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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 Lewenstein31Faculty 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.

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