刻螺纹对Nd∶YAG晶体棒输出功率影响的实验研究

Study on Effect of Groove on Nd∶YAG Crystal Rods' Output Power

针对Nd∶YAG棒刻螺纹是否能改善激光器的输出,理论上分析了Nd∶YAG晶体棒内热传导过程及影响其冷却效果的因素。给出了表面刻上螺纹后,Nd∶YAG晶体棒表面积的变化结果和其对表面冷却换热方式的改变。对使用螺纹棒的激光器输出进行了实验研究,与普通棒的实验结果对比发现:用螺纹棒比用普通棒时平均功率大了23.2%,发散角小了3mrad。说明激光棒的表面刻槽可以提高冷却效果,有效地提高了激光器的输出。

In view of whether groove on Nd：YAG crystal rods can improve the output of the laser, the process of heat conduction of Nd： YAG crystal rods and the factors of cooling efficiency are analyzed in this paper. The change of the surface area of Nd： YAG crystal rods and that of the style of thermal cooling exchange are studied as well. Experimental results of the laser output with grooved Nd： YAG rod are obtained. Comparing with the results of ordinary rods, the result shows that the average power increases 23.3 %, and the far-field divergence angle decreases 3 mrad. The method which groove on the surface of the Nd： YAG rod can improve the output of the laser.