Abstract
The elasto-optic tensor elements p12 and p44 of glasses in the series BaO–B2O3, PbO–B2O3, BaO–P2O5, PbO–P2O5, and PbO–SiO2 were measured using Brillouin spectroscopy. Densities, refractive indices, and elastic moduli were also determined. A model was also developed for the elasto-optic tensor elements based on a bond-polarizability approach, which was validated using first-principles calculations and then used to explain the compositional trends observed in the elasto-optic tensor elements. It was found that the shear elasto-optic element p44 could be explained in terms of the average bond polarizability anisotropy, while the dilation response p11 + 2p12 involved also the bulk cell polarizability response to volume changes.
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