Measurement of the coherence of a bose-einstein condensate

E. W. Hagley, L. Deng, M. Kozuma, M. Trippenbach, Y. B. Band, M. Edwards, M. Doery, P. S. Julienne, K. Helmerson, S. L. Rolston, W. D. Phillips

Research output: Contribution to journalArticlepeer-review

171 Scopus citations


We present experimental and theoretical studies of the coherence properties of a Bose-Einstein condensate (BEC) using an interference technique. Two optical standing wave pulses of duration 100 ns and separation Δt are applied to a condensate. Each standing wave phase grating makes small copies of the condensate displaced in momentum space. The quantum mechanical amplitudes of each copy interfere, depending on Δt and on spatial phase variations across the condensate. We find that the behavior of a trapped BEC is consistent with a uniform spatial phase. A released BEC, however, exhibits large phase variation across the condensate. 1999

Original languageEnglish
Pages (from-to)3112-3115
Number of pages4
JournalPhysical Review Letters
Issue number15
StatePublished - 1 Jan 1999

ASJC Scopus subject areas

  • Physics and Astronomy (all)


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