摘要
为了解决激光二极管端面泵浦激光棒引起的热效应问题,基于热传导理论,建构了热传导方程新的本征函数解,得出了激光棒内温度场与热形变场的一般解析表达式.该表达式不仅解决了由于棒内热流线径向假设造成的温场计算误差问题,而且解决了使用数值分析方法带来的计算精度不高的问题.研究结果表明,当激光二极管的泵浦功率为20 W、泵浦光斑高斯半径为200μm时,掺钕离子质量分数为0.5%的钒酸钇激光棒泵浦端面具有451.2℃的最高温升和3.42μm的最大热形变量.对激光棒内等温线分布状态分析可以得出,其热流线为非径向分布.与棒内热流线径向假设计算结果对比,激光棒的最高温升值减小了30%.所得结果可以用于激光谐振腔的设计,为减小激光系统的热效应问题提供了理论依据.
In order to solve the thermal effect problem of laser rod by diode laser end-pumped, based on the heat conduct theory, a novel eigenfunction group of heat conduction equation was established and the general solutions of temperature field and thermal distortion field within laser rod were obtained. These analytical solutions not only solve the problem of calculation error in temperature field brought by the approximate assumption of radial heat flow in laser rod, but also overcome the problem of low precision caused by the numerical analysis method. The results show that when the output power of diode laser is 20 W, and the Gaussian spot radius is 200 μm, 0.5% （mass fraction） Nd-ion doped yttrium vanadate laser rod can get a maximum temperature rise of 451.2 ℃ and a maximum thermal distortion of 3.42μm. The distribution of heat flow in laser rod is not radial through analyzing of the isotherm diagram. Compared to the calculation re- sults with the assumption of radial heat flow in laser rod, the maximum temperature rise is reduced by 30%. The results can be applied to the design of resonant cavity and offer theoretical basis for reducing the thermal effect in laser system.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2006年第10期1098-1102,共5页
Journal of Xi'an Jiaotong University
基金
教育部"教育振兴行动计划"资助项目
陕西省教育厅专项科研项目(06JK251)
关键词
激光二极管
端面泵浦
激光棒
温度场
热形变场
diode laser
end-pumped
laser rod
temperature field
thermal distortion field
