ausblenden:
Schlagwörter:
ELECTROMAGNETICALLY INDUCED TRANSPARENCY; INDUCED TRANSITIONS;
RARE-GASES; STATES; SPECTROSCOPY; FEMTOSECOND; ULTRAVIOLET; RADIATION;
SHAPES; OPTICSPhysics;
Zusammenfassung:
We review the theoretical investigations of the autoionzing wave packet excited by an isolated attosecond pulse and dressed by a time-delayed intense laser pulse. The few-level model is described and the applications in photoemission and photoabsorption are given. For the three-level, resonantly coupled system, the main features are explained by the Rabi oscillation modulated in the dressing field. For such a system, by precisely controlling the intensity and the time delay of the dressing pulse, we show the shaping of the attosecond pulse when propagating in a gas medium. A more sophisticated multi-level system with coupling terms involving continuum states is also developed, in which the importance of the continuum-continuum coupling is evaluated with the help of an ab initio calculation.
