Damping rates of the atomic velocity in Sisyphus cooling
Laurent Sanchez-Palencia, Michele Schiavoni, F.-R. Carminati, Ferruccio Renzoni, G. Grynberg · Journal of the Optical Society of America B · 2003
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 three-dimensional lin⊥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.