In a previous paper we showed how higher-order strong-field-QED processes in long laser
pulses can be approximated by multiplying sequences of'strong-field Mueller matrices'. We …

The current state of research on high-intensity laser fields and their interaction with charged
particles is reviewed. Data on petawatt-class laser facilities are presented, and advanced …

We study single, double and higher-order nonlinear Compton scattering where an electron
interacts nonlinearly with a high-intensity laser and emits one, two or more photons. We …

Higher-order tree-level processes in strong laser fields, ie, cascades, are in general
extremely difficult to calculate, but in some regimes the dominant contribution comes from a …

Based on strong-field QED in the Furry picture we use the Dirac-Volkov propagator to derive
a compact expression for the differential emission probability of the two-photon Compton …

A detailed analysis of the process of two-photon emission by an electron scattered from a
high-intensity laser pulse is presented. The calculations are performed in the framework of …

We isolate the two-step mechanism involving a real intermediate photon from the one-step
mechanism involving a virtual photon for the trident process in a constant crossed field. The …

Two-photon emission of an electron in an electromagnetic plane wave of vanishing
frequency is calculated. The unpolarized probability is split into a two-step process, which is …

We investigate entangled x-ray photon pair emissions in a free-electron laser (FEL) and
establish a quantum electrodynamical theory for coherently amplified entangled photon pair …

We study the trident process in laser pulses. We provide exact numerical results for all
contributions, including the difficult exchange term. We show that all terms are in general …