Bose-Einstein Condensation in a CO_2-laser Optical Dipole Trap

Abstract

We report on the achieving of Bose-Einstein condensation of a dilute atomic gas based on trapping atoms in tightly confining CO_2-laser dipole potentials. Quantum degeneracy of rubidium atoms is reached by direct evaporative cooling in both crossed and single beam trapping geometries. At the heart of these all-optical condensation experiments is the ability to obtain high initial atomic densities in quasistatic dipole traps by laser cooling techniques. Finally, we demonstrate the formation of a condensate in a field insensitive m_F=0 spin projection only. This suppresses fluctuations of the chemical potential from stray magnetic fields.

8 pages, 5 figures

References in corpus (6)

• Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms
• Theory of Bose-Einstein condensation in trapped gases
• Entanglement of atoms via cold controlled collisions
• All Optical Formation of an Atomic Bose-Einstein Condensate
• All-Optical Production of a Degenerate Fermi Gas
• On the nature of spinor Bose-Einstein condensates in rubidium

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• Optimized Bose-Einstein-condensate production in a dipole trap based on a 1070-nm multifrequency laser: Influence of enhanced two-body loss on the evaporation process
• Spatially selective loading of an optical lattice by light-shift engineering using an auxiliary laser field
• Interference of a variable number of coherent atomic sources
• A Bose gas in a single-beam optical dipole trap
• Simulating sympathetic cooling of atomic mixtures in nonlinear traps