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Formation of asymmetric optical transmission spectra of a nanosecond discharge in extended shielded tubes upon resonant interaction of short laser pulses with excited neon atoms

The results of an experimental study of the processes of resonant interaction of short pulses of polychromatic radiation of a dye laser with plasma of a nanosecond discharge in neon in an extended cylindrical shielded discharge tube are presented. The formation of asymmetric optical dispersion-type transmission spectra of plasma with light amplification at the shortwavelength or long-wavelength wing of NeI absorption spectral line with a wavelength of 650.6 nm is discovered. The conditions under which the amplification of light on the short-wavelength wing of the spectral line is replaced by the amplification of light on the long-wavelength wing of the given spectral line are experimentally determined. For the investigated design of the discharge chamber, a numerical simulation of the dynamics of the space-time distribution of the density of absorbing atoms in the process of nanosecond electrical breakdown of neon was carried out in the Comsol Multiphysics software package. The mechanisms of a possible connection between the character of the longitudinal spatial inhomogeneities of absorbing atoms and the asymmetry of the profile of the plasma transmission spectrum in the area of anomalous dispersion are discussed.