Abstract
Theoretical aspects of self-focusing and filamentation in air of high-power pulsed CO2 laser radiation with a carrier wavelength of 10.6 μm are considered. The frequency-differential molecular absorption of atmospheric air is included in a theoretical model. The super-broad pulse spectrum is shown to be strongly affected by atmospheric absorption that destabilizes the filamentation process and considerably reduces the length of a plasma channel formed in a beam channel under the conditions of pulse self-phase modulation.
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