准分子宽带泵浦碱金属激光器输出特性的理论研究

发布时间：2018-05-28 09:12

本文选题：准分子宽带泵浦碱金属激光器 + 泵浦阈值　；参考：《北京邮电大学》2015年硕士论文

【摘要】：文章根据已有的研究模型,改进了以Cs-Ar混合气体为增益介质的五能级准分子宽带泵浦碱金属激光器(XPAL)的速率方程模型,通过模拟计算得到了不同温度和弛豫气体浓度下输出激光能量随输入泵浦能量变化的曲线图,模型得到的斜率效率和实验数据基本符合。结果表明,其他条件不变的情况下,温度越高,XPAL的阈值和斜率效率会越高；弛豫气体浓度足够大的时候,852nm的D2线没有激光输出；在一般条件下,XPAL在T=515K附近时效率最高。文章还研究了含有双光子吸收机制的碱金属蒸汽激光器的特性,建立了以Rb蒸汽为激光工作物质的四能级速率方程模型,模拟结果得出含有双光子吸收机制的碱金属蒸汽激光器效率较高,但激光泵浦阈值也较高,效率和阈值随工作温度的升高而升高。
[Abstract]:In this paper, the rate equation model of a five-level excimer wideband pumped alkali metal laser with Cs-Ar mixture as gain medium is improved according to the existing research models. The curves of the output laser energy varying with the input pump energy at different temperature and relaxation gas concentration are obtained by simulation. The slope efficiency obtained by the model is in good agreement with the experimental data. The results show that the higher the temperature, the higher the threshold value and slope efficiency of XPAL, the higher the relaxation gas concentration is, the higher the threshold and slope efficiency will be, and when the concentration of relaxation gas is high enough, the D2 line at 852 nm will have no laser output, and the efficiency of XPAL will be the highest at T515K under general conditions. The characteristics of alkali metal vapor laser with two-photon absorption mechanism are also studied, and a four-level rate equation model with RB vapor as working material is established. The simulation results show that the alkali metal vapor laser with two-photon absorption mechanism is more efficient, but the laser pump threshold is also higher, and the efficiency and threshold value increase with the increase of operating temperature.
【学位授予单位】：北京邮电大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN248

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