Near-forward scattering of laser light

Journal Article · Thu Jul 01 04:00:00 EDT 1993 · Physics of Fluids B; (United States)

DOI:https://doi.org/10.1063/1.860696· OSTI ID:6422717

Batha, S H; Baldis, H A; Bradley, K S; Drake, R P; Estabrook, K; Johnston, T W; Montgomery, D S; Procassini, R J ^[1]

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1. Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)

Near-forward scattering of laser light in a plasma, in regimes relevant to future inertial-confinement-fusion (ICF) experiments, has been investigated experimentally. The intensity scaling of stimulated Raman scattering (SRS) forward scattering at one angle was measured from a low-[ital Z] plasma. It was found that the intensity threshold and scaling were consistent with convective theory. Forward SRS saturated at a relatively low intensity. In a second experiment using Ti plasmas, absolutely calibrated, time-resolved stimulated Brillouin scattering (SBS) spectra from up to seven different angles were measured simultaneously. It was found that the angular dependence of the scattered energy was qualitatively consistent with convective theory. The spectra provided the first evidence of near-forward SBS. Contrary to previous estimates, near-forward SBS was shown to be more efficient than oblique backscattering and may be an important effect for ICF.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6422717
• Journal Information: Physics of Fluids B; (United States), Journal Name: Physics of Fluids B; (United States) Vol. 5:7; ISSN PFBPEI; ISSN 0899-8221
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700340 -- Plasma Waves
Oscillations
& Instabilities-- (1992-)
700350* -- Plasma Production
Heating
Current Drive
& Interactions-- (1992-)
BEAM-PLASMA SYSTEMS
BRILLOUIN EFFECT
COHERENT SCATTERING
ELECTROMAGNETIC RADIATION
ELEMENTS
INSTABILITY
LASER RADIATION
LIGHT SCATTERING
METALS
PLASMA INSTABILITY
RADIATIONS
RAMAN EFFECT
SCALING
SCATTERING
TITANIUM
TRANSITION ELEMENTS