The talk starts with an introduction into the strong-field QED applicable for the collision of a high-energy electron beam with an ultra-strong laser pulse. For this purpose, relevant influences like radiative reaction, spin dynamics and pair production are discussed. The current state of experiments both implemented and under construction are presented. Emphasis on recent progress will be given on the generation and polarization of high-energy electron, positron and gamma-ray beams, plasma diagnostics, and tests of fundamental physics.

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Christoph H. Keitel, "Extreme field physics with ultra-intense laser pulses," Proc. SPIE PC12580, Research Using Extreme Light: Entering New Frontiers with Petawatt-Class Lasers V, PC1258001 (Presented at SPIE Optics + Optoelectronics: April 24, 2023; Published: 20 July 2023); https://doi.org/10.1117/12.2670577.6329038676112.