Measurement of the temporal, spatial, and saturation behavior of stimulated Brillouin scattering

Journal Article · Tue Jul 01 04:00:00 EDT 1986 · Phys. Fluids; (United States)

DOI:https://doi.org/10.1063/1.865567· OSTI ID:5791762

Bernard, J E; Meyer, J

The temporal growth rates, spatial behavior, and saturation characteristics of stimulated Brillouin scattering (SBS) occurring in a CO/sub 2/ laser--gas jet experiment are investigated experimentally by picosecond Thomson scattering of ruby laser light as well as by intensity and spectral measurements of the backscattered light. Exponential temporal growth of the ion acoustic waves was observed and found to have a growth rate in good agreement with theory. Spatial modulations in the ion-acoustic-wave amplitude resulting from plasma inhomogeneities were found to limit the backscattered reflectivity to less than 10%. The ion acoustic waves saturate at a fluctuation amplitude of <20%. Ion trapping is shown to account for the observed saturation as well as temporal modulations in the ion-acoustic-wave amplitude and sibebands in the backscattered spectra.

• Research Organization: Department of Physics, University of British Columbia, Vancouver, British Columbia, Canada V6T 2A6
• OSTI ID: 5791762
• Journal Information: Phys. Fluids; (United States), Journal Name: Phys. Fluids; (United States) Vol. 29:7; ISSN PFLDA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700107* -- Fusion Energy-- Plasma Research-- Instabilities
700108 -- Fusion Energy-- Plasma Research-- Wave Phenomena
ABSORPTION
AMPLITUDES
BACKSCATTERING
BRILLOUIN EFFECT
CARBON DIOXIDE LASERS
CHARGED PARTICLES
COHERENT SCATTERING
ELECTROMAGNETIC RADIATION
ENERGY ABSORPTION
FLUIDS
FREQUENCY MEASUREMENT
GAS LASERS
GASES
INELASTIC SCATTERING
INHOMOGENEOUS PLASMA
INSTABILITY GROWTH RATES
ION ACOUSTIC WAVES
ION WAVES
IONS
JETS
LASER RADIATION
LASERS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
PLASMA
PLASMA WAVES
RADIATIONS
REFLECTIVITY
RUBY LASERS
SATURATION
SCATTERING
SOLID STATE LASERS
SURFACE PROPERTIES
THOMSON SCATTERING
TRAPPING