Studies of Raman scattering from overdense targets irradiated by several kilojoules of 0. 53. mu. m laser light
In this paper a study of stimulated Raman scattering (SRS) from relatively planar plasmas irradiated with short-wavelength (0.53 ..mu..m) laser light is reported. The Novette Laser Facility (Laser Part. Beams 3, 173 (1985)) produced several kilojoules of light in 1 nsec, which allowed it to irradiate a large spot with enough intensity to produce significant Raman scattering. These experiments measured the fluence, angular distribution, spectrum, and timing of the Raman light, as a function of the average laser intensity. Reductions in the Raman fluence at low laser intensity are attributed to collisional damping. The measured SRS fluence was larger than that predicted from convective amplification of bremsstrahlung noise, as calculated using the average properties of the laser beam and the plasma. Possible contributions to the observed scattering from enhanced noise, Raman scattering within filaments, and the absolute Raman instability at density extrema are discussed.
- Research Organization:
- Lawrence Livermore National Laboratory, University of California, Livermore, California 94550
- OSTI ID:
- 7062206
- Journal Information:
- Phys. Fluids; (United States), Vol. 31:10
- Country of Publication:
- United States
- Language:
- English
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Comments on ''Studies of Raman scattering from overdense targets irradiated by several kilojoules of 0. 53. mu. m laser light'' (Phys. Fluids 31, 3130 (1988))
Related Subjects
LASER-PRODUCED PLASMA
RAMAN EFFECT
AMPLIFICATION
ANGULAR DISTRIBUTION
BREMSSTRAHLUNG
COHERENT SCATTERING
COLLISIONAL PLASMA
CONVECTION
DAMPING
ENERGY SPECTRA
PLASMA DIAGNOSTICS
TARGETS
THICKNESS
DIMENSIONS
DISTRIBUTION
ELECTROMAGNETIC RADIATION
ENERGY TRANSFER
HEAT TRANSFER
MASS TRANSFER
PLASMA
RADIATIONS
SCATTERING
SPECTRA
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