1.5kW激光二极管抽运Nd∶YAG薄片激光器

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%。

1.5 kW Laser Diode-Pumped Nd:YAG Disk Laser

A laser diode (LD)-pumped Nd:YAG double-disk laser with an average output power of more than 1.5 kW is reported in this paper. A nearly flat top pump profile is achieved with a good design for the four-pass optical coupling system. The disk is coated with Ti, Pt and Au at the back side of the disk which is high-reflectively (HR) coated for the wavelength of the pump and laser radiation, then is welded to the Cu-micro-channel cooler by indium-welding technology. An average output power of 1.52 kW is obtained from two disks with a diameter of 40 mm and a thickness of 1.3 mm. The pumping peak power on each disk is 17.7 kW with duty cycle of 10%. The optical efficiency of the laser system is about 43% and the electrical to optical efficiency is more than 20%.