On the theory of the SBS linewidth in a two ion-species plasma

The dependence of the SBS linewidth in a carbon-hydrogen plasma on the plasma parameters and the pump field intensity is studied. It is shown that the threshold and spectral composition of SBS can be varied by changing the concentration of carbon and the degree of nonisothermicity of the plasma. The physical nature of these variations is associated with variations in the attenuation and spectrum of the ion-sound waves whose pumping leads to the development of parametric instability.