Resonant fluorescence spectra of a multilevel system in intense radiation and external magnetic fields

Theory and methods of computer simulations permit investigation of the interaction of high-power laser radiation, up to GW/cm^2, with atoms having both small and large finestructure intervals compared with interactions with a laser field and an external magnetic field. The modifications of the energies and population of atomic levels due to such interactions lead to nonlinear effects. Besides modifications in the Raman effect and new effects of rotation of the plane of polarization and circular dichroism that were investigated earlier, there are such nonlinear effects as the modification of the number, positions, intensities, and polarizations of the lines in the resonant fluorescence spectrum. Numerical experiments permit investigation of the characteristics of resonant fluorescence and comparison with known experimental results.