Regensburg 2016 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 11: Poster
DF 11.1: Poster
Mittwoch, 9. März 2016, 18:00–20:00, Poster E
Excitation and relaxation dynamics of electrons in dielectrics irradiated by intense, ultrashort laser pulses — •Nils Brouwer and Bärbel Rethfeld — Fachbereich Physik und Landesforschungszentrum Optimas, TU Kaiserslautern
Ultrashort laser pulses of high intensity are of increasing importance in material processing and fundamental research. In order to control or avoid laser damage to transparent dielectrics, a proper understanding of the involved microscopic processes is necessary.
When a transparent dielectric is irradiated by an intense laser pulse, electrons are exited to the conduction band first by multiphoton or tunnel ionization. These electrons than absorb more laser energy and can then ionize further electrons by impact ionization. To determine material damage, it is necessary to investigate the coupling of the electrons to the lattice.
We model the electron and phonon non-equilibrium dynamics of laser excited dielectrics using Boltzmann collision integrals to calculate the respective distribution functions1,2. We analyse the intra- and interband relaxation dynamics and we calculate the transient non-equilibrium electron-phonon energy transfer rate during intense laser irradiation and compare our results with rates of thermalized electron systems.
[1] A. Kaiser, B. Rethfeld, M. Vicanek, G. Simon,
Phys. Rev. B 61, 11437 (2000)
[2] N. Brouwer and B. Rethfeld, JOSA B 31, C28 (2014)