对激光二极管(LD)阵列5向侧面对称抽运Nd:YAG薄片激光器进行了实验和模拟研究。薄片激光器的耦合系统由消像差透镜组和空心光波导组成,采用15 mm×1.5 mm的Nd:YAG薄片进行初步实验,实验得到薄片激光器的激光输出平均功率为65.7 W,光-光转换效率为10.5%,同时增益介质内具有较理想的荧光分布。同时考虑激光二极管在快轴和慢轴方向的发散特性及增益介质侧面的散射特性,采用光线追迹法,模拟并分析了增益介质内抽运光分布,模拟结果表明耦合系统具有88.3%的耦合效率,同时增益介质内具有较理想的抽运光分布,且与实验结果相吻合。

The five laser-diode (LD) arrays symmetrically side-pumped Nd:YAG thin disk laser is investigated experimentally and simulatively. The coupling system is composed of astigmatic lenses and hollow wave-guide, and a 15 mm×1.5 mm Nd:YAG disk was used during the primary experiment. The average output power of the disk laser was 65.7 W in experiment with 10.5% optical-to-optical efficiency, and there is good fluorescence distribution in medium. The pump distribution of thin disk is obtained and analyzed by the ray tracing method. The divergence characteristics of the fast axis and the slow axis of LD and the scattering characteristic of thin disk side are homogeneously considered during the simulation. The simulation shows that the coupling efficiency of the coupling system is 88.3%, and the pump distribution in thin disk is ideal, which is accordant to the experimental result.