Compression of a cold atomic cloud by on-resonance laser light

Lev Khaykovich, Nir Davidson

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


We analyze the light-induced atom-atom interactions in optically thick atomic clouds and show that, when the laser frequency is on-resonance with the atomic transition, they become attractive. On the basis of this analysis we propose and demonstrate a novel scheme to compress a cold and dense atomic cloud with a short onresonance laser pulse. The compression force arises from attenuation of the laser light by the atomic cloud. The following free propagation of the atoms shows a lenslike behavior that yields a transient density increase at the focal time, where neither laser nor magnetic field perturbations exist. A cooling pulse, which is applied at the focal time of this lens, restores the initial temperature of atoms, and hence the phase space density is increased. Finally, we adopt our compression scheme to a quasi-steady-state mode by temporally chopping it with the cooling and trapping beams of a magnet-optical trap.

Original languageEnglish
Pages (from-to)702-709
Number of pages8
JournalJournal of the Optical Society of America B: Optical Physics
Issue number5
StatePublished - May 1999
Externally publishedYes


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