The influence of the inner-shell electron dynamics of an atomic system on its non-linear characteristics in a field of laser radiation is studied theoretically. The quasienergy approach is developed to take into account the correlation interaction. We use the random phase approximation, in which the correlation effects are accounted for by considering the time-dependent interaction potential of a photoelectron with oscillations of the electron density of the inner electrons. In the following calculations the polarisational approximation for this potential was used. Explicit calculations in the case of linear polarisation of the laser field are made for negative ions of halogens and alkaline atoms in the central field approximation both with and without account taken of the inner electron dynamics. The results show that there is substantial suppression of non-linear characteristics when one takes the correlation interaction into account. This is in agreement with the results of several other studies.

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Scattering of optical waves by a multi-scale rough mirror surface as a phase screen is considered. To solve the problem we used the diffusion phase approximation and numerical model of a phase jump. The scattering intensity was averaged over the ensemble of realizations. The results of numerical calculations of the angular dependence of the intensity are presented for a backscattering demonstrating the effect of the roughness distribution over the scales and its secondary impact on the indicatrix of scattering for multiplicative surface modulation.

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