Abstract
Filaments have been the subject of much study in recent years. The general view is that self-focusing occurs in the laser beam until a higher order nonlinearity (usually believed to be multiphoton ionization) becomes significant. A balance then develops between these phenomena such that the beam remains confined to a small diameter over distances that greatly exceed the Rayleigh range. Such filaments have been well examined in the IR but not in the UV.
© 2000 IEEE
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