Influences of sinusoidal density modulation on stimulated Raman scattering in inhomogeneous plasmas

Abstract The influence of sinusoidal density modulation on stimulated Raman scattering (SRS) reflectivity in inhomogeneous plasmas is studied using three-wave coupling equations, fully kinetic Vlasov simulations, and particle-in-cell (PIC) simulations. Through a numerical solution the we find that capable inducing absolute SRS even though Rosenbluth gain smaller than π , describe region modulational wavelength amplitude which can be induced, agrees with earlier studies. average obtained by simulations has same trend as growth rate from equations. Instead causing instability, shorter basic length suppress inflation through harmonic waves. In addition, PIC qualitatively agree our Our results offer an alternative explanation for high experimental underdense plasmas, due to long-wavelength modulation, potential method short-wavelength modulation.