Observation of polarization dependent Raman scattering in a large scale plasma illuminated with multiple laser beams

Experiments in plasmas produced with 2 mm diameter gas filled targets preheated with 10 kJ of laser energy have shown that the stimulated Raman scattering (SRS) of a high intensity, 351 nm, beam is affected by the presence of a second, counterpropagating, high intensity beam and that has its polariz...

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Bibliographic Details
Published in:Physics of plasmas 2006-08, Vol.13 (8)
Main Authors: Kirkwood, R K, Moody, J D, Niemann, C, Williams, E A, Langdon, A B, Landen, O L, Divol, L, Suter, L J, Depierreux, S, Seka, W, Departement de Conception et de Realisation des Experimentations, CEA-DIF, BP12, 91680 Bruyeres-le-Chatel, Laboratory of Laser Energetics, University of Rochester, Rochester, New York 14627
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ICF DEVICES
INERTIAL CONFINEMENT
LASER-PRODUCED PLASMA
LASERS
LIGHT TRANSMISSION
NONLINEAR PROBLEMS
PLASMA HEATING
POLARIZATION
PONDEROMOTIVE FORCE
RAMAN EFFECT
THERMONUCLEAR IGNITION
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Summary:Experiments in plasmas produced with 2 mm diameter gas filled targets preheated with 10 kJ of laser energy have shown that the stimulated Raman scattering (SRS) of a high intensity, 351 nm, beam is affected by the presence of a second, counterpropagating, high intensity beam and that has its polarization aligned to the first when the plasma conditions are relevant to ignition by indirect drive. Separate experiments with the crossing beam's polarization rotated to be normal to the first beam's polarization show little change in the SRS backscatter when the second beam is added, consistent with the reduction in the SRS being caused by low frequency waves driven by the ponderomotive force produced by the beating of the two beams.
ISSN:1070-664X
1089-7674