热容模式下LD阵列泵浦Nd：GGG圆盘的温度场分析  

Analysis on the temperature field of LD array pumped Nd:GGG disc laser in heat-capacity mode

作　　者：王保松[1] 江海河[1] 张庆礼[1] 孙敦陆[1] 殷绍唐[1] 李林峰[1] 陶少宏 

机构地区：[1]中国科学院安徽光学精密机械研究所,安徽合肥230031

出　　处：《量子电子学报》2007年第6期688-693,共6页Chinese Journal of Quantum Electronics

基　　金：国家自然科学基金(60478025;50472104)资助课题

摘　　要：为了研究Nd:GGG激光晶体圆盘在热容运行模式下的温度场分布及变化问题,根据实际情况建立物理模型进行了分析。从热传导微分方程出发,通过格林函数法求得激光器工作、冷却阶段晶体内部温度场的解析解,在一定程度上可以反映温度场的变化情况。数值计算了矩形LD光斑尺寸3 cm,泵浦功率8100 W、脉冲频率500 Hz、脉冲宽度0.2 ms条件下泵浦4s后圆盘的温度场以及变化曲线,得到4s末的最大应力已经达到晶体断裂极限的47%。采用280K、290K的温度分别对圆盘进行背面冷却时,需要60～70s左右的冷却时间;当采用280K对圆盘进行背面和侧面同时冷却时,冷却时间缩短到30s左右。A physical model was established to study the distribution and change of temperature field of Nd： GGG disc operated under heat-capacity mode. By using heat conducting equation and Green function, the expressions of temperature field inside the crystal were obtained during the operation and cooling period of the laser; the obtained data reflect the change of temperature filed. The temperature field was calculated after the crystal was pumped as long as 4 s under the pump conditions（rectangular LD facula 3 cm, power 8.1 kW, frequency 500 Hz, width 0.2 ms）, and the maximal stress is up to 47% of the crystal rupture limit at the end of 4 s. The cooling time is about 60-70 s when the back of the disc is cooled at the temperature 280 K and 290 K respectively; the cooling time is shorted to be about 30 s when both the back and side of disc were cooled at the temperature 280 K.

关 键 词：激光物理 温度场分析 格林函数法 Nd:GGG激光圆盘 热容模式 

分 类 号：TN248.1[电子电信—物理电子学]