Volume 77, Number 2, January 2007
Article Number 20007
Number of page(s) 5
Section General
Published online 17 January 2007
EPL, 77 (2007) 20007
DOI: 10.1209/0295-5075/77/20007

Test of the isotopic and velocity selectivity of a lithium atom interferometer by magnetic dephasing

M. Jacquey1, A. Miffre1, 2, M. Büchner1, G. Trénec1 and J. Vigué1

1  Laboratoire Collisions Agrégats Réactivité (UMR 5589, CNRS-Université Paul Sabatier Toulouse 3) IRSAMC - 118, Route de Narbonne, 31062 Toulouse Cedex, France
2  LASIM, Université Claude Bernard Lyon I and CNRS UMR 5579 - 10, Rue A. M. Ampère 69622 Villeurbanne Cedex, France

received 26 September 2006; accepted in final form 21 November 2006; published January 2007
published online 17 January 2007

A magnetic field gradient applied to an atom interferometer induces a M-dependent phase shift which results in a series of decays and revivals of the fringe visibility. Using our lithium atom interferometer based on Bragg laser diffraction, we have measured the fringe visibility as a function of the applied gradient. We have thus tested the isotopic selectivity of the interferometer, the velocity selective character of Bragg diffraction for different diffraction orders as well as the effect of optical pumping of the incoming atoms. All these observations are qualitatively understood but a quantitative analysis requires a complete model of the interferometer.

03.75.Dg - Atom and neutron interferometry .
39.20.+q - Atom interferometry techniques .
42.50.Vk - Mechanical effects of light on atoms, molecules, electrons and ions .

© Europhysics Letters Association 2007