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报道了一台输出功率超过1.5kW的激光二极管抽运Nd∶YAG双薄片激光器。设计了四通光学耦合系统,通过优化经微柱透镜准直后光束的发散角,实现了抽运光的近平顶分布。薄片激光介质镀完介质膜后镀Ti,Pt,Au实现金属化,再采用铟焊工艺焊接在铜微通道冷却器上,以提高散热效率和冷却的均匀性。采用两片直径40mm,厚度1.3mm的Nd∶YAG薄片激光介质,在两个二极管激光器阵列抽运下,当每个薄片上的抽运峰值功率为17.7kW,占空比10%时,获得了平均功率1.52kW的准连续激光输出,光-光转换效率达到43%,电-光转换效率超过20%。
Reported a laser diode pumped Nd:YAG double-sheet laser with an output of more than 1.5kW. A four-way optical coupling system is designed. By optimizing the divergence angle of the light beam collimated by the micro-cylindrical lens, the nearly flat-topped distribution of the pumping light is achieved. The lamellar laser medium is plated on the dielectric film and plated with Ti, Pt and Au, and then soldered on the copper microchannel cooler by the indium welding process to improve the cooling efficiency and the uniformity of the cooling. Two Nd: YAG lamellae with a diameter of 40 mm and a thickness of 1.3 mm were obtained using two diode laser arrays with pumping power of 17.7 kW and duty cycle of 10% on each sheet The quasi-continuous laser output with an average power of 1.52kW achieves a light-to-light conversion efficiency of 43% and an electro-optical conversion efficiency of over 20%.