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Phys Rev Lett. 2003 May 2;90(17):170406. Epub 2003 May 2.

Nonlinear electromagnetic X waves.

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Istituto Nazionale di Fisica della Materia-RM3, Via della Vasca Navale 84, 00146 Roma, Italy.


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.

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