Abraham J. Olson, Robert J. Niffenegger, Yong P. Chen
We present a combined computational and experimental study to optimize the efficiency of evaporative cooling of optically-trapped atoms. We employ a kinetic model of evaporation to determine the optimal relation of trap depth to average trap frequency given experimental initial conditions. We then experimentally implement a highly efficient evaporation process in a misaligned crossed-beam far off-resonance optical dipole trap (MACRO-FORT), showing excellent agreement between the theory and experiment. This method has allowed the creation of Bose-Einstein condensates of $^{87}$Rb with 2$\times 10^4$ atoms starting from only a few $10^5$ atoms initially loaded in the optical trap.
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http://arxiv.org/abs/1211.3469
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