Distinguishing Raman from strongly coupled Brillouin amplification for short pulses

Qing Jia; Ido Barth; Matthew R. Edwards; Julia M. Mikhailova; Nathaniel J. Fisch

doi:10.1063/1.4951027

Distinguishing Raman from strongly coupled Brillouin amplification for short pulses

Qing Jia, Ido Barth, Matthew R. Edwards, Julia M. Mikhailova, Nathaniel J. Fisch

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22 Scopus citations

Abstract

Plasma-based amplification by strongly coupled Brillouin scattering has recently been suggested for the compression of a short seed laser to ultrahigh intensities in sub-quarter-critical-density plasmas. However, by employing detailed spectral analysis of particle-in-cell simulations in the same parameter regime, we demonstrate that, in fact, Raman backscattering amplification is responsible for the growth and compression of the high-intensity, leading spike, where most of the energy compression occurs, while the ion mode only affects the low-intensity tail of the amplified pulse. The critical role of the initial seed shape is identified. A number of subtleties in the numerical simulations are also pointed out.

Original language	American English
Article number	053118
Journal	Physics of Plasmas
Volume	23
Issue number	5
DOIs	https://doi.org/10.1063/1.4951027
State	Published - 1 May 2016
Externally published	Yes

Bibliographical note

Funding Information:
This work was supported by the U.S. DTRA Grant No. HDTRA1-11-1-0037, AFOSR Grant No. FA9550-15-1-0391, NNSA Grant No. DE-NA0002948, and the U.S. DOE Grant No. DE-AC02-09CH1-1466. The authors gratefully acknowledge A. A. Balakin and C. Z. Xiao for the constructive discussions. M.R.E. acknowledges the support of the NSF through a Graduate Research Fellowship. This work was partially performed at PPPL's Research Computing Center and the High Performance Computing Center at Princeton University. The development of the EPOCH code was funded in part by UK EPSRC Grant Nos. EP/G054950/1, EP/G056803/1, EP/G055165/1, and EP/M022463/1.

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© 2016 Author(s).

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10.1063/1.4951027

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title = "Distinguishing Raman from strongly coupled Brillouin amplification for short pulses",

abstract = "Plasma-based amplification by strongly coupled Brillouin scattering has recently been suggested for the compression of a short seed laser to ultrahigh intensities in sub-quarter-critical-density plasmas. However, by employing detailed spectral analysis of particle-in-cell simulations in the same parameter regime, we demonstrate that, in fact, Raman backscattering amplification is responsible for the growth and compression of the high-intensity, leading spike, where most of the energy compression occurs, while the ion mode only affects the low-intensity tail of the amplified pulse. The critical role of the initial seed shape is identified. A number of subtleties in the numerical simulations are also pointed out.",

author = "Qing Jia and Ido Barth and Edwards, {Matthew R.} and Mikhailova, {Julia M.} and Fisch, {Nathaniel J.}",

note = "Funding Information: This work was supported by the U.S. DTRA Grant No. HDTRA1-11-1-0037, AFOSR Grant No. FA9550-15-1-0391, NNSA Grant No. DE-NA0002948, and the U.S. DOE Grant No. DE-AC02-09CH1-1466. The authors gratefully acknowledge A. A. Balakin and C. Z. Xiao for the constructive discussions. M.R.E. acknowledges the support of the NSF through a Graduate Research Fellowship. This work was partially performed at PPPL's Research Computing Center and the High Performance Computing Center at Princeton University. The development of the EPOCH code was funded in part by UK EPSRC Grant Nos. EP/G054950/1, EP/G056803/1, EP/G055165/1, and EP/M022463/1. Publisher Copyright: {\textcopyright} 2016 Author(s).",

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AU - Jia, Qing

AU - Barth, Ido

AU - Edwards, Matthew R.

AU - Mikhailova, Julia M.

AU - Fisch, Nathaniel J.

N1 - Funding Information: This work was supported by the U.S. DTRA Grant No. HDTRA1-11-1-0037, AFOSR Grant No. FA9550-15-1-0391, NNSA Grant No. DE-NA0002948, and the U.S. DOE Grant No. DE-AC02-09CH1-1466. The authors gratefully acknowledge A. A. Balakin and C. Z. Xiao for the constructive discussions. M.R.E. acknowledges the support of the NSF through a Graduate Research Fellowship. This work was partially performed at PPPL's Research Computing Center and the High Performance Computing Center at Princeton University. The development of the EPOCH code was funded in part by UK EPSRC Grant Nos. EP/G054950/1, EP/G056803/1, EP/G055165/1, and EP/M022463/1. Publisher Copyright: © 2016 Author(s).

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N2 - Plasma-based amplification by strongly coupled Brillouin scattering has recently been suggested for the compression of a short seed laser to ultrahigh intensities in sub-quarter-critical-density plasmas. However, by employing detailed spectral analysis of particle-in-cell simulations in the same parameter regime, we demonstrate that, in fact, Raman backscattering amplification is responsible for the growth and compression of the high-intensity, leading spike, where most of the energy compression occurs, while the ion mode only affects the low-intensity tail of the amplified pulse. The critical role of the initial seed shape is identified. A number of subtleties in the numerical simulations are also pointed out.

AB - Plasma-based amplification by strongly coupled Brillouin scattering has recently been suggested for the compression of a short seed laser to ultrahigh intensities in sub-quarter-critical-density plasmas. However, by employing detailed spectral analysis of particle-in-cell simulations in the same parameter regime, we demonstrate that, in fact, Raman backscattering amplification is responsible for the growth and compression of the high-intensity, leading spike, where most of the energy compression occurs, while the ion mode only affects the low-intensity tail of the amplified pulse. The critical role of the initial seed shape is identified. A number of subtleties in the numerical simulations are also pointed out.

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Distinguishing Raman from strongly coupled Brillouin amplification for short pulses

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