Heidelberg 2015 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 62: Poster: Quantum Optics and Photonics III

Q 62.104: Poster

Donnerstag, 26. März 2015, 17:00–19:00, C/Foyer

Probing and Modeling Optical Properties of High Band Gap Dielectrics Excited by Temporally Shaped Femtosecond Laser Pulses — •Nikolai Jelzow, Thomas Winkler, Christian Sarpe, Jens Köhler, Bastian Zielinski, Nadine Götte, Arne Senfleben, and Thomas Baumert — Institute of Physics and CINSaT, University of Kassel, Kassel, Germany Heinrich-Plett-Str. 40, D-34132 Kassel, tel. +49-561-804-4405, fax. -4452

The generation of a high density free electron plasma is the first step in the laser ablation of high bandgap materials. We have demonstrated that tailored ultrashort laser pulses are suitable for robust manipulation of optical breakdown, increasing the precision of ablation to one order of magnitude below the optical diffraction limit [1, 2]. In this study ionization mechanisms in water, as a prototype for high band gap materials, irradiated with bandwidth-limited and temporally asymmetric femtosecond laser pulses are investigated via ultrafast spectral interferometry [3]. Our measurements directly prove that temporally asymmetric shaped pulses control the ionization mechanisms through which the free electrons are generated in high band gap transparent materials. In our recent experiments, we extended the investigation by measuring transmission and reflection coefficient of the pump pulse in order to reveal spatial properties of the ionization process. The results obtained, correlate to results from material processing on solid samples. [1] L. Englert et al., Opt. Expr. 15, 17855 (2007), [2] JLA 24, 042002 (2012); [3] C. Sarpe et al., NJP 14, 075021 (2012)