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Proceedings Paper

Design of the Subaru laser guide star adaptive optics module
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Paper Abstract

The laser guide star adaptive optics (AO) module for the Subaru Telescope will be installed at the f/13.9 IR Nasmyth focus, and provides the compensated image for the science instrument without change of the focal ratio. The optical components are mounted on an optical bench, and the flexure depending on the telescope pointing is eliminated. The transferred field of view for the science instrument is 2 arcmin diameter, but a 2.7 arcmin diameter field is available for tip-tilt sensing. The science path of the AO module contains five mirrors, including a pair of off-axis parabolic mirrors and a deformable mirror. It has also three additional mirrors for an image rotator. The AO module has a visible 188-element curvature based wavefront sensor (WFS) with photon-counting avalanche photodiode (APD) modules. It measures high-order terms of wavefront using either of a single laser (LGS) or natural guide star (NGS) within a 2 arcmin diameter field. The AO module has also a visible 2 x 2 sub-aperture Shack-Hartmann WFS with 16 APD modules. It measures tip-tilt and slow defocus terms of wavefront by using a single NGS within a 2.7 arcmin diameter field when a LGS is used for high-order wavefront sensing. The module has also an infrared 2 x 2 sub-aperture Shack-Hartmann WFS with a HgCdTe array as an option. Both high- and low-order visible WFSs have their own guide star acquisition units with two steering fold mirrors. The AO module has also a source simulator. It simulates LGS and NGS beams, simultaneously, with and without atmospheric turbulence by two turbulent layer at about 0 and 6 km altitudes, and reproduces the isoplanatism and the cone effect for the LGS beam.

Paper Details

Date Published: 25 October 2004
PDF: 9 pages
Proc. SPIE 5490, Advancements in Adaptive Optics, (25 October 2004); doi: 10.1117/12.551032
Show Author Affiliations
Makoto Watanabe, Subaru Telescope/National Astronomical Observatory of Japan (United States)
Hideki Takami, 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)
Nobuo 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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