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Title: Crossed beam energy transfer in the presence of laser speckle ponderomotive self-focusing and nonlinear sound waves

Abstract

Crossed beam energy transfer, CBET, is investigated by taking into account the speckle structure of smoothed laser beams that overlap in a plasma with an inhomogeneous flow profile. Using the two-dimensional simulation code Harmony, it is shown how ponderomotive self-focusing of laser speckles in crossing beams can significantly affect the transfer of energy from one beam to the other. The role of plasma flow in speckle self-focusing is investigated and revisited, in particular its consequences in terms of redirection and increasing angular spread of the laser beams due to beam bending and plasma-induced smoothing, respectively. In close-to-sonic flow, the onset of self-focusing in the beam speckle structure occurs at considerably lower beam intensities than expected for the case without flow. CBET and speckle self-focusing can, hence, occur together when two crossed beams with equal frequency resonantly exchange energy via their ponderomotively driven density perturbations flowing with sound speed. From the simulations, it is found that consequences of ponderomotive self-focusing can be expected above an average intensity threshold scaling as $$I_L~ 2 × 10^{14} W cm^{-2}(λ_0/1 μm)^{-2}(T_e/ keV)$$, with an impact on the spatial and temporal coherence of the transmitted light. The density perturbations due to the ponderomotive force of the crossing beams can locally be enhanced in self-focusing speckles, partly leading to shock-like structures. These structures eventually increase the effect of plasma-induced smoothing and are at the origin of the stronger angular spread.

Authors:
ORCiD logo [1];  [1];  [2];  [1]
+ Show Author Affiliations
  1. Ecole Polytechnique, Palaiseau (France). Centre de Physique Théorique (CPHT)
  2. Univ. of Alberta, Edmonton, AB (Canada); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1604920
Alternate Identifier(s):
OSTI ID: 1598392
Grant/Contract Number:  
AC02-76SF00515; 633053; FWP100182
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 27; Journal Issue: 2; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Speed of sound; Plasma waves; Plasma instabilities; Acoustic waves; Laser plasma interactions; Ponderomotive force

Citation Formats

Hüller, S., Raj, G., Rozmus, W., and Pesme, D. Crossed beam energy transfer in the presence of laser speckle ponderomotive self-focusing and nonlinear sound waves. United States: N. p., 2020. Web. doi:10.1063/1.5125759.
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Hüller, S., Raj, G., Rozmus, W., & Pesme, D. Crossed beam energy transfer in the presence of laser speckle ponderomotive self-focusing and nonlinear sound waves. United States. https://doi.org/10.1063/1.5125759
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Hüller, S., Raj, G., Rozmus, W., and Pesme, D. Fri . "Crossed beam energy transfer in the presence of laser speckle ponderomotive self-focusing and nonlinear sound waves". United States. https://doi.org/10.1063/1.5125759. https://www.osti.gov/servlets/purl/1604920.
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@article{osti_1604920,
title = {Crossed beam energy transfer in the presence of laser speckle ponderomotive self-focusing and nonlinear sound waves},
author = {Hüller, S. and Raj, G. and Rozmus, W. and Pesme, D.},
abstractNote = {Crossed beam energy transfer, CBET, is investigated by taking into account the speckle structure of smoothed laser beams that overlap in a plasma with an inhomogeneous flow profile. Using the two-dimensional simulation code Harmony, it is shown how ponderomotive self-focusing of laser speckles in crossing beams can significantly affect the transfer of energy from one beam to the other. The role of plasma flow in speckle self-focusing is investigated and revisited, in particular its consequences in terms of redirection and increasing angular spread of the laser beams due to beam bending and plasma-induced smoothing, respectively. In close-to-sonic flow, the onset of self-focusing in the beam speckle structure occurs at considerably lower beam intensities than expected for the case without flow. CBET and speckle self-focusing can, hence, occur together when two crossed beams with equal frequency resonantly exchange energy via their ponderomotively driven density perturbations flowing with sound speed. From the simulations, it is found that consequences of ponderomotive self-focusing can be expected above an average intensity threshold scaling as $I_L~ 2 × 10^{14} W cm^{-2}(λ_0/1 μm)^{-2}(T_e/ keV)$, with an impact on the spatial and temporal coherence of the transmitted light. The density perturbations due to the ponderomotive force of the crossing beams can locally be enhanced in self-focusing speckles, partly leading to shock-like structures. These structures eventually increase the effect of plasma-induced smoothing and are at the origin of the stronger angular spread.},
doi = {10.1063/1.5125759},
journal = {Physics of Plasmas},
number = 2,
volume = 27,
place = {United States},
year = {Fri Feb 07 00:00:00 EST 2020},
month = {Fri Feb 07 00:00:00 EST 2020}
}
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https://doi.org/10.1063/1.5125759
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