Abstract
Both analytical and numerical analysis of weakly coupled backward stimulated Raman scattering (BSRS) of a modulated laser pulse in an underdense plasma is made. In that regime the spectrum of a backscattered field contains only the usual Stokes lines from respective spectral components of a laser pulse, each narrow compared to (omega) <SUB>pe</SUB>. Additionally, the intensity of radiation, backscattered from a given spectral component of a laser pulse, dramatically lowers in appearing in the pulse spectrum of another component, red-shifted by 2(omega) <SUB>pe</SUB> with respect to the former. It is proved that a long-wavelength plasma wave with a relativistic phase velocity, propagating in plasma, affects the mode structure of weakly coupled BSRS. It is shown via direct numerical modeling that the strong pulse modulation visibly modifies the spectrum of strongly coupled BSRS. The linear theory clarifies some details of numerically modeled evolution of BSRS spectra due to nonlinear pulse evolution.
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