Three-dimensional angulardistribution of harmonics radiated by an atom interacting with ashort high-frequency super-intense laser pulse

Abstract

Radiation patterns of a three-dimensional hydrogen atominteracting with a high-frequency super-intense laser field arepresented. The laser-atom interaction is modelled without thedipole approximation, i.e. taking into account themagnetic-field component of the laser. Both linearly andcircularly polarized laser fields are considered. The structureof the radiation patterns is analysed. Among the results the appearance of even harmonics with veryhigh relative intensity, due to the magnetic field, in the caseof the linearly polarized field isparticularly relevant.