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P: Fachverband Plasmaphysik

P 16: Schwerionen- und lasererzeugte Plasmen I

P 16.9: Talk

Thursday, March 13, 2008, 18:30–18:45, 3D

Electron Acceleration in the Bubble Regime with a multi TW sub-10fs OPCPA System — •Karl Schmid^1,2, Franz Tavella¹, Laszlo Veisz¹, Sofia Benavides¹, Raphael Tautz¹, Ullrich Schramm⁴, Bernhard Hidding⁶, Andrius Marcinkevicius³, Michael Geissler⁵, Jürgen Meyer-ter-Vehn¹, Dietrich Habs², and Ferenc Krausz¹ — ¹Max-Planck-Institut fuer Quantenoptik, Hans-Kopfermann-Strasse 1, 85748 Garching, Germany — ²Department für Physik der LMU München, Am Coulombwall 1, 85748 Garching, Germany — ³IMRA America Inc., 1044 Woodridge Avenue, Ann Arbor, Michigan 48105, USA — ⁴Forschungszentrum Dresden-Rossendorf e. V., Bautzner Landstraße 128, 01328 Dresden, Germany — ⁵Queen's University Belfast, Belfast BT7 1NN (UK) — ⁶Heinrich-Heine-Universitaet Duesseldorf, Universitaetsstrasse 1, 40225 Duesseldorf, Germany

We present the first experimental realization of a relativistic laser-plasma electron accelerator that is able to directly access the so-called bubble regime. In contrast to earlier experiments the ultrashort laser pulses applied in this experiment provide 50 mJ on target at pulse durations of 8.5 fs. These pulses, generated by a novel ultra broadband non-collinear OPCPA, allow us to operate in the bubble regime without relying on self modulation of the laser pulse in the plasma, producing electron energies of up to 35 MeV. We present first experimental evidence of more stable operation of the electron acceleration process and of improved efficiency due to less background of low energy electrons in the electron beam.