Abstract
Self-focusing has been investigated only in the limit in which the beam diameter is significantly less than the pulse length (CT, where T is the pulse duration). In this case, the beam would self-focus to moving singularities in the absence of other nonlinear effects. However, there is an opposite extreme in which the beam diameter is much larger than the pulse length and the pulse disperses before any self-focusing can occur. Short-pulse self-focusing is more related to the second extreme than to the first.
© 1991 Optical Society of America
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