Enhancement of stimulated Brillouin scattering in multiple resonance regions by two-color light in inhomogeneous flowing plasmas

Abstract

The effects of two-color light on stimulated Brillouin scattering (SBS) in an inhomogeneous flowing plasma have been investigated. The three-wave match of SBS is satisfied at multiple spatial locations and the multiple resonance regions occur when the two-color laser incident on an inhomogeneous flowing plasma, leading to multiple scattering of scattered light, which results in an enhancement of the reflectivity of the laser rather than a significant decrease. If the distance between the resonance points is smaller than the resonance length of SBS, the ion acoustic waves generated at different locations are coupled to each other, which enhances SBS. A model of multiple regions resonance of SBS is presented, and a one-dimensional Vlasov–Maxwell code is employed to verify the enhancement.