Abstract

The photoelasticity of the ${{\rm Ca}_3}{{\rm TaGa}_3}{{\rm Si}_2}{{\rm O}_{14}}$ (CTGS) crystal was studied by an interferometric method based on a single-pass Mach-Zehnder interferometer. The maximum number of sample orientations for the piezo-optic experiments was applied to prove accuracy in the determination of the piezo-optic coefficients. Based on the matrices of the piezo-optic coefficients and the elastic stiffness coefficients, all the coefficients ${p_{\textit{ik}}}$ of the elastic-optic matrix are calculated. For the highest ${p_{\textit{ik}}}$ coefficient, the acousto-optic efficiency is evaluated. The results obtained for CTGS are compared with the corresponding results for ${{\rm La}_3}{{\rm Ga}_5}{{\rm SiO}_{14}}$ (langasite) crystals. The highest acousto-optic figure of merit of CTGS ${M_2} = {1.66}\cdot{{10}^{- 15}}\;{{\rm s}^3}/{\rm kg}$ is two and three times higher, compared with langasite and strontium borate, respectively, which are often used for acousto-optic modulation of light in the ultraviolet spectral range.

© 2020 Optical Society of America

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