Optimizing the efficiency of evaporative cooling in optical dipole traps

Abraham J. Olson, Robert J. Niffenegger, and Yong P. Chen
Phys. Rev. A 87, 053613 – Published 20 May 2013

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 87Rb with 2×104 atoms starting from only 5×105 atoms initially loaded in the optical dipole trap, achieving an evaporation efficiency γeff of 4.0 during evaporation.

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  • Received 15 November 2012

DOI:https://doi.org/10.1103/PhysRevA.87.053613

©2013 American Physical Society

Authors & Affiliations

Abraham J. Olson*, Robert J. Niffenegger, and Yong P. Chen

  • Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA

  • *olsonaj@purdue.edu
  • yongchen@purdue.edu

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Issue

Vol. 87, Iss. 5 — May 2013

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