矩形截面Nd：GGG热容激光器热分析  

Thermal analysis of rectangular Nd:GGG heat capacity lasers

作　　者：史彭[1] 辛宇[1] 李隆[1] 陈文[1] 白冰[1] 

机构地区：[1]西安建筑科技大学理学院,西安710055

出　　处：《激光技术》2011年第3期305-307,333,共4页Laser Technology

基　　金：陕西省教育厅专项科研资助项目(09J1K536);陕西省科技厅工业攻关资助项目(2008K05-15)

摘　　要：为了研究长方体型Nd:GGG热容激光晶体的热效应,通过对激光晶体工作特点的分析,采用半解析各向异性热分析方法,建立了符合实际工作状态热模型,对长方体型Nd:GGG热容激光晶体进行了热分析,得到了激光晶体抽运阶段和冷却阶段晶体内部温度场计算公式,定量分析了晶体宽度和厚度对温度场的影响。结果表明,当使用输出功率为8100W、脉冲频率500Hz、脉冲宽度0.2ms的LD抽运晶体4s时,抽运面中心最高温升为169.1℃;停止抽运120s时,晶体最高温升下降到0.97%。所得结果为热容激光器的优化设计提供了理论依据。In order to study the thermal effect of rectangular Nd： GGG heat capacity laser crystal, the semianalytical analysis of thermal conductive anisotropic material was introduced. Through the analysis of working characteristic of laser crystal, thermal model according to actual working state was established, thermal effect of a rectangular Nd： GGG crystal was investigated and the expressions of temperature field inside laser crystal in the pump stage and cooling stage were obtained. The effect of width and thickness of the crystal on temperature field was analyzed quantitatively. Results show that a maximum temperature rise of 169. I^C is obtained in the center of the pump surface after LD-pumped for 4s with an output power of 8100W and a pulse frequency of 500Hz and a pulse width of 0. 2ms. The maximum temperature rise decreases to 0. 97% 120s later after the pumping stops. The results can offer theoretical basis for the optimization design of heat capacity lasers.

关 键 词：激光物理 热容激光器 端面抽运 长方体Nd:GGG晶体 最高温升 冷却时间 

分 类 号：TN248.1[电子电信—物理电子学]