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- Title
Model description of intense ultra-short laser pulse filamentation: multiple foci and diffraction rays.
- Authors
Geints, Y. E.; Bulygin, A. D.; Zemlyanov, A. A.
- Abstract
We present a new outlook on the problem of ultrashort laser pulse self-focusing and filamentation when propagating in air. Two previously known qualitative physical models of optical pulse filamentation scenario, the dynamic multiple focusing, and the wave-guiding models, are considered and partially revisited. In terms of the averaged (effective) laser beam radius, the filament is treated as a net product of layer-by-layer (in time) self-focusing of separate temporal pulse slices. By means of the developed time-averaged diffraction ray tracking technique, the crucial role of the diffraction effects in the formation of a light filament and next following a low-divergent light channel near the beam axis is revealed.
- Subjects
ULTRASHORT laser pulses; LASER beam diffraction; MATHEMATICAL models; FEMTOSECOND lasers; OPTICAL diffraction; ELECTROMAGNETIC pulses; PULSE generators
- Publication
Applied Physics B: Lasers & Optics, 2012, Vol 107, Issue 1, p243
- ISSN
0946-2171
- Publication type
Article
- DOI
10.1007/s00340-011-4765-z