摘要 : We demonstrate runaway evaporative cooling directly with a tightly confining optical-dipole trap andachieve fast production of condensates of 1.5 X 105 87Rb atoms. Our scheme uses a misaligned crossed-beamfar off-resonance optical... 展开 We demonstrate runaway evaporative cooling directly with a tightly confining optical-dipole trap andachieve fast production of condensates of 1.5 X 105 87Rb atoms. Our scheme uses a misaligned crossed-beamfar off-resonance optical-dipole trap (MACRO-FORT). It is characterized by independent control of the trapconfinement and depth allowing forced all-optical evaporation in the runaway regime. Although our configu-ration is particularly well suited to the case of 87Rb atoms in a 1565 nm optical trap, where an efficient initialloading is possible, our scheme is general and will allow all-optical evaporative cooling at constant stiffness forevery optically trappable atomic or even molecular species. 收起