Volume 72, Number 3, November 2005
|Page(s)||369 - 375|
|Section||Atomic and molecular physics|
|Published online||23 September 2005|
Time dependence of laser cooling in optical lattices
Department of Physics, Umeå University - SE-901 87 Umeå, Sweden
Corresponding author: firstname.lastname@example.org
Accepted: 6 September 2005
We study the dynamics of the cooling of a gas of caesium atoms in an optical lattice, both experimentally and with 1D full-quantum Monte Carlo simulations. We find that, contrary to the standard interpretation of the Sisyphus model, the cooling process does not work by a continuous decrease of the average kinetic energy of the atoms in the lattice. Instead, we show that the momentum of the atoms follows a bimodal distribution, the atoms being gradually transferred from a hot to a cold mode. We suggest that the cooling mechanism should be depicted in terms of a rate model, describing the transfer between the two modes along with the processes occurring within each mode.
PACS: 32.80.Pj – Optical cooling of atoms; trapping / 05.10.Ln – Monte Carlo methods
© EDP Sciences, 2005
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