N. M. Demyanyshyn

National Academy of Sciences of Ukraine | ISP

We explore piezooptic and photoelastic properties of Ca3Ga2Ge4O14 (CGG) crystals. A Mach–Zehnder interferometry technique is utilized to determine a complete set of the piezooptic tensor constants πim, with particular attention to the measurement accuracy, reliability, and uncertainty resolution in the piezooptic measurements. For these reasons, in...

All piezo-optic coefficients (POCs) and elasto-optic coefficients (ELOCs) of ${{\rm Ca}_3}{{\rm NbGa}_3}{{\rm Si}_2}{{\rm O}_{14}}$ C a 3 N b G a 3 S i 2 O 14 (CNGS) and ${{\rm Ca}_3}{{\rm TaGa}_3}{{\rm Si}_2}{{\rm O}_{14}}$ C a 3 T a G a 3 S i 2 O 14 (CTGS) trigonal crystals of the langasite group are determined from quantum mechanical calculation...

Based on the matrices of elastic and elasto-optic coefficients, the extreme surfaces of the spatial distribution of the acousto-optic (AO) figure-of-merit М2 for langasite and calcium-tantalum gallosilicate crystals are constructed and analyzed. The determined maximal achievable values of М2 for these crystals are commensurate and twice the maximal...

All possible experimental geometries of the piezo-optic effect in crystals of trigonal symmetry are studied in detail through the interferometric technique, and the corresponding expressions for the calculation of piezo-optic coefficients (POCs) πim and some sums of πim based on experimental data obtained from the samples of direct and Х/45°-cuts a...

The surfaces of the photoelasticity effects spatial distribution are constructed for langasite (LGS) and catangasite (CTGS) crystals basing on the matrices of piezo-optic and elastic-optic coefficients (POC and ELOC). It is shown that the maxima of the longitudinal piezo-optic effect (POE) are commensurate for both crystals and correspond to POC π3...

The photoelasticity of the ${{\rm Ca}_3}{{\rm TaGa}_3}{{\rm Si}_2}{{\rm O}_{14}}$ C a 3 T a G a 3 S i 2 O 14 (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 p...

We determine full matrices of piezo-optic and elasto-optic coefficients for lead germanate crystals, ${\rm Pb}_5{\rm Ge}_3{{\rm O}_{11}}$ P b 5 G e 3 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 ${\rm Pb}_5{\rm Ge}_3{{\rm O}_{11}}$ P...

Mach-Zehnder and conoscopic interferometry are used to explore photoelastic properties of anisotropic crystal materials. In a number of cases an application of both techniques significantly improves an accuracy of piezooptic and photoelastic measurements. The performance of such combined approach is demonstrated on tetragonal lithium tetraborate (L...

Mach-Zehnder and conoscopic interferometry are used to explore photoelastic properties of anisotropic crystal materials. In a number of cases an application of both techniques significantly improves an accuracy of piezooptic and photoelastic measurements. The performance of such combined approach is demonstrated on tetragonal lithium tetraborate (L...

The peculiarities of the acousto-optic interaction geometry optimization in the optically isotropic crystalline material are demonstrated on the example of GaP cubic crystal. The calculation algorithm takes into account the change of the optical indicatrix form during acoustic wave propagation through the crystal. On this basis, the highest achieva...

All the components of πim matrix of the piezo-optic coefficients of ammonium sulfate crystals are defined using the interferometric method based on the one-pass Mach-Zehnder interferometer. All components of the рin matrix of elasto-optic coefficients are calculated on the basis of the πim matrix and elastic stiffness coefficients Сmn. Ammonium sul...

Relative changes in the Young modulus caused by cyclic loads, which are by an order of magnitude lower than the yield strength, have been studied on D16 alloy specimens (international analog: 2024 alloy), which correspond to the model of a thin round plate rigidly clamped along the contour. It is shown that the parameter δE/ E is very sensitive (ch...

Complete matrices of piezo-optic and elasto-optic tensors are experimentally determined for Tl 3 As S 4 crystals. It is revealed that the piezo-optic coefficients are very high, ∼ 10 − 11 N / m 2 in the order of magnitude. This implies that Tl 3 As S 4 can be referred to the best piezo-optic materials. The same concerns the elasto-optic coefficient...

