Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 15: Poster 1: Quanteninformation, Quanteneffekte, Laserentwicklung, Laseranwendungen, Ultrakurze Pulse, Photonik
Q 15.50: Poster
Montag, 14. März 2011, 16:30–19:30, P1
Unequal spacing of attosecond pulse trains from relativistic surface high harmonic generation — •Jana Bierbach1, Christian Rödel1, 4, Michael Behmke2, Daniel an der Brügge3, Martin Heyer1, Matthias Kübel1, Monika Toncian2, Dirk Hemmers2, Oliver Jäckel1,4, Toma Toncian2, Oswald Willi2, Alexander Pukhov3, Georg Pretzler2, and Gerhard Paulus1,4 — 1Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität Jena — 2Institut für Laser- und Plasmaphysik, Heinrich-Heine Universität Düsseldorf — 3Institut für Theoretische Physik, Heinrich-Heine Universität Düsseldorf — 4Helmholtz-Institut Jena
The interaction of an intense ultrashort laser pulse with a solid density plasma leads to the emission of XUV attosecond pulses within each laser cycle. The process is very sensitive to the laser pulse contrast and the plasma scale length. We observe a strong influence of pre-plasma conditions on the spectral fine structure of high harmonic spectra. The modifications were realized by an adjustable contrast enhancement using different plasma mirror targets. While in the case of high contrast sharp harmonic lines are obtained, an intermediate contrast leads to a strongly modulated spectrum. These modulations can be explained by an unequal pulse spacing in the attosecond pulse train due to a positive linear chirp caused by the cycle averaged motion of the electron plasma surface. A simple analytical model can describe this temporal denting effect and is in good agreement with Particle-In-Cell simulations and the experiment.