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This online Debye Colloquium, Femtosecond laserablation, hydrodynamics on picosecond timescale?, will be given by dr. Dries van Oosten from Debye's Nanophotonics research group.

Abstract

Pulsed laser are used in many areas of research and technology, to locally modify or even remove material. When femtosecond lasers are used, the physics is especially attractive, because in that case, the process consists of a chain of events that are well separated in time. Because of this separation of time-scales, we have a relatively clear phenomenological picture of what happens during the ablation process. However, this picture does not always translate to a quantitative understanding. In my presentation, I will give an overview of what we do and do not understand about femtosecond laser ablation. I will illustrate this with the results of recent experiments that we have conducted on the ablation of liquids, gels and trapped nanoparticles.