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Pré-Publication, Document De Travail Année : 2005

Beam quality of a non-ideal atom laser

Résumé

We study the propagation of a non-interacting atom laser distorted by the strong lensing effect of the Bose-Einstein Condensate (BEC) from which it is outcoupled. We observe a transverse structure containing caustics that vary with the density within the residing BEC. Using WKB approximation, Fresnel-Kirchhoff integral formalism and ABCD matrices, we are able to describe analytically the atom laser propagation. This allows us to characterize the quality of the non-ideal atom laser beam by a generalized M$^2$ factor defined in analogy to photon lasers. Finally we measure this quality factor for different lensing effects.
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Dates et versions

hal-00008591 , version 1 (10-09-2005)
hal-00008591 , version 2 (12-09-2005)
hal-00008591 , version 3 (13-09-2005)
hal-00008591 , version 4 (30-11-2005)

Identifiants

Citer

J.-F. Riou, W. Guerin, Y. Le Coq, M. Fauquembergue, Philippe Bouyer, et al.. Beam quality of a non-ideal atom laser. 2005. ⟨hal-00008591v3⟩
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