Berlin 2014 – scientific programme
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A: Fachverband Atomphysik
A 40: Interaction with strong or short laser pulses III
A 40.5: Talk
Thursday, March 20, 2014, 15:00–15:15, BEBEL E34
Compton scattering of X-ray photons assisted by a strong laser pulse — •Daniel Seipt1,2 and Burkhard Kämpfer2,3 — 1Helmholtz-Institut Jena, Fröbelstieg 3, 07743 Jena — 2Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstr. 400, 01328 Dresden — 3TU Dresden, Institut für Theoretische Physik, 01062 Dresden
The presence of a strong optical laser pulse modifies the spectral distribution and polarization properties of hard X-ray photons scattered off free electrons. We discuss this process of laser assisted Compton scattering, taking into account the finite pulse length of both the high-intensity laser and the X-rays. Side-bands emerge in the energy spectrum via non-linear frequency mixing and multi-photon effects are amplified by the large frequency ratio. Up to 1000 laser photons can be scattered together with an X-ray photon—the side-bands form a broad plateau of several keV width—for laser intensities of 1018 W/cm2. The photons in the side-bands experience a polarization rotation due to the non-linear mixing of X-ray and laser photons.