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Canadian Journal of Physics

Splitting in the absorption spectrum produced by strong and two-photon resonant fields

Alain Blouin, Marguerite-Marie Denariez

Published Mar 1, 1988• 0 citations
Publisher

Abstract

We demonstrate in the present article that it is possible to observe a two-photon resonance splitting by the use of probe fields coupled to one or both of the degenerate levels.
DOI
10.1139/p88-029

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We have shown that an ultranarrow dark region can be associated with the feature of significant amount of vaccuum-Rabi splitting in the absorption spectrum of a weak coherent field probing a two-level atom strongly coupled to two degenerate cavity-modes with preselected polarizations. The cavity-induced transparency is produced by the decay-interference of the two independent cavity modes interacting with the same reservoir. It has been shown that the resonant probe transparency is independent of the individual decay rates of the cavity modes. The present model exhibits the possibility of obtaining the narrow dark transparency associated with the significant amount of Rabi splitting in the absorption spectrum with the appreciable value of the cavity-losses.
The alteration of atomic absorption via quantum coherence is observed in the degenerate two-level atomic system. It is shown that when the detuning of coupling field equals to that of probe light, i.e. two-photon resonance, the reduction of atomic absorption via electromagnetically induced transparency occurs. However, when we tune the coupling field to two-photon off-resonance, the enhancement of absorption is obtained for the probe field. The influences of one-photon detuning and intensity of coupling field on absorption are also experimentally demonstrated.
We have theoretically and experimentally studied the spectroscopic properties of dressed levels in a strong monochromatic field, and propose a model of cascade splitting of two atomic energy levels. In this model two related dressed levels can be split into four levels, and transitions connecting four new levels will constitute spectroscopic structures. Two types of proof-in-principle experiments are performed to verify the model. One experiment measures the probe absorption spectra of a degenerate two-level atomic system with two strong monochromatic coupling fields. The system consists of 52S1/2,F=2{5}^{2}{S}_{1/2},F=252S1/2​,F=2 and ${5}^{2}{P}_{3/2},{F}^{\ensuremath{'}}=3$ states of 87Rb^{87}\mathrm{Rb}87Rb atoms in a magneto-optical trap (MOT) as well as the cooling beams and an additional coupling field. New spectral features are observed and proven to be due to the transitions of new levels generated by splitting of the dressed levels. The other experiment measures the pump-probe spectra in a degenerate two-level atomic system with one strong monochromatic coupling field. The system consists of 52S1/2,F=2{5}^{2}{S}_{1/2},F=252S1/2​,F=2 and ${5}^{2}{P}_{3/2},{F}^{\ensuremath{'}}=3$ states of the 87Rb^{87}\mathrm{Rb}87Rb atom in a magneto-optical trap and one coupling field. We have observed spectral features that obviously differ from the prediction that comes from the two-level dressed-atom approach. They cannot be explained by existing theories. The model of cascade splitting of two atomic energy levels is employed to explain the observations in these two types of experiments.