Europhys. Lett.
Volume 61, Number 2, January 2003
Page(s) 187 - 193
Section Atomic and molecular physics
Published online 01 January 2003
DOI: 10.1209/epl/i2003-00211-3
Europhys. Lett., 61 (2) , pp. 187-193 (2003)

Continuous loading of a non-dissipative atom trap

C. F. Roos, P. Cren, D. Guéry-Odelin and J. Dalibard

Laboratoire Kastler Brossel - 24 rue Lhomond, F-75231 Paris Cedex 05, France

(Received 3 July 2002; accepted in final form 4 November 2002)

We study theoretically a scheme in which particles from an incident beam are trapped in a potential well when colliding with particles already present in the well. The balance between the arrival of new particles and the evaporation of particles from the trapped cloud leads to a steady state that we characterize in terms of particle number and temperature. This scheme is particularly interesting for a cigar-shaped potential where different longitudinal and transverse evaporation thresholds can be chosen. We show that a resonance occurs when the transverse evaporation threshold coincides with the energy of the incident particles. It leads to a dramatic increase in phase space density with respect to the incident beam.

32.80.Pj - Optical cooling of atoms; trapping.
05.20.Dd - Kinetic theory.
03.75.Fi - Phase coherent atomic ensembles; quantum condensation phenomena.

© EDP Sciences 2003