Spatial Anisotropy of Photoelasticity Determined by Path Difference in Ba3TaGa3Si2O14 Crystals
Source abstract
Abstract
The elastic and photoelastic coefficients of Ba3TaGa3Si2O14 (BTGS) crystals were determined by the quantum–mechanical calculation technique. Based on these data, extreme piezo-optic surfaces π′°km were constructed, which describe the change in the path difference in light beams in the crystal under the influence of mechanical stress. The results for BTGS crystals are compared with the ones for other crystals of the langasite group (La3Ga5SiO14, Ca3Ga2Ge4O14, Ca3TaGa3Si2O14 and Ca3NbGa3Si2O14). The global maxima of the π′°km surfaces for BTGS crystals significantly exceed the ones for the other crystals mentioned above and, accordingly, BTGS crystals can be suitable for use in polarization-optic light modulators and devices based on them. The acousto-optic efficiency of BTGS crystals was evaluated. The correlations between the magnitude of the piezo- and elasto-optic coefficients and the parameters of the unit cell of the studied crystals were determined.
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Research context
OpenAlex topics: Optical and Acousto-Optic Technologies · Acoustic Wave Resonator Technologies · Ultrasonics and Acoustic Wave Propagation
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Karpenko Physico-Mechanical Institute, 5 Naukova St., 79601 Lviv, Ukraine
Lviv Polytechnic National University, 12 Bandery St., 79046 Lviv, Ukraine
Funding
the Ministry of Education and Science of Ukraine · European Union
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