Abstract

We report a high-repetition-rate optical parametric generator (OPG) with a periodically poled lithium niobate (PPLN) crystal pumped by an acousto-optically Q-switched CW-diode-end-pumped Nd:YVO4 laser. For the maximum 1064nm pump power of 970mW, the maximum conversion efficiency is 32.9% under the conditions of 250 degrees C, 1064nm pulse repetition rate of 22.6kHz and pulse width of 12ns and the PPLN OPG threshold in the collinear case is less than 23.7?J. The output power increases with the increase of the crystal temperature. The 1485?1553nm signal wave and 3383?3754nm idler wave are obtained by changing the temperature and the angle of the PPLN crystal.

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