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Frequency spectra of the Raman-backscattered light in an inhomogeneous plasma

Published online by Cambridge University Press:  09 March 2009

Guy Bonnaud ,
Denis Pesme  and
René Pellat
Guy Bonnaud
Affiliation:
CEA, Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve St. Georges, France
Denis Pesme
Affiliation:
CEA, Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve St. Georges, France
René Pellat
Affiliation:
Centre de Physique Théorique, Ecole Polytechnique, 91128 Palaiseau, France
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Abstract

The behavior of the stimulated Raman scattering is investigated in a laser-irradiated plasma with an inhomogeneous density profile, by means of wave-coupling simulations. In the case of a regular hydrodynamic-like profile, a spectral broadening is observed when the laser irradiance is increased and is found to result from a coupling between the convective and the absolute Raman scattering, via pump depletion. In the case where a short-scale modulation of the density is superimposed on the profile, the spectrum is strongly influenced by the propagation velocity of the modulation and by the sinusoidal/chaotic nature of the modulation.

Type
Research Article
Information
Laser and Particle Beams , Volume 9 , Issue 2 , June 1991 , pp. 477 - 492
Copyright
Copyright © Cambridge University Press 1991

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References

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