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Proceedings Article

Laser guide star AO project at the Subaru Telescope

[+] Author Affiliations
Hideki Takami, Makoto Watanabe, Naruhisa Takato, Stephen Colley, Michael Eldred, Thomas Kane, Olivier Guyon, Masayuki Hattori, Miwa Goto

Subaru Telescope/National Astronomical Observatory of Japan (USA)

Masanori Iye, Yukiko Kamata, Nobou Arimoto

National Astronomical Observatory of Japan (Japan)

Yutaka Hayano

Subaru Telescope/National Astronomical Observatory of Japan (USA) and National Astronomical Observatory of Japan (Japan)

Naoto Kobayashi, Yosuke Minowa

Univ. of Tokyo (Japan)

Proc. SPIE 5490, Advancements in Adaptive Optics, 837 (October 25, 2004); doi:10.1117/12.550839
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From Conference Volume 5490

  • Advancements in Adaptive Optics
  • USA | June 21, 2004

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.

© (2004) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Hideki Takami ; Makoto Watanabe ; Naruhisa Takato ; Stephen Colley ; Michael Eldred, et al.
"Laser guide star AO project at the Subaru Telescope", Proc. SPIE 5490, Advancements in Adaptive Optics, 837 (October 25, 2004); doi:10.1117/12.550839; http://dx.doi.org/10.1117/12.550839


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