高功率高光束质量脉冲Nd:YAG激光器

High power high beam quality Nd: YAG pulsed laser

以实现高功率、高光束质量的脉冲激光输出为目的,对非对称平-凹谐振腔的结构进行了理论分析。设计出了高功率、高光束质量非对称放置的平-凹谐振腔、双氙灯泵浦的脉冲Nd:YAG激光器。当占空比为9%时,实现输出激光平均功率近480 W,光束参数积优于12.7 mm.mrad,电光转化效率近4%,与理论分析吻合,可用芯径300μm的光纤传输,不稳定性优于±1%。加工实验证明有较好的质量:切割材料为不锈钢,厚度为3 mm时、切割速度为0.6 m/min和厚度为1.5 mm、切割速度为1.2 m/min时,两种情况下所得切缝宽度均为250μm,且切割上下沿光滑。

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.