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.
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Geints, Y.E., Bulygin, A.D. & Zemlyanov, A.A. Model description of intense ultra-short laser pulse filamentation: multiple foci and diffraction rays. Appl. Phys. B 107, 243–255 (2012). https://doi.org/10.1007/s00340-011-4765-z
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DOI: https://doi.org/10.1007/s00340-011-4765-z