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Phys Rev Lett. 2001 Jul 2;87(1):010404. Epub 2001 Jun 19.

All-optical formation of an atomic Bose-Einstein condensate.

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School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332-0430, USA.


We have created a Bose-Einstein condensate (BEC) of 87Rb atoms directly in an optical trap. We employ a quasielectrostatic dipole force trap formed by two crossed CO2 laser beams. Loading directly from a sub-Doppler laser-cooled cloud of atoms results in initial phase space densities of approximately 1/200. Evaporatively cooling through the BEC transition is achieved by lowering the power in the trapping beams over approximately 2 s. The resulting condensates are F = 1 spinors with 3.5x10(4) atoms distributed between the m(F) = (-1,0,1) states.

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