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Proceedings Paper

Visible low-order wavefront sensor for the Subaru LGSAO system
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Paper Abstract

The Subaru laser guide star adaptive optics system (AO188) was installed at the Nasmyth focus of the Subaru Telescope on October 2006 and it is in operation with the natural guide star (NGS) mode. The operation of the laser guide star (LGS) mode started on January 2010. A visible low-order wavefront sensor (LOWFS) was built to measure tip-tilt and defocus terms of wavefront by using a single NGS within a 2.7 arcmin diameter field when an LGS is used for high-order wavefront sensing with the 188-element curvature based wavefront sensor. This LOWFS is a 2 × 2 sub-aperture Shack-Hartmann sensor with 16 photon-counting avalanche photodiode (APD) modules. A 4×4-element lenslet array is located after the 2 × 2 sub-aperture Shack-Hartmann lenslet array and it is coupled with the APD modules through optical fibers. The field of view of the LOWFS is 4 arcsec in diameter. It has own guide star acquisition unit, acquisition and pupil cameras, and atmospheric dispersion corrector. We describe the design, construction, and integration of this low-order wavefront sensor.

Paper Details

Date Published: 29 July 2010
PDF: 8 pages
Proc. SPIE 7736, Adaptive Optics Systems II, 77365H (29 July 2010); doi: 10.1117/12.856845
Show Author Affiliations
Makoto Watanabe, Hokkaido Univ. (Japan)
Meguro Ito, National Astronomical Observatory of Japan/Subaru Telescope (United States)
Shin Oya, National Astronomical Observatory of Japan/Subaru Telescope (United States)
Yutaka Hayano, National Astronomical Observatory of Japan/Subaru Telescope (United States)
Yosuke Minowa, National Astronomical Observatory of Japan/Subaru Telescope (United States)
Masayuki Hattori, National Astronomical Observatory of Japan/Subaru Telescope (United States)
Yoshihiko Saito, National Astronomical Observatory of Japan/Subaru Telescope (United States)
Sebastian Egner, National Astronomical Observatory of Japan/Subaru Telescope (United States)
Hideki Takami, National Astronomical Observatory of Japan/Subaru Telescope (United States)
Masanori Iye, National Astronomical Observatory of Japan (Japan)
Olivier Guyon, National Astronomical Observatory of Japan/Subaru Telescope (United States)
Vincent Garrel, National Astronomical Observatory of Japan/Subaru Telescope (United States)
Stephen Colley, National Astronomical Observatory of Japan/Subaru Telescope (United States)
Taras Golota, National Astronomical Observatory of Japan/Subaru Telescope (United States)


Published in SPIE Proceedings Vol. 7736:
Adaptive Optics Systems II
Brent L. Ellerbroek; Michael Hart; Norbert Hubin; Peter L. Wizinowich, Editor(s)

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