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对二极管侧面泵浦的薄片激光器进行了热效应理论模拟和实验研究。针对大尺寸的复合薄片增益介质的热负荷与表面形变进行了有限元理论分析和数值模拟以及实验研究。在不同的泵浦条件下分别进行了波前相位测量,分析了高功率泵浦情况下,大尺寸薄片状激光晶体的形变状况。实验测量结果表明,大尺寸薄片晶体的表面热形变较小,热耗散功率密度降低,与有限元理论模拟分析的结果基本一致,增大激光增益介质的表面尺寸有利于减小热效应。
The theoretical and experimental studies on the thermal effects of diode side-pumped thin-film lasers are carried out. The finite element analysis and numerical simulation of the heat load and surface deformation of large-size composite sheet gain media are carried out. Under different pumping conditions, the wavefront phase measurements were carried out respectively. The deformation of large-size lamellar laser crystals under high power pumping conditions was analyzed. The experimental results show that the surface thermal deformation of the large-size sheet crystal is small and the power dissipation density is reduced, which is basically the same as that of the finite element simulation. Increasing the surface size of the laser gain medium is beneficial to reduce the thermal effect.