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Bremsstrahlung in a Circularly Polarized Laser Field


Schnez,  Stephan
Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;

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Schnez, S. (2006). Bremsstrahlung in a Circularly Polarized Laser Field. Diploma Thesis, University of Heidelberg, Heidelberg.

In this diploma thesis, we evaluate the process of laser-assisted bremsstrahlung. In the usual, well-known bremsstrahlung process, an electron scatters off a Coulomb potential and spontaneously emits a photon. Here, the same process is considered, but in the presence of a strong, circularly polarized laser field. The intensities of the lasers we consider here are in the range of 1019 W/cm2 to 1021 W/cm2 so that a fully relativistic description is necessary. Consequently, we use a quantum-electrodynamical approach. In our formalism, we take the laser field into account by using the solutions of the Dirac equation coupled to an external field { the so-called Volkov solutions. Apart from the theoretical derivation of the laser-dressed bremsstrahlung cross section, the numerical evaluation of the resulting expression with the help of a self-written Fortran 90 programme is an essential part of the thesis at hand. One of the main results is that the cross section shows resonances at { depending on the scattering geometry { integer multiples of the laser frequency. In other words, we have higher harmonic generation in the bremsstrahlung process.