Stuttgart 2012 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 1: Interaction with strong or short laser pulses I
A 1.1: Hauptvortrag
Montag, 12. März 2012, 10:30–11:00, V55.01
Atoms and ions in intense ultrashort laser pulses: entering the relativistic regime — •Alejandro Saenz — Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin
The experimental availability of ultrashort laser pulses with extreme peak intensities above 1020W cm−2 opens an mostly unexplored field of laser-matter interaction. At these intensities the influence of the magnetic field cannot longer be ignored. This demands a treatment beyond the usual non-relativistic description within the dipole approximation. A further reason for abandoning the dipole approximation is that short wavelengths are often adopted which requires to consider the spatial variation of the electric (and magnetic) fields within the laser pulse. Most importantly, the outer electrons of atoms or molecules are blown away already during the rising edge of the laser pulse, long before the peak intensity is reached. Therefore, one has to deal with deeply bound core electrons. They may be produced in the same laser pulse or separately by, e. g., using an EBIT. The description of the deeply bound electrons requires a fully relativistic treatment. Therefore, the proper theoretical description of atomic systems at those extreme intensities requires to solve the time-dependent Dirac equation (TDDE) in which the coupling with the field is fully taken into account beyond the dipole approximation. We have recently developed such a solver for (effective) one-electron systems in full dimensions and first results, including a newly found scaling law, will be presented.