Dresden 2017 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 16: Ultrafast Phenoma II
HL 16.6: Vortrag
Montag, 20. März 2017, 16:45–17:00, POT 51
Towards fs-time-resolved spectroscopic ellipsometry — •Oliver Herrfurth1, Steffen Richter1, Mateusz Rebarz2, Miroslav Kloz2, Shirly Espinoza2, Jakob Andreasson2,3, Marius Grundmann1, and Rüdiger Schmidt-Grund1 — 1Universität Leipzig, Institut für Experimentelle Physik II, Linnéstraße 5, 04103 Leipzig — 2ELI Beamlines, Institute of Physics, Czech Academy of Science, Na Slovance 2, 182 21 Prague, Czech Republic — 3Condensed Matter Physics, Department of Physics, Chalmers University of Technology, Gothenburg, Sweden
We report on recent progress in developing a spectroscopic ellipsometer with femtosecond time-resolution, which can be realised employing a pump-probe technique. The third harmonic of an amplified Ti:Sa laser (6 mJ,35 fs) is used as pump pulse and its fundamental wavelength is used to create a supercontinuum white light probe by focussing onto CaF2. This method allows to probe a spectral range from 340 nm to 1000 nm with a single shot. The time resolution is set by the temporal width of the probe pulse. Pump-probe reflectometry measurements on a c-plane ZnO thin film were successfully conducted yielding first insight in the ultrafast carrier dynamics, which is particularly interesting for understanding the physical processes ruling lasing operation. First results on the respective temporal evolution of the dielectric function will be discussed.