Publications by authors named "Dmytro Sugak"

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

In situ investigation of coloration processes in LiNbO(3) : MgO during reducing/oxidizing high-temperature treatments.

Phys Chem Chem Phys 2009 May 10;11(17):3138-43. Epub 2009 Mar 10.

Institute of Materials, SRC, 202 Stryjska, Lviv, 79031, Ukraine.

The work presents experimental results of an in situ investigation of optical absorption of LiNbO(3) : MgO during reducing (95%Ar + 5%H(2)) and oxidizing (O(2)) high-temperature treatments in the temperature range from room temperature to 1073 K. The absorption spectra measured at in situ conditions at high temperatures in reducing/oxidizing atmospheres as well as the kinetics recorded at fixed wavelengths during rapid replacement of gas atmospheres have been analyzed. The origin of the changes in optical absorption caused by the reducing/oxidizing treatments is discussed in terms of hydrogen and oxygen ion diffusion and the point defect structure of the material.
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http://dx.doi.org/10.1039/b822631hDOI Listing
May 2009