Influence of molecular absorption of the ground atmospheric path on characteristics of the filamentation range of high-power CO2-laser radiation
Yu.E. Geynts, A.A. Zemlyanov
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
Keywords: ultra-short laser radiation, self-focusing, filamentation, ionization, laser plasma
Abstract
The theoretical aspects of self-focusing and filamentation of high-power pulsed CO2-laser radiation with the carrier wavelength 10.6 mm in air are considered. The frequency-differential molecular absorption of atmospheric air is included in the theoretical model. It is shown that in the conditions of pulse self-phase modulation, the super-broad pulse spectrum is strongly affected by atmospheric absorption that destabilizes the filamentation process and leads to the considerable reducing of the plasma channel length formed in the beam wake.
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