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在全面分析碱金属蒸气激光放大器的激光动力学与流体动力学过程的基础上,结合热效应、饱和放大效应、放大自发辐射、高能级激发与电离的影响,建立了一个相对完善的物理模型来模拟流动散热条件下半导体抽运碱金属蒸气激光放大器的输出特性。计算模拟了纵向和横向两种不同流动方式下,气体流速对输出功率的影响,比较分析了高抽运功率密度下各能级粒子数密度的变化趋势,最后模拟了各级放大器的功率分配比对提高级联放大器输出效率的作用。结果表明:在相同工作温度条件下,多个等长蒸气池和均等抽运光功率分配能让高级数放大器获得比低级数放大器更高的放大倍数。所提模型有助于高功率碱金属蒸气激光放大器的参量选择和优化设计。
Based on a comprehensive analysis of the laser dynamics and hydrodynamics processes of the alkali metal vapor laser amplifier, a relatively perfect physical model was established to simulate the effect of thermal effects, saturation amplification, amplification spontaneous emission, high-level excitation and ionization Output Characteristics of Semiconductor Pumping of an Alkaline Metal Vapor Laser Amplifier under Flow Cooling Conditions. The effects of gas flow rate on output power under two different flow regimes of longitudinal and transverse flow were simulated and the trend of population density of various levels at high pumping power density was analyzed. Finally, the power distribution ratio To improve cascade amplifier output efficiency. The results show that at the same operating temperature, multiple equal-length vapor pools and equal pumping light power distribution can make higher-order amplifiers obtain higher magnification than lower-order ones. The proposed model contributes to the parameter selection and optimization of high-power alkali-metal vapor laser amplifiers.