Abstract
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 ∼1015W∕cm2 at 1μm wavelength in a 6% critical density plasma of 1keV temperature, the reduction in growth rate is substantial. The effect of density ripple wavelength on SRS is studied at different plasma temperatures. Up to ∼70% suppression in SRS is observed for different plasma temperatures at different ripple wavelengths. However, for higher temperatures we also get ∼10% of suppression for the other ripple wavelength values.
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