Novel Optical Trap of Atoms with a Doughnut Beam

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書誌事項

公開日
1997-06-23
権利情報
  • http://link.aps.org/licenses/aps-default-license
DOI
  • 10.1103/physrevlett.78.4713
公開者
American Physical Society (APS)

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説明

We have constructed a novel optical trap for neutral atoms by using a Laguerre-Gaussian (doughnut) beam whose frequency is blue detuned to the atomic transition. Laser-cooled rubidium atoms are trapped in the dark core of the doughnut beam with the help of two additional laser beams which limit the atomic motion along the optical axis. About ${10}^{8}$ atoms are initially loaded into the trap, and the lifetime is 150 ms. Because the atoms are confined at a point in a weak radiation field in the absence of any external field, ideal circumstances are provided for precision measurements. The trap opens the way to a simple technique for atom manipulation, including Bose-Einstein condensation of gaseous atoms.

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