Atom-laser coherence length and atomic standing waves

Year: 2000

Authors: Carusotto I., Artoni M., La Rocca G.C.

Autors Affiliation: Scuola Normale Super Pisa, INFM, I-56126 Pisa, Italy; INFM, European Lab Nonlinear Spect, I-50125 Florence, Italy; Univ Salerno, Dipartimento Fis, I-84081 Baronissi, SA, Italy.

Abstract: We consider the dynamical Bragg reflection of an atomic matter wave from a finite optical lattice; the resulting energy dependence of the transmittivity allows us to filter out the velocities of the incident atoms. In particular, we show how the coherence length of the incident beam can be inferred from the sharpness of the transmittivity as a function of the lattice intensity. For incident frequencies well inside the reflecting window, the interference of incident and reflected matter waves gives rise to an oscillatory density profile in front of the lattice which can be observed by means of light diffraction. The angular width of the diffracted peaks also provides information on the coherence length of the incident atomic beam.

Journal/Review: PHYSICAL REVIEW A

Volume: 62 (6)      Pages from: 63606-1  to: 63606-5

KeyWords: Bose-einstein Condensation; Dynamical Diffraction; Spatial Coherence; Output; Gas; Lattice
DOI: 10.1103/PhysRevA.62.063606

Citations: 6
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