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Resonance fluorescence of a trapped three-level atom
Bienert, Marc (Universität Ulm. Abteilung Quantenphysik)
Merkel, Wolfgang (Universität Ulm. Abteilung Quantenphysik)
Morigi, Giovanna (Universität Ulm. Abteilung Quantenphysik)

Data: 2004
Descripció: 12 pàg.
Resum: We investigate theoretically the spectrum of resonance fluorescence of a harmonically trapped atom, whose internal transitions are Λ shaped and driven at two-photon resonance by a pair of lasers, which cool the center-of-mass motion. For this configuration, photons are scattered only due to the mechanical effects of the quantum interaction between light and atom. We study the spectrum of emission in the final stage of laser cooling, when the atomic center-of-mass dynamics is quantum mechanical and the size of the wave packet is much smaller than the laser wavelength (Lamb-Dicke limit). We use the spectral decomposition of the Liouville operator of the master equation for the atomic density matrix and apply second-order perturbation theory. We find that the spectrum of resonance fluorescence is composed of two narrow sidebands—the Stokes and anti-Stokes components of the scattered light—while all other signals are in general orders of magnitude smaller. For very low temperatures, however, the Mollow-type inelastic component of the spectrum becomes visible. This exhibits novel features which allow further insight into the quantum dynamics of the system. We provide a physical model that interprets our results and discuss how one can recover temperature and cooling rate of the atom from the spectrum. The behavior of the considered system is compared with the resonance fluorescence of a trapped atom whose internal transition consists of two levels.
Drets: Tots els drets reservats.
Llengua: Anglès
Document: article ; recerca ; publishedVersion
Publicat a: Physical review. A, Vol. 69, Issue 1 (January 2004) , p. 013405, ISSN 1050-2947

DOI: 10.1103/PhysRevA.69.013405

12 p, 198.3 KB

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