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Berlin 2014 – scientific programme

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P: Fachverband Plasmaphysik

P 27: Theory of nonideal Plasmas

P 27.2: Talk

Friday, March 21, 2014, 11:00–11:15, SPA HS201

Relativistic Frequency Synthesis of Light Fields — •Christian Rödel1,2, Erich Eckner1, Jana Bierbach1,2, Mark Yeung2,3, Brendan Dromey3, Thomas Hahn4, Silvio Fuchs1,2, Arpa Galestian1, Martin Wünsche1, Stephan Kuschel1,2, Dirk Hemmers4, Georg Pretzler4, Matthew Zepf2,3, and Gerhard Paulus1,21Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität, Jena — 2Helmholtz-Institut Jena — 3Centre for Plasma Physics, Queen's University Belfast, United Kingdom — 4Institut für Laser- und Plasmaphysik, Universität Düsseldorf

High harmonic generation from relativistically oscillating plasma surfaces typically exhibits a shallow, but generally decaying, spectral slope. We observed, however, an enhanced emission of particular harmonics for extremely steep plasma gradients approaching a step-like plasma density ramp. Numerical simulations reproduce the observations when matching the plasma conditions to those in the experiment and reveal a strong excitation of the surface plasma mode with the plasma frequency. A simple model of nonlinear frequency synthesis is able to explain the measured harmonic spectrum when relativistic nonlinear effects are taken into account. This novel type of relativistic nonlinearity may lead to a tunable, coherent XUV source of high efficiency.

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