Accelerating evaporative cooling of atoms into Bose-Einstein condensation in optical traps

Chen Lung Hung, Xibo Zhang, Nathan Gemelke, Cheng Chin

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Abstract

We demonstrate a simple scheme to achieve fast, accelerating (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 ∼ 105 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.

Original languageEnglish (US)
Article number011604
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume78
Issue number1
DOIs
StatePublished - Jul 24 2008

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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