Numerical investigation of propagation of radiation pulse at xxx

The propagation of a radiation pulse at lambda = 10.6 microns absorbing medium was investigated. The influence of saturation and nonlinear processes of oscillatory energy exchange on the self stress of light beams with Gaussian profile was studied. A theoretical model was derived and illustrated. The analysis indicates that allowance must be made for the excitations of various types of oscillations of the molecules of the mixture and the finite thermalization rate of the absorbed energy, as well as saturation of the absorbing transition, for a radiation pulse propagating in gaseous resonant absorbing media. Failure to take these effects into account can result in substantial errors in determining the amplitude phase characteristics of the light beam.