Berlin 2001 – scientific programme
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A: Atomphysik
A 3: Multi Photon Processes
A 3.9: Talk
Monday, April 2, 2001, 17:45–18:00, H1058
Path-integral formalism for intense laser-atom processes — •Dejan Milošević1, Wilhelm Becker2, Richard Kopold2, and Maciej Lewenstein3 — 1Faculty of Science, University of Sarajevo, Zmaja od Bosne 35, 71000 Sarajevo, Bosnia and Herzegovina — 2Max-Born-Institut, Max-Born-Str. 2a, 12489 Berlin, Germany — 3Institute for Theoretical Physics, Universität Hannover, 30167 Hannover, Germany
Using Feynman’s path integral formalism the transition amplitudes of quantum-mechanical processes can be expressed using functional integrals which are difficult to handle. However, for atomic processes in the presence of a strong laser field these probability amplitudes can be expanded in terms of the contributions of quantum orbits which are a generalization of classical electron trajectories. The quantum orbits are complex as a consequence of their origin by tunneling ionization. Typically, only few such orbits give the main contribution to these amplitudes. In this paper, we will show examples concerning high-harmonic generation and above-threshold ionization. In particular, we consider elliptically polarized and bichromatic laser fields, as well as the presence of an additional strong static electric field.
We gratefully acknowledge support by the VolkswagenStiftung.