High power high beam quality Nd: YAG pulsed laser

In this paper, the purpose of output pulsed laser with high-power and high beam quality is discussed, and the structure of unsymmetrical plane-concave resonator is analyzed theoretically. We have completed the laser, which could output high-power and high beam quality with single Nd: YAG rod pumped by double Xe-lamp and unsymmetrical plane-concave resonator. When the duty cycle was 9%, the average power of laser was nearly 480 W, beam parameters product was better than 12.7 mm·mrad and efficiency of electricity to light was nearly 4%, which matched the theoretical analysis well. The laser could be transmitted by optic fiber of 300 μm core diameter and its instability was less than ±1%. Processing experiment has proved that it had good cutting quality．