Figure 1

Dispersion diagram for a normally dispersive waveguide array: (a) contour plot, (b) three-dimensional depiction, (c) the intensity profile of a discrete $X$-wave structure when the weight functions are Gaussian, (d) the power spectrum for this $X$ wave.Reuse & Permissions

Figure 2

(a) The experimental setup and a schematic view of the sample and the coupling geometry. (b) Experimental measurements of the linear discrete diffraction (top panel) and collapse to the input waveguide at peak power of 730 W (bottom panel). At this power the measurements presented in (c) where taken. (c) High power experimental (solid) and numerical results (dotted) for cross correlations of the pulses emerging from each waveguide, where channel 0 is the input waveguide. The numerical results where convolved with the laser input pulse, to simulate the cross-correlation experiment. (d) The unconvolved output of the simulated array, shown in three-dimensional plot.Reuse & Permissions

Figure 3

(a) Spectrum of the pulse at $z=30\mathrm{mm}$. The signature of the $X$-wave spectrum is clearly seen. (b) Simulated spatiotemporal profile of the pulse at $z=30\mathrm{mm}$ showing the formation of a cascaded $X$ wave under the chosen experimental conditions.Reuse & Permissions