Regions for Brillouin seed pulse growth in relativistic laser-plasma interaction

Parametric plasma processes received renewed interest in the context of generating ultraintense and ultrashort laser pulses up to the exawatt-zetawatt regime. For Brillouin scattering and seed pulse amplification at high intensities, the strong coupling regime is of special interest. The intensity-d...

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Bibliographic Details
Published in:Physics of plasmas 2012-09, Vol.19 (9)
Main Authors: Lehmann, G., Schluck, F., Spatschek, K. H.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
AMPLIFICATION
AMPLITUDES
BEAM-PLASMA SYSTEMS
BRILLOUIN EFFECT
Brillouin zone
Circular polarization
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Computer simulation
COMPUTERIZED SIMULATION
Instability
INTERACTIONS
LASER RADIATION
Lasers
Mathematical analysis
PARAMETRIC INSTABILITIES
Plasmas
POLARIZATION
PULSES
RELATIVISTIC PLASMA
RELATIVISTIC RANGE
Seeds
STRONG-COUPLING MODEL
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Summary:Parametric plasma processes received renewed interest in the context of generating ultraintense and ultrashort laser pulses up to the exawatt-zetawatt regime. For Brillouin scattering and seed pulse amplification at high intensities, the strong coupling regime is of special interest. The intensity-driven low-frequency modes depend on the amplitudes of the laser fields. It is investigated here how these modes develop in the relativistic regime. Then, a unified treatment of Raman and Brillouin processes becomes necessary. Assuming circular polarization, it is shown that with increasing intensity an overlap of the originally different Raman, Brillouin, and modulational instability branches occurs. Numerical simulations with a linearized Maxwell-fluid code confirm the analytically predicted behavior.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.4754698