Runaway evaporation for optically dressed atoms
Abstract
Forced evaporative cooling in a far-off-resonance optical dipole trap is proved to be an efficient method to produce fermionic- or bosonic-degenerated gases. However in most of the experiences, the reduction of the potential height occurs with a diminution of the collision elastic rate. Taking advantage of a long-living excited state, like in two-electron atoms, I propose a new scheme, based on an optical knife, where the forced evaporation can be driven independently of the trap confinement. In this context, the runaway regime might be achieved leading to a substantial improvement of the cooling efficiency. The comparison with the different methods for forced evaporation is discussed in the presence or not of three-body recombination losses.
Cite
@article{arxiv.1011.4372,
title = {Runaway evaporation for optically dressed atoms},
author = {David Wilkowski},
journal= {arXiv preprint arXiv:1011.4372},
year = {2010}
}