Loading cold atoms into a time averaged optical dipole trap

We describe our investigations of optical dipole traps for neutral atoms using a high power CO$_2$ laser beams (FORT). Studies of these quasi-electrostatic traps lead us to the creation of a Bose-Einstein condensate (BEC) by all optical means. We have developed a new technique to increase the optical trap population, improving spatial and phase space densities of the atomic cloud. This enhances the evaporative cooling efficiency to realize a BEC. This technique is based on a fast sweeping of the CO$_2$ beam while loading the atoms from a Magneto optical trap. We have found that the FORT population (N$_{FORT})$, being proportional to the FORT volume, also saturates once a certain potential depth is reached. The goal would be to engineer the sweeping amplitude and frequency to increase the effective volume and keep the potential depth at its saturation limit. A considerable increase in the N$_{FORT }$is observed for a proper choice of the amplitude and frequency of the sweeping. A detailed study of these time averaged optical traps will be presented.