论文标题
在原子CS的基础状态下搜索与圆两极激光探针的对齐定向转换
Searching for alignment-to-orientation conversion in the ground state of atomic Cs with circularly polarized laser probe
论文作者
论文摘要
在这项研究中，我们探讨了观察各种碱金属基态的角动量对齐方式转换（AOC）的可能性：K，RB，CS。对于理论分析，我们使用了一个基于密度矩阵的光学BLOCH方程的模型。我们的模型包括所有相邻的超细级水平与激光辐射的相互作用，在外部磁场中混合磁性子电位，令人兴奋的激光辐射的相干性能以及多普勒效应。此外，我们模拟了地面或激发态相干过程的信号，以确定所获得信号的特征的起源。我们还在具有两个激光梁的CS原子上进行了实验：线性极化的CS $ D_1 $泵和循环极化CS $ D_2 $探针。我们使用泵束在基态下形成角动量对齐，并在改变磁场时观察探针梁的传输信号。提供了从单个圆极化探针激光器组件的实验获得的传输信号的详细分析。最后，讨论了实验观察AOC转换的前景，实验甚至是弱的AOC信号也可能导致系统误差。
In this study we explored the possibilities for observing the angular momentum alignment-to-orientation conversion (AOC) in the ground state of various alkali metals: K, Rb, Cs. For theoretical analysis we used a model that is based on the Optical Bloch equations for the density matrix. Our model includes the interaction of all neighboring hyperfine levels with laser radiation, the mixing of magnetic sublevels in an external magnetic field, the coherence properties of the exciting laser radiation, and the Doppler effect. Additionally we simulated signals where the ground- or the excited-state coherent processes were numerically switched off in order to determine the origins of the features of the obtained signals. We also performed experiments on Cs atoms with two laser beams: a linearly polarized Cs $D_1$ pump and circularly polarized Cs $D_2$ probe. We used the pump beam to create angular momentum alignment in the ground state and observed the transmission signal of the probe beam as we changed the magnetic field. A detailed analysis of the experimentally obtained transmission signal from a single circularly polarized probe laser component is provided. Finally, prospects for observing AOC conversion experimentally are discussed, as well as experiments were even a weak AOC signal could lead to systematic errors.
