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Opt Lett. 2004 May 1;29(9):995-7.

Role of dispersion in multiple-collapse dynamics.

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  • 1School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, USA.


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.

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