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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。
Based on the heat conduction equation and the Gauss-Seidel numerical method, the thermal effects of partial pumping slab lasers such as temperature distribution, thermal stress and thermal refractive index change were analyzed in detail and compared with unilateral pumping and bilateral pumping A The results show that a partially pumped slab laser with reasonable design can obtain higher pumping efficiency and its thermal effect is not significantly degraded compared to the case of uniform pumping. Both the serrated laser and the straight-line laser The beam quality factor is 1.4. If the zigzag propagation mode is adopted, the beam quality factor can be increased to 1.1.