Time-dependent spectra of a strongly driven three-level atom

Abstract

Time-dependent features of the fluorescence radiation from a strongly driven three-level atom in a Raman configuration are studied applying the Eberly-Wodkiewicz counting-rate definition of the spectrum. Using our earlier formalism, where we assume that one or both of the driving fields are intense, we obtain analytical expressions for the time-dependent fluorescence spectra. We have also studied the influence on the transient spectrum of the initial preparation of the atom in three different dressed states.

Degenerate cascade fluorescence: Optical spectral-line narrowing via a single microwave cavity*

“…To study cavity effects, we select a structure representative of a fluorescence spectrum in free space, because the spectrum generally has a fairly complicated dependence on the dressing fields. [38][39][40][41] While the strong dressing fields define the entire spectral structure, the weak cavity field affects the widths and heights of the spectral lines. For a three-level atom, as shown in Fig.…”

“…Fluorescence is emitted from a triplet to an adjacent lower-lying triplet. [38][39][40][41][42] Degenerate cascade fluorescence appears when the three dressed states are equally spaced from each other. A single microwave cavity that resonates with the cascade-dressed transitions is sufficient to make each dressed state enter the cavity-feedback dynamic, which gives rise to the narrowing of spectral lines from optical transitions.…”

Time-dependent spectra of a three-level atom in the presence of electron shelving

“…In this model, the source field is scanned by a nonzero bandwidth filter prior to photodetection, handling properly the time-energy uncertainty that arises when both time and frequency are to be resolved. The EW spectrum has been applied to study nontrivial dynamics of optical systems, for example: the effects of switching-on [15] and switching-off the laser [16], initial atomic coherence [17], and coherent population trapping [18] in resonance fluorescence; spontaneous emission (the first prediction of the Rabi doublet) [19], Dicke superradiance [20] and frequency-filtered photon correlations [21] in cavity QED. The EW spectrum has also been applied to the spontaneous emission in front of a moving mirror [22,23] and two-atom entanglement [24] in QED.…”