High-Power Mid-Infrared Tunable Optical Parametric
Oscillator Based on 3-mm-Thick PPMgCLN¹

Y. F. Peng*, X. B. Wei, D. M. Li, and W. M. Wang

Institute of Applied Electronics, China Academy of Engineering Physics,
P. O. Box 919-1013, Mianyang Sichuan, 621900 China

*e-mail: qiaopyf@yahoo.com.cn

Received July 12, 2011; in final form, July 25, 2011; published online November 28, 2011

Abstract—The experimental results of a high-power tunable mid-IR laser are presented. The optical paramet-
ric oscillator (OPO) with a 3-mm-thick PPMgCLN crystal was pumped by a 1.064 m pulse laser. When the
pump power of the 1.064 m laser was 151 W at 10 kHz, and the operating temperature of the PPMgCLN with
5% MgO doping was 100C, average output power of 23.7 W at 3.91 m was obtained with a slope efficiency
of 18.2% for the idler resonant OPO. The variation of the 3.91 m output power was about 4% in 10min con-
tinuous operation. The beam quality factor M² was less than 2.6. The average output power of 27.4W at 3.91
m was also obtained with 151 W pump power and the slope efficiency of 20.9% for the signal resonant OPO
by changing the coating parameters of the OPO cavity mirrors. The mid-IR wavelength tunability of 3.7–4.0
m can be achieved by adjusting the temperature of a 29 m period PPMgCLN crystal from 200 to 30C.

DOI: 10.1134/S1054660X1201015X

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