Compact High Conversion Efficiency Nd:YAG/LBO Green
Laser Using Unstable V Cavity¹

B. Ji, X. S. Zheng, Z. P. Cai, H. Y. Xu, and F. Q. Jia*

Department of Electronic Engineering, School of Information Science and Technology, Xiamen University,
Xiamen, China 361005

*e-mail: jiafq@xmu.edu.cn

Received September 13, 2011; in final form, September 14, 2011; published online December 28, 2011

Abstract—We demonstrated a 36.9 W green laser with an intra-cavity second harmonic generation. A compact
unstable V type cavity was adopted to compress the whole cavity configuration. The type I phase-matching
LiB₃O₅ was used as the nonlinear crystal in the second harmonic generation. The 36.9 W average power and
38 ns pulse width of 532 nm green laser was obtained at a repetition rate of 10.3 kHz, corresponding to a peak
power of 94 kW. The optical to optical conversion efficiency from diode to green and from IR to green laser
was about 19.8 and 82%, the whole cavity length is about 300 mm. To the best of our knowledge, this is the
shortest cavity configuration of side pump green system with output power higher than 30 W and IR to green
conversion efficiency larger than 80%. The output fluctuation of this system was less than 3% in 2 h.

DOI: 10.1134/S1054660X12020119

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