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Proceedings Paper

Laser guide star AO project at the Subaru Telescope
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Paper Abstract

The laser guide star adaptive optics (AO) system for Subaru Telescope is presented. The system will be installed at the IR Nasmyth platform, whereas the current AO system with 36 elements is operating at the Cassegrain focus. The new AO system has a 188 element wavefront curvature sensor with photon counting APD modules which is the largest control element curvature sensor system ever. The system will have 4-10 W solid state sum-frequency laser to generate a laser guide star. The laser launching telescope with 50 cm aperture will be installed at behind the secondary mirror. The laser unit will be installed on the third floor of the dome and the laser beam will be transferred to the laser launching telescope using single mode photonic crystal fiber cable. The field of view of the optics is 2.7 arcmin to maximize the probability to find tilt guide stars for laser guide star operation. The expected Strehl ratio as raw AO performance is 0.46 at H-band under 0.60" seeing with 12 th mag guide star, and 0.71 for 8 th mag stars. New wavefront modulation technique, dual stroke membrane mirror control, is developed to reduce the tilt error which is more dominant for curvature sensor AO system. The superb contrast imaging capability will be expected as natural guide star system. The first light as the natural guide star system is planned in March 2006, the laser first light will be expected in March 2007.

Paper Details

Date Published: 25 October 2004
PDF: 9 pages
Proc. SPIE 5490, Advancements in Adaptive Optics, (25 October 2004); doi: 10.1117/12.550839
Show Author Affiliations
Hideki Takami, Subaru Telescope/National Astronomical Observatory of Japan (United States)
Makoto Watanabe, 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)
Masayuki Hattori, Subaru Telescope/National Astronomical Observatory of Japan (United States)
Miwa Goto, Subaru Telescope/National Astronomical Observatory of Japan (United States)
Masanori Iye, National Astronomical Observatory of Japan (Japan)
Yutaka Hayano, Subaru Telescope/National Astronomical Observatory of Japan (United States)
National Astronomical Observatory of Japan (Japan)
Yukiko Kamata, National Astronomical Observatory of Japan (Japan)
Nobou Arimoto, National Astronomical Observatory of Japan (Japan)
Naoto Kobayashi, Univ. of Tokyo (Japan)
Yosuke Minowa, Univ. of Tokyo (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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