Dresden 2011 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 26: Poster III

A 26.38: Poster

Donnerstag, 17. März 2011, 16:00–18:30, P2

Non-linear Compton scattering of ultrashort intense laser pulses — •Daniel Seipt and Burkhard Kämpfer — Institut für Strahlenphysik, Forschungszentrum Dresden Rossendorf, Bautzner Landstraße 400, 01328 Dresden

The Compton scattering of ultrashort intense laser pulses off relativistic electrons is discussed within a framework based on Volkov states. This approach within relativistic quantum electrodynamics fully takes into account the time dependent laser envelope. An expression for the cross section is provided which is independent of the considered pulse shape and pulse length. The ponderomotive broadening of the harmonic peaks, which was predicted within classical calculations of Thomson scattering is confirmed in the Thomson limit of our general quantum result with strong deviations in the high-energy Compton regime. We present a scaling law connecting the first with the latter one, which allows to easily account for recoil effects in classical radiation spectra. Furthermore, we identify regions in phase space, where quantum effects strongly modify the differential photon distribution, even in the Thomson limit.