Runaway evaporation for optically dressed atoms

Details Runaway evaporation for optically dressed atoms Runaway evaporation for optically dressed atoms

2010-11-19

arxiv.org/abs/1011.4372v1

Journal of Physics B: Atomic, Molecular and Optical Physics 43, 20 (2010) 205306

Physics

Atomic Physics

Scientific paper

10.1088/0953-4075/43/20/205306

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.

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