Control and ultra-short pulse generation in stimulated Raman backscattering

A stimulated Raman scattering (SRS) is a great concern for laser fusion, causing an energy and symmetry loss and target preheating. In particular, for dominating backward- SRS (BRS), a complexity of nonlinear saturation was revealed. Recently, to develop lasers at multi-exawatts and beyond, relevant...

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Bibliographic Details
Published in:Journal of physics. Conference series 2016-03, Vol.688 (1), p.12112
Main Authors: Škori, Miloš M., Nikoli, Ljubomir, Had ievski, Ljup o, Batani, Dimitri, Ishiguro, Seiji, Mima, Kunioki
Format: Article
Language:English
Subjects:
Backscattering
Foils
Frequency shift
Heating
Laser fusion
Physics
Pulsation
Raman spectra
Saturation
Short pulses
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Summary:A stimulated Raman scattering (SRS) is a great concern for laser fusion, causing an energy and symmetry loss and target preheating. In particular, for dominating backward- SRS (BRS), a complexity of nonlinear saturation was revealed. Recently, to develop lasers at multi-exawatts and beyond, relevant to high-energy physics, a proposed Raman amplification based on BRS met a restrictive operation window. Here, we stress BRS generics that due to a nonlinear frequency shift (relativistic trapping effect), it nonlinearly saturates with intermittent pulsations. A "break up" of Manley-Rowe invariants explains a non-steady saturation. Further, a coherent pulsation BRS regime is proposed for femto-sec pulse generation in a thin exploding foil plasma, with parameter scalings investigated by analytics and particle simulations.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/688/1/012112