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Experimental determination of full matrices of the piezo-optic and elasto-optic coefficients for Pb5Ge3O11 crystals

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Abstract

We determine full matrices of piezo-optic and elasto-optic coefficients for lead germanate crystals, ${\rm Pb}_5{\rm Ge}_3{{\rm O}_{11}}$, using Dixon–Cohen and interferometric methods. Two different types of samples are studied, single- and multi-domain. We show that the correct data for the ${\rm Pb}_5{\rm Ge}_3{{\rm O}_{11}}$ crystals can be obtained only with single-domain samples, since the domain structure induces a number of features that make the final results unreliable. We demonstrate that the acousto-optic figures of merit reach high-enough values at the isotropic acousto-optic interactions with longitudinal acoustic waves propagating along the principal $ x $ and $ z $ axes ($63 \times {10^{-15}}$ and $37 \times {10^{-15}}\;{{\rm s}^3}/{\rm kg}$), respectively. At the same time, the efficiency of the acousto-optic interactions with transverse acoustic waves is low. The same is true concerning anisotropic acousto-optic diffraction, since the appropriate elasto-optic coefficients are small enough.

© 2020 Optical Society of America

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