Suppression of stimulated Raman scattering of a laser in a rippled density plasma

Journal Article · Fri Feb 15 04:00:00 EST 2008 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.2836622· OSTI ID:21103807

Pathak, Vishwa Bandhu; Tripathi, V K ^[1]

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1. Physics Department, IIT, Delhi-110016 (India)

The effect of a stationary electron density ripple on stimulated Raman scattering (SRS) of a laser in a plasma is studied. The density ripple couples with the primary Langmuir wave, generated in the Raman process, to produce a secondary Langmuir wave of larger wave number that is strongly Landau damped on the electrons. As a consequence, the growth rate of the Raman process is suppressed. In a special case of density ripple produced by two counterpropagating lasers of intensity {approx}10{sup 15} W/cm{sup 2} at 1 {mu}m wavelength in a 6% critical density plasma of 1 keV temperature, the reduction in growth rate is substantial. The effect of density ripple wavelength on SRS is studied at different plasma temperatures. Up to {approx}70% suppression in SRS is observed for different plasma temperatures at different ripple wavelengths. However, for higher temperatures we also get {approx}10% of suppression for the other ripple wavelength values.

• OSTI ID: 21103807
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 2 Vol. 15; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ELECTRON DENSITY
ELECTRON TEMPERATURE
ELECTRONS
ION TEMPERATURE
LASERS
PLASMA
PLASMA DENSITY
RAMAN EFFECT
WAVELENGTHS