The global maxima of the acousto-optic interaction are theoretically determined for CaWO4 crystals by extreme surfaces method. As it is shown, the highest value of the acousto-optic figure of merit M2 is equal to 14.0 × 10⁻¹⁵ s³/kg and achieved in the case of the di raction of ordinary or extraordinary light beam on the slow quasi-transversal acous...

For the first time, to the best of our knowledge, we have experimentally determined all of the components of the piezo-optic tensor for monoclinic crystals. This has been implemented on a specific example of triglycine sulfate crystals. Based on the results obtained, the complete elasto-optic tensor has been calculated. Acousto-optic figures of mer...

The peculiarities of photoelastic and acousto-optic effects are first tested in chalcohalide 65GeS2-25Ga2S3-10CsCl glass exploring the interferometry method. The determined piezo-optic coefficients occur to be (in Br) π 11 =2.8±0.6, π 12 =6.0±0.9 and π 44 =-3.2±1.1. In respect to maximal acousto-optic figure of merit M 2 =55.6·10⁻¹⁵ s³/kg proper fo...

We have determined ten piezooptic tensor components for monoclinic triglycine sulfate crystals, using an interferometric method. Acoustooptic figure of merit has been calculated for the case of isotropic acoustooptic interactions with a quasi-longitudinal acoustic wave.

A general equation describing the rotation of an optical indicatrix of tetragonal crystals (4, 4 ¯ , 4 / m symmetry classes) around the X 3 axis (optical axis) depending on the direction of uniaxial pressure in the plane perpendicular to crystal optical axis is written. Partial cases of the general equation, when pressure is acting along the X 1 (...

Piezo-optical and elasto-optical properties of lead molibdate (PbMoO4) crystals are investigated, as determined by the quantum-mechanical ab initio calculation of the full set of elasto-optic, piezo-optic and elastic tensor components. Indicative surfaces are built, which describe the anisotropy of these stress- and strain-optical effects and allow...

The information technology for most efficient and stable application of bulk and nanocrys-talline materials as sensitive elements for electro-, acousto-optic and nonlinear optical cells has been developed and approved. It is based on 3D-analysis of spatial anisotropy for appropriate induced optical effects. Our approach has been checked on example...

The spectral, elasto- and acoustooptical properties of calcium tungstate are investigated. It is shown that the maximal value of M2 for shearing waves is more than two times higher than for the longitudinal ones.

The optimal geometries of the piezo-optic interaction are determined for SrB4O7 crystals by the extreme surfaces method. The goal functions of optimization are the change of optical path length and optical path difference, normalized on mechanical stress and crystal thickness, and the parameters of optimization are the spherical angles determining...

Elasto-optic coefficients of gallium phosphide (GaP) crystals were calculated on the basis of their piezo-optic and elastic coefficients. Surfaces of the spatial distribution of piezo- and elasto-optic effects in these crystals were built. The maxima of the surfaces of the elasto-optic effect and the geometries of acousto-optic interaction that cor...

For CaWO4 calcium-tungstate crystals based of piezooptic π im and elastic C mn coefficients, we fill the matrix of elastooptic constants p in and compute the errors of their determination. We reveal the following empirical regularity: the signs of piezo- and elastooptic coefficients with identical subscripts coincide. It is shown that this law rema...

Ukrainian Journal of Physical Optics Volume 14, Issue 3, 2013, Pages 101-118

Materials Science Volume 45, Issue 3, May 2009, Pages 417-423

Ukrainian Journal of Physics Volume 60, Issue 3, 2015, Pages 273-276H.V. Karpenko Physico-Mechanical Institute, Nat. Acad. Of Sci. Of Ukraine, 5, Naukova Str, Ukraine © Copyright 2015 Elsevier B.V., All rights reserved.

[Show abstract] Crystallography Reports 07/2006; 51(4):653-660. DOI:10.1134/S1063774506040195 · 0.49 Impact Factor

Article: Piezo-optic surfaces of lithium niobate crystals B. G. Mytsyk, N. M. Dem'yanyshyn [Show abstract] Crystallography Reports 07/2006; 51(4):653-660. DOI:10.1134/S1063774506040195 · 0.49 Impact Factor Request full-text Article: Relaxation of Piezobirefringence in Triglycine Sulfate Crystals N. M. Dem'yanishin, B. G. Mytsyk [Show abstract] Phy...

