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Physical Review A

Observation of doubly dressed states in cold atoms

Min Yan, Edward G. Rickey, Yifu Zhu

Published Jun 8, 2001• 96 citations
Publisher

Abstract

We report an experimental observation of doubly dressed states in ${}^{87}\mathrm{Rb}$ atoms cooled and confined in a magneto-optical trap. The doubly dressed states are produced by a strong-coupling laser and a moderate pump laser in a three-level atomic configuration. The absorption spectrum of a weak probe laser reveals a three-peaked spectral profile that can be interpreted by a dressed-state picture and agrees well with calculations based on the density-matrix equations.

DOI
10.1103/physreva.64.013412

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We investigate systematically pump-probe spectroscopy of cold 87Rb{}^{87}\mathrm{Rb}87Rb atoms produced by a magneto-optical trap. The pump-probe spectra are measured without the presence of the trapping beams or any optical molasses. Various polarization configurations of the probe and pump fields result in very different spectra of probe absorption. The observed spectra exhibit a dispersive profile, a dispersionlike profile, a Lorentzian profile, or a dispersive profile plus a Lorentzian profile. The widths of all the spectral profiles are narrower than the natural linewidth of the excited state. Our work clarifies the mechanisms behind these different spectral profiles and provides essential information for the pump-probe spectroscopy of cold atoms.
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