Design of laser system for subaru LGS AO

Yutaka Hayano, Yoshihiko Saito, Norihito Saito, Kazuyuki Akagawa, Yukiko Kamata, Tomio Kanzawa, Tomio Kurakami, Naruhisa Takato, Steve Colley, Michael Eldred, Thomas Kane, Olivier Guyon, Shin Oya, Makoto Watanabe, Masayuki Hattori, Taras Golota, Matthew Dinkins, Naoto Kobayashi, Yousuke Minowa, Miwa GotoNobuo Arimoto, Satoshi Wada, Hideki Takami, Masanori Iye

Research output: Contribution to journalConference articlepeer-review

26 Scopus citations


We present the development status of the laser system for Subaru Laser Guide Star Adaptive Optics System. We are manufacturing the quasi-continuous-wave sum frequency laser as a prototype. The optical efficiency of sum frequency generation normalized by the mode-locked fundamental YAG (1064 nm) laser output power is achieved to be 14 % using the non-linear crystal, periodically poled potassium titanyl phosphate (PPKTP). Output power at sodium D2 line was about 260 mW. The optical relay fiber and the laser launching telescope are also described in this paper. For the optical relay fiber, we are testing an index guided photonic crystal fiber (PCF), whose core material is filled by fused silica, and whose clad has close-packed air holes in two dimension. The coupling efficiency was evaluated as about 80 % using 1mW He-Ne laser. We introduce the design of laser launching telescope (LLT), which is a copy of VLT laser launching telescope, and the interface to the Subaru Telescope.

Original languageEnglish (US)
Article number118
Pages (from-to)1088-1095
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Issue numberPART 3
StatePublished - 2004
EventAdvancements in Adaptive Optics - Glasgow, United Kingdom
Duration: Jun 21 2004Jun 25 2004


  • Adaptive optics
  • Laser guide star
  • Photonic crystal fiber
  • Subaru telescope
  • Sum-frequency 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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