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K: Fachverband Kurzzeitphysik

K 8: Laser - Systeme und Anwendungen II

K 8.2: Vortrag

Donnerstag, 13. März 2008, 16:45–17:00, 3E

Picosecond acoustic response in fs-laser-excited Germanium: The role of electronic and thermal pressures — •Uladzimir Shymanovich, Matthieu Nicoul, Wei Lu, Stephan Kähle, Klaus Sokolowski-Tinten, Alexander Tarasevitch, and Dietrich von der Linde — Universität Duisburg-Essen, Institut für Experimentelle Physik, Lotharstr. 1, 47048 Duisburg

Time resolved X-ray diffraction makes it possible to directly observe changes in the lattice of solids induced by fs optical excitation. Here we discuss experiments on the picosecond acoustic response in thin films of Germanium, which allowed us to distinguish the thermal and electronic pressure contributions to the laser-generated pressure. In particular, it was found that the relative contribution of the electronic pressure strongly depends on the strength of optical excitation.