Development of all-solid-state coherent 589 nm light source: toward the realization of sodium lidar and laser guide star adaptive optics

Norihito Saito; Kazuyuki Akagawa; Mayumi Kato; Akira Takazawa; Yutaka Hayano; Yoshihiko Saito; Meguru Ito; Hideki Takami; Masanori Iye; Satoshi Wada

doi:10.1117/12.697363

12 December 2006 Development of all-solid-state coherent 589 nm light source: toward the realization of sodium lidar and laser guide star adaptive optics

Norihito Saito, Kazuyuki Akagawa, Mayumi Kato, Akira Takazawa, Yutaka Hayano, Yoshihiko Saito, Meguru Ito, Hideki Takami, Masanori Iye, Satoshi Wada

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Proceedings Volume 6409, Lidar Remote Sensing for Environmental Monitoring VII; 64091H (2006) https://doi.org/10.1117/12.697363
Event: SPIE Asia-Pacific Remote Sensing, 2006, Goa, India

Abstract

We report an all-solid-state coherent 589 nm light source in single-pass sum-frequency generation (SFG) with actively mode-locked Nd:YAG lasers for the realization of sodium lidar and laser guide star adaptive optics. The Nd:YAG lasers are constructed as a LD-side-pumped configuration and are operated at 1064 and 1319 nm for 589 nm light generation in SFG. Output powers of 16.5 and 5.3 W at 1064 and 1319 nm are obtained with two pumping chambers. Each chamber consisted of three 80-W-LD arrays. Single transverse mode TEM₀₀; M² ~1.1 is achieved with adjustment of cavity length considering thermal lens effect with increase of input LD power. The cavity length is set to approximately 1 m. Accordingly the mode-locked lasers are operated at a repetition rate of approximately 150 MHz. Synchronization of two pulse trains at 1064 and 1319 nm is accomplished by control of phase difference between two radio frequencies input in acousto-optic mode-lockers. Then temporal delay is controlled with a resolution of 37 ps/degree. Pump beams are mixed in periodically poled stoichiometric lithium tantalate (PPSLT) without an antireflection coating. The effective aperture and length of the crystal are 0.5 × 2 mm² and 15 mm. When input intensity is set at 5.6 MW/cm , an average output power of 4.6 W is obtained at 589.159 nm. Precise tuning to the sodium D₂ line is accomplished by thermal control of etalons set in the Nd:YAG lasers. The output power at 589.159 nm is stably maintained within ±1.2% for 8 hours.

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Norihito Saito, Kazuyuki Akagawa, Mayumi Kato, Akira Takazawa, Yutaka Hayano, Yoshihiko Saito, Meguru Ito, Hideki Takami, Masanori Iye, and Satoshi Wada "Development of all-solid-state coherent 589 nm light source: toward the realization of sodium lidar and laser guide star adaptive optics", Proc. SPIE 6409, Lidar Remote Sensing for Environmental Monitoring VII, 64091H (12 December 2006); https://doi.org/10.1117/12.697363

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KEYWORDS

Sodium

Mode locking

Nd:YAG lasers

Light sources

Adaptive optics

LIDAR

Nonlinear crystals

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