High-Efficiency Nanosecond Optical Parametric Oscillator
with the Stable Ring Configuration¹

S. G. Li, H. H. Li, X. H. Ma, J. T. Wang, X. L. Zhu, and W. B. Chen*

Research Center of Space Laser Information Technology, Shanghai Institute of Optics and Fine Mechanics,
Chinese Academy of Sciences, Shanghai 201800, China

*e-mail: wbchen@mail.shcnc.ac.cn

Received March 14, 2012; in final form June 3, 2012; published online September 3, 2012

Abstract—High stability nanosecond OPO operation at 1.57 m was realized based on the type II non-criti-
cally phase-matched (NCPM) KTP crystal by utilizing a single frequency Nd:YAG master oscillator power
amplifier (MOPA) laser as pump source. Energy conversion efficiency of 18.1% was demonstrated with single-
pass ring cavity which was approximately two times more than that of critical ring cavity. The highest slope
efficiency of 37.76% and maximum signal pulse energy of 3.1 mJ were attained with the output reflectivity of
R = 50% at the pulse repetition frequency of 100 Hz. Experimental results reveal that the nanosecond OPO with
ring stable configuration is a promising design to meet the need of IPDA’s transmitter.

DOI: 10.1134/S1054660X12100118

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