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.
出处
《量子电子学报》
CAS
CSCD
北大核心
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
作者简介
王保松（1981-），男，河北人，硕士研究生，主要从事晶体材料物性与激光技术研究。E—mail：wbs6268@yahoo．com．cn
导师：江海河（1961-），男，研究员，主要从事激光物理、激光技术、光电测量等方面的研究。E—mail：hjiang@aiofm．ac．cn
