Brillouin spectroscopy is an optical technique that allows one to determine the directional dependence of acoustic velocities in minerals and materials subject to a wide range of environmental conditions. It is based on the inelastic scattering of light by spontaneous collective motions of particles in a material in the frequency range between 10−2 to 10 GHz.
Brillouin spectroscopy is used to determine acoustic velocities and elastic properties of a number of crystalline solids, glasses, and liquids. It is most commonly performed on transparent single crystals where the complete elastic tensor of the sample material can be derived. However, Brillouin...
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