Ionization of atoms and ions in high intensity laser field: Electron relativistic rescattering and generation of short-wavelength radiation

Summary form only given. Essential progress has been recently achieved in describing the interaction of atoms with a superstrong laser field. The simple and clear semiclassical picture developed by Corkum provides understanding of the role of quasi-free electron propagation in intense laser fields and shows the fundamental relations underlying basic experimental facts. Moreover, this model is easily generalized for the cases of elliptically polarized radiation and multicolor laser fields that have been recently proposed for the generation and measurement of subfemtosecond laser pulses. We develop a semiclassical approach for describing the evolution of ionized electron in continuum.