Bochum 2015 – wissenschaftliches Programm

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K: Fachverband Kurzzeitphysik

K 1: Licht- und Strahlungsquellen, EUV

K 1.3: Vortrag

Montag, 2. März 2015, 14:40–15:00, HZO 40

Plasma-based generation of ultra-short relativistic laser pulses via nonlinear parametric scattering — •Götz Lehmann, Friedrich Schluck, and Karl-Heinz Spatschek — Institut für Theoretische Physik I, Heinrich-Heine Universität, 40225 Düsseldorf, Germany

With current solid-state technology it is possible to generate laser pulses of few fs duration with up to a Petawatt peak power, intensities of 10²² W/cm² can be reached in the focal spot. Most of the high-power systems today are based on the chirped pulse amplification (CPA) technique, being limited in maximum intensity due to optical damage thresholds of the solid state components. However reaching intensities of 10²⁵ W/cm² and beyond would open up the possibility to access for example nonlinear QED effects (e.g. pair-creation) directly with optical fields.

The use of plasma as an amplification medium is currently discussed because of the absence of a damage threshold in the classical sense. Via parametric scattering off a plasma oscillation the energy from a long pump pulse can be transferred into a short seed pulse, thus amplifying the seed. In the nonlinear regime the seed amplitude will become larger than that of the pump. The plasma oscillation can either be an electron Langmuir wave (Raman scattering) or a low frequency ion wave (Brillouin scattering).

We will present a short overview of possible amplification scenarios and motivate in particular our interest in (strongly-coupled) Brillouin scattering as a robust amplification process.