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Relativistische Rekollisionen in starken Laserfeldern


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

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Klaiber, M. (2007). Relativistische Rekollisionen in starken Laserfeldern. PhD Thesis, Ruprecht-Karls Universität, Heidelberg.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-7BAC-3
The relativistic ionization-recollision process is investigated theoretically. In order to treat the problem analytically a gauge-invariant version of the strong-field approximation is developed and employed to describe above-threshold ionization (ATI) as well as highharmonic generation (HHG). Relativistic calculations of the corresponding energy spectra show a strong suppression of the recollision of the ionized electron with the atomic core in conventional laser fields compared to the nonrelativistic approach. Three different proposals based on a modification of the driving laser via the use of attosecond laser pulse trains are presented that circumvent this problem and allow the recollision of the ionized electron in the relativistic regime. In this way coherent radiation with energies up to 10 MeV and zeptosecond -ray pulses via the HHG-process become feasible.