Trajectories of Trapped Particles in the Field of a Plasma Wave Excited by a Stimulated Raman Scattering

1993 ◽  
Vol 108 (2) ◽  
pp. 373-376 ◽  
Author(s):  
A. Ghizzo ◽  
M. Shoucri ◽  
P. Bertrand ◽  
T. Johnston ◽  
J. Lebas
Keyword(s):  
Raman Scattering ◽  
Plasma Wave ◽  
Stimulated Raman Scattering ◽  
Trapped Particles ◽  
Stimulated Raman

Suppression of stimulated Raman scattering at ultra relativistic laser power: Effect of localization

2010 ◽  
Vol 77 (3) ◽  
pp. 293-306
Author(s):  
RUCHIKA GUPTA ◽  
PRERANA SHARMA ◽  
R. P. SHARMA ◽  
M. RAFAT
Keyword(s):  
Raman Scattering ◽  
Laser Beam ◽  
Plasma Wave ◽  
Stimulated Raman Scattering ◽  
Power Laser ◽  
Plasma Parameters ◽  
Power Flux ◽  
Electron Plasma Wave ◽  
Power Effect ◽  
Stimulated Raman

AbstractThe filamentation of the high-power laser beam is investigated by taking off axial contribution when relativistic nonlinearity is considered. The effect of filamentation of the laser beam is studied on the localization of the electron plasma wave (EPW) and on the stimulated Raman scattering (SRS). The semi-analytical solution of the nonlinearly coupled EPW equation in the presence of laser beam filaments has been found. It is observed that due to this nonlinear coupling between two waves, localization of EPW takes place. This localization of EPW affects the Eigen frequency and damping of plasma wave. The new enhanced damping of the plasma wave has been calculated and it is found that the SRS process gets suppressed due to the localization of plasma wave in laser beam filamentary structures. For typical laser beam and plasma parameters with wavelength λ (=1064 nm), power flux (=1018 W cm−2) and plasma density n/ncr (=0.2); the SRS back reflectivity is found to be suppressed by a factor of approximately 8%.

scholarly journals Stimulated Raman scattering of ultra intense hollow Gaussian beam in relativistic plasma

2015 ◽  
Vol 33 (3) ◽  
pp. 489-498 ◽  
Author(s):  
Prerana Sharma
Keyword(s):  
Raman Scattering ◽  
Laser Beam ◽  
Gaussian Beam ◽  
Plasma Wave ◽  
Stimulated Raman Scattering ◽  
Collisionless Plasma ◽  
Vital Role ◽  
Higher Order ◽  
Gaussian Laser Beam ◽  
Stimulated Raman

AbstractEffect of relativistic nonlinearity on stimulated Raman scattering (SRS) of laser beam propagating carrying null intensity in center [hollow Gaussian beam (HGB)] is studied in collisionless plasma. The construction of the equations is done employing the fluid theory which is developed with partial differential equation and Maxwell's equations. The phenomenon of SRS is shown along with the excitation of seed plasma wave considering relativistic nonlinearity. The power of plasma wave is observed for higher order of HGB. The Raman back reflectivity is studied numerically for various orders of hollow Gaussian laser beam (HGLB) and the numerical analysis shows that these parameters play vital role on reflectivity characteristics. It is observed that the Raman back reflectivity is less for the higher order of HGLB.

scholarly journals Fluid modeling of stimulated Raman scattering accounting for trapped particles benchmarked against fully kinetic simulations

2020 ◽  
Vol 27 (12) ◽  
pp. 122707
Author(s):  
G. Tran ◽  
P. Loiseau ◽  
A. Fusaro ◽  
A. Héron ◽  
S. Hüller ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Stimulated Raman Scattering ◽  
Trapped Particles ◽  
Fluid Modeling ◽  
Stimulated Raman

scholarly journals Stimulated Raman backscattering of filamented hollow Gaussian beams

2013 ◽  
Vol 31 (3) ◽  
pp. 387-394 ◽  
Author(s):  
Ram Kishor Singh ◽  
R.P. Sharma
Keyword(s):  
Raman Scattering ◽  
Gaussian Beam ◽  
Plasma Wave ◽  
Stimulated Raman Scattering ◽  
Collisionless Plasma ◽  
Electron Plasma ◽  
Electron Plasma Wave ◽  
Self Focusing ◽  
Paraxial Ray ◽  
Stimulated Raman

AbstractThis paper presents a model for excitation of electron plasma wave and resulting stimulated Raman scattering due to presence of a laser beam carrying null intensity in center (hollow Gaussian beam) in a collisionless plasma. We have studied the self-focusing of the hollow Gaussian beam and its effect on back stimulated Raman scattering process in the presence of ponderomotive nonlinearity. To understand the nature of propagation of the hollow Gaussian beam, electron plasma wave and back reflectivity, a paraxial-ray approximation has been invoked. It is predicted that self-focusing and back reflectivity reduces for higher order of hollow Gaussian beam.

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