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Title: Amplification of mid-infrared lasers via backscattering in magnetized plasmas

Abstract

We report that plasmas may be used as gain media for amplifying intense lasers, and external magnetic fields may be applied to improve the performance. For midinfrared lasers, the requisite magnetic field is on the megagauss scale, which can already be provided by current technologies. Designing the laser amplifier requires knowing the magnetized three-wave coupling coefficient, which is mapped out systematically in this paper. By numerically evaluating its formula, we demonstrate how the coupling coefficient depends on the angle of wave propagation, laser polarization, magnetic field strength, plasma temperature, and plasma density in the backscattering geometry. In conclusion, since the mediation is now provided by magnetized plasma waves, the coupling can differ significantly from unmagnetized Raman and Brillouin scatterings.

Authors:
ORCiD logo [1]; ORCiD logo [2]
+ Show Author Affiliations
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Princeton Univ., NJ (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1544946
Alternate Identifier(s):
OSTI ID: 1544599
Report Number(s):
LLNL-JRNL-771568
Journal ID: ISSN 1070-664X; 962929
Grant/Contract Number:  
AC52-07NA27344; NA0003871; 19-ERD-038
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 26; Journal Issue: 7; 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

Shi, Yuan, and Fisch, Nathaniel J. Amplification of mid-infrared lasers via backscattering in magnetized plasmas. United States: N. p., 2019. Web. doi:10.1063/1.5099513.
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Shi, Yuan, & Fisch, Nathaniel J. Amplification of mid-infrared lasers via backscattering in magnetized plasmas. United States. https://doi.org/10.1063/1.5099513
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Shi, Yuan, and Fisch, Nathaniel J. Wed . "Amplification of mid-infrared lasers via backscattering in magnetized plasmas". United States. https://doi.org/10.1063/1.5099513. https://www.osti.gov/servlets/purl/1544946.
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@article{osti_1544946,
title = {Amplification of mid-infrared lasers via backscattering in magnetized plasmas},
author = {Shi, Yuan and Fisch, Nathaniel J.},
abstractNote = {We report that plasmas may be used as gain media for amplifying intense lasers, and external magnetic fields may be applied to improve the performance. For midinfrared lasers, the requisite magnetic field is on the megagauss scale, which can already be provided by current technologies. Designing the laser amplifier requires knowing the magnetized three-wave coupling coefficient, which is mapped out systematically in this paper. By numerically evaluating its formula, we demonstrate how the coupling coefficient depends on the angle of wave propagation, laser polarization, magnetic field strength, plasma temperature, and plasma density in the backscattering geometry. In conclusion, since the mediation is now provided by magnetized plasma waves, the coupling can differ significantly from unmagnetized Raman and Brillouin scatterings.},
doi = {10.1063/1.5099513},
journal = {Physics of Plasmas},
number = 7,
volume = 26,
place = {United States},
year = {Wed Jul 24 00:00:00 EDT 2019},
month = {Wed Jul 24 00:00:00 EDT 2019}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1063/1.5099513
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Cited by: 3 works
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Figures / Tables:

FIG. 1 FIG. 1: Characteristic frequencies in magnetized hydrogen plasmas with density ne = ni = 1018 cm−3 and temperature Te = Ti = 10 eV. The cutoff frequencies ωR (blue) and ωL (yellow) split further from the plasma frequency ωp (red) in larger magnetic fields B0. Resonant backscattering with ω1 =more » ω2 +ω3 and k1 = k2 +k3 can occur both when the pump frequency ω1 (black) is above cutoff frequencies (left inset) and below resonance frequencies (right inset). In these insets, wave dispersion relations are shown for θ1 ≲ 90°, where the cold-resonance frequencies are ωUH (purple) and ωLH (green). The grey line across the diagonal marks the electron-cyclotron frequency. The top axis marks where |Ωe| equals to characteristic frequencies of three-wave interactions, where cs is the sound speed.« less
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    FIG. 3 (p. 6)figure
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