Phase conjugate reflectivity scaling by four wave stimulated Brillouin scattering (FWSBS) was investigated experimentally and compared to analytic expressions for the reflectivity in the weak probe and saturated pump regimes. Experiments were performed in acetone near 1.06 Lin to study the dependence of reflectivity on probe beam intensity, forward pump beam intensity and the ratio of forward to backward pump beam intensity. We observed reflectivities as high as 1000x and efficiencies as high as 16%,. We found good agreement with simple theoretical predictions by Shih1 for reflectivity and efficiency.
"Reflectivity Scaling In Four Wave Stimulated Brillouin Scattering", Proc. SPIE 0739, Phase Conjugation, Beam Combining, and Diagnostics, (22 April 1988); doi: 10.1117/12.939700; https://doi.org/10.1117/12.939700