Visible low-order wavefront sensor for the Subaru LGSAO system

Makoto Watanabe; Meguro Ito; Shin Oya; Yutaka Hayano; Yosuke Minowa; Masayuki Hattori; Yoshihiko Saito; Sebastian Egner; Hideki Takami; Masanori Iye; Olivier Guyon; Vincent Garrel; Stephen Colley; Taras Golota

doi:10.1117/12.856845

28 July 2010 Visible low-order wavefront sensor for the Subaru LGSAO system

Makoto Watanabe, Meguro Ito, Shin Oya, Yutaka Hayano, Yosuke Minowa, Masayuki Hattori, Yoshihiko Saito, Sebastian Egner, Hideki Takami, Masanori Iye, Olivier Guyon, Vincent Garrel, Stephen Colley, Taras Golota

Author Affiliations +

Proceedings Volume 7736, Adaptive Optics Systems II; 77365H (2010) https://doi.org/10.1117/12.856845
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

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.

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Makoto Watanabe, Meguro Ito, Shin Oya, Yutaka Hayano, Yosuke Minowa, Masayuki Hattori, Yoshihiko Saito, Sebastian Egner, Hideki Takami, Masanori Iye, Olivier Guyon, Vincent Garrel, Stephen Colley, and Taras Golota "Visible low-order wavefront sensor for the Subaru LGSAO system", Proc. SPIE 7736, Adaptive Optics Systems II, 77365H (28 July 2010); https://doi.org/10.1117/12.856845

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