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K: Kurzzeitphysik
K 11: Poster
K 11.3: Poster
Mittwoch, 29. März 2006, 17:45–19:00, Flure
Ultrafast ablation of solids using a femtosecond VUV free electron laser — •Nikola Stojanovic1, K. Sokolowski-Tinten1, D. von der Linde1, U. Zastrau2, E. Förster 2, R. Sobierajski3, R. Nietubyc3, M. Jurek3, J. Krzywinski3, L. Juha4, J. Cihelka4, A. Velyhan4, J. Kuba4, J. Chalupský4, T. Tschentscher5, and S. Toleikis5 — 1Institut für experimentelle Physik, Lotharstr. 1, 47048 Duisburg, Germany — 2Institute for Optics and Quantum Electronics, Max-Wien-Platz 1, 07743 Jena , Germany — 3Institute of Physics PAS, AL. Lotnikow 32/46, PL-02-668 Warsaw, Poland — 4Institute of Physics, Na Slovance 2, 182 21 Praha 8, Czech Republic — 5HASYLAB at DESY, Notkestr. 85, 22603 Hamburg, Germany
The VUV-FEL at DESY in Hamburg/Germany (see www-hasylab.desy.de/facility/fel/vuv) represents a unique source of ultrashort (30 fs), high energy (50 microJ) short wavelength (32 nm) radiation. It is worldwide the first SASE-FEL operating in this wavelength regime and user operation started in July 2005. This talk will discuss the results of first experiments on the interaction of such high intensity VUV-pulses with solids. In a VUV-pump-optical-probe experiment, picosecond optical imaging has been used to follow the reflectivity evolution of the VUV-irradiated surfaces with spatial and temporal resolution. The time-resolved measurements are supplemented by an analysis of the permanent structural surface modifications. Compared to femtosecond optical excitation, the large absorption depths of the 30 nm radiation in some materials (i.e. Si) leads to distinct differences in the material response.