Broadband laser cooling of trapped atoms with ultrafast pulses
  We demonstrate broadband laser cooling of atomic ions in an rf trap using ultrafast pulses from a modelocked laser. The temperature of a single ion is measured by observing the size of a time-averaged image of the ion in the known harmonic trap potential. While the lowest observed temperature was only about 1 K, this method efficiently cools very hot atoms and can sufficiently localize trapped atoms to produce near diffraction-limited atomic images. 
B.B. Blinov, R.N. Kohn Jr., M.J. Madsen, P. Maunz, D.L. Moehring, C.   Monroe