对LD侧边抽运的板条激光介质热效应进行理论分析与数值模拟, 根据2.5 mm×14 mm×40 mm Nd∶YAG板条实物建立了相应的三维(3D)热模型, 采用有限元方法分析并模拟了板条激光介质内部温度场和热应力的分布, 给出在120 W抽运功率下板条激光介质的热畸变特性,估算了在不同抽运功率下热焦距的大小。在此基础上设计并封装了LD侧边抽运的板条激光模块, 对该模块的热焦距进行实验研究, 得到热焦距随抽运功率变化的测量曲线, 实验结果与理论分析一致。

The theoretical and experimental studies on thermal effect of LD edge-pumped slab lasers were carried out. Based on a real edge-pumped slab crystal (2.5 mm×14 mm×40 mm), the three-dimensional (3D) thermal model was built up. Then the temperature distribution and stress pattern of the slab were calculated by finite element analysis. The thermal distortion of slab crystal under 120 W pumping power was obtained, and the thermal focal length for different pumping powers was estimated. The LD edge-pumped slab laser was designed and packaged. The thermal focal length was studied experimentally, and its relationship with pumping power was dicussed. Experimental results agree with theoretical analysis.