Evaporative cooling of a small number of atoms in a single-beam microscopic dipole trap

Abstract

We demonstrate experimentally the evaporative cooling of a few hundred rubidium 87 atoms in a single-beam microscopic dipole trap. Starting from 800 atoms at a temperature of 125microKelvins, we produce an unpolarized sample of 40 atoms at 110nK, within 3s. The phase-space density at the end of the evaporation reaches unity, close to quantum degeneracy. The gain in phase-space density after evaporation is 10^3. We find that the scaling laws used for much larger numbers of atoms are still valid despite the small number of atoms involved in the evaporative cooling process. We also compare our results to a simple kinetic model describing the evaporation process and find good agreement with the data.

7 pages, 5 figures

References in corpus (9)

• Storage and control of optical photons using Rydberg polaritons
• Cooling a single atom in an optical tweezer to its quantum ground state
• Fast, Runaway Evaporative Cooling to Bose-Einstein Condensation in Optical Traps
• Diffraction limited optics for single atom manipulation
• Optimized production of large Bose Einstein Condensates
• All-optical generation and photoassociative probing of sodium Bose-Einstein condensates
• Bose-Einstein Condensation in a CO_2-laser Optical Dipole Trap
• All-optical formation of a Bose-Einstein condensate for applications in scanning electron microscopy
• Measurement of the atom number distribution in an optical tweezer using single photon counting

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