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P: Fachverband Plasmaphysik

P 19: Poster Session- Laser Plasmas

P 19.6: Poster

Wednesday, March 2, 2016, 16:30–19:00, Empore Lichthof

Raman amplification in the coherent wavebreaking regime — •John Farmer and Alexander Pukhov — Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf

Raman amplification in plasma is a potential method for the creation of ultra-short, ultra-intense laser pulses. We show that in regimes far beyond the wavebreaking threshold of Raman amplification, significant amplification can occur after the onset of wavebreaking, before phase mixing destroys the coherent coupling between pump, probe and plasma wave. Amplification in this regime is therefore a transient effect, with the higher-efficiency “coherent wavebreaking” regime accessed by using a short, intense probe.

Parameter scans illustrate the marked difference in behaviour between below wavebreaking, in which the energy-transfer efficiency is high but total energy transfer is low, wavebreaking, in which efficiency is low, and coherent wavebreaking, in which moderate efficiencies allow the highest total energy transfer.