Abstract
Recently we reported on a successful achievement of 7Li Bose-Einstein condensate (BEC) by all-optical means [1]. Forced evaporation was performed in a crossed-beam optical trap and BEC was observed on a spontaneously purified |F=1,mF=0≫ spin state. Feshabch resonances were used to tune elastic collision rate. However, inelastic processes such as dipole relaxation and three-body recombination show dramatic enhancement in the vicinity of Feshabch resonances and may limit atom densities and trap lifetime [2]. Indeed, working in between the resonances (866G) we obtained only a few hundreds of atoms in the BEC and its lifetime was extremely short [1].
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