Conical emission, pulse splitting, and X-wave parametric amplification in nonlinear dynamics of ultrashort light pulses.
The precise observation of the angle-frequency spectrum of light filaments in water reveals a scenario incompatible with current models of conical emission (CE). Its description in terms of linear X-wave modes leads us to understand filamentation dynamics requiring a phase- and group-matched, Kerr-driven four-wave-mixing process that involves two highly localized pumps and two X waves. CE and temporal splitting arise naturally as two manifestations of this process.
Faccio
Daniele
D
CNR-INFM, Department of Physics and Mathematics, University of Insubria, Como, Italy. daniele.faccio@unisubria.it
Porras
Miguel A
MA
Dubietis
Audrius
A
Bragheri
Francesca
F
Couairon
Arnaud
A
Di Trapani
Paolo
P