Abstract

In this paper we present a theoretical framework to identify the role of coherent population oscillation (CPO) in saturated fluorescence spectroscopy in a two-level system which is a very useful spectroscopic technique for weak transitions. The fluorescence dip in a fluorescence spectra is generally explained as a saturation effect. However in this work, we find that the Doppler-free dip in a fluorescence spectra is due to saturation effect and CPO effect. The fluorescence dip is further modified by Doppler averaging and its linewidth and dip height are dependent on the temperature of the atomic gas and the applied laser beam intensity. For an atomic beam, the shift of the fluorescence dip from the line center is dependent on the average velocity of the atomic beam and the misalignment of the laser beams with respect to the atomic beam.

Graphical abstract

中文翻译：

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速度诱导相干种群振荡在饱和荧光光谱中的作用

摘要

在本文中，我们提供了一个理论框架来确定相干种群振荡（CPO）在两级系统中的饱和荧光光谱中的作用，这对于弱跃迁是非常有用的光谱技术。通常将荧光光谱中的荧光下降解释为饱和效应。但是，在这项工作中，我们发现荧光光谱中的无多普勒倾角是由于饱和效应和CPO效应引起的。通过多普勒平均进一步修改了荧光的倾角，其线宽和倾角高度取决于原子气体的温度和所施加的激光束强度。对于原子束，荧光倾角从线中心的偏移取决于原子束的平均速度以及激光束相对于原子束的未对准。

图形概要