoyuki Tamura; Atsushi Shimono; Hajime Sugai; Hiroshi Karoji; Akitoshi Ueda; Kouichi Waseda; Masahiko Kimura; Youichi Ohyama
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Paper Abstract

The PFS is a multi-object spectrograph fed by 2394 fibers at the prime focus of Subaru telescope. Since the F/# at the prime focus is too fast for the spectrograph, we designed a small concave-plano negative lens to be attached to the tip of each fiber that converts the telescope beam (F/2.2) to F/2.8. We optimized the lens to maximize the number of rays that can be confined inside F/2.8 while maintaining a 1.28 magnification. The microlenses are manufactured by glass molding, and an ultra-broadband AR coating (<1.5% for λ = 0.38 - 1.26μm) will be applied to the front surface.

Paper Details

Date Published: 31 July 2014
PDF: 7 pages
Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 914765 (31 July 2014); doi: 10.1117/12.2055051
Show Author Affiliations
Naruhisa Takato, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Yoko Tanaka, Subaru Telescope, National Astronomical Observatory of Japan (United States)
James E. Gunn, Princeton Univ. (United States)
Naoyuki Tamura, Kavli Institute for the Physics and Mathematics of the Universe, The Univ. of Tokyo (Japan)
Atsushi Shimono, Kavli Institute for the Physics and Mathematics of the Universe, The Univ. of Tokyo (Japan)
Hajime Sugai, Kavli Institute for the Physics and Mathematics of the Universe, The Univ. of Tokyo (Japan)
Hiroshi Karoji, Kavli Institute for the Physics and Mathematics of the Universe, The Univ. of Tokyo (Japan)
Akitoshi Ueda, National Astronomical Observatory of Japan (Japan)
Kouichi Waseda, National Astronomical Observatory of Japan (Japan)
Masahiko Kimura, Institute of Astronomy and Astrophysics, Academia Sinica (Taiwan)
Youichi Ohyama, Institute of Astronomy and Astrophysics, Academia Sinica (Taiwan)


Published in SPIE Proceedings Vol. 9147:
Ground-based and Airborne Instrumentation for Astronomy V
Suzanne K. Ramsay; Ian S. McLean; Hideki Takami, Editor(s)

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