Frankfurt 2006 – wissenschaftliches Programm
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A: Atomphysik
A 20: Poster II: Atomare Systeme in starken Laserpulsen und statischen Feldern
A 20.5: Poster
Donnerstag, 16. März 2006, 16:30–18:30, Labsaal
Impact of a static magnetic field on high harmonic spectra — •R. Fischer1, C. H. Keitel1, R. Jung2, G. Pretzler2, and O. Willi2 — 1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg — 2Institut für Laser- und Plasmaphysik, Heinrich-Heine-Universität Düsseldorf, Universitätsstr. 1, D-40225 Düsseldorf, Germany
As an atom is subjected to a linearly polarized laser field, the magnetic field component of the laser beam is able to cause the electrons to drift in the laser propagation direction. Together with the attraction of the nucleus, this electron motion results in a wiggly motion which gives rise to high harmonic radiation. In our numerical study we solved the time-dependent Schrödinger equation beyond the dipole approximation for a two-dimensional model of an He+ ion subjected to an intense laser beam. We have found that the signal heights of the radiation described above can be affected by a static magnetic field of the order of 30 Tesla which is directed perpendicular to the plane spanned by the laser polarization and propagation direction. The dependence of the signal strength on the external magnetic field suggests a method which might be used to measure strong magnetic fields.