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1
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Growing Large Size Complex Oxide Single Crystals by Czochralski Technique for Electronic Devices

100%
Solskii I., Sugak D., Vakiv M.
Acta Physica Polonica A
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2013
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vol. 124
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issue 2
314-320
EN
This paper is devoted to the use and further development of the single crystal growing technique invented by Professor Jan Czochralski (1885-1953). The possibilities of the Czochralski technique are demonstrated. Further improvements were introduced at the Scientific Research Company "Carat" (Lviv, Ukraine) to grow large size complex oxide single crystals. The paper presents an overview of some single crystals grown with the use of a modified technology. Growth parameters and properties of resulting crystals are summarized to show a high potential of the Czochralski technique as an industrial technology to grow large-size, high quality, and structurally perfect single crystals of complex oxides.
2
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The Passively Q-switched Microchip Nd:YAG Laser Optimization for Rangefinder Applications

76%
Buryy O., Iznin A., Syvorotka I., Sugak D., Ubizskii S., Vakiv M.
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issue 1
238-243
EN
The problem of Q-switched microchip Nd^{3+}:YAG/Cr^{4+}:YAG laser optimization is considered. In accordance with requirements of laser location, the optimization consists in determination of such values of the saturable absorber (Cr^{4+}:YAG) thickness, the output laser mirror reflectivity and the pumping power, that ensure the generation of the sufficiently short ( ≈0.5 ns) laser pulses at the repetition rate of about 10 kHz and the peak power of about 1 kW or higher. Firstly, the dependences of the laser radiation parameters on the constructive ones are analyzed in the frames of Xiao-Bass model of Q-switched microchip laser. The obtained dependences are used for laser optimization. As it is shown, the parameters of laser radiation close to predominating ones are achieved at the absorber thickness of 140 μm, the output mirror reflectivity of 0.97 and the pumping power of 2.5 W.
3
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Optical Properties of LiNbO₃-Ag Nanocomposites

76%
Bolesta I., Vakiv M., Haiduchok V., Kushnir O., Demchuk A., Nastyshyn S., Gamernyk R.
Acta Physica Polonica A
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2018
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vol. 133
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issue 4
860-863
EN
The article presents the experimental results of the investigation of the absorption spectra and nonlinear refraction of the metal-dielectric nanocomposite that contains the lithium niobate pyroelectric crystal coated with the silver nanofilms on its surface. The atomic force microscopy surface research of these crystals with and without films are also provided. The nanowidth silver films impact on optical spectra and nonlinear refraction of LiNbO₃-Ag nanocomposite was analyzed depending on the sign of the side charge of the crystal, that contain nanofilms.
4
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Optical Absorption and Luminescence of Gd_{3}Ga_{5}O_{12}:Cr,Mg Epitaxial Films

76%
Zakharko Y., Syvorotka I., Luchechko A., Syvorotka I., Sugak D., Vakiv M.
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issue 1
111-113
EN
The optical absorption, emission spectra and luminescence decay kinetics under photoexcitation of Gd_{3}Ga_{5}O_{12} (GGG) garnet epitaxial films doped with Cr^{3+} ions and co-doped with Cr^{3+} and Mg^{2+} ions have been investigated. Luminescence of the GGG:Cr films due to ^{4}T_{2} → ^{4}A_{2} and ^{2}E → ^{4}A_{2} transitions in Cr^{3+} ions have been observed. Increase of the activator ions concentration has an influence on the intensity and decay time of Cr^{3+} ions photoluminescence. Introduction of the magnesium ions leads to partial transformation of chromium valence state (Cr^{3+} → Cr^{4+}) and to the appearance of a broad absorption band with the maximum at 860 nm. The narrow lines with luminescence maxima at 704 and 706 nm have arisen in the highly doped GGG:Cr,Mg films.
5
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Design and Characterization of Resonator Mirrors for Microlasers on the Base of YAlO_3 Single Crystals Activated with Nd^{3+} and Tm^{3+} Ions

64%
Ilyina O., Hajduchok V., Izhnin O., Sugak D., Kuzmak R., Syvorotka I., Dyachok Y., Groshovyy I., Vakiv M.
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issue 1
244-247
EN
Most of the challenges in laser technology can be overcome by using yttrium-aluminum perovskite (YAlO_3, YAP). These crystals are characterized by more advantages than typical Y_3Al_{5}O_{12} (YAG) crystals. However, the creation of microlasers with these materials is just under development. The aim of the work was to theoretically design the input and output cavity mirrors for microlasers on the base of YAlO_3:Nd or YAlO_3:Tm single crystals, and to investigate those resonators obtained according to the theoretical design using electron beam evaporation method.
6
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Investigation of Co Ions Diffusion in Gd₃Ga₅O₁₂ Single Crystals

52%
Sugak D., Syvorotka I., Yakhnevych U., Buryy O., Vakiv M., Ubizskii S., Włodarczyk D., Zhydachevskyy Y., Pieniążek A., Jakiela R., Suchocki A.
Acta Physica Polonica A
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2018
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vol. 133
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issue 4
959-964
EN
Spatial changes of properties of Gd₃Ga₅O₁₂ (GGG) single crystals caused by diffusion of cobalt ions during high-temperature annealing (1200°C, 24 h) in Co₃O₄ powder are investigated. The registration of these changes was carried out by optical spectrophotometry, microscopy and micro-Raman scattering methods. Changes in structure of near-surface layers of the crystal were investigated by X-ray diffraction technique. It was shown that the additional absorption induced by annealing is related to intra-center optical transitions in Co²⁺ ions, which occupy tetrahedral positions in the garnet structure at the distances of 250-500 μm from the crystal surface. The dependence of induced absorption with depth has got a non-monotonous character with a maximum at 400 μm. A comparison of the results obtained by different methods allows to suppose that the thermal treatment of GGG in the presence of cobalt ions leads to formation of the structurally and chemically non-uniform layer with a width about 500 μm.
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