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Journal of Modern Optics

Emission spectrum of a Λ-type three-level atom driven by the squeezed coherent field and grey-body radiation field

Guo Hong, PENG JIN-SHENG

Published Jun 1, 2001• 14 citations
Publisher

Abstract

By means of quantum electrodynamics, an analytical expression of emission spectrum for a Λ-type three-level atom with the two non-degenerate lower levels in the cavity is given. The character of the emission spectrum for the input in pure number state, a squeezed coherent state and grey-body state are exhibited. The effects of the atomic initial state, the field property, the cavity absorptivity and the system temperature on the time-dependent physical spectrum are analysed.

DOI
10.1080/09500340108231768

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By means of quantum electrodynamics, an analytical expression of emission spectrum for a Λ-type three-level atom with the two non-degenerate lower levels in the cavity is given. The character of the emission spectrum for the input in pure number state, a squeezed coherent state and grey-body state are exhibited. The effects of the atomic initial state, the field property, the cavity absorptivity and the system temperature on the time-dependent physical spectrum are analysed.
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By means of time-evolution operator,the emission spectrum of a Λ-type three-level atom interacting resonantly with two-mode thermal radiation cavity fields was studied.The physical spectrum expression of radiation emitted by the atom was given.The structure of the emission spectrum for a thermal input was discussed.The results indicate that whether two lower levels are degeneracy or not,Rabi splitting occurred in the emission spectra of Λ-type three-level atom when the average photon number of two-mode thermal radiation cavity fields is very small.And the structure of the resonant emission spectra of the atomic system has ten peaks generally.
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The treatment of a Λ-type three-level atom interacting with a single mode field in a cavity, explicitly taking the existence of forms of nonlinearities of both the field and the intensity-dependent atom-field coupling into account. Analytical expressions of the emission and absorption spectra are presented using the dressed states of the system. The characteristics of the emission and absorption spectra for binomial state and squeezedcoherent state inputs are exhibited. The effects of the mean number of photons, the detuning, and the nonlinearities on the spectra are investigated. It is shown that the features of the fluorescence and absorption spectra are influenced significantly by the kinds of nonlinearities.
The process of a Λ-type three-level atom interacting with the field in an ideal cavity was investigated.By solving the eigen equation,the cavity field spectrum expression of the system was given out.Some numerical results were presented.When the initial field is in a vacuum state,two-peak structure appears for the two degenerate lower levels,and six- or four-peak structure appears for the two non-degenerate ones.The probability amplitudes and relative phase play a decisive role in the spectrum structure when the atom is in a coherent superposition of the two lower levels initially.