高功率高光束质量脉冲Nd: YAG激光器
High power high beam quality Nd: YAG pulsed laser
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摘要: 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300 μm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250 μm，且切割上下沿光滑。Abstract: 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．
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Key words:
- pulsed solid laser /
- nd: yag /
- resonator /
- thermal focal length /
- beam quality
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