Fluorescence and absorption by a two-level atom in a bichromatic field with one strong and one weak component

Z. Ficek and H. S. Freedhoff
Phys. Rev. A 53, 4275 – Published 1 June 1996
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Abstract

We analyze the fluorescence and absorption spectra of a two-level atom driven by a bichromatic field with frequencies ω1 and ω2, separated by ω2-ω1=2δ, and Rabi frequencies (at resonance) 2Ω1 and 2Ω2 such that their ratio α=Ω2/Ω1<1. We focus on the case of ω1 close to the atomic frequency ω0 and ω2 near the Rabi sideband frequency ω1+2Ω1; the detunings are denoted by Δ1=ω0-ω1 and Δ2=ω1+2Ω1-ω2. We find that the spectra depend critically on the detuning Δ2: For large Δ2, the fluorescence spectrum consists of the well known Mollow triplet, centered at ω1; for smaller (but nonzero) Δ2, the spectrum is composed of a triplet at ω1 together with doublets near the sideband frequencies ω1±2Ω1. However, when Δ2=0 (and α≪1), the spectrum consists of a doublet centered at ω1 and triplets at ω1±2Ω1: there is then no fluorescence at ω1. As α increases, additional triplet structures appear in the spectrum at frequencies ω1±2nΩ1 with intensities proportional to α2(n1), n≳1, and a line reappears at ω1, with intensity proportional to α4. The absorption by the system of a weak probe beam is also strongly dependent on the detuning, and the spectrum is composed of emission-dispersion-absorption features located near ω1 and ω1±2nΩ1. An analysis in the dressed-atom picture is presented which explains the physical origin of all these features, in both fluorescence and absorption. © 1996 The American Physical Society.

  • Received 29 June 1995

DOI:https://doi.org/10.1103/PhysRevA.53.4275

©1996 American Physical Society

Authors & Affiliations

Z. Ficek and H. S. Freedhoff

  • Department of Physics, The University of Queensland, Brisbane, Queensland 4072, Australia
  • Department of Physics, University of Toronto, Toronto, Ontario, Canada M5S 1A7

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Vol. 53, Iss. 6 — June 1996

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