1.8 m Optical Parametric Oscillator Based on KTiOPO₄¹

Fen Bai^a, Qingpu Wang^a, Zhaojun Liu^a, Xingyu Zhang^a, Xuebin Wan^a, Weixia Lan^a,
Hongbin Shen^a, SaSa Zhang^{a, b}, and Guofan Jin^a

^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 February 19, 2011; in final form, July 11, 2012

Abstract—A 1.8 m optical parametric oscillator pumped by a diode end-pumped acousto-optically
Qswitched Nd:YAG is demonstrated. A 30-mm-long KTiOPO₄ crystal cut with an angle of = 59.4, =0 is
employed as the OPO crystal. 685 mW signal laser at 1.8 m is obtained at the diode pump power of 13 W and
the pulse repetition rate of 25 kHz. Simultaneously, 265 mW idler emission at 2.6 m is obtained. The corre-
sponded diode-to-OPO conversion efficiency is 7.3%. The pulse width of the signal and idler wave are mea-
sured to be 4.5 and 2.5 ns, respectively. This gives a peak power of 6.1 and 4.2 kW, respectively.

DOI: 10.1134/S1054660X12120031

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