Spatiotemporal interaction of optical beams in bi-dispersive media
  The interaction of optical beams in bi-dispersive nonlinear media with self-focusing nonlinearity is numerically investigated. Under proper conditions, the interaction of spatially separated beams can lead to the creation of two prominent filaments along the other spatial or temporal dimension and, thus to an effective beam exchange. This X-wave generation-based effect could potentially be exploited in optical realizations of spatial or spatio-temporal filtering. 
Nikolaos Moshonas, Yannis Kominis, Panagiotis Papagiannis, Kyriakos   Hizanidis and Demetrios N. Christodoulides