Movies: Pulses of longer duration have their collapse halted due to Plasma generation.

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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

eye_plasma-an-hlf-12

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.

Main Movie Page / SelfFocus / eye_plasma-an-hlf-12.png
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Movie specs:
1MB
AVI SWF
800x6000
30.000 fps
625.0 kbyte/s