Design and performance of a F/#-conversion microlens for prime focus spectrograph at Subaru Telescope

Naruhisa Takato; Yoko Tanaka; James E. Gunn; Naoyuki Tamura; Atsushi Shimono; Hajime Sugai; Hiroshi Karoji; Akitoshi Ueda; Kouichi Waseda; Masahiko Kimura; Youichi Ohyama

doi:10.1117/12.2055051

31 July 2014 Design and performance of a F/#-conversion microlens for prime focus spectrograph at Subaru Telescope

Naruhisa Takato, Yoko Tanaka, James E. Gunn, Naoyuki Tamura, Atsushi Shimono, Hajime Sugai, Hiroshi Karoji, Akitoshi Ueda, Kouichi Waseda, Masahiko Kimura, Youichi Ohyama

Author Affiliations +

Proceedings Volume 9147, Ground-based and Airborne Instrumentation for Astronomy V; 914765 (2014) https://doi.org/10.1117/12.2055051
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

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.

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Naruhisa Takato, Yoko Tanaka, James E. Gunn, Naoyuki Tamura, Atsushi Shimono, Hajime Sugai, Hiroshi Karoji, Akitoshi Ueda, Kouichi Waseda, Masahiko Kimura, and Youichi Ohyama "Design and performance of a F/#-conversion microlens for prime focus spectrograph at Subaru Telescope", Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 914765 (31 July 2014); https://doi.org/10.1117/12.2055051

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