D. B. Milosevic1 and W. Becker2
1 Faculty of Science, University of Sarajevo, Sarajevo, Bosnia and Herzegovina
2 Max-Born-Institut, Berlin, Germany
Above-threshold ionization is the cleanest laser-atom effect, sinceexperiments observe, in principle, just one atom at any one time in thelaser field. Except very close to the ion, the electron dynamics aredominated by the laser field. This is exploited by the strong-fieldapproximation (SFA), which is largely analytical and complements numericalsolution of the time-dependent Schroedinger equation in the analysis ofthe experimental data. Even though the SFA is an S-matrix theory, in itsquantum-orbit formulation it affords insight into the temporal evolutionof the ionization process. This is particularly illuminating for theinvestigation of few-cycle pulses with fixed carrier-envelope phase.
We review formalism and results of the quantum-orbit SFA, with specialemphasis on few-cycle pulses.
This work was supported in part by VolkswagenStiftung and the FederalMinistry of Education and Science, Bosnia and Herzegovina.
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