About propagation of super-Gaussian electromagnetic pulse in a resonantly absorbing gas medium

Based on the direct calculation (without the introduction of simplifying assumptions and transformations) of the Fourier integral, an analysis was made of the nature and features of the deformation of a nanosecond radio pulse with a super-Gaussian envelope and an energy spectrum belonging to the frequency interval occupied by the spectral line in a resonantly absorbing gaseous medium. The pulse propagates along the nearground path, the resonant absorption is due to the strong spectral line of water vapor with a frequency of 988.2 GHz, and its interaction with the medium is described by the Drude-Lorentz model. It has been established that in the case of a super-Gaussian pulse one should expect a significant change in the nature of distortions in comparison with a Gaussian pulse. In particular, it is shown that, with increasing optical path depth, the super-Gaussian pulse gradually transforms to the form of a set of two subpulses separated along the time axis, while the separation of the Gaussian pulse does not occur, all other conditions being equal.

resonantly absorbing medium, super-Gaussian pulse, envelope deformation