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Q: Fachverband Quantenoptik und Photonik
Q 10: Ultrakurze Laserpulse: Anwendungen
Q 10.2: Vortrag
Montag, 12. März 2012, 14:15–14:30, V38.01
Electron dynamics and electron-phonon coupling in laser excited dielectrics — •Nils Brouwer1, Orkhan Osmani1,2, and Bärbel Rethfeld1 — 1Technische Universität Kaiserslautern — 2Universität Duisburg-Essen
When transparent dielectrics are irradiated by intense laser pulses, electrons are excited to the conduction band by multi-photon absorption. These free electrons can absorb more photons to gain sufficient energy for impact ionization and thus excite even more electrons. We apply the Boltzmann equation to model the transient electron and phonon dynamics of dielectrics irradiated by femtosecond laser pulses. We analyze the dependence of electron-phonon coupling on pulse parameters as well as on free electron density and free electron energy density. For the equilibrium case, we calculate a density and temperature dependent electron-phonon coupling parameter suitable to enter two-temperature heat conduction equations.