Abstract
Filamentation dynamics in the normal group-velocity-dispersion regime (in condensed media) is interpretable in terms of the spontaneous formation of X waves that is, stationary (non-dispersive and non-diffractive) wave packets characterized by a central high-intensity spike surrounded by slowly decaying tails that continuously sustain the central peak through a refuelling mechanism. X waves also have continuously tuneable phase and group velocities over a broad range of values, so that pulses generated at the same frequency may have very different propagation velocities. The very nature of these wave packets renders them particularly attractive for nonlinear applications that however, have so far been seriously hindered by the difficulty in generating single, high intensity X waves with the desired phase or group velocity.
© 2007 IEEE
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