Berlin 2014 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 6: Theory and Modelling

P 6.7: Vortrag

Montag, 17. März 2014, 18:00–18:15, SPA HS202

Non-filamentated ultra-intense and ultra-short pulses in Raman seed amplification — •Götz Lehmann and Karl-Heinz Spatschek — Theoretische Physik I, Heinrich-Heine Universität, Düsseldorf

Ultra-intense and ultra-short laser pulses may be generated up to the exawatt-zetawatt regime due to parametric processes in plasmas. The minimization of unwanted plasma processes leads to operational limits, which we discuss with respect to filamentation. It is shown that the limit for transverse filamentation, which originally was derived for plane waves, is actually less stringent for seed pulse propagation. Because of fast motion, the leading pulse-front can stay filamentation-free, whereas the rear parts show transverse modulations. Results from two-dimensional and three-dimensional three-wave-interaction models are compared with PIC and Vlasov simulations. Although wave-breaking occurs, the kinetic simulations show that the leading pumped pulse develops a form similar to that obtained from the three-wave-interaction model.