The focusing effect of cold atomic cloud with a red-detuned Gaussian   beam
  We have demonstrated an atom-optical lens, with the advantage of a small scale and flexible adjustment of the parameters, realized by a far red-detuned Gaussian laser beam perpendicular to the propagation direction of the cold atomic cloud. The one-dimensional transverse focusing effect of cold atomic clouds at the temperature order of 1 $\mu$K freely falling through the atom-optical lens on the micron scale have been studied theoretically and then verified experimentally. It is found that theory and experiment are in good agreement. 
Zhenglu Duan, Shuyu Zhou, Tao Hong, and Yuzhu Wang
quant-ph physics.atom-ph