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Pulse Splitting Movie :::
Critical collapse due to self focussing can
be halted by normal group velocity dispersion (GVD). Even a very small
GVD will become important because the peak (in time) of anoptical pulse
will collapse after propagating shorter distance than the parts of the
pulse just before and after, leading to extremely sharp curvature in
the field, which leads to a strong influence from the GVD. The GVD
arrests the collapse and splits the pulse in to two less intense pieces
which are below threshold for collapse. These smaller pulses diffract
(spread).
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