Entity

Time filter

Source Type

Yekaterinburg, Russia

Kijko V.S.,Ural Federal University | Maksimov R.N.,Ural Federal University | Shitov V.A.,Institute of Electrophysics UB RAS | Demakov S.L.,Ural Federal University | Yurovskikh A.S.,Ural Federal University
Journal of Alloys and Compounds | Year: 2015

Abstract Transparent Yb-doped Lu2O3 ceramic samples were fabricated via conventional vacuum and spark plasma sintering. Nanoparticles synthesized by laser ablation method were used as starting material. The morphology and phase evolution of the nanopowder were studied by transmission electron microscopy, simultaneous thermal analysis and X-ray diffraction. The obtained nanoparticles exhibited the monoclinic phase and were fully converted into the main cubic phase after calcination at 1100 °C for 1 h. Conventional vacuum sintering of Yb:Lu2O3 powder compact at 1780 °C for 20 h resulted in a fully-dense ceramics with an average grain size of 1.6 μm and optical transmittance of 79.3% at 1080 nm. Spark plasma sintering of the calcined Yb:Lu2O3 nanoparticles at 1450 °C and 15 kN for 40 min led to a 0.2 μm-grained ceramics exhibiting an optical transmittance of 75.6% at 1080 nm. © 2015 Elsevier B.V. All rights reserved. Source


Osipov V.V.,Institute of Electrophysics UB RAS | Shitov V.A.,Institute of Electrophysics UB RAS | Maksimov R.N.,Ural Federal University | Solomonov V.I.,Institute of Electrophysics UB RAS
Optical Materials | Year: 2015

Neodymium or ytterbium-doped transparent yttrium oxide ceramics with different tetravalent sintering additives (ZrO2, HfO