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Title: Reducing parametric backscattering by polarization rotation

Abstract

When a laser passes through underdense plasmas, Raman and Brillouin Backscattering can reflect a substantial portion of the incident laser energy. This is a major loss mechanism, for example, in employing lasers in inertial confinement fusion. But, by slow rotation of the incident linear polarization, the overall reflectivity can be reduced significantly. Particle in cell simulations show that, for parameters similar to those of indirect drive fusion experiments, polarization rotation reduces the reflectivity by a factor of 5. A general, fluid-model based analytical estimation for the reflectivity reduction agrees with simulations. However, in identifying the source of the backscatter reduction, it is difficult to disentangle the rotating polarization from the frequency separation based approach used to engineer the beam's polarization. Though the backscatter reduction arises similarly to other approaches that employ frequency separation, in the case here, the intensity remains constant in time.

Authors:
ORCiD logo [1]; ORCiD logo [1]
  1. Princeton Univ., NJ (United States). Dept. of Astrophysical Sciences
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1335465
Alternate Identifier(s):
OSTI ID: 1328135
Grant/Contract Number:  
AC02-09CH11466; NA0002948; FA9550-15-1-0391
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 23; Journal Issue: 10; 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

Citation Formats

Barth, Ido, and Fisch, Nathaniel J. Reducing parametric backscattering by polarization rotation. United States: N. p., 2016. Web. doi:10.1063/1.4964291.
Barth, Ido, & Fisch, Nathaniel J. Reducing parametric backscattering by polarization rotation. United States. doi:10.1063/1.4964291.
Barth, Ido, and Fisch, Nathaniel J. Sat . "Reducing parametric backscattering by polarization rotation". United States. doi:10.1063/1.4964291. https://www.osti.gov/servlets/purl/1335465.
@article{osti_1335465,
title = {Reducing parametric backscattering by polarization rotation},
author = {Barth, Ido and Fisch, Nathaniel J.},
abstractNote = {When a laser passes through underdense plasmas, Raman and Brillouin Backscattering can reflect a substantial portion of the incident laser energy. This is a major loss mechanism, for example, in employing lasers in inertial confinement fusion. But, by slow rotation of the incident linear polarization, the overall reflectivity can be reduced significantly. Particle in cell simulations show that, for parameters similar to those of indirect drive fusion experiments, polarization rotation reduces the reflectivity by a factor of 5. A general, fluid-model based analytical estimation for the reflectivity reduction agrees with simulations. However, in identifying the source of the backscatter reduction, it is difficult to disentangle the rotating polarization from the frequency separation based approach used to engineer the beam's polarization. Though the backscatter reduction arises similarly to other approaches that employ frequency separation, in the case here, the intensity remains constant in time.},
doi = {10.1063/1.4964291},
journal = {Physics of Plasmas},
number = 10,
volume = 23,
place = {United States},
year = {2016},
month = {10}
}

Journal Article:
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