The anisotropy of piezo- and elasto-optic effects in calcium tungstate CaWO 4 crystals was studied by the indicatory surfaces method. On the basis of the maximum surfaces of the elasto-optic effect, the geometry of acousto-optic interaction with maximum efficiency was found.

Conoscopic method for piezo-optic effect study in optically uniaxial crystals related to 4, , 4/m symmetry class was described. Ratio for determination of difference between principal piezo-optic coefficients π11–π12 and rotating coefficient π61 on the basis of change of the angle between optical axes and optical indicatrix rotation under uniaxial...

All components of the piezo-optic coefficient matrix of calcium tungstate crystals, belonging to the 4/m symmetry class, are determined. The reliability of the piezo-optic effect measurements in CaWO4 crystals is achieved by determining each piezo-optic coefficient from several experimental geometries and is also based on the correlation of the abs...

The elastic hysteresis and residual deflection of the aluminum D16 alloy samples corresponding to the model of a circular plate clamped along its perimeter have been studied at low (the beginning of the Hooke region) mechanical stresses. It has been shown that these characteristics depend substantially (change several times) on the sample state pro...

The anisotropy of piezo- and elasto-optic effects in strontium borate crystals was studied by the indicative surfaces method. The geometry of acousto-optic interaction with maximum efficiency was found on the basis of the surface maxima of the elasto-optic effect.

The relaxation of the static photoelasticity in triglycine fluoroberyllate crystals has been studied. The anisotropy of the relaxation amplitudes and their anomalies near the phase transition have been revealed. The photoelastic relaxations and peculiarities of their temperature behavior have been explained in terms of the piezocaloric mechanism.

We have derived analytical relations necessary for interpreting piezooptic effect and calculation of all piezooptic coefficients on the basis of interferometric technique, which take a micro-wedge shape of samples into consideration. The analysis is presented for the tetragonal crystals of point symmetry classes 4, ‾4 and 4/m. The relations valid f...

On the basis of studies of the piezo-optic effect, it has been shown that SrB(4)O(7) crystals can be used as efficient acousto-optic materials in the vacuum ultraviolet spectral range. The full matrices of piezo-optic and photoelastic coefficients have been experimentally obtained for these crystals. The acousto-optic figure of merit and the diffra...

Paper reports the piezooptical studies on langasit La3Ga5SiO14 (LGS) and calcium tungstate CaWO4 (CWO) crystals by means of the combined optical interferometry and polarization-optical techniques. Corresponding methodology is supplied by a set of derived equations suitable for the determination of the absolute piezooptical coefficients (POCs) in th...

A procedure is proposed for the construction [with high accuracy (∼ 0.02%)] of the stress–strain diagrams for specimens corresponding to a model of restrained circular plate. On the basis of these diagrams for 40Kh steel, it is shown that the phenomenon of hysteresis, the nonlinearity of the dependence of the amplitude of hysteresis on the mechanic...

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 w...

Specific features of constructing indicatory surfaces of the electro-optic effect (EOE) are described. The generalized case for the symmetry class 3m and all three possible indicatory surfaces under orthogonal experimental conditions, when the directions of light propagation and electric field are orthogonal, is considered. The EOE surfaces are con...

The electro-optic (EO) properties of pure and MgO-doped LiNbO3 crystals are characterized by indicative surfaces (IS) describing the spatial anisotropy of the longitudinal and transverse linear EO effects. By analyzing the IS and their stereographic projections, we have determined the geometries with maximum EO coupling. The maximum magnitudes of t...

The paper presents a technique suitable for the determination of linear electro-optic effect (LEOE) tensor components in crystal materials of any symmetry. The method is based on the Michelson interferometer, where the sample being studied is set into one of its arms to measure the electro-induced changes of the optical path. We describe in detail...

In this paper new approach to the spatial anisotropy 3D-analysis of electro- and acousto-optical effects on the basis of indicative surfaces for different components of tensor describing these effects has been proposed and the optimization technique for such interactions of light with electrical field or acoustical wave in the crystalline materials...

Method for definition of absolute piezo-optic coefficients (POC) for crystals of 3m and 32 symmetry from polarized-optic measurements of piezo-optic coefficients of retardation is described. On the basis of filled POC matrix of langasite crystals elasto-optic coefficients are calculated and indicative surfaces of elastooptic effect for these crysta...

