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Coherence properties of an atom laser

M. Trippenbach, Y. B. Band, M. Edwards, M. Doery, P. S. Julienne

cond-matarXiv:cond-mat/9906033

Abstract

We study the coherence properties of an atom laser, which operates by extracting atoms from a gaseous Bose-Einstein condensate via a two-photon Raman process, by analyzing a recent experiment. We obtain good agreement with the experimental data by solving the time-dependent Gross-Pitaevskii equation in three dimensions both numerically and with a Thomas-Fermi model. The coherence length is strongly affected by the space-dependent phase developed by the condensate when the trapping potential is turned off.

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