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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 1/200. Evaporatively cooling through the BEC transition is achieved by lowering the power in the trapping beams over 2s. The resulting condensates are F0ex{0ex}=0ex{0ex}1 spinors with 3. 510^4 atoms distributed between the m₅0ex{0ex}=0ex{0ex} (-1, 0, 1) states.
Barrett et al. (Tue,) studied this question.
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