Effect of transit time on characteristics of the output pulse in anactively Q-switched Nd:YVO_4laser with acoustic-optic modulator

摘要

By considering the AO switch as a low speed switch and the AO turnoff time including the transit time of the acoustic-wave and the electronic turnoff time as well as the Gaussian spatial distribution of the intra-cavity photon density, thecoupled equations of a Laser-diode pumped actively Q-switched Nd:YVO_4laser with acoustic-optic modulator aregiven. By changing the position of AO in the cavity for changing the transit time of the acoustic-wave, the effect of theAO transit time on the characteristics of the output Q-switched pulse is obtained. It is show that the longer transit timeleads to the wider pulse duration. In the experiment, a laser-diode-pumped actively Q-switched Nd:YVO_4laser withacoustic-optic modulator is realized, and the experimental results are in fair agreement with the numerical solutions.