Publications by authors named "Nataliya Demyanyshyn"

2 Publications

  • Page 1 of 1

Full set of piezo-optic and elasto-optic coefficients of CaTaGaSiO crystals at room temperature.

Appl Opt 2020 Oct;59(28):8951-8958

The photoelasticity of the (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 of the elastic-optic matrix are calculated. For the highest coefficient, the acousto-optic efficiency is evaluated. The results obtained for CTGS are compared with the corresponding results for (langasite) crystals. The highest acousto-optic figure of merit of CTGS =1.66⋅10/ 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.
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http://dx.doi.org/10.1364/AO.398428DOI Listing
October 2020

Piezo-optic coefficients of MgO-doped LiNbO3 crystals.

Appl Opt 2009 Apr;48(10):1904-11

Karpenko Physico-Mechanical Institute, 5 Naukova Street, 79601 Lviv, Ukraine.

We describe an interferometric technique suitable for determination of piezo-optic coefficients (POCs) in crystals. The method considers real nonparallelism of measured samples, thereby improving the measuring precision of POCs significantly. Corresponding equations are derived for the interferometric half-wave stress method. Using this technique we have determined a complete set of POCs of pure and MgO-doped LiNbO(3) crystals. The reliability of the data has been confirmed by comparing the effective POCs expressed through the combinations of measured POCs and the effective POCs determined independently using highly precise optical birefringence measurements. Pure and MgO-doped LiNbO(3) crystals reveal nearly the same magnitudes of POCs. However, LiNbO(3):MgO exhibits about 4 times higher resistance with respect to powerful light radiation, making it more suitable for application in acousto-optic devices that deal with superpowerful laser radiation.
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http://dx.doi.org/10.1364/ao.48.001904DOI Listing
April 2009