为了讨论缓冲气体对碱原子精细结构能级间的能量交换加速作用, 利用激光感应荧光光谱对Cs(Rb)-N2系统中的精细结构碰撞能量转移过程进行了实验研究, 获得了不同条件下碱原子D1线和D2线的荧光变化数据。结果表明, 在Cs-N2系统中, N2分子更多参与精细结构能量交换的加速过程;在340K时, 系统具有高的荧光转换效率;在Rb-N2系统中, N2分子主要参与猝灭过程, 对精细结构碰撞的增益作用不明显。这一结果可为半导体抽运碱金属激光器的高效运行提供参考数据。

In order to discuss the acceleration of energy exchange between fine structure energy levels of alkali atoms by buffer gas, the energy transfer process of fine structure collision in Cs(Rb)-N2 system were investigated experimentally by laser induced fluorescence spectroscopy. The fluorescence data of D1 and D2 lines of alkali atoms were obtained under different conditions. The experimental results show that N2 molecules are more involved in the acceleration of fine structure energy exchange in the Cs-N2 system, and the system has a high fluorescence conversion efficiency at 340K. In the Rb-N2 system, N2 molecules mainly participate in the quenching process, and the gain effect on the fine structure collision is not obvious. The results can provide reference data for the efficient operation of the semiconductor pumped alkali laser.