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6th JuSparc Colloquium: Femtosecond Laser Matter Interaction on Micro Scale at Moderate to High Intensity

Prof. Dr. habil. Ulrich Teubner (Hochschule Emden/Leer, Institut für Lasertechnik Ostfriesland and Carl von Ossietzky University of Oldenburg, Institute of Physics)

20.Jan.2014 14:00
Forschungszentrum Jülich, Lecture hall of the Peter Grünberg Institute, building 04.8, 2nd floor

The interaction of short and ultrashort laser pulses with matter offers great opportunities in many fields ranging from fundamental science to industrial applications. Here we present selected examples of our current research on this topic. For instance, laser material processing is possible at modest intensities and it is used for surface structuring to improve the efficiency of solar cells or to produce microstructured targets for laser-induced proton acceleration experiments. It is also used for local material modification to generate optical waveguides for sensor applications. At higher intensities, laser plasmas can be generated and their incoherent emission may be used for applications such as ultrafast x-ray diffraction experiments or EUV lithography.

On the other hand, unique intense sources of ultrashort coherent pulses at very short wavelengths may be generated via high order harmonic generation or via Mie scattering from liquid droplet sources. Furthermore, such plasmas initiated by ultrafast optical fields may be used as ultrafast optical gates to characterize femtosecond pulses (temporal evolution, timing etc.) from the optical range to the EUV (e.g. from the free-electron laser FLASH at DESY).

Finally, such plasmas may also lead to the onset of shock waves in fluids. In contrast to shock waves initiated by membrane bursts in capillaries, shock waves can now be induced on the microscale. In a new project, first basic experiments on shock wave formation, density and velocity evolution etc. have been performed. This new topic is currently attracting great interest world-wide.