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O: Fachverband Oberflächenphysik
O 49: Ab-initio approaches to excitations in condensed matter II
O 49.8: Vortrag
Donnerstag, 26. März 2009, 12:15–12:30, SCH 251
Tailoring High-Order Harmonics: A Computational Approach Based on Time-Dependent Density-Functional Theory — •Alberto Castro1, Ali Akbari2, Angel Rubio2, and Eberhard Gross1 — 1Freie Universität Berlin, Berlin, Germany — 2University of the Basque Country, San Sebastián, España
Atoms and molecules react in complex manners when they are irradiated with high-intensity electromagnetic pulses: multi-photon, tunnelling and over-the-barrier ionisation, laser driven photo-induced isomerisations or fragmentations, and high harmonic generation are some of the non-linear effects that are observed. The so-called pulse shaping techniques can be used to design pulses that produce a desired effect. A technologically appealing possibility is to tailor the harmonic emission spectrum: enhancement of some given orders, supressions of others, etc. We have undertaken the task of exploring this possibility from a theoretical point of view, by making use of time-dependent density-functional theory to describe the electrons, a real-space numerical representation, and various optimization techniques.