Optimizing the efficiency of evaporative cooling in optical dipole traps
  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. 
Abraham J. Olson, Robert J. Niffenegger, Yong P. Chen
cond-mat.quant-gas physics.atom-ph