Reduction of stimulated Brillouin backscattering with plasma beam smoothing

Plasma induced incoherence (PII) can strongly modify the growth rates of stimulated scattering instabilities. A special double-target design was used to quantify the effect of PII on stimulated Brillouin scattering (SBS). Successive shots using all or part of these targets led to the characterizatio...

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Bibliographic Details
Published in:Physics of plasmas 2015-04, Vol.22 (4)
Main Authors: Yahia, V., Masson-Laborde, P.-E., Depierreux, S., Goyon, C., Loisel, G., Baccou, C., Borisenko, N. G., Orekhov, A., Rienecker, T., Rosmej, O., Teychenné, D., Labaune, C.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BACKSCATTERING
BEAMS
BRILLOUIN EFFECT
Computer simulation
COMPUTERIZED SIMULATION
FOAMS
Incoherence
LASER TARGETS
LASERS
PLASMA
Plasma physics
Pulse propagation
PULSES
Reduction
Scattering
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Summary:Plasma induced incoherence (PII) can strongly modify the growth rates of stimulated scattering instabilities. A special double-target design was used to quantify the effect of PII on stimulated Brillouin scattering (SBS). Successive shots using all or part of these targets led to the characterization of temporal and spatial incoherence of a laser pulse after propagation through a foam plasma and to the quantification of the reduction of SBS from the second target. Numerical simulations were used to identify the main physical mechanisms in play.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.4918942