Measurement of Growth Rates and Temporal Behavior of Stimulated Raman Scattering in a CO2-Laser-Produced Plasma

1986 ◽  
Vol 57 (3) ◽  
pp. 337-340 ◽  
Author(s):  
G. McIntosh ◽  
H. Houtman ◽  
J. Meyer
Keyword(s):  
Raman Scattering ◽  
Co2 Laser ◽  
Growth Rates ◽  
Stimulated Raman Scattering ◽  
Temporal Behavior ◽  
Laser Produced Plasma ◽  
Stimulated Raman

Raman scattering

1986 ◽  
Vol 64 (8) ◽  
pp. 956-960 ◽  
Author(s):  
Albert Simon
Keyword(s):  
Raman Scattering ◽  
Alternative Explanation ◽  
Stimulated Raman Scattering ◽  
Scattered Light ◽  
Hot Electrons ◽  
Critical Surface ◽  
Laser Produced Plasma ◽  
Stimulated Raman

Observations of Raman scattered light from inhomogeneous laser-produced plasma have shown characteristics quite different from the simple predictions for the stimulated Raman scattering instability. An alternative explanation in terms of enhanced scattering, produced by bursts of hot electrons arising at the quarter-critical or critical surface, is described. Comparison is made between the predictions of this theory and four experiments.

scholarly journals Stimulated Raman scattering in plasmas produced by short intense laser pulses

1995 ◽  
Vol 13 (4) ◽  
pp. 525-537 ◽  
Author(s):  
H.C. Barr ◽  
T.J.M. Boyd ◽  
F.I. Gordon ◽  
S.J. Berwick
Keyword(s):  
Raman Scattering ◽  
Growth Rates ◽  
Stimulated Raman Scattering ◽  
Mode Conversion ◽  
Scattered Light ◽  
Laser Pulses ◽  
Laboratory Frame ◽  
Intense Laser ◽  
Strongly Coupled ◽  
Stimulated Raman

Stimulated Raman scattering driven by intense subpicosecond laser drivers is analyzed, in particular, the effects of the pulse shape and relativity on the instability and its characteristic spectra. The analysis is carried out in the pulse group velocity frame (Lorentz transformed) where growth rates for backscattering are decreased relative to their values when analyzed in the laboratory frame, while forward-scattered growth rates have greatly enhanced values. A range of intensities and densities is considered, appropriate to recent experiments, which ranges from strongly coupled scattering at high densities (even for forwardscattering) to stimulated Compton scattering regimes for backscattering and relativistically trapped forwardscattering at low densities. The inhomogeneities in intensity and density cause mode conversion between waves inside and outside the pulse. This can be at a modest level, as for backscattering, or extreme as in the case of forwardscattering when the Raman scattered light can be trapped within the laser pulse. The consequent feedback between modes within the pulse allows solutions, absolutely growing in the pulse frame, to be found.

scholarly journals TEMPORAL BEHAVIOR OF QUASI-STATIONARY STIMULATED RAMAN SCATTERING

1985 ◽  
Vol 34 (9) ◽  
pp. 1220
Author(s):  
MENG SHAO-XIAN ◽  
ZHANG WEI-QING ◽  
LIN LI-HUANG ◽  
LIN ZUN-QING ◽  
SHENG GUO-PING ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Stimulated Raman Scattering ◽  
Temporal Behavior ◽  
Stimulated Raman

The investigation of stimulated Raman scattering in laser produced plasma for heating wavelength 0.53 μm

1996 ◽  
Author(s):  
E. A. Bolkhovitinov ◽  
V. Y. Bychenkov ◽  
M. O. Koshevoi ◽  
M. V. Osipov ◽  
A. A. Rupasov ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Stimulated Raman Scattering ◽  
Laser Produced Plasma ◽  
Stimulated Raman

Kinetic theory of stimulated Raman scattering from a magnetized plasma

1985 ◽  
Vol 33 (2) ◽  
pp. 303-319 ◽  
Author(s):  
T. J. M. Boyd ◽  
R. Rankin
Keyword(s):  
Magnetic Fields ◽  
Raman Scattering ◽  
Growth Rates ◽  
Stimulated Raman Scattering ◽  
Magnetized Plasma ◽  
Larmor Radius ◽  
Good Growth ◽  
Strong Magnetic Fields ◽  
Bernstein Waves ◽  
Stimulated Raman

Finite Larmor radius corrections have been considered in the effects of strong magnetic fields on stimulated Raman scattering. A nonlinear dispersion relation describing the various channels of decay has been derived from the Vlasov-Maxwell equations and frequencies and growth rates determined for the decay of incident laser light in the extraordinary mode into scattered extraordinary mode radiation and electron Bernstein waves. A relativistic one-and-a-half dimensional particle code has been used to simulate the scattering process and the results from the numerical experiments have been compared with those obtained analytically, the agreement being generally good. Growth rates of the Bernstein waves are substantial when sufficiently strong magnetic fields are present in hot plasmas. Under these conditions the kinetic analysis shows that, in contrast to the predictions of fluid theory, the scattered light emitted from densities well below the quarter-critical layer can have a frequency less than ½ω0 where ω0 is the laser frequency. In an unmagnetized plasma this occurs only when the plasma has a finite temperature.

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