Hannover 2016 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 58: Poster: Quantum Optics and Photonics IV

Q 58.14: Poster

Thursday, March 3, 2016, 16:30–19:00, Empore Lichthof

Analytical tools for investigating strong-field QED processes in tightly focused laser fields — Antonino Di Piazza and •Alessandro Angioi — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg

The theoretical analysis of QED processes in intense laser fields has been limited to within the plane-wave approximation [1], even if the very high intensities considered in those analysis are, as of today, only reachable by focusing the laser energy almost to diffraction limit. Here we construct single-particle fermion states in the presence of a background electromagnetic field of general space-time structure within the WKB approximation [2]. Our main assumption is the realistic one that the initial energy of the electron is the largest dynamical energy scale in the problem. A substitution rule is found that allows these states to be obtained from the well-known Volkov wave functions in a plane-wave field [3]. Moreover, scalar and spinor propagators are constructed under the same approximations. The development of these tools opens in particular the possibility of investigating strong field QED processes in the presence of tightly focused strong fields analytically.

[1] A. Di Piazza et al., Rev. Mod. Phys. 84, 1177 (2012).
A. Di Piazza, Phys. Rev. Lett. 113, 040402 (2014).
A. Di Piazza, Phys. Rev. A 91, 042118 (2015).