Heidelberg 2015 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 42: Quantum Effects: QED II

Q 42.5: Talk

Wednesday, March 25, 2015, 15:30–15:45, B/SR

Electron polarization effects in nonlinear Compton scattering with short laser pulses. — •Oleg D. Skoromnik, Karen Z. Hatsagortsyan, Antonino Di Piazza, and Christoph H. Keitel — Max Planck Institute for Nuclear Physics, Saupfercheckweg 1, 69117 Heidelberg, Germany

The electron polarization effects in the nonlinear Compton scattering of relativistic electrons by a circularly polarized few cycle laser pulse are investigated. It is shown that a large spin asymmetry can be observed in a coincidence measurement of the scattered electrons and the emitted photons in a judiciously chosen spectral interval. In this case the spin asymmetry of the scattering is strongly dependent on the laser pulse length in a full quantum regime, when the quantum parameter χ is of the order of unity. In contrast, in the quasi-classical case (χ≪1) the asymmetry is dependent neither on the pulse length nor the intensity. The application of the effect for spin polarimetry is discussed.