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We present a detailed study of the electric and magnetic fields, which arecreated on plasma vacuum interfaces as a result of highly intenselaser-matter-interactions. For the field generation ultra-thin polymer foilswere irradiated with high intensity femtosecond and picosecond laser pulseswith ultra-high contrast. To determine the temporal evolution and the spatialdistribution of these fields the proton streak deflectometry method has beendeveloped further and applied in two different imaging configurations. Itenabled us to gather complementary information about the investigated fieldstructure, in particular about the influence of different field components(parallel and normal to the target surface) and the impact of a moving ionfront. The applied ultra-high laser contrast significantly increased thereproducibility of the experiment and improved the accuracy of the imagingmethod. In order to explain the experimental observations, which were obtainedby applying ultra-short laser pulses, two different analytical models have beenstudied in detail. Their ability to reproduce the streak deflectometrymeasurements was tested on the basis of three-dimensional particle simulations.A modification and combination of the two models allowed for an extensive andaccurate reproduction of the experimental results in both imagingconfigurations. The controlled change of the laser pulse duration from 50femtoseconds to 2.7 picoseconds led to a transition of the dominating forceacting on the probing proton beam at the rear side of the polymer foil. Theapplied proton deflectometry method allowed for an unambiguous determination ofthe magnetic field polarity at the rear side of the ultra-thin foil.

Tracing dynamics of laser-induced fields on ultra-thin foils using complementary imaging with streak deflectometry