Fast, Runaway Evaporative Cooling to Bose-Einstein Condensation in Optical Traps

Abstract

We demonstrate a simple scheme to achieve fast, runaway evaporative cooling of optically trapped atoms by tilting the optical potential with a magnetic field gradient. Runaway evaporation is possible in this trap geometry due to the weak dependence of vibration frequencies on trap depth, which preserves atomic density during the evaporation process. Using this scheme, we show that Bose-Einstein condensation with ~10^5 cesium atoms can be realized in 2~4 s of forced evaporation. The evaporation speed and energetics are consistent with the three-dimensional evaporation picture, despite the fact that atoms can only leave the trap in the direction of tilt.

References in corpus (6)

• Spin domains in ground state spinor Bose-Einstein condensates
• Evidence for Efimov quantum states in an ultracold gas of cesium atoms
• Creation of ultracold molecules from a Fermi gas of atoms
• All Optical Formation of an Atomic Bose-Einstein Condensate
• All-Optical Production of a Degenerate Fermi Gas
• Optimized production of a cesium Bose-Einstein condensate

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