Propagation in the air of laser radiation with wavelengths in the range from 248 to 1240 nm are investigated numerically. It was shown that the intensity in a filament weakly depends on the wavelength in a long-wave region and decreases significantly in the UV region. Electron concentration in a plasma channel increases with a wavelength decrease with a dependence close to quadratic. With an increase in the wavelength characteristic scale of the intensity variation in the pulse cross section, the radii of the filament and plasma channel increase.
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Fedorov et al. (2008) studied this question.
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