Nonlinear electromagnetic X waves

Phys Rev Lett. 2003 May 2;90(17):170406. doi: 10.1103/PhysRevLett.90.170406. Epub 2003 May 2.

Abstract

Nonlinear optical media that are normally dispersive support a new type of localized (nondiffractive and nondispersive) wave packets that are X shaped in space and time and have slower than exponential decay. High-intensity X waves, unlike linear ones, can be formed spontaneously through a trigger mechanism of conical emission, thus playing an important role in experiments.