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Journal of Experimental and Theoretical Physics

Polarization phenomena in the transparency and adsorption effects induced by the field of counterpropagating waves

Э. Г. Сапрыкин, А. А. Черненко, Anatolii M. Shalagin

Published Aug 1, 2014• 12 citations

Abstract

The physical processes that form the resonances of saturated absorption and magnetic scanning in the field of counterpropagating waves of an arbitrary intensity when their polarizations change are numerically simulated. The atomic transition with level moment J = 1 is used as an example to show that the anomalies in the experimental saturated absorption spectra are determined by the degree of opening of the atomic transition. In the case of magnetic scanning, the anomalies are caused by the magnetic coherence induced by the wave fields at the levels of the lower state rather than by its transfer from the excited states, as was proposed earlier.

DOI: 10.1134/s1063776114070140

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It has been shown analytically and numerically that the effect of magnetic coherence (interference) of levels in L- and V-type transitions, induced by the field of a traveling linearly polarized electromagnetic (EM) wave of arbitrary intensity, can make a significant contribution both to the populations of transition levels (more ~50% than of the field contribution) and to the absorption resonance spectra during frequency and magnetic scanning. Differences in the manifestation of the magnetic coherence effect in level populations for open and closed types of transitions have been identified. It has been established that narrow coherent electromagnetically induced transparency (EIT) resonances are formed in the absorption resonance spectra during magnetic scanning near zero magnetic field. The dependencies of EIT resonance parameters on the characteristics of atomic transitions and EM wave intensity have been investigated. The contribution of the magnetic coherence effect of transition levels to the shape of these resonances has been revealed.

Abstract The physical processes that form the spectra of saturated absorption resonances at atomic transitions between energy levels with angular momenta J = 1/2 and J = 1 in the field of two unidirectional linearly polarised laser waves are studied analytically and numerically. It is shown that the specific features of the resonance spectra are formed in the Λ-schemes of transitions and manifest themselves in the form of narrow coherent structures – dips due to the magnetic coherence (optical orientation) of the transition levels induced by the optical fields. In this case, the energy levels of the lower state make the main contribution, and the contribution of the transfer of magnetic coherence from the sublevels of the upper state to the lower ones in the resonance amplitude manifests itself as an additive. Conditions are found under which the nonlinear resonance is exclusively coherent. The effect of the saturating wave field on the shape of coherent resonance structures is studied.