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Spontaneously generated X-shaped light bullets
We observe the formation of an intense optical wavepacket fully localized in
all dimensions, i.e. both longitudinally (in time) and in the transverse plane,
with an extension of a few tens of fsec and microns, respectively. Our
measurements show that the self-trapped wave is a X-shaped light bullet
spontaneously generated from a standard laser wavepacket via the nonlinear
material response (i.e., second-harmonic generation), which extend the soliton
concept to a new realm, where the main hump coexists with conical tails which
reflect the symmetry of linear dispersion relationship.Comment: 5 pages, 4 figures, submitted for publicatio