Creation of a Bose-condensed gas of rubidium 87 by laser cooling

Abstract

We demonstrate direct laser cooling of a gas of rubidium 87 atoms to quantum degeneracy. The method does not involve evaporative cooling, is fast, and induces little atom loss. The atoms are trapped in a two-dimensional optical lattice that enables cycles of cloud compression to increase the density, followed by degenerate Raman sideband cooling to decrease the temperature. Light-induced loss at high atomic density is substantially reduced by using far red detuned optical pumping light. Starting with 2000 atoms, we prepare 1400 atoms in 300 ms at quantum degeneracy, as confirmed by the appearance of a bimodal velocity distribution as the system crosses over from a classical gas to a Bose-condensed, interacting one-dimensional gas with a macroscopic population of the quantum ground state. The method should be broadly applicable to many bosonic and fermionic species, and to systems where evaporative cooling is not possible.

arXiv comment5 pages, 3 figures (main text)

References in corpus (11)

• A quantum gas microscope - detecting single atoms in a Hubbard regime optical lattice
• Single-Atom Resolved Fluorescence Imaging of an Atomic Mott Insulator
• Realization of Bose-Einstein condensates in lower dimensions
• Regimes of quantum degeneracy in trapped 1D gases
• Stationary states of a rotating Bose-Einstein condensate: routes to vortex nucleation
• Resolved-sideband Raman cooling to the ground state of an optical lattice
• Three-body decay of a rubidium Bose-Einstein condensate
• Laser cooling to quantum degeneracy
• Three-body correlation functions and recombination rates for bosons in three and one dimensions
• Weakly interacting Bose gas in the one-dimensional limit
• Thermalization in a quasi-1D ultracold bosonic gas

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