Berlin 2001 – wissenschaftliches Programm
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A: Atomphysik
A 5: Posters Tuesday (Photoionisation, Multi Photon Processes)
A 5.38: Poster
Dienstag, 3. April 2001, 12:30–15:00, AT3
Photon emission by ions interacting with short intense laser pulses — •Niels Kylstra1, Robert Potvliege1,2, and Charles Joachain2,3 — 1Department of Physics, University of Durham, Durham DH1 3LE, UK — 2Physique Théorique CP227, Université Libre de Bruxelles, B-1050 Brussels, Belgium — 3Max-Planck-Institut für Quantenoptik, Garching, Germany
Photon emission by light hydrogen-like ions interacting with intense, few-cycle Ti:Sapphire laser pulses is calculated within the strong-field approximation of Lewenstein and co-workers, modified so as to treat the coupling of the atom with the incident field beyond the dipole approximation. The approach is tested by comparing with results obtained by numerically solving the time-dependent Schrödinger equation for a two-dimensional model ion. The effect of the magnetic field component of the driving pulse is significant beyond 2 × 1017 W cm−2 peak intensity. It leads, in particular, to a saturation in photon emission with increasing laser intensity. As compared to emission polarized along the same direction as the incident field, emission polarized along its propagation direction is weaker by about two orders of magnitude at the maximum peak intensity considered, 3.6 × 1017 W cm−2.