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.

References in corpus (12)

• Ultracold heteronuclear molecules in a 3D optical lattice
• Degenerate Fermi Gases of Ytterbium
• Three-body recombination at large scattering lengths in an ultracold atomic gas
• Ultracold Heteronuclear Fermi-Fermi Molecules
• Observation of Heteronuclear Feshbach Molecules from a ${}^{85}$Rb - ${}^{87}$Rb gas
• Bose-Einstein condensation of alkaline earth atoms: ${}^{40}${Ca}
• Fast, Runaway Evaporative Cooling to Bose-Einstein Condensation in Optical Traps
• Ultracold atoms confined in rf-induced two-dimensional trapping potentials
• All-Optical Formation of Quantum Degenerate Mixtures
• Bose-Einstein Condensation of an Ytterbium Isotope
• State-dependent, addressable subwavelength lattices with cold atoms
• Trapping and cooling of rf-dressed atoms in a quadrupole magnetic field