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Proceedings Paper

Design of laser system for Subaru LGS AO
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Paper Abstract

We present the development status of the laser system for Subaru Laser Guide Star Adaptive Optics System. We are manufacturing the quasi-continuous-wave sum frequency laser as a prototype. The optical efficiency of sum frequency generation normalized by the mode-locked fundamental YAG (1064 nm) laser output power is achieved to be 14 % using the non-linear crystal, periodically poled potassium titanyl phosphate (PPKTP). Output power at sodium D2 line was about 260 mW. The optical relay fiber and the laser launching telescope are also described in this paper. For the optical relay fiber, we are testing an index guided photonic crystal fiber (PCF), whose core material is filled by fused silica, and whose clad has close-packed air holes in two dimension. The coupling efficiency was evaluated as about 80 % using 1mW He-Ne laser. We introduce the design of laser launching telescope (LLT), which is a copy of VLT laser launching telescope, and the interface to the Subaru Telescope.

Paper Details

Date Published: 25 October 2004
PDF: 8 pages
Proc. SPIE 5490, Advancements in Adaptive Optics, (25 October 2004); doi: 10.1117/12.551015
Show Author Affiliations
Yutaka Hayano, Subaru Telescope/National Astronomical Observatory of Japan (United States)
Yoshihiko Saito, National Astronomical Observatory of Japan (Japan)
Norihito Saito, Institute of Physical and Chemical Research (Japan)
Kazuyuki Akagawa, Megaopto Co., Ltd. (Japan)
Yukiko Kamata, National Astronomical Observatory of Japan (Japan)
Tomio Kanzawa, Subaru Telescope/National Astronomical Observatory of Japan (United States)
Tomio Kurakami, Subaru Telescope/National Astronomical Observatory of Japan (United States)
Naruhisa Takato, Subaru Telescope/National Astronomical Observatory of Japan (United States)
Stephen Colley, Subaru Telescope/National Astronomical Observatory of Japan (United States)
Michael Eldred, Subaru Telescope/National Astronomical Observatory of Japan (United States)
Thomas Kane, Subaru Telescope/National Astronomical Observatory of Japan (United States)
Olivier Guyon, Subaru Telescope/National Astronomical Observatory of Japan (United States)
Shin Oya, Subaru Telescope/National Astronomical Observatory of Japan (United States)
Makoto Watanabe, Subaru Telescope/National Astronomical Observatory of Japan (United States)
Masayuki Hattori, Subaru Telescope/National Astronomical Observatory of Japan (United States)
Taras Golota, Subaru Telescope/National Astronomical Observatory of Japan (United States)
Matthew Dinkins, Subaru Telescope/National Astronomical Observatory of Japan (United States)
Naoto Kobayashi, Univ. of Tokyo (Japan)
Yosuke Minowa, Univ. of Tokyo (Japan)
Miwa Goto, Max-Planck-Institut fur Astnoromie (Germany)
Nobuo Arimoto, National Astronomical Observatory of Japan (Japan)
Satoshi Wada, Institute of Physical and Chemical Research (Japan)
Hideki Takami, Subaru Telescope/National Astronomical Observatory of Japan (United States)
Masanori Iye, National Astronomical Observatory of Japan (Japan)


Published in SPIE Proceedings Vol. 5490:
Advancements in Adaptive Optics
Domenico Bonaccini Calia; Brent L. Ellerbroek; Roberto Ragazzoni, Editor(s)

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