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Chinese Physics Letters

Phase Control of Spontaneous Emission of a Three-Level Atom in Two Bichromatic Fields

Xiaoxia Li, Xiangming Hu, Shi Wen-Xing, Qing Yang Xu, Hongju Guo, LI Jing-yan

Published Jan 30, 2006• 10 citations
Publisher

Abstract

We use the relative phase difference of two bichromatic fields of equal frequency differences for the coherent control of spontaneous emission of a three-level atom in the Λ configuration. Effects such as selective and total cancellation of fluorescence decay are obtained simply by varying the phase difference. The phase dependence of fluorescence spectra is attributed to the fact that the four different field components induce the transitions in a closed loop configuration.

DOI
10.1088/0256-307x/23/2/018

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We use the relative phase difference of two bichromatic fields of equal frequency differences for the coherent control of spontaneous emission of a three-level atom in the Λ configuration. Effects such as selective and total cancellation of fluorescence decay are obtained simply by varying the phase difference. The phase dependence of fluorescence spectra is attributed to the fact that the four different field components induce the transitions in a closed loop configuration.
The interference spectra arising from the competition between a spontaneous process and an induced one by two laser fields, which interact on two-photon resonance with a three-level atom in the Lambda configuration have been considered. In the low intensity limit of both laser fields, the frequency profiles of the two peaks, which arise from the spontaneous and induced processes, respectively, cancel each other out completely at the centre of the line for zero detuning and at the finite values of the detuning as well. At those frequencies, the fluorescent light totally disappears. The interference spectra arising from the absorption of a laser photon by the ground state of the atom consists of two peaks describing the induced processes of absorption and stimulated emission, respectively.
We investigate theoretically the features of the spontaneous emission spectrum of a four-level atomic system driven by a coherent probe field,a coupling laser field and a microwave field.The two upper levels are coupled by a microwave field with lower frequency.The time evolution of the populations is calculated.It is shown that the spectra behavior,such as spectral-line narrowing,spectral-line enhancement,spectral-line suppression,and total cancellation of fluorescence quenching,can be easily controlled by changing the phase and the amplitude of the microwave field.
The spontaneous emission property of a five-level atom with a loop structure driven by three optical fields and a microwave field is intensively studied. Several quantum interference effects can be observed in the spontaneous emission spectra, such as spectral-line narrowing, spectral-line enhancement, spectral-line suppression, partial cancellation and fluorescence quenching. The number of emission peaks, the positions of dark lines can be controlled by varying the intensities of driving fields or the phase of the microwave field coupling the two lower levels in the atomic system. Furthermore, since no rigorous conditions are required, the expected phenomena may easily be achieved experimentally in atomic systems.
We investigate the spontaneous emission spectrum of a three-level atom coherently driven by a microwave field. The microwave excitation establishes a coherent link between the bottom two levels, and as a consequence induces the quantum interference of previously independent decay pathways. As the decay pathways differ from one another by an odd number of stimulated emission processes, the spontaneous emission spectrum acquires a dependence on the phase of the excitation field, a feature that is absent in other resonance fluorescence phenomena.
We discuss quantum interference effects in the resonance fluorescence spectrum of a \ensuremath{\Lambda} three-level atom when the lower-level doublet is driven by a coherent field. The interfering pathways that lead to the same final state involve both spontaneous decays and stimulated transitions, and differ from one another by an odd number of stimulated processes induced by the driving field. As a consequence, the interference structures depend upon the phase of the coherent field, an effect that is absent in other resonance fluorescence phenomena. The phase dependence of the quantum interference contribution is especially significant when the level splitting of the driven doublet is comparable to the spontaneous decay rates of the competing optical paths.