Journal
OPTICS LETTERS
Volume 29, Issue 9, Pages 995-997Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.29.000995
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The multiple-collapse dynamics of ultrashort pulses along the propagation direction are investigated under conditions of both normal and anomalous group-velocity dispersion (GVD). In the anomalous-GVD regime we find that collapse events can occur at locations in the medium many diffraction lengths beyond the initial collapse point, in contrast with the normal-GVD regime in which multiple collapse occurs within a diffraction length. Numerical simulations of a modified nonlinear envelope equation are found to be in good qualitative agreement with the observed lengths of the filaments. (C) 2004 Optical Society of America.
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