Optical resonance shifts in the fluorescence of thermal and cold atomic gases

Abstract

We show that the resonance shifts in the fluorescence of a cold gas of rubidium atoms substantially differ from those of thermal atomic ensembles that obey the standard continuous medium electrodynamics. The analysis is based on large-scale microscopic numerical simulations and experimental measurements of the resonance shifts in a steady-state response in light propagation.

To appear in Phys. Rev. Lett

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