Damping rates of the atomic velocity in Sisyphus cooling
Laurent Sanchez-Palencia, Michele Schiavoni, Francois-Regis Carminati, Ferruccio Renzoni, Gilbert Grynberg
Abstract
We present a theoretical and experimental study of the damping process of the atomic velocity in Sisyphus cooling. The relaxation rates of the atomic kinetic temperature are determined for a 3D lin optical lattice. We find that the damping rates of the atomic temperature depend linearly on the optical pumping rate, for a given depth of the potential wells. This is at variance with the behavior of the friction coefficient as calculated from the spatial diffusion coefficients within a model of Brownian motion. The origin of this different behavior is identified by distinguishing the role of the trapped and traveling atoms.
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