缓冲气体对循环流动铯蒸汽激光器气体温度分布和输出特性的影响

为研究缓冲气体对循环流动半导体泵浦碱金属蒸汽激光器（DPAL）气体温度三维分布和输出性能的影响，将光束传播方程引入循环流动DPAL理论模型，仿真分析了高功率泵浦情况下缓冲气体配比和压强对端面泵浦横向流动铯蒸汽激光器（Cs-DPAL）输出性能的影响，获得了蒸汽池内工作气体温度的三维分布和对应的输出功率。结果表明，使用纯烷烃作为缓冲气体时，相比于CH₄，相同压强的C₂H₆对应的蒸汽池内温度更低，激光输出功率更高；使用烷烃气体和惰性气体的混合物作为缓冲气体时，若烷烃的压强较低，加入适量的He或Ar可降低蒸汽池内温度并提升激光输出功率。

Effect of buffer gas on gas temperature distribution and output characteristics of flowing-gas circulation cesium vapor laser

To study the effect of buffer gas on the three-dimensional gas temperature distribution and output performance of flowing-gas circulation diode-pumped alkali vapor laser (DPAL), the beam propagation equation is introduced into the theoretical model of flowing-gas circulation DPAL in this paper. The effects of the composition and pressure of the buffer gas on the output performance of the end-pumped transverse flow cesium vapor laser are simulated and analyzed. The three-dimensional distribution of work temperature and output power are obtained. The results show that when using pure alkanes as buffer gas, the temperature in the vapor cell corresponding to ethane is lower than methane with same pressure, and the laser output power is higher. When the mixture of alkane gas and inert gas is used as a buffer gas, if the pressure of alkane is low, adding an appropriate amount of He or Ar can reduce the temperature in the vapor cell and increase the laser output power.