激光二极管端面抽运的焦耳级10 Hz“V”型水冷Yb:YAG激光器  

10 Hz Joule-Class Laser Diode End-Pumped V-Shaped Water-Cooled Yb:YAG Oscillator

作　　者：段文涛[1] 蒋新颖[1] 蒋东镔[1] 郑建刚[1] 李明中[1] 於海武[1] 

机构地区：[1]中国工程物理研究院激光聚变研究中心,四川绵阳621900

出　　处：《中国激光》2010年第1期44-48,共5页Chinese Journal of Lasers

摘　　要：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 problems of rep-rated high power laser-diode-pumed Yb：YAG laser,a 10 Hz joule-class V-shaped water-cooled Yb：YAG oscillator with active mirror（AM） configuration is demonstrated.An efficient hollow duct coupling system for 12 kW LD was designed and the coupling efficiency is 90%.3.3 J /10 Hz output energy with 27.5% optical-optical efficiency has been achieved in free running regime,which shows that the thermal effects within the Yb：YAG crystal are well managed by the cooling system of the laser head compared with 4.4 J /1 Hz output energy.The experimental results about two kinds of pumping architectures show that the front-pumped architecture is less effective to decrease the average temperature and its gradient within the gain medium than the rear-pumped architecture which accords basically with our prediction,but the front-pumped is more efficient and has no dichromatic coating′ issues which are helpful to be implemented easily.

关 键 词：固体激光器 激光二极管抽运 YB:YAG晶体 热管理 

分 类 号：TN248.1[电子电信—物理电子学]