对称多通泵浦双包层Yb:YAG平面波导放大器

Symmetrical Multi-Pass-Pump Double-Clad Yb:YAG Planar Waveguide Amplifier

设计了一种高功率多通泵浦Yb:YAG平面波导激光放大器。所设计的放大器采用对称泵浦方案,泵浦源对称分置于平面波导两侧,泵浦光在平面波导中经反射多次通过芯层以实现多通泵浦。分析了泵浦吸收特性的影响因素,推导了平面波导几何参数间的约束关系,并对平面波导结构进行了优化。使用激光放大模型分析了所设计平面波导放大器的泵浦吸收特性、温度特性及放大输出特性。结果显示:所设计多通泵浦平面波导放大器具有高泵浦吸收率,以及高的光-光转换效率,当注入种子光功率为200 W,泵浦功率为10 kW时,对称多通泵浦平面波导的泵浦吸收率最大值为96.8%,对应的放大输出功率为7483 W,光-光转换效率为72.8%;同时,良好的吸收均匀性使其受热效应的影响更小,有利于获得高质量的光束。

A high-power multi-pass-pump Yb:YAG planar waveguide laser amplifier was designed.The new amplifier adopted symmetrical pumping scheme,in which the pump sources were symmetrically placed on both sides of the planar waveguide.The pump light,reflected in the planar waveguide,passed through the core multiple times.Multi-pass pump was thereby achieved.The factors affecting the pump absorption characteristics were analyzed,and the relationships between the geometric parameters of the planar waveguide were determined.The planar waveguide structure was optimized.The pump absorption,temperature,and output amplification characteristics of the planar waveguide amplifier were analyzed by a laser amplification model.The results show that the designed multi-pass-pump planar waveguide amplifier has high pump absorption and optical-to-optical efficiencies.When the power of the injected seed light is 200 W and the pumping power is 10 kW,its maximum pump absorption efficiency is 96.8%,with a corresponding amplified output power of 7483 W and an optical-to-optical efficiency of 72.8%.Meanwhile,a good absorption uniformity makes the amplifier less affected by the heating effect,which is beneficial to obtaining high-quality beams.