par Joachain, Charles 
;Kylstra, Niels Jan ;Potvliege, Robert
Référence Journal of modern optics, 50, 3-4, page (313-329)
Publication Publié, 2003-03
;Kylstra, Niels Jan ;Potvliege, Robert Référence Journal of modern optics, 50, 3-4, page (313-329)
Publication Publié, 2003-03
Article révisé par les pairs
| Résumé : | At the high laser intensities currently available, simple descriptions of multiphoton processes based on the non-relativistic Schrödinger equation and the dipole approximation can break down. The paper first discusses how non-dipole effects, of order 1/c, due to the magnetic field component of a laser pulse, influence harmonic generation. Particular attention is devoted to photon emission by positive ions interacting with intense, few-cycle Ti: Sapphire laser pulses. It is found that for peak intensities in excess of 10 17 W cm -2 the magnetic field component of the incident pulse significantly reduces photon emission and modifies the plateau structure of the spectra. It also leads, in certain parts of the spectrum, to the emission of a single attosecond burst of X-ray photons. The influence of non-dipole effects on harmonic generation in the stabilization regime are considered. Finally, the paper reviews recent progress in the theoretical study of relativistic effects arising when atoms interact with ultrastrong laser fields. |
