Laser cooling to quantum degeneracy

Abstract

We report on Bose-Einstein condensation (BEC) in a gas of strontium atoms, using laser cooling as the only cooling mechanism. The condensate is formed within a sample that is continuously Doppler cooled to below 1\muK on a narrow-linewidth transition. The critical phase-space density for BEC is reached in a central region of the sample, in which atoms are rendered transparent for laser cooling photons. The density in this region is enhanced by an additional dipole trap potential. Thermal equilibrium between the gas in this central region and the surrounding laser cooled part of the cloud is established by elastic collisions. Condensates of up to 10^5 atoms can be repeatedly formed on a timescale of 100ms, with prospects for the generation of a continuous atom laser.

18 pages, 13 figures, 3 tables

References in corpus (6)

• Atom Interferometers
• Bose-Einstein Condensation of Erbium
• Creation of ultracold Sr2 molecules in the electronic ground state
• Production of quantum degenerate strontium gases: Larger, better, faster, colder
• Observing the Formation of Long-range Order during Bose-Einstein Condensation
• Light-shift tomography in an optical-dipole trap for neutral atoms

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