Abstract
We report the observation of phase conjugation by self-pumped four-wave mixing in CS2 using a low-power fixed-Q Nd: YAG laser. The four-wave mixing makes use of the Brillouin nonlinearity, and this causes the conjugate beam to have a characteristic double Brillouin shift. At threshold, the product of the intensity multiplied by the interaction length is significantly less than that observed in conventional Brillouin scattering.