''Lambda-enhanced sub-Doppler cooling of lithium atoms in D1 gray molasses''

A.T Grier, I Ferrier-Barbut, B.S Rem, M Delehaye, L. Khaykovich, F Chevy, C Salomon

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Following the bichromatic sub-Doppler cooling scheme on the D1 line of 40K recently demonstrated in  Fernandes et al. [Europhys. Lett. 100, 63001 (2012)], we introduce a similar technique for 7Li atoms and obtain temperatures of 60μK while capturing all of the 5×108 atoms present from the previous stage. We investigate the influence of the detuning between the the two cooling frequencies and observe a threefold decrease of the temperature when the Raman condition is fulfilled. We interpret this effect as arising from extra cooling due to long-lived coherences between hyperfine states. Solving the optical Bloch equations for a simplified Λ-type three-level system we identify the presence of an efficient cooling force near the Raman condition. After transfer into a quadrupole magnetic trap, we measure a phase space density of ∼10−5. This laser cooling offers a promising route for fast evaporation of lithium atoms to quantum degeneracy in optical or magnetic traps.
Original languageAmerican English
JournalPhysical Review A (Atomic, Molecular and Optical Physics)
Issue number6
StatePublished - 2013


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