Intracavity KTiOAsO₄ Optical Parametric Oscillator
Pumped by an Actively Q-Switched Nd:YAG Laser¹

W. X. Lan^a, Q. P. Wang^a, Z. J. Liu^a, *, X. Y. Zhang^a, X. B. Wan^a, F. Bai^a, H. B. Shen^a,
G. P. Lv^a, G. F. Jin^a, X. T. Tao^b, and Y. X. Sun^b

^a School of Information Science & Engineering and Provincial Key Laboratory of Laser Technology and Application,
Shandong University, Jinan, 250100, China

^b State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, China

*e-mail: zhaojunliu@sdu.edu.cn

Received October 27, 2011; in final form, October 29, 2011; published online March 6, 2012

Abstract—A KTiOAsO₄ (KTA) intracavity optical parametric oscillator (IOPO) is achieved within a diode
end-pumped acousto-optically Q-switched Nd:YAG laser. With a 25-mm-long X-cut KTA crystal, efficient
parametric conversions to signal (1535 nm) and idler (3467 nm) waves are realized. At an incident diode power
of 14.9 W, the highest output power of 1.83 W including 1.37 W of signal and 0.46 W of idler radiations are
obtained at a repetition rate of 40 kHz, corresponding to a total optical-to-optical conversion efficiency of
12.3%. Rate equations model are used to simulate this system, and the theoretical results agree with the exper-
imental ones.

10.1134/S1054660X12040056

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