Hannover 2016 – scientific programme

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A: Fachverband Atomphysik

A 24: Interaction with strong or short laser pulses I

A 24.1: Talk

Wednesday, March 2, 2016, 11:00–11:15, f303

Strong-Field Breit-Wheeler Pair Production in Short Laser Pulses — •Martin J.A. Jansen and Carsten Müller — Institut für Theoretische Physik I, Heinrich-Heine-Universität Düsseldorf, Universitätsstr. 1, 40225 Düsseldorf

We study the creation of electron-positron pairs induced by the collision of an intense short laser pulse with a high-energy gamma quantum. Employing detailed S matrix calculations in the framework of laser-dressed quantum electrodynamics, energy spectra of emitted particles are obtained. These spectra reveal a rich structure, which lies in the focus of our present study [1]. Combining concepts known from bichromatic laser fields with the continuous frequency spectrum inherent to the short pulse, an intuitive model is developed which allows to understand the global form of the energy spectra in terms of multiphoton processes. Furthermore, fine structures in the spectra can be traced back to multiphoton interferences which are sensitive to the carrier-envelope phase of the short pulse.

[1] M.J.A. Jansen and C. Müller, arXiv:1511.07660 [hep-ph]