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Journal of Modern Optics

Decaying-dressed-state analysis of a coherently driven three-level Λ system

Petr M. Anisimov, Olga A. Kocharovskaya

Published Nov 10, 2008• 65 citations
Publisher

Abstract

We introduce decaying-dressed states for a three-level Λ system driven at one atomic transition and probed at the adjacent one. These states allow for a simple interpretation and classification of various coherent effects in such a system.
DOI
10.1080/09500340802302378

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Electromagnetically induced transparency (EIT) resonance in a $\ensuremath{\Lambda}$ configuration is obtained when the frequencies of two fields are close to resonance with two of the transitions and their frequency difference matches the frequency of the third transition. In this situation the spectrum of one swept field as a probe gives a simple transparency feature. However, when an additional field drives the third transition the EIT feature associated with the probe is split. This perturbed EIT is illustrated for both single and bichromatic driving fields. In the single-driving-field case a density matrix treatment is shown to be in reasonable agreement with experiment, and in both single and bichromatic cases the structure in the spectrum can be explained using the dressed-state formalism. The dressed states can also be used to account for subharmonic resonances observed in the strong-probe regime.