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Thomson Scattering with Gain.

D Turnbull1, A L Milder1, R K Follett1

  • 1University of Rochester, Laboratory for Laser Energetics, Rochester, New York, USA.

Physical Review Letters
|April 17, 2026
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Summary
This summary is machine-generated.

Convective gains from stimulated Raman and Brillouin scattering instabilities significantly alter Thomson-scattering signals. Accounting for these plasma instabilities is crucial for accurate measurements, preventing common errors in data analysis.

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Area of Science:

  • Plasma physics
  • Laser-plasma interactions

Background:

  • Thomson scattering is a key diagnostic for plasma properties.
  • Stimulated scattering instabilities can affect scattered light.
  • Previous Thomson scattering measurements have overlooked instability effects.

Purpose of the Study:

  • To highlight the impact of convective gains from stimulated scattering on Thomson scattering signals.
  • To emphasize the necessity of accounting for instability growth in Thomson scattering analysis.

Main Methods:

  • Analysis of how convective gains modify Thomson scattering signals.
  • Examination of the effects on Stokes and anti-Stokes features.

Main Results:

  • Convective gains amplify and narrow Stokes-shifted scattered light.
  • Blueshifted (anti-Stokes) features are depleted and broadened by gain.
  • The relative prominence of spectral features indicates gain presence.

Conclusions:

  • Instability growth is a significant factor in Thomson scattering.
  • Ignoring convective gains leads to errors in Thomson scattering measurements.
  • Accurate Thomson scattering requires incorporating plasma instability physics.