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为研究激光二极管抽运的大能量重复频率Yb:YAG激光器的关键单元技术,建立了焦耳级10 Hz“V”型有源镜(AM)构型Yb:YAG激光器。设计了一套空心导管抽运耦合系统,获得了90%的抽运耦合效率。设计了水冷增益介质的热管理方案,10 Hz自由振荡模式工作时获得3.3 J激光输出,光-光转换效率27.5%,相对1 Hz重复频率工作(4.4 J)能量仅下降了25%。对“正”、“背”面抽运两种构型的实验研究结果表明,“正”面抽运对介质热效应的抑制弱于“背”面抽运,与计算结果一致,但“正”面抽运效率高,无镀膜难题,更有利于工程化。
In order to study the key element technology of Yb: YAG laser with large energy repetition rate for laser diode pumping, a Yb: YAG laser with 10 Hz / “V” type active mirror was fabricated. A hollow catheter pumping coupling system was designed with 90% pump coupling efficiency. A thermal management scheme for water-cooled gain media was designed. The 3.3 J laser output was obtained at 10 Hz free-oscillation mode, with a light-to-light conversion efficiency of 27.5% and only a 25% reduction in energy at a 4.4 J operation at 1 Hz repetition rate. Experimental results on two configurations of pumped positive, positive and negative pumping show that the suppression of the thermal effect on the medium is weaker than the pump on the back side of the pump, The calculation results are consistent, but “positive ” surface pumping efficiency, no coating problems, more conducive to engineering.