**4** Publications

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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.398428 | DOI Listing |

October 2020

Appl Opt 2017 Aug;56(22):6255-6262

A general method for determining the global maximum of the linear electro-optic effect in crystalline materials based on the construction and analysis of extreme surfaces obtained as a result of the optimization procedure is proposed. The electrically induced optical path length changes for ordinary and extraordinary waves as well as the optical path difference for orthogonally polarized waves were used as the objective functions in the optimization. The objective functions were determined for units of the electric field and crystal thickness in the light pass direction. In the example of LiNbO:MgO, it is shown that the maximal achievable given values of the optical path length change (global maxima) for ordinary and extraordinary waves are 119 pm/V and 277 pm/V, respectively. The global maximum of the optical path difference for orthogonally polarized waves is 269 pm/V (for 632.8 nm wavelength and at room temperature). These global maxima are exceeded by ∼1.5, 1.7, and 2.3 times the respective maximum values on direct cut crystals of LiNbO:MgO and are ∼5%, 9%, or 11% larger than the global maxima for undoped LiNbO crystal. This ensures a possibility to increase the energy efficiency by ∼2.9 or 5.3 times in the case of using of LiNbO:MgO crystals with optimal cuts as sensitive elements of electro-optic devices.

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http://dx.doi.org/10.1364/AO.56.006255 | DOI Listing |

August 2017

Appl Opt 2017 Mar;56(7):1839-1845

For the first time, the global maxima of the acousto-optic interaction are theoretically determined for biaxial SrB_{4}O_{7} crystals by the extreme surfaces method. As it is shown, the highest value of the acousto-optic figure-of-merit M_{2} is equal to 6.3×10^{-16} s^{3}/kg and achieved in the case of the isotropic diffraction of the electromagnetic wave propagating in the [010] direction on the fast quasi-transversal acoustic wave.

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http://dx.doi.org/10.1364/AO.56.001839 | DOI Listing |

March 2017

Nanoscale Res Lett 2016 Dec 27;11(1):107. Epub 2016 Feb 27.

Lviv Polytechnic National University, 12 Bandera Street, 79013, Lviv, Ukraine.

Mixed ferrites Sm0.5Pr0.5FeO3 and Sm0.5Nd0.5FeO3 with orthorhombic perovskite structure isotypic with GdFeO3 were synthesized by solid-state reaction technique in air at 1473 K. Structural parameters obtained at room temperature prove a formation of continuous solid solutions in the SmFeO3-PrFeO3 and SmFeO3-NdFeO3 pseudo-binary systems. Sm0.5Pr0.5FeO3 and Sm0.5Nd0.5FeO3 show strongly anisotropic nonlinear thermal expansion: thermal expansion in the b direction is twice lower than in the a and c directions. The average linear thermal expansion coefficients of Sm0.5Pr0.5FeO3 and Sm0.5Nd0.5FeO3 in the temperature range of 298-1173 K are in the limits of (9.0-11.1) × 10(-6) K(-1), which is close to the values reported for the parent RFeO3 compounds. Subtle anomalies in the lattice expansion of Sm0.5Pr0.5FeO3 and Sm0.5Nd0.5FeO3 detected at 650-750 K reflect magnetoelastic coupling at the magnetic ordering temperature T N.

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http://dx.doi.org/10.1186/s11671-016-1328-6 | DOI Listing |

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4769243 | PMC |

December 2016