Mixture of ultracold lithium and cesium atoms in an optical dipole trap

Abstract

We present the first simultaneous trapping of two different ultracold atomic species in a conservative trap. Lithium and cesium atoms are stored in an optical dipole trap formed by the focus of a CO${}_2$ laser. Techniques for loading both species of atoms are discussed and observations of elastic and inelastic collisions between the two species are presented. A model for sympathetic cooling of two species with strongly different mass in the presence of slow evaporation is developed. From the observed Cs-induced evaporation of Li atoms we estimate a cross section for cold elastic Li-Cs collisions.

10 pages 9 figures, submitted to Appl. Phys. B; v2: Corrected evaporation formulas and some postscript problems

References in corpus (1)

• Mixture of ultracold lithium and cesium atoms in an optical dipole trap

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