The coupling of stimulated Raman and Brillouin scattering in a plasma

Technical Report · Mon Sep 19 04:00:00 EDT 1988

DOI:https://doi.org/10.2172/5468785· OSTI ID:5468785

Umstadter, D; Mori, W B; Joshi, C ^[1]

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1. Lawrence Livermore National Lab., CA (USA)

The observation of an anti-Stokes satellite in the spectrum of light backscattered from a CO{sub 2} laser plasma is reported. Its origin is found to be Thomson scattering of the incident light from a counterpropagating mode-coupled plasma wave. The parent electron and ion waves in the mode-coupling process were driven by stimulated Raman and Brillouin backscattering. The parent and daughter plasma waves were detected by ruby laser Thomson scattering. A computer simulation modeling the experiment shows further cascading of the Stokes backscattered light to lower frequencies, apparently due to its rescattering by another, higher phase velocity, counterpropagating coupled mode. Comparisons with theoretical predictions are presented. 16 refs., 4 figs.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• Sponsoring Organization: DOE/ER; NSF
• DOE Contract Number: AS03-83ER40120; W-7405-ENG-48
• OSTI ID: 5468785
• Report Number(s): UCRL-21248; ON: DE90002825; CNN: ECS-83-10972
• Country of Publication: United States
• Language: English

Related Subjects

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74 ATOMIC AND MOLECULAR PHYSICS
BACKSCATTERING
BRILLOUIN EFFECT
COHERENT SCATTERING
COMPUTERIZED SIMULATION
INELASTIC SCATTERING
LASER-PRODUCED PLASMA
PLASMA
PLASMA WAVES
RAMAN EFFECT
SCATTERING
SIMULATION
THOMSON SCATTERING