Determination of the parameters of a nonlinear response of liquids in an acoustic resonance region by the method of nondegenerate four-wave interaction

The method of nonlinear four-wave interaction spectroscopy was used to record the spectra of acoustic resonances of seven liquids active in stimulated Brillouin scattering (STBS) at frequencies corresponding to the backscattering of laser radiation in neodymium glass. These measurements made it possible to determine in the same experiment the STBS gain and the decay time and velocity of propagation of hypersound in the liquids.