High-Repetition-Rate Mid-Infrared Optical Parametric
Oscillator Based on PPMgOLN¹

Y. T. Dong, Z. Xiang*, C. Liu, Z. G. Zhao, S. Q. Pan, and J. Chen

The State Key Laboratory of Modern Optical Instrumentation, Zhejiang University,
Hangzhou 310027, China

*e-mail: xiangzhen_zju@163.com

Received December 15, 2011; in final form, December 28, 2011; published online September 3, 2012

Abstract—A compact source of high-repetition-rate, high-efficiency, mid-infrared optical parametric oscilla-
tor (OPO) based on periodically poled MgO-doped lithium niobate (PPMgOLN) was reported. To ensure high
conversion efficiency at high repetition rate, a high beam quality and high peak power Q-switched pump source
was developed specially. The performances at different repetition rates were compared and average output
power of 8.7 W at 3.8 m was obtained when the pump power was 48 W at the repetition rate of 120kHz with
an optimal plane-concave resonator configuration. The conversion efficiency from the 1.06 m laser to the 3.8
m laser was 18.1%.

DOI: 10.1134/S1054660X12100064

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