Study of piezo-optic effect of calcium tungstate crystals by the conoscopic method

Mytsyk, B. G.; Kost, Ya.; Demyanyshyn, N. M.; Gaba, V. M.; Sakharuk, О. М.

doi:10.1016/j.optmat.2014.10.066

Cited by 17 publications

(9 citation statements)

References 8 publications

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“…Furthermore, the interferometric method is known to provide a somewhat poor description of so-called rotating piezo-optical constants (those which correspond to a rotation of the optical indicatrix under mechanical stress); a conoscopic method has recently been devised to determine such constants more accurately. 19 In this paper we present a general, fully automated scheme for the theoretical ab initio calculation of the fourth-rank piezo-optic tensor ⇡ of crystals belonging to any space group symmetry, which requires the simultaneous determination of the elastic sti↵ness and compliance tensors and of the photoelastic tensor. The scheme adopts periodic-boundary conditions, fully exploits both point and translational symmetries at all steps, [20][21][22][23] is based on the evaluation of analytical energy gradients with respect to both atomic coordinates and lattice parameters [24][25][26][27] and utilizes the analytical CoupledPerturbed-Hartree-Fock/Kohn-Sham (CPHF/KS) method to compute static and electric field frequency-dependent optical (i.e., dielectric) properties of crystals.…”

Section: Introductionmentioning

confidence: 99%

“…This is a promising material for acoustooptic modulators and its full set of piezo-optic (and photoelastic) constants has been experimentally determined only quite recently. 13,[17][18][19] An explicit investigation is performed on the e↵ect of adopting several functionals of density functional theory (DFT) belonging to three rungs of the so-called "Jacob's ladder" 39 (namely, a local-density approximation, a generalized-gradient approximation, and a couple of global hybrids), and on the electric field frequency-dependence of all computed dielectric, piezo-optic, and photo-elastic properties. Our calculations allow us to confirm the experimentally measured values of a sub-set of the 10 independent piezo-optic and photo-elastic constants of CaWO 4 and, on the contrary, to point-out large discrepancies in the determination of the others and to provide a complete description of the anisotropic stressoptical response of this crystal.…”

Section: Introductionmentioning

confidence: 99%

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Piezo-optic tensor of crystals from quantum-mechanical calculations

Erba

Ruggiero

Korter

et al. 2015

The Journal of Chemical Physics

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An automated computational strategy is devised for the ab initio determination of the full fourth-rank piezo-optic tensor of crystals belonging to any space group of symmetry. Elastic sti↵ness and compliance constants are obtained as numerical first derivatives of analytical energy gradients with respect to the strain and photo-elastic constants as numerical derivatives of analytical dielectric tensor components, which are in turn computed through a Coupled-Perturbed-Hartree-Fock/Kohn-Sham approach, with respect to the strain. Both point and translation symmetries are exploited at all steps of the calculation, within the framework of periodic boundary conditions. The scheme is applied to the determination of the full set of ten symmetry-independent piezo-optic constants of calcium tungstate CaWO 4 , which have recently been experimentally reconstructed. Present calculations unambiguously determine the absolute sign (positive) of the ⇡ 61 constant, confirm the reliability of 6 out of 10 experimentally determined constants and provide new, more accurate values for the remaining 4 constants. C 2015 AIP Publishing LLC. [http://dx

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Piezo-optic tensor of crystals from quantum-mechanical calculations

Erba

Ruggiero

Korter

et al. 2015

The Journal of Chemical Physics

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“…Along the optical axis ( k || Z ) the optical birefringence equals zero ( Δn k = Δn 3 = 0) thereby * 32 = 32 . For the tetragonal symmetry of LTB crystals, 22…”

Section: Experimental Results and Analysismentioning

confidence: 99%

Characterization of photoelastic materials by combined Mach-Zehnder and conoscopic interferometry: Application to tetragonal lithium tetraborate crystals

Mytsyk

Andrushchak

Vynnyk

et al. 2020

Optics and Lasers in Engineering

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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 piezoop-tic and photoelastic measurements. The performance of such combined approach is demonstrated on tetragonal lithium tetraborate (LTB) single crystals, as an example. Special attention is paid to methodological and metrological aspects, such as measurement accuracy and the quantitative error analysis of the resulting measurements. Performing the interferometric measurements for different geometries of piezooptic coupling the full sets of piezooptic and photoelastic tensor constants of LTB crystals have been determined. The acoustooptic efficiency, on the other hand, has been evaluated using the magnitudes of photoelastic constants derived from the piezooptical measurements. For the geometries with strong photoelastic coupling LTB demonstrates quite large acous-tooptic performance with figure of merit value, М 2 , achieving 2.12 × 10 -15 s 3 /kg. It is several times larger than that of strontium borate crystals, nowadays the best acoustooptic material in deepultraviolet spectral region.

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“…В последнее время существенно увеличилось количество работ, посвященных изучению фотоупругости (пьезои упругооптический эффекты) в кристаллах, имеющих разные классы симметрии [1][2][3][4][5][6][7][8][9]. Это обусловлено поиском новых оптических материалов с высокой акустооптической (АО) эффективностью.…”

Section: Introductionunclassified

Фотоупругие Свойства Кристаллов Сульфата Калия

Стадник¹,

Матвиив²,

Щепанский³

et al. 2019

Физика Твердого Тела

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Поступила в Редакцию 25 июня 2019 г. В окончательной редакции 25 июня 2019 г. Принята к публикации 8 июля 2019 г.Изучены спектральные зависимости абсолютных пьезооптических коэффициентов кристаллов сульфата калия и установлена их незначительная дисперсионная зависимость. Используя значения коэффициентов упругой жесткости и абсолютных пьезооптических коэффициентов, заполнена матрица упругооптических коэффициентов pin данных кристаллов. Рассчитан коэффициент акустооптической эффективности M 2 и показано, что за величиной максимальных значений он более чем на порядок выше, чем у кристаллов кварца и бората стронция. Предложено, учитывая коротковолновую границу области прозрачности кристаллов сульфата калия (∼ 170 nm), использовать их для акустооптической модуляции ультрафиолетового излучения.Ключевые слова: сульфат калия, пьезо-и упругооптические коэффициенты, акустооптическая эффективность.

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Study of piezo-optic effect of calcium tungstate crystals by the conoscopic method

Cited by 17 publications

References 8 publications

Piezo-optic tensor of crystals from quantum-mechanical calculations

Piezo-optic tensor of crystals from quantum-mechanical calculations

Characterization of photoelastic materials by combined Mach-Zehnder and conoscopic interferometry: Application to tetragonal lithium tetraborate crystals

Фотоупругие Свойства Кристаллов Сульфата Калия

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