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Science 4 May 2001:
Vol. 292. no. 5518, pp. 902 - 905
DOI: 10.1126/science.108836
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Reports

Feynman's Path-Integral Approach for Intense-Laser-Atom Interactions

P. Salières,1 B. Carré,1 L. Le Déroff,1 F. Grasbon,2 G. G. Paulus,2 H. Walther,2 R. Kopold,3 W. Becker,3 D. B. Milosevic,4 A. Sanpera,5 M. Lewenstein5*

Atoms interacting with intense laser fields can emit electrons and photons of very high energies. An intuitive and quantitative explanation of these highly nonlinear processes can be found in terms of a generalization of classical Newtonian particle trajectories, the so-called quantum orbits. Very few quantum orbits are necessary to reproduce the experimental results. These orbits are clearly identified, thus opening the way for an efficient control as well as previously unknown applications of these processes.

1 Centre d'Etudes de Saclay, CEA/DRECAM/SPAM, 91191 Gif-sur-Yvette, France.
2 Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany.
3 Max-Born-Institut, 12489 Berlin, Germany.
4 Faculty of Science, University of Sarajevo, 71000 Sarajevo, Bosnia and Hercegovina.
5 Institute for Theoretical Physics, Universität Hannover, 30167 Hannover, Germany.
*   To whom correspondence should be addressed. E-mail: lewen{at}itp.uni-hannover.de

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