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Plasma Generation Movie :::
For a pulse of longer duration, multiphoton
absorption can produce free electrons, and the avalanche effect will
then produce a plasma whose density can become significant. The plasma
can then absorb and defocus the collapsing beam. This animation shows
how the light field intensity (blue) as a function of transverse
coordinate and time evolves as the light propagates over a distance of
about 1.5 centimeters. The pink field represents the plasma density.
Once the light intensity is sufficiently high, the plasma density
increases leading to a "hole" in the light field.
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