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We confine ^85Rb atoms in an optical dipole force trap with a very large detuning from resonance of up to 65 nm. Confinement times of 200 ms, limited only by background-gas collisions, are obtained without additional cooling. A typical trap contains 1300 atoms at a temperature of 0. 4 mK and a peak density of 810^11 cm^-3. We measure spontaneous photon scatter rates of the trapped atoms to be less than 1. 610^3 s^-1, corresponding to recoil heating rates below 0. 6 mK/s. The far-detuned trap confines atoms with a strong, nearly conservative optical force and negligible atomic excitation.
Miller et al. (Tue,) studied this question.