Study of light-assisted collisions between a few cold atoms in a microscopic dipole trap

Abstract

We study light-assisted collisions in an ensemble containing a small number (~3) of cold Rb87 atoms trapped in a microscopic dipole trap. Using our ability to operate with one atom exactly in the trap, we measure the one-body heating rate associated to a near-resonant laser excitation, and we use this measurement to extract the two-body loss rate associated to light-assisted collisions when a few atoms are present in the trap. Our measurements indicate that the two-body loss rate can reach surprisingly large values beta>10^{-8} cm^{3}.s^{-1} and varies rapidly with the trap depth and the parameters of the excitation light.

6 pages, 7 figures

References in corpus (5)

• Single-Atom Resolved Fluorescence Imaging of an Atomic Mott Insulator
• Energy distribution and cooling of a single atom in an optical tweezer
• Diffraction limited optics for single atom manipulation
• Measurement of the atom number distribution in an optical tweezer using single photon counting
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