部分抽运的板条激光器的热效应分析

基于热传导方程和高斯赛德尔数值计算方法,对部分抽运板条激光器的温度分布、热应力和热致折射率变化等热效应进行了详细分析,并与单侧抽运及双侧抽运方式进行了比较。结果表明,设计合理的部分抽运板条激光器,可以获得较高的抽运效率,其热效应相比于均匀抽运的情况并没有显著劣化,不论是采用锯齿形传播方式还是直线传播方式的激光器都可以获得较好的光束质量,当一束高斯激光直线经过板条晶体中部时,光束质量因子为1.4,若采用锯齿形传播方式,则光束质量因子可提高到1.1。

Thermal Effects in Partially Laser-Diode-Pumped Slab Lasers

Based on the heat conduction equations and the Gauss-Seidel numerical method,the distribution of temperature,thermal stress and thermally induced refractive index in partially pumped slab lasers are analyzed and comparied with single- and double-side pumped configurations.It is found that a partially pumped slab laser designed appropriately does not suffer more thermal distortion than that in the uniformly pumped ones,meanwhile maintaining high pumping efficiency.Whether the laser works in zigzag or straightforward path,good beam quality is achieved.If Gaussian beam passes the central portion of the crystal in straightforward path,the beam quality factor M~2 is 1.4,while in zigzag path M~2 is improved to 1.1.