Erlangen 2026 – wissenschaftliches Programm
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MP: Fachverband Theoretische und Mathematische Grundlagen der Physik
MP 10: Strong Fields
MP 10.7: Vortrag
Donnerstag, 19. März 2026, 15:15–15:30, KH 02.013
Status report of the photon photon scattering experiment at CALA — •Timo Pohle1, Leonard Doyle1, Fabian Schütze2,3, Pooyan Khademi2,3, Felix Karbstein2,3, Matt Zepf2,3, and Jörg Schreiber1 — 1CALA/LMU, Am Coulombwall 1, 85748 Garching — 2Helmholtz Institute Jena, Fröbelstieg 3, 07743 Jena — 3Faculty of Physics and Astronomy, Friedrich-Schiller-Universität Jena, 07743 Jena, Germany
In the Centre for Advanced Laser Applications (CALA) near Munich, an experiment is being set up with the aim of measuring photon-photon scattering in the all-optical regime. We expect tens of photon scattering when colliding two petawatt pulses from the ATLAS-3000 Laser head on. Measuring this weak signal in the environment of ultra-intense laser pulses consisting of O(1020) photons each is one of the main challenges of the experiment, which we want to overcome using the darkfield approach and a time-gated detection scheme. The quantification of this signal will help to verify the predictions made by the current theory about the quantum vacuum in a strong field environment. In my talk, I will give an overview of our planned experimental setup in combination with the expected signal yield predicted by analytical and numerical work [1] as well as report on the current progress of the implementation. Furthermore, I will show our approach to the detection of the weak signal and highlight other challenges in the realization of the experiment.
[1] Schütze et al. Phys. Rev. D 2024, 109 (9), 096009.
Keywords: strong fields