Internally frequency-doubled hectowatt-level Nd∶YAG/KTP green laser side-pumped by LD

In order to obtain hectowatt-level green laser pumped by laser diode, two-rod series and two-acousto-optic Q-switching Z-shaped resonator was designed. According to the beam transformation matrixes, the variation of the fundamental mode radius in the laser crystal with the diopter and the distribution of the intracavity light field in the tangential and sagittal planes near the frequency-doubled crystal were simulated and calculated. The ideal resonator parameters were successfully sifted out based on the simulation and calculation. On the basis of optimal resonator parameters, the 532nm green laser was acquired, whose highest average power was 174.1W, the pulse width was 160ns, the optical-optical conversion efficiency was 16.1%, and the beam quality factor was M2x＝9.63 and M2y＝9.78, when the total pumping power was 1080W and the repetition rate was 10kHz. The result shows that high-power and high-quality hecto-watt-level green laser can be obtained by two-rod modules and two-acousto-optic Q-switched Zshaped resonator configuration.