Intracavity optical parametric oscillator in pulsed regime

For the case of a Q-switched Nd:YAG laser with a KTP parametric oscillator inside the laser cavity, the temporal evolutions of the population inversion and the pump and signal intracavity power were discussed by using the simple model of coupled equations. The results show that the optical parametric oscillator can produce single or multi pulses, depending on the signal cavity finesse and the pumping level. The single and multi pulses were obtained by different signal cavity reflectivity experimentally. The calculating results are in good agreement with the experimental data. The characteristics of intracavity optical parametric oscillator were analyzed.