Reflection limitation by driven stimulated Brillouin rescattering and finite-bandwidth spectral interaction

Driven stimulated Brillouin rescattering, obtained by a multiline laser light, each satellite line downshifted by twice the acoustic frequency, is an efficient way to reduce stimulated Brillouin reflection [C. Montes, Phys. Rev. Lett. 50, 1129 (1983)]. An explicit reflection formula for two input lines depleting in a finite, homogeneous plasma slab---in the heavy ion-damping limit---is obtained which generalizes Tang's formula for one single input line. Finite spectral interaction of narrow input lines with broad backscattered spectra are considered by solving numerically the nonlinear integro-differential ion-Compton equations. The results are compared to those obtained by a single wide-bandwidth input spectrum.