Advanced model for SBS of a randomized laser beam and application to polarization smoothing experiments with preformed underdense plasmas

V. T. Tikhonchuk; Julien Fuchs; C. Labaune; S. Depierreux; Hector A. Baldis; S. Hueller; J. Myatt; Denis Pesme

doi:10.1117/12.425641

23 April 2001 Advanced model for SBS of a randomized laser beam and application to polarization smoothing experiments with preformed underdense plasmas

V. T. Tikhonchuk, Julien Fuchs, C. Labaune, S. Depierreux, Hector A. Baldis, S. Hueller, J. Myatt, Denis Pesme

Author Affiliations +

Proceedings Volume 4424, ECLIM 2000: 26th European Conference on Laser Interaction with Matter; (2001) https://doi.org/10.1117/12.425641
Event: 26th European Conference on Laser Interaction with Matter (ECLIM 2000), 2000, Prague, Czech Republic

Abstract

A model is presented, which describes the stimulated Brillouin scattering (SBS) of a randomized laser beam interacting with an underdense, expanding plasma. The model accounts for the self-focusing of speckles in the regime where plasma heating has an important effect on speckle self-focusing and on SBS threshold and reflectivity. The model exhibits a good agreement with SBS levels measured at the LULI multi-beam facility for a broad range of the laser and plasma parameters and both types of beam smoothing - RPP and polarization smoothing (PS). The model and experiments confirm that eh PS technique allows to control the SBS level more efficiently than RPP.

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V. T. Tikhonchuk, Julien Fuchs, C. Labaune, S. Depierreux, Hector A. Baldis, S. Hueller, J. Myatt, and Denis Pesme "Advanced model for SBS of a randomized laser beam and application to polarization smoothing experiments with preformed underdense plasmas", Proc. SPIE 4424, ECLIM 2000: 26th European Conference on Laser Interaction with Matter, (23 April 2001); https://doi.org/10.1117/12.425641

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