激光二极管双端双程抽运Yb∶YAG板条激光器

Laser Diode Double-Pass Double-End Pumped Yb∶YAG Slab Laser

报道了一种激光二极管阵列双端双程抽运Yb∶YAG板条激光器。基于抽运光在晶体中的吸收特性,建立双端双程抽运与双端单程抽运结构的抽运分布模型,理论分析了双端双程抽运的优点。在抽运光重复频率为400 Hz、脉宽为1 ms、单脉冲总能量为12 J的条件下,利用偏振复用技术实现双端双程抽运板条激光器,获得单脉冲激光的输出能量约为6.13 J,光-光转化效率约为50%。与具有相同掺杂浓度以及相同抽运光吸收效率的双端单程抽运方式相比,双端双程抽运的输出激光能量更高,转化效率更高,稳定性更强。理论分析与实验结果证明双端双程抽运方式有利于进一步提升激光输出的能量与效率。

This study reports a laser diode array(LDA) double-pass double-end pumped Yb∶YAG slab laser. Pump distribution models of double-and single-pass double-end pump structures are created based on the absorption characteristics of the pump in the medium. The advantages of a double-pass double-end pump are theoretically analyzed. Under the pump frequency of 400 Hz, pulse width of 1 ms, and single pump energy of 12 J, the polarization multiplexing technology is used to realize the double-pass and double-end pump slab laser. The output laser energy is about 6.13 J with an optical-optical conversion of 50%. In comparison with a single-pass double-end pump mode with the same doping concentration and absorption efficiency of the pump light, the double-pass double-end structure demonstrates the advantages of higher laser energy, higher optical conversion efficiency, and greater stability. The theoretical analysis and experimental results prove that the utilization of the double-pass double-end pump can further improve laser output energy and efficiency.