Jena 2013 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 19: Poster: Theorie und Modellierung

P 19.20: Poster

Donnerstag, 28. Februar 2013, 14:00–16:00, Poster EG

Transverse effects during the ultra-short relativistic laser pulse amplifications via Raman and Brillouin processes — •Friedrich Schluck, Götz Lehmann, and Karl-Heinz Spatschek — Heinrich-Heine Universität, 40225 Düsseldorf

Plasma-based amplification stages are a key element in the plans for the next generation of high-intensity ultra-short pulse laser amplifiers (www.int-zest.com). Energy transfer from a long pump pulse to a short seed pulse can be achieved via stimulated Raman or Brillouin scattering. To achieve high efficiency, it seems favorable to operate at high plasma densities. To keep the local energy density non- or weakly relativistic, large transversal beam diameters are currently discussed. This opens up the possibility of transversal instabilities.

We study the influence of transversal instabilities on Raman and Brillouin amplification to identify parameter regimes that allow for stable operation. Starting from simplified three-wave interaction models we motivate optimal choices for plasma density and pulse parameters. The predictions are then checked by numerical simulations.