Intensity saturation of stimulated Raman scattering by ion-wave coupling

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

DOI:https://doi.org/10.1063/1.865878· OSTI ID:5933655

Heikkinen, J A; Karttunen, S J

Nonlinear saturation of stimulated Raman scattering caused by ion-wave coupling is investigated analytically and numerically. Various linear damping conditions for plasmons and ion-acoustic waves are included in the analysis. The main results can be summarized in terms of the normalized damping coefficient ..beta.. (..beta.. = Raman gain length/plasmon absorption length), which decreases with the laser intensity I as ..beta..approx.I/sup -1//sup ///sup 2/. At low intensities (..beta..>4) the Raman reflectivity increases according to the well-known three-wave process. At high intensities (0.2<..beta..<2) a steady state still exists and the reflectivity is saturated as a function of the laser intensity. At very high intensities (..beta..<0.1) temporally spiky and chaotic reflectivity is obtained. The reflectivities remain at very low levels, except for large interaction lengths.

• Research Organization: Technical Research Centre of Finland, Nuclear Engineering Laboratory, P.O. Box 169, SF-00180 Helsinki 18, Finland
• OSTI ID: 5933655
• Journal Information: Phys. Fluids; (United States), Journal Name: Phys. Fluids; (United States) Vol. 29:4; ISSN PFLDA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700108* -- Fusion Energy-- Plasma Research-- Wave Phenomena
ANALYTICAL SOLUTION
AUGMENTATION
COHERENT SCATTERING
COUPLING
DAMPING
ION ACOUSTIC WAVES
ION WAVES
LASER-PRODUCED PLASMA
NONLINEAR PROBLEMS
NUMERICAL SOLUTION
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
PLASMA
PLASMA WAVES
PLASMONS
QUASI PARTICLES
RAMAN EFFECT
RANDOMNESS
REFLECTIVITY
SATURATION
SCATTERING
STEADY-STATE CONDITIONS
SURFACE PROPERTIES