Theoretical and Experimental Studies on Passively
Q-Switched KTiOAsO₄ Optical Parametric Oscillator¹

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

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

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

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

Received January 23, 2012; published online May 11, 2012

Abstract—A passively Q-switched intracavity optical parametric oscillator based on KTiOAsO₄ (KTA) crystal
is studied theoretically and experimentally. The rate-equation-based theoretical model is established to describe
the time evolutions of the population inversion density of the laser crystal, ground-state population density of
the saturable absorber, fundamental photon density, signal photon density and the idler photon density. In the
experiment, a laser diode-end pumped, passively Q-switched Nd:YAG/KTA IOPO with a Cr⁴⁺:YAG crystal as
the saturable absorber is realized to verify this model. The characteristics including the output power, the pulse
repetition rate, the pulse width and the beam quality were investigated for this OPO. The experimental results
for the output power and the repetition rate agree with the theory well. And both results show that with same
pumping level the idler pulse width is shorter than the signal one.

DOI: 10.1134/S1054660X1206014X

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