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Volume 83, Number 5, September 2008
Article Number 50001
Number of page(s) 6
Section General
Published online 04 August 2008
EPL, 83 (2008) 50001
DOI: 10.1209/0295-5075/83/50001

A quasi-monomode guided atom laser from an all-optical Bose-Einstein condensate

A. Couvert1, M. Jeppesen1, 2, T. Kawalec1, G. Reinaudi1, R. Mathevet3 and D. Guéry-Odelin1, 3

1   Laboratoire Kastler Brossel, CNRS UMR 8852, Ecole Normale Supérieure - 24 rue Lhomond, 75005 Paris, France, EU
2   Australian Centre for Quantum Atom Optics, Physics Department, The Australian National University Canberra, 0200, Australia
3   Laboratoire Collisions Agrégats Réactivité, CNRS UMR 5589, IRSAMC, Université Paul Sabatier 118 Route de Narbonne, 31062 Toulouse CEDEX 4, France, EU

received 7 July 2008; accepted in final form 21 July 2008; published September 2008
published online 4 August 2008

We report the achievement of an optically guided and quasi-monomode atom laser, in all spin projection states (mF = -1, 0 and +1) of F = 1 in rubidium 87. The atom laser source is a Bose-Einstein condensate (BEC) in a crossed dipole trap, purified to any one spin projection state by a spin-distillation process applied during the evaporation to BEC. The atom laser is outcoupled by an inhomogenous magnetic field, applied along the waveguide axis. The mean excitation number in the transverse modes is $\langle n\rangle$ = 0.65 $\pm$ 0.05 for mF = 0 and $\langle n\rangle$ = 0.8 $\pm$ 0.3 for the low-field seeker mF = -1. Using a simple thermodynamical model, we infer from our data the population in each excited mode.

03.75.Pp - Atom lasers.
03.75.Mn - Multicomponent condensates; spinor condensates.
37.10.Gh - Atom traps and guides.

© EPLA 2008