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Golovan L.A.,Moscow State University | Petrov G.I.,Texas A&M University | Gayvoronsky V.Ya.,Ukrainian Academy of Sciences | Pritula I.M.,Institute for Single Crystals NAS of Ukraine | Yakovlev V.V.,Texas A&M University
Laser Physics Letters | Year: 2014

Broadband second-harmonic (SH) and sum-frequency generation was studied in KH2PO4 crystals with incorporated anatase modification of titania nanocrystals. A tiny amount (10-5wt.%) of titania nanoparticles in the anatase phase exhibits a pronounced (up to 15%) increase of the SH efficiency in comparison with the nominally pure potassium dihydrogen phosphate (KDP) crystal. Higher anatase fraction (10-4wt.%) results in a reduction of the SH conversion efficiency. The rise of the SH signal is attributed to resonant excitation of the defect states at the nanocrystal interface, and its subsequent decrease at higher concentration is likely to be related to a light scattering in the crystal bulk. © 2014 Astro Ltd. Source

Kovalenko N.,Institute for Single Crystals NAS of Ukraine
Journal of Nonlinear Optical Physics and Materials | Year: 2011

A theoretical analysis of the condition of scalar phase-matched second harmonic generation and optical parametric oscillation (OPO) in single-crystalline samples Zn 0.52Mg 0.48Se is presented. The calculated range of pumping for second harmonic generation with phase matching is 5.1-13 μm. The tuning range of the optical parametric oscillator based on Zn 0.52Mg 0.48Se is determined. The combination of active media and nonlinear converter for OPO in the same optical element are proposed. © 2011 World Scientific Publishing Company. Source

Taranyuk V.,Institute for Scintillation Materials of Ukraine | Gektin A.,Institute for Scintillation Materials of Ukraine | Shiran N.,Institute for Scintillation Materials of Ukraine | Shlyakhturov V.,Institute for Scintillation Materials of Ukraine | And 3 more authors.
Journal of Crystal Growth | Year: 2013

Abstract The work is devoted to the controlled crystal growth procedure providing of optimal doping of dielectric halide materials (LiF crystals in particular). Two series of LiF crystals were studied. One series is represented by ultra- and nominal pure crystals, as well as crystals doped with polyvalent oxides (Nb2O5, WO3 and TiO2), which were grown by classical Kyropoulos method in vacuum, second series involves crystals grown using the skull method. It is shown that the skull technique is a quite efficient method of variously doped LiF crystal growth as compare with the classic Kyropoulos method. © 2013 Elsevier B.V. Source

Gaponov A.A.,Dnipropetrovsk National University | Zlenko E.T.,Dnipropetrovsk State Medical Academy | Shishkina S.V.,Institute for Single Crystals NAS of Ukraine | Shishkin O.V.,Institute for Single Crystals NAS of Ukraine | And 4 more authors.
Medicinal Chemistry Research | Year: 2016

The paper reports the synthesis and in vivo pharmacological studies of a series of N-alkyl-1,5-benzodiazepine-2-ones. In this work, 19 novel benzodiazepine derivatives have been prepared and characterized by spectroscopic methods including 2D nuclear magnetic resonance techniques. Crystal structure of 1-benzyl-8-methyl-4-phenyl-1H-benzo[b][1,4]diazepin-2(3H)-one has also been determined by X-ray diffraction. Prediction of activity spectra for substances prediction and docking studies onto human serum albumin were conducted. Two compounds under these investigation showed high antihypoxic, tranquilizing, and anticonvulsant activity in vivo. © 2016 Springer Science+Business Media New York Source

Blonskyi I.,Ukrainian Academy of Sciences | Kadan V.,Ukrainian Academy of Sciences | Shynkarenko Y.,Ukrainian Academy of Sciences | Yarusevych O.,Ukrainian Academy of Sciences | And 3 more authors.
Applied Physics B: Lasers and Optics | Year: 2015

We report on the experimental observation of periodic modulation of the axial luminescence intensity along the femtosecond filament track in sapphire and crystal quartz. The physical reason for the modulation is a cyclic transformation of the polarization state of the light pulse traveling in birefringent medium, caused by the phase raid between the ordinary and extraordinary rays, and different cross sections of multiphoton absorption for linear and circular polarizations. © 2015, Springer-Verlag Berlin Heidelberg. Source

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