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对LD端面泵浦分离型激光放大介质的热效应进行了分析和研究;建立了Cr,Yb:YAG/Yb:YAG复合结构的热传导模型。采用有限元分析方法得到了介质内部的温度分布,给出了介质折射率随温度变化的计算方法并得到了出射端面波前相位分布随温度变化的情况。计算结果表明:保持泵浦光功率密度不变,在不同的泵浦时长下,介质温度以及通光方向截面折射率变化也不同。随着泵浦时间的增长,介质的温度和折射率也增大,出射端面激光光束的相位畸变同样增大。当泵浦光功率密度增大时,温度与折射率的变化趋势与泵浦时间变化时的情况较为相似。热效应随着泵浦时间的增长和泵浦光功率的增大都变得越来越严重。
The thermal effect of LD end-pumped laser amplification media was analyzed and studied. The heat conduction model of Cr, Yb: YAG / Yb: YAG composite structures was established. The temperature distribution inside the medium was obtained by the finite element analysis method. The calculation method of the refractive index of the medium with temperature was given and the wavefront phase distribution of the outgoing end surface was changed with the temperature. The calculation results show that the change of the refractive index of the cross-section of the medium temperature and the light passing direction is different under different pump durations while keeping the power density of the pump light constant. As pump time increases, the temperature and refractive index of the medium also increase, and the phase distortion of the exit laser beam also increases. When the power density of pump light increases, the trend of temperature and refractive index is similar to the change of pump time. The thermal effect becomes more and more serious as the pump time increases and the pump power increases.