Yb^(3+):YAG片状激光器的温度效应及金刚石窗口冷却设计(英文)  

Temperature effect of Yb^(3+):YAGslab laser and diamond windowcooling design*

作　　者：曹丁象[1] 於海武[2] 郑万国[2] 贺少勃[2] 王小峰[1] 

机构地区：[1]国防科学技术大学光电科学与工程学院,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》2006年第4期553-558,共6页High Power Laser and Particle Beams

摘　　要：基于准三能级速率方程分析了Yb3+:YAG片状激光器的温度效应,结果表明随着激光介质的温度由300 K升高到400 K,激光器的储能提取效率由43%下降到26%。提出了利用热传导性能及优异的金刚石窗口对激光片的两端面进行冷却设计。模拟结果表明对掺杂11.6%厚度为1.2 mm的激光片在泵浦功率密度为15 kW/cm2,重复频率为10 Hz的条件下,要将最高温度控制在可接受的范围内(比如320 K),周围冷却水的对流换热系数不应小于2 kW/(m2.K)。模拟结果还表明,在相同的热功率密度和冷却条件下,减小激光片的厚度同时增加抽运光的传输次数可以明显的降低激光片的温度。The temperature-related laser performances of the Yb^3＋：YAG slab laser have been investigated based on quasi-three level rate equation model, which include the energy storage and extraction efficiency. The results show that the extractable energy storage efficiency decreases significantly from 43% to 26% with the increase of the temperature in the lasing slab from 300 to 400 K. We also have demonstrated the feasibility of double-face cooling of lasing slab with a diamond window whose thermal conductivity is so high that a very thin plate suffices to efficiently remove the heat generated in the lasing slab. Simulation results show that with a pump intensity of 15 kW/cm^2 and repetition rate of 10 Hz, to keep the maximum temperature of the lasing slab below a reasonable value, e.g. , less than 320 K, the heat exchange coefficient of water should not be less than 2 000 W/（m^2 · K）. The results also show that under the same cooling condition reducing the thickness of the lasing slab and simultaneously increasing the number of pump passes can effectively reduce the temperature of lasing slab.

关 键 词：准三能级固体激光 高功率 温度效应 冷却 金刚石窗口 激光二极管抽运 

分 类 号：TN248.1[电子电信—物理电子学]