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为了解决半导体激光器侧面泵浦Nd:GdVO_4板条激光器热透镜效应问题,用解析分析的方法研究Nd:GdVO_4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:GdVO_4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:GdVO_4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Nd~(3+)浓度1.2atm.%的Nd:GdVO_4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 problem of thermal lens effect of the side-pumped Nd: GdVO_4 laser diode lasers, the temperature rise and thermal deformation of the Nd: GdVO_4 lamellar side-pump were studied by analytical method. Based on the analysis of the pump light intensity and the lasing structure of laser lasers and their working conditions, a thermal analysis model of the side-pump lath was established. According to the thermal power distribution characteristics in the side-pumping lath, a new anisotropy By solving the heat conduction equation, the general analytical expressions of the temperature field and the thermal deformation field of Nd: GdVO_4 slab are obtained. The effects of different pumping spots on the thermal effects of Nd: GdVO_4 laths were quantitatively analyzed. The results show that when Nd: GdVO_4 Nd: (3+) concentration 1.2atm.% Is used as the pump side diode pump with output power of 80W, the maximum temperature rise of the pump surface is 695.2 ℃. The maximum thermal deformation of the end face were 1.38μm and 0.63μm, respectively. The results provide theoretical guidance for reducing the influence of thermal lens effect and improving the gain efficiency of intracavity laser.