Abstract
We present a qualitative description of the laser-pulse filamentation phenomenon based on light field representation as a self-consistent ensemble of specific localized wave structures known as the diffraction-ray (light) tubes. These light tubes are energetically independent from each other and, at the same time, they are in close field interaction through the phase front of the light wave. The trajectories of light tube centroids represent the evolutionary line of the Poynting vector transverse component. Light tubes do not intersect in space although they can be nested, and the tubes do not exchange light energy with each other. Spatial shape and area of light tubes can vary during pulse propagation, reflecting the influence of different physical processes manifesting themselves upon radiation propagation in a medium. This diffraction-ray approach applies the attributes of the amplitude and phase analysis to the problem of laser radiation self-action and sheds light on the onset and termination conditions of laser-pulse filamentation.
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