A method to measure the Brillouin frequency shift of the medium through Brillouin amplification ratio

In order to measure the Brillouin frequency shift (BFS) of themedium, this paper proposes a method using mixtures in a two-cellstimulated Brillouin scattering system, which uses a medium to bemeasured as amplifier medium and a mixture medium as generatormedium. The seed light from the generator gains effectiveamplification in the amplifier and the amplification ratio changeswith the mixing fraction. Only when the BFS of the mixture medium isequal to that of the medium in the amplifier does the seed lightobtain the maximum amplification ratio. The method has the advantageof independence of the wavelength of the incident light.