title: Rabi-Lorentzian profile of an atomic resonance obtained with Gaussian beams.
abstract: We demonstrate that the interaction between atoms and a Gaussian beam changes the Lorentzian resonance into a so-called Rabi-Lorentzian resonance profile. The existence of such profiles is experimentally evidenced in a dark resonance situation for metastable (4) He, in the absence of any external perturbation. A topological mechanism is shown theoretically to account for the measured profiles. We observe a 3% systematic residual with respect to a pure Lorentzian profile, which could play a role in the search of high precision in the measurement of fundamental constants.
authors.forename: H
authors.initials: H
authors.lastname: Gilles
authors.forename: B
authors.initials: B
authors.lastname: Cheron
authors.forename: O
authors.initials: O
authors.lastname: Emile
authors.forename: F
authors.initials: F
authors.lastname: Bretenaker
authors.forename: A
authors.initials: A
authors.lastname: Le Floch