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Bulletin of the Russian Academy of Sciences Physics

Polarization spectrum of three-level atoms in weak polychromatic fields

A. G. Antipov, N. I. Matveeva, S. A. Pulkin, Svetlana Uvarova, Вера Ивановна Яковлева

Published Dec 1, 2017• 1 citation
Publisher

Abstract

Differential density matrix equations for a three-level atomic system driven by polychromatic fields are solved numerically. The polarization spectrum of the probe field is obtained. Ultra-narrow resonances in the polarization spectrum on the probe field frequency emerge at multiple harmonics and subharmonics.
DOI
10.3103/s1062873817120048

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An analytic expression of the polarization induced by a polychromatic weak probe field in a two-level medium, driven by a strong polychromatic pumping field, is obtained. This expression allows one to obtain both the absorption and dispersion spectra at any frequency of a probe field. The numerically calculated graphs of the central-component probe-field absorption and dispersion spectra, depending on the pumping-field amplitude in the cases of the one-, two- three-, four-, and five-component pumping field, are presented. It is shown that when the probe-field detuning is close to the strong-field Rabi frequency, the absorption spectrum changes to the dispersionlike form, while the dispersion spectrum changes to the absorptionlike one.