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Intense and energetic electron currents can be generated by ultra-intenselasers interacting with solid density targets. Especially for ultra-short laserpulses their temporal evolution needs to be taken into account for manynon-linear processes as instantaneous currents may differ significantly fromthe average. Hence, a dynamic model including the temporal variation of theelectron currents which goes beyond a simple bunching with twice the laserfrequency but otherwise constant current is needed. Here we present a newtime-dependent model to describe the laser generated currents and obtain simpleexpressions for the temporal evolution and resulting corrections of averages.To exemplify the model and its predictive capabilities we show the impact oftemporal evolution, spectral distribution and spatial modulations on Ohmicheating of the bulk target material.

Simple scaling equations for electron spectra, currents and bulk heating in ultra-intense short-pulse laser-solid interaction