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为研究半导体激光抽运碱金属蒸气激光器(DPAL)中抽运光和激光光束匹配对光-光转换效率和斜率效率的影响,在三能级速率方程模型的基础上,用介质内抽运光光强空间分布代替以往简化模型中所用的介质内平均光强,建立了考虑抽运光和激光光强的轴向分布的一维DPAL计算模型和考虑抽运光和激光光强的轴向分布及抽运光在介质中聚焦引起的光强和光斑半径的分布的三维DPAL计算模型。一维模型的计算结果表明,抽运阈值较简化模型结果减小,斜率效率变化不大。三维模型计算结果表明,当抽运光全部在激光的模体积内,斜率效率最大,因此在DPAL实际运转中,优化抽运光的焦参数和激光腔参数,可以提高抽运光的转换效率。
In order to study the effect of pumping light and laser beam matching on the light-to-light conversion efficiency and slope efficiency in a semiconductor laser pumped alkali metal vapor laser (DPAL), based on the three-level rate equation model, The spatial distribution of light intensity instead of the average light intensity in the medium used in the simplified model, a one-dimensional DPAL calculation model considering the axial distribution of pumping light and laser light intensity and an axial distribution considering the pumping light and laser light intensity And three-dimensional DPAL calculation model of the distribution of light intensity and spot radius caused by the focusing of pumping light in the medium. The calculation results of one-dimensional model show that the pumping threshold is smaller than the simplified model, and the slope efficiency does not change much. The results of 3D model show that the slope efficiency is the highest when the pumping light is all in the mode volume of the laser. Therefore, in the DPAL practical operation, optimizing the coke parameter and laser cavity parameters of pumping light can improve the conversion efficiency of pumping light.