Measurement of the Rotational Contribution to Brillouin Scattering

Abstract

The first measurement of light scattering from rotations, as contrasted to strains, is reported in solids. Brillouin-scattering cross sections in rutile, previously expected to be equal in intensity, were found to differ by ∼${10}^3$. The difference between the deduced photoelastic coefficients confirms quantitatively the recent prediction of this effect.