589 nm sum-frequency generation laser for the LGS/AO of Subaru Telescope

Yoshihiko Saito, Yutaka Hayano, Norihito Saito, Kazuyuki Akagawa, Akira Takazawa, Mayumi Kato, Meguru Ito, Stephen Colley, Mattew Dinkins, Michael Eldred, Taras Golota, Olivier Guyon, Masayuki Hattori, Shin Oya, Makoto Watanabe, Hideki Takami, Masanori Iye, Satoshi Wada

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

15 Scopus citations


We developed a high power and high beam quality 589 nm coherent light source by sum-frequency generation in order to utilize it as a laser guide star at the Subaru telescope. The sum-frequency generation is a nonlinear frequency conversion in which two mode-locked Nd:YAG lasers oscillating at 1064 and 1319 nm mix in a nonlinear crystal to generate a wave at the sum frequency. We achieved the qualities required for the laser guide star. The power of laser is reached to 4.5 W mixing 15.65 W at 1064 nm and 4.99 W at 1319 nm when the wavelength is adjusted to 589.159 nm. The wavelength is controllable in accuracy of 0.1 pm from 589.060 and 589.170 nm. The stability of the power holds within 1.3% during seven hours operation. The transverse mode of the beam is the TEM00 and M2 of the beam is smaller than 1.2. We achieved these qualities by the following technical sources; (1) simple construction of the oscillator for high beam quality, (2) synchronization of mode-locked pulses at 1064 and 1319 nm by the control of phase difference between two radio frequencies fed to acousto-optic mode lockers, (3) precise tunability of wavelength and spectral band width, and (4) proper selection of nonlinear optical crystal. We report in this paper how we built up each technical source and how we combined those.

Original languageEnglish (US)
Title of host publicationAdvances in Adaptive Optics II
StatePublished - 2006
EventAdvances in Adaptive Optics II - Orlando, FL, United States
Duration: May 24 2006May 31 2006

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume6272 III
ISSN (Print)0277-786X


OtherAdvances in Adaptive Optics II
Country/TerritoryUnited States
CityOrlando, FL


  • 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


Dive into the research topics of '589 nm sum-frequency generation laser for the LGS/AO of Subaru Telescope'. Together they form a unique fingerprint.

Cite this