The performance of the laser guide star system for the Subaru Telescope

Yoshihiko Saito, Yutaka Hayano, Meguru Ito, Yosuke Minowa, Sebastian Egner, Shin Oya, Makoto Watanabe, Masayuki Hattori, Vincent Garrei, Kazuyuki Akagawa, Olivier Guyon, Stephen Colley, Taras Golota, Norihito Saito, Akira Takazawa, Mayumi Ito, Hideki Takami, Satoshi Wada, Masanori Iye

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations


We are developing a laser guide star (LGS) system for the 188-elements Adaptive Optics system (A0188) of the Subaru telescope. In this paper we describe the results of the performance tests of the LGS system. The beam that excites sodium atoms at 90 km altitude of the LGS is generated by the following sequence. The source of the beam is a quasi-CW mode locked sum-frequency generating 589 nm laser. This laser beam propagates through a diagnostics system for measuring the wavelength and the beam quality. Then it couples into a solidcore photonic crystal fiber cable for transmitting the beam to a telescope for launching the beam (LLT: Laser Launching Telescope). The output beam from this fiber cable is collimated by the optics mounted on the LLT. This collimated beam is expanded by the LLT and launched into the sky. We executed several engineering observations of the LGS system from 2009 for confirming the performance of all the components in this sequence. We also report the quality of the LGS.

Original languageEnglish (US)
Title of host publicationAdaptive Optics Systems II
EditionPART 1
StatePublished - 2010
EventAdaptive Optics Systems II - San Diego, CA, United States
Duration: Jun 27 2010Jul 2 2010

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
NumberPART 1
ISSN (Print)0277-786X


OtherAdaptive Optics Systems II
Country/TerritoryUnited States
CitySan Diego, CA


  • Adaptive optics
  • Laser guide star
  • Sodium laser

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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