Stochastic resonance in periodic potentials: Realization in a dissipative optical lattice
Laboratoire Kastler Brossel, Département de Physique de l'Ecole
Normale Supérieure, 24, rue Lhomond, 75231, Paris Cedex 05, France
Accepted: 23 May 2002
We have observed the phenomenon of stochastic resonance on the Brillouin propagation modes of a dissipative optical lattice. Such a mode has been excited by applying a moving potential modulation with phase velocity equal to the velocity of the mode. Its amplitude has been characterized by the center-of-mass (CM) velocity of the atomic cloud. At Brillouin resonance, we studied the CM velocity as a function of the optical pumping rate at a given depth of the potential wells. We have observed a resonant dependence of the CM velocity on the optical pumping rate, corresponding to the noise strength. This corresponds to the experimental observation of stochastic resonance in a periodic potential in the low-damping regime.
PACS: 05.45.-a – Nonlinear dynamics and nonlinear dynamical systems / 42.65.Es – Stimulated Brillouin and Rayleigh scattering / 32.80.Pj – Optical cooling of atoms; trapping
© EDP Sciences, 2002