Berlin 2014 – scientific programme
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K: Fachverband Kurzzeitphysik
K 6: Laser-Materie-Wechselwirkung und Laseranwendungen III
K 6.2: Talk
Tuesday, March 18, 2014, 16:45–17:00, SPA SR203
Real Time Observation of Transient Electron Density in High Bandgap Dielectrics Irradiated with Tailored Femtosecond Laser Pulses — •Nadine Götte1, Thomas Winkler1, Cristian Sarpe1, Bastian Zielinski1, Jens Köhler1, Thomas Kusserow2, Tamara Meinl2, Yousuf Khan2, Hartmut Hillmer2, Matthias Wollenhaupt1, Arne Senftleben1, and Thomas Baumert1 — 1University of Kassel, Institute of Physics and CINSaT, D–34132 Kassel, Germany — 2University of Kassel, Institute of Nanostructure Technologies and Analytics and CINSaT, D–34132 Kassel, Germany
The generation of a high density free electron plasma is the first step in the laser ablation of dielectric 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].
In this study ionization mechanism in dielectrics irradiated with bandwidth-limited and temporally asymmetric femtosecond laser pulses are investigated via ultrafast spectral interferometry [2]. An extremely stable common-path interferometer is used to extract accurate information about the electron plasma and its dynamics. Our measurements directly prove that temporally, asymmetric shaped pulses control the ionization mechanism through which the free electrons are generated in high band gap transparent dielectrics.
[1] L. Englert et al., J. Laser Appl., 24, 042002 (2012)
[2] C. Sarpe et al. NJP 14, 075021, (2012)