Walk off Compensation, Multicrystal, Cascaded, Single Pass,
Second Harmonic Generation in LBO¹

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, 361005 China

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

Received November 18, 2011; in final form, January 5, 2012; published online August 1, 2012

Abstract—Walk off compensation and multi crystal (MC) cascaded single pass second harmonic generation
(SP-SHG) in LBO was combined to improve the SHG conversion efficiency. We report a simple and compact
implementation for (SP-SHG) of radiation, based on a cascaded multicrystal (MC) scheme that can provide
high conversion efficiency without other focusing device, the enhancement factor of 2.9 was realized. At an
incident pump power of 20 W, the average power of 6.1 W and pulse width of 12 ns green laser was obtained
at a repetition rate of 42.4 kHz, corresponding to a peak power of 12 kW and single pulse energy of 144 J. The
optical to optical conversion efficiency from diode to green and from IR to green laser are about 30.5 and 67.8%,
the whole length of this system is about 150 mm, the output fluctuation of this system is less than 5% in 2 h.

DOI: 10.1134/S1054660X12090058

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