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Spatio-temporal beam propagation. Beam propagation was simulated in the spatially chirped dimension, x, generated by Fourier pulse propagation using the non-paraxial propagator. We begin from (a) the lens at z = 0 and proceed in (b)-(e) to the focal plane at z = f. Note that the spatial scale has changed between (c) and (d) by a factor of 10. Above each spatio-temporal plot is a lineout at x = 0 with a corresponding temporal axis.
