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P: Fachverband Plasmaphysik

P 12: Poster II

P 12.18: Poster

Wednesday, March 22, 2023, 17:30–19:00, HSZ EG

Experimental determination of the phase shift upon reflection — •Johanna Köchling, Nico Potzkai, and Georg Pretzler — Institut für Laser- und Plasmaphysik, Heinrich-Heine-Universität Düsseldorf

Interferometry can determine the expansion of laser plasmas in their early stage with a temporal resolution down to 10 fs. However, with measurements in the reflection geometry, the phase shift of the light reflected at the surrounding undisturbed material must be known precisely as a reference. In this contribution, we present experimental results for this reflective phase shift for a series of thin metal layers of different thickness. The results are compared with with theory and extrapolated to other regimes.