Observations of stimulated Brillouin and Raman effects in liquids and gases are reviewed. Additivity of the Brillouin shifts of mixtures of liquids is demonstrated. Optical mixing, the production of sum and difference frequencies by stimulated Brillouin emission, is shown, as is stimulated Rayleigh wing scattering, which is clearest with circularly polarized incident laser light, and with low-viscosity liquids. Stimulated thermal Rayleigh scattering has a threshold, is violet shifted about half the laser-line width, and requires a critical absorption coefficient in the scattering liquid.
DAVID H. RANK, "Some Stimulated Effects in Nonlinear Optics," J. Opt. Soc. Am. 60, 443-447 (1970)