钕玻璃的热致断裂及泵浦极限  

Thermal fracture and pump limit of Nd:glass

作　　者：王明哲[1,2] 马文[1] 张永亮[2] 李明中[2] 谭吉春[1] 景峰[2] 

机构地区：[1]国防科学技术大学理学院,长沙410073 [2]中国工程物理研究院激光聚变研究中心,四川绵阳621900

出　　处：《强激光与粒子束》2011年第5期1167-1172,共6页High Power Laser and Particle Beams

摘　　要：以激光介质的第一主应力为评判标准,依据Griffith微裂纹理论作为断裂临界应力,基于已报道的断裂实验数据和3维、瞬态的有限元计算,建立了预测一定泵浦参数下钕玻璃断裂可能性的Weibull统计模型,同时分析了影响介质泵浦极限的其它因素。结果表明:材料的抛光工艺决定了介质的断裂应力;对于短脉冲大能量方式工作的钕玻璃介质,基于美国2 0世纪9 0年代的抛光水平,1 Hz以下低重频时应优先考虑18 kW.cm-2的泵浦饱和极限,10 Hz以上高重频时应优先考虑介质的断裂极限。Based on published fracture experiments and 3D transient finite-element analyses,and taking the first principal stress as the criterion and the Griffith crack theory to determine the critical fracture stress,a Weibull statistical model is established to predict the fracture possibility of Nd：glass with certain pump parameters.Other issues which limit the pump power are also presented.The results show that the fracture limit of laser medium depends on the optical polishing technology.For a short pulse and high energy Nd：glass laser,taking America＇s polishing technology in the 1990s as reference,the pump saturation limits the pump power to 18 kW/cm2 when the repetition rate is lower than 1 Hz,while the thermal fracture limits the pump power when the repetition rate is higher than 10 Hz.

关 键 词：热致断裂 固体激光器 热管理 泵浦极限 钕玻璃 

分 类 号：TN248[电子电信—物理电子学]