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Title: X-ray amplification by stimulated Brillouin scattering

Authors:
; ;
Publication Date:
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1376964
Grant/Contract Number:
DENA0002948
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review E
Additional Journal Information:
Journal Volume: 96; Journal Issue: 2; Related Information: CHORUS Timestamp: 2017-08-25 14:40:27; Journal ID: ISSN 2470-0045
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Edwards, Matthew R., Mikhailova, Julia M., and Fisch, Nathaniel J.. X-ray amplification by stimulated Brillouin scattering. United States: N. p., 2017. Web. doi:10.1103/PhysRevE.96.023209.
Edwards, Matthew R., Mikhailova, Julia M., & Fisch, Nathaniel J.. X-ray amplification by stimulated Brillouin scattering. United States. doi:10.1103/PhysRevE.96.023209.
Edwards, Matthew R., Mikhailova, Julia M., and Fisch, Nathaniel J.. 2017. "X-ray amplification by stimulated Brillouin scattering". United States. doi:10.1103/PhysRevE.96.023209.
@article{osti_1376964,
title = {X-ray amplification by stimulated Brillouin scattering},
author = {Edwards, Matthew R. and Mikhailova, Julia M. and Fisch, Nathaniel J.},
abstractNote = {},
doi = {10.1103/PhysRevE.96.023209},
journal = {Physical Review E},
number = 2,
volume = 96,
place = {United States},
year = 2017,
month = 8
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on August 25, 2018
Publisher's Accepted Manuscript

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  • A method is presented for evaluating the amplification of a three-wave parametric instability in a medium having a slow, locally linear variation in both time and space, and is applied to the specific case of stimulated Brillouin scattering (SBS) in a plasma undergoing an isothermal rarefaction. Time dependence can substantially alter the gain of such a parametric amplifier. For SBS in a subsonic rarefaction, inclusion of time dependence eliminates the absolute instability.
  • Short light pulse amplification using the stimulated Brillouin backscattering mechanism is considered. The novel feature is that the interaction process takes place in the strongly coupled regime and therefore the pulse compression is not limited by the ion-acoustic wave period. The mechanism is very efficient due to the large ratio of light frequency to the characteristic ion-acoustic wave frequency. Although large-amplitude ion-acoustic waves are generated and subsequent wave breaking takes place, the fluid and kinetic nonlinearities do not intervene with the amplification itself.
  • The energy transfer from a long (3.5 ps) pump pulse to a short (400 fs) seed pulse due to stimulated Brillouin backscattering in the strong-coupling regime is investigated. The two pulses, both at the same wavelength of 1.057 {mu}m are quasicounterpropagating in a preformed underdense plasma. Relative amplification factors for the seed pulse of up to 32 are obtained. The maximum obtained amplified energy is 60 mJ. Simulations are in agreement with the experimental results and suggest paths for further improvement of the amplification scheme.
  • We examine the feasibility of strongly coupled stimulated Brillouin scattering as a mechanism for the plasma-based amplification of sub-picosecond pulses. In particular, we use fluid theory and particle-in-cell simulations to compare the relative advantages of Raman and Brillouin amplification over a broad range of achievable parameters.
  • Plasma amplification of low energy, a short (∼100–500 fs) laser pulse by an energetic long (∼10 ps) pulse via strong coupling Stimulated Brillouin Backscattering is investigated with an extensive analysis of one-dimensional particle-in-cell simulations. Parameters relevant to nowadays experimental conditions are investigated. The obtained seed pulse spectra are analyzed as a function of the interaction conditions such as plasma profile, pulses delay, and seed or pulse duration. The factors affecting the amount of energy transferred are determined, and the competition between Brillouin-based amplification and parasitic Raman backscattering is analyzed, leading to the optimization of the interaction conditions.