Optical and evaporative cooling of cesium atoms in the gravito-optical surface trap

Details Optical and evaporative cooling of cesium atoms in the gravito-optical surface trap Optical and evaporative cooling of cesium atoms in the gravito-optical surface trap

2000-05-14

arxiv.org/abs/physics/0005035v1

J. Mod. Opt. 47, 2755 (2000)

Physics

Atomic Physics

8 pages, 6 figures, submitted to Journal of Modern Optics, special issue "Fundamentals of Quantum Optics V", edited by F. Ehlo

Scientific paper

We report on cooling of an atomic cesium gas closely above an evanescent-wave atom mirror. At high densitities, optical cooling based on inelastic reflections is found to be limited by a density-dependent excess temperature and trap loss due to ultracold collisions involving repulsive molecular states. Nevertheless, very good starting conditions for subsequent evaporative cooling are obtained. Our first evaporation experiments show a temperature reduction from 10muK down to 300nK along with a gain in phase-space density of almost two orders of magnitude.

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