A new approach during design of most efficient electro- and acousto-optic cells for modern fiberoptic infocommunication systems is offered. It is based on spatial anisotropy 3D-analysis of electro-, piezo- and acousto-optic effects in crystalline materials as working elements for such cells. The corresponding approach is demonstrated for researched...

The electro-optic (EO) properties of pure and MgO-doped LiNbO3 crystals are characterized by indicative surfaces (IS) describing the spatial anisotropy of the longitudinal and transverse linear EO effects. By analyzing the IS and their stereographic projections we have determined the geometries with maximum EO coupling. The maximum magnitudes of th...

The electro-optic (EO) properties of pure and MgO-doped LiNbO3 crystals are characterized by indicative surfaces (IS) describing the spatial anisotropy of the longitudinal and transverse linear EO effects. By analyzing the IS and their stereographic projections we have determined the geometries with maximum EO coupling. The maximum magnitudes of th...

In this paper new approach to the spatial anisotropy analysis of piezo-, elasto- and acousto-optical effects on the basis of indicative surfaces for different components of tensor describing these effects has been proposed and the optimization technique for such interactions of light with mechanical field or acoustical wave in the anisotropic mater...

A method of construction of the spatial distribution of the piezo-optic effect in crystals is proposed. A particular case of this method is the known technique of construction of indicator surfaces of the piezo-optic effect. The essence of the proposed method consists in determining the difference in the radius vectors of the optical indicatrix per...

We present a method of construction of piezo-optical surfaces (POS) which consists in the finding of the difference of position vectors of the optical indicatrix perturbed by a mechanical stress and a nonperturbed one. It is proved that the method of construction of the indicative surfaces (IS) of the longitudinal and transversal piezo-optical effe...

The effect of photoelastic relaxation is investigated using triglycine sulfate ferroelectric crystals as an example. The optical and deformation contributions to the photoelastic relaxation are described, and their percentage in the combined effect is determined. Consideration is given to the temperature dependences of the relaxation amplitudes of...

PIEZO-OPTICAL RELAXATION IN FERROELECTRIC CRYSTALS OF DEUTERATED TRIGLYCINE SELENATE B. G. Mytsyk, B. I. Hnatyk, N. M. Demyanyshyn Lviv Center of Institute of Space Research, Nat. Acad. Sci. of Ukraine and Nat. Space Agency of Ukraine (5a, Naukova Str., Lviv 79000, Ukraine) S u m m a r y In the crystals of deuterated triglicine selenate, the effect...

The phenomenological description of photoelastic relaxations using the piezocaloric interpretation especially for ferroelectric crystal is proposed. The experimental results for Rochelle Salt crystals confirming this interpretation are given.

The relaxation of static photoelasticity in triglycine sulfate (TGS) crystals is investigated. The relaxing amplitudes are quite anisotropic, including changes in sign, and exhibit temperature anomalies. A mechanism is proposed for photoelastic relaxation and its temperature anomalies based on the piezocaloric effect. The corresponding calculations...

The photoelastic relaxation in ferroelectric crystals of threeglicyn selenate are investigated. The thermal anomalies of relaxation amplitudes are studied. The relative relaxation amplitudes beta_{km} have a large anisotropy and lie in the value range from -5% to +13% at T=16°C and from +16% to +90% at the phase transition region. The results depen...

In this work the results of temperature researches of piezooptic constants, describing changes of path difference, and relaxation of piezooptic effect for TGS + Cr crystals are presented. The anomalies in the field of phase transition are explained and designed. The features of photoelasticity relaxations are analysed. It is specified that the anom...

The relaxation of statistic photoelasticity of the anisotropic substrate have been measured for the first time. Examples for the crystals of TGS+Cr3+ are given. The mechanism of different sign relaxation and found on the initial phase of relaxation dependencies anomalies are discussed. The amplitudes and times of the elastic postaction must be take...

Brief consideration of new technical solutions for polarization optical transducers of quasi- static pressure proposed by the authors is presented hereafter. The advantages of MULTIMODE registration compared with ONEMODE registration were indicated. Several options of calculation of MULTIMODE polarization-optical compensators for precise pressure m...

The surfaces of the piezooptic effect and their stereographic projections for potash alum and barium fluoride crystals are constructed. The extreme values of the piezooptic effect are determined and their angular directions are indicated for the above crystals. The three-dimensional distribution of the piezooptic effect in cubic crystals is discuss...