Lensing and Waveguiding of Ultraslow Pulses in an Atomic Bose-Einstein   Condensate
  We investigate lensing and waveguiding properties of an atomic Bose-Einstein condensate for ultraslow pulse generated by electromagnetically induced transparency method. We show that a significant time delay can be controllably introduced between the lensed and guided components of the ultraslow pulse. In addition, we present how the number of guided modes supported by the condensate and the focal length can be controlled by the trap parameters or temperature. 
Devrim Tarhan, Alphan Sennaroglu, Ozgur E. Mustecaplioglu
physics.optics quant-ph