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Paper detail

Beam quality of a non-ideal atom laser

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.

preprint2005arXivOpen access
J. -F. RiouW. GuerinY. Le CoqM. FauquemberguePhilippe BouyerV. JosseAlain Aspect
physics.atom-phcond-mat.other
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J. -F. RiouW. GuerinY. Le CoqM. FauquemberguePhilippe BouyerV. JosseAlain Aspect

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