Frankfurt 2006 – wissenschaftliches Programm
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A: Atomphysik
A 20: Poster II: Atomare Systeme in starken Laserpulsen und statischen Feldern
A 20.21: Poster
Donnerstag, 16. März 2006, 16:30–18:30, Labsaal
Laser-assisted bremsstrahlung — •Erik Lötstedt, Stephan Schnez, Ulrich D. Jentschura, Karen Z. Hatsagortsyan, and Christoph H. Keitel — Max-Planck-Institut für Kernphysik, Heidelberg
The process of spontaneous bremsstrahlung in a laser field is theoretically studied. We present the fully relativistic differential cross section for spontaneous bremsstrahlung from a relativistic electron scattered by a Coulomb potential in a laser field. The electron-laser interaction is taken into account exactly by treating the laser as an external classical field, while the electron-nucleus interaction and the interaction with the bremsstrahlung radiation are treated in first-order perturbation theory. The full, laser-dressed Green’s function of the Dirac equation is used for the propagator.
Numerical results are obtained for the differential cross section integrated over the solid angle of the final electron, for relativistic electron energies and laser intensities of up to the order 1022 W/cm2 and for both linear and circular polarization of the laser.
We focus in particular on the case when high-harmonic generation is possible, that is, when the bremsstrahlung frequency is an (high) integer multiple of the laser frequency. We show that it is possible to obtain bremsstrahlung spectra showing the features of a plateau and a cutoff.