为了解决半导体激光器侧面泵浦Nd:GdVO₄板条激光器热透镜效应问题,用解析分析的方法研究Nd:GdVO₄板条侧泵时产生的温升以及热形变分布情况。通过半导体激光器出射泵浦光光强、激光板条镀膜结构以及工作状态的分析,建立了侧泵板条热分析模型,依据侧泵板条内热功率分布特点,推导出一种新的各向异性热传导方程求解方法,得到了侧泵Nd:GdVO₄板条温度场以及热形变场的一般解析计算表达式。并就不同泵浦光斑对Nd:GdVO₄板条热效应的影响进行了定量分析。结果表明:当使用输出功率为80W的半导体激光器侧泵掺Nd3+浓度1.2atm.%的Nd:GdVO₄晶体时,泵浦面的最高温升为695.2 ℃,泵浦面与通光端面的最大热形变量分别为1.38μm和0.63μm。研究结果对于减小板条激光器热透镜效应影响、提高腔内振荡光的增益效率具有理论指导作用。

In order to solve the thermal lens effects of Nd:GdVO₄ slab side-pumped by diode bar,the distributions of temperature rise and thermal distortion on Nd:GdVO₄ slab were analytical investigated. Through analyzing the intensity of pump light emitted by diode bar,film structure and working-state of laser slab,a thermal mode of slab side-pumped by diode bar was established. Based on the interior thermal power distributions of slab,a new solution of anisotropic thermal conduction equation was deduced,and the general analytical expressions of temperature field and thermal distortion field within Nd:GdVO₄ slab were obtained. Meanwhile,the influences of the different pump spots on thermal effects of Nd:GdVO₄ slab were quantitatively analyzed. The results show that when the output power of diode bar is 80 Watt,the pump-face of 1.2atm.% concentration neodymium-doped Nd:GdVO₄ slab can get a maximum temperature rise of 695.2 ℃,and the maximum thermal distortions of the pumped-face and the end-face are 1.38μm and 0.63μm respectively. The research results will play theoretically instructive effects at reducing thermal lens effects of slab laser and improving gain-efficiency of intra-cavity oscillating laser.