论文标题
多普勒宽的四波混合中的动态鲜明变化
Dynamic Stark shift in a Doppler-broadened four-wave mixing
论文作者
论文摘要
这项工作介绍了在三级级联多普勒宽式系统中产生的四波混合信号中自动镇分裂模式的理论分析。我们采用密度矩阵形式主义来编写Bloch方程并以数值解决。该解决方案使我们能够比较上层群体的响应以及对同质和非均匀扩展系统的产生信号相干性。我们的结果表明，与荧光中观察到的相反，当扫描强或弱梁的频率时，非线性信号发生了AC急剧变化。此外，我们介绍了热rubidium蒸气中四波混合信号的实验数据，以使令人兴奋的光束的共磁配置。 AC Stark位移和信号幅度随激光功率的函数的行为表明模型与实验结果之间有着良好的一致性。
This work presents a theoretical analysis of the Autler-Townes splitting pattern in the four-wave mixing signal generated in a three-level cascade Doppler-broadened system. We employ the density matrix formalism to write the Bloch equations and solve them numerically. The solutions allow us to compare the response of the upper level population and the generated signal coherence for homogeneously and non-homogeneously broadened systems. Our results reveal an AC Stark shift in the nonlinear signal when the frequency of the strong or weak beam is scanned, in contrast to what is observed in the fluorescence. Furthermore, we present experimental data for the four-wave mixing signal in a hot rubidium vapor for the copropagating configuration of the exciting beams. The behavior of the AC Stark displacement and signal amplitude as a function of laser power indicates a good agreement between the model and the experimental results.
