Modified " delta -kick cooling" using magnetic field gradients

  • Myrskog S
  • Fox J
  • Moon H
 et al. 
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We present an improved and simplified version of “δ-kick cooling.” By application of a pulsed magnetic field, laser-cooled Rb atoms are cooled in one dimension, by a factor of 10 below the temperature of optical molasses. While phase-space density is conserved in this process, the method is more efficient than adiabatic expansion. We have achieved temperatures below 700 nK, but there is no fundamental limit to this cooling technique. The technique can also be used as an atom lens and as a spin-dependent probe. We show preliminary results suggesting interesting spin-temperature correlations within an optical molasses.

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  • S. H. Myrskog

  • J. K. Fox

  • H. S. Moon

  • J. B. Kim

  • A. M. Steinberg

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