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Q: Fachverband Quantenoptik und Photonik
Q 55: Poster III
Q 55.38: Poster
Donnerstag, 5. März 2009, 16:30–19:00, VMP 8 Foyer
Interplay between absorption, dispersion and refraction in high-order harmonic generation — •Hatem Dachraoui1, Thierry Auguste2, Andreas Helmstedt1, Peter Bartz1, Martin Michelswirth1, Norbert Mueller1, Walter Pfeiffer1, Pascal Salieres2, and Ulrich Heinzmann1 — 1Fakultät für Physik, Universität Bielefeld, Universitätsstr. 25 33615 Bielefeld, Germany — 2CEA-Saclay, IRAMIS, Service des Photons Atomes et Molaecules, F-91191 Gif-sur-Yvette, France
The high-order harmonic generation efficiency in Neon gas cell at high pumping energy is experimentally and theoretically examined. The dependence of the cutoff and of the plateau harmonics efficiency on gas pressure, interaction length and Laser intensity provides information about the interplay between the different terms entering the phase-matching relation. In particular, the dispersion because of free electrons and atoms and the re-absorption of the harmonics by the medium are relevant. Both simulations and experiments show that the interaction length and gas pressure may be used to control the cutoff harmonics.