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Chinese Physics Letters

Phase Dependence of Fluorescence Spectrum of a Two-Level Atom in a Trichromatic Field

李景艳, 胡响明, 李晓霞, 石文星, 徐清, 郭洪菊

Published Jan 1, 2005• 0 citations
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Abstract

我们在由一块三色的调制的地驾驶的 atwo 水平原子的回声荧光检验阶段依赖者效果。荧光光谱在各自的阶段上与中央部件相比，不是简单地关键地取决于边带部件的相对阶段的和，这被显示出。中央山峰的外观和边带山峰的选择消除被改变和阶段简单地完成。一旦和阶段被修理，光谱不管各自的相对阶段使它的特征未改变。

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我们在由一块三色的调制的地驾驶的 atwo 水平原子的回声荧光检验阶段依赖者效果。荧光光谱在各自的阶段上与中央部件相比，不是简单地关键地取决于边带部件的相对阶段的和，这被显示出。中央山峰的外观和边带山峰的选择消除被改变和阶段简单地完成。一旦和阶段被修理，光谱不管各自的相对阶段使它的特征未改变。
We examine the phase-dependent effects in resonance fluorescence of a two-level atom driven by a trichromatic modulated field. It is shown that the fluorescence spectrum depends crucially on the sum of relative phases of the sideband components compared to the central component, not simply on the respective phases. The appearance or disappearance of the central peak and the selective elimination of the sideband peaks are achieved simply by varying the sum phase. Once the sum phase is fixed, the spectrum keeps its features unchanged regardless of the respective relative phases.
We investigate the quantum noise in phase quadratures of resonance fluorescence from a two-level atom driven by a trichromatic exciting field. It is shown that the noise spectra are crucially dependent on the sum of relative phases of the sideband components compared to the central component although the sideband exciting components are much weaker than the central component. When we tune the exciting sidebands on two-photon resonance with the Mollow sideband transitions and set the phase sum to $\ensuremath{\pi}$, sideband squeezing in the in-phase quadrature remains almost the same as in the monochromatic case. Once the phase sum is set to zero, the squeezing is destroyed. The responsible mechanism is explained in terms of two-photon emission processes induced by the trichromatic components and the interference between these processes.