Optimizing the efficiency of evaporative cooling in optical dipole traps

Abstract

We present a combined computational and experimental study to optimize the efficiency of evaporative cooling for atoms in optical dipole traps. By employing a kinetic model of evaporation, we provide a strategy for determining the optimal relation between atom temperature, trap depth, and average trap frequency during evaporation given experimental initial conditions. We then experimentally implement a highly efficient evaporation process in an optical dipole trap, showing excellent agreement between the theory and experiment. This method has allowed the creation of pure Bose-Einstein condensates of ${}^{87}$Rb with 2$\times 10^4$ atoms starting from only $5\times 10^5$ atoms initially loaded in the optical dipole trap, achieving an evaporation efficiency, ${\gamma }_{eff}$, of 4.0 during evaporation.

Update and corrections from version 2

References in corpus (2)

• Fast, Runaway Evaporative Cooling to Bose-Einstein Condensation in Optical Traps
• All-Optical BEC in a 1.06 micron dipole trap

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