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Proceedings Paper

589 nm sum-frequency generation laser for the LGS/AO of Subaru Telescope
Author(s): Yoshihiko Saito; Yutaka Hayano; Norihito Saito; Kazuyuki Akagawa; Akira Takazawa; Mayumi Kato; Meguru Ito; Stephen Colley; Matthew Dinkins; Michael Eldred; Taras Golota; Olivier Guyon; Masayuki Hattori; Shin Oya; Makoto Watanabe; Hideki Takami; Masanori Iye; Satoshi Wada
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Paper Abstract

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.

Paper Details

Date Published: 28 June 2006
PDF: 7 pages
Proc. SPIE 6272, Advances in Adaptive Optics II, 627246 (28 June 2006); doi: 10.1117/12.671964
Show Author Affiliations
Yoshihiko Saito, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Yutaka Hayano, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Norihito Saito, RIKEN - The Institute of Physical and Chemical Research (Japan)
Kazuyuki Akagawa, Megaopto Co., Ltd. (Japan)
Akira Takazawa, Megaopto Co., Ltd. (Japan)
Mayumi Kato, Megaopto Co., Ltd. (Japan)
Meguru Ito, Subaru Telescope, National Astronomical Observatory of Japan (United States)
The Univ. of Tokyo (Japan)
Stephen Colley, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Matthew Dinkins, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Michael Eldred, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Taras Golota, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Olivier Guyon, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Masayuki Hattori, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Shin Oya, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Makoto Watanabe, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Hideki Takami, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Masanori Iye, National Astronomical Observatory of Japan (Japan)
Graduate Univ. for Advanced Studies (Japan)
Satoshi Wada, RIKEN - The Institute of Physical and Chemical Research (Japan)
Megaopto Co., Ltd. (Japan)


Published in SPIE Proceedings Vol. 6272:
Advances in Adaptive Optics II
Brent L. Ellerbroek; Domenico Bonaccini Calia, Editor(s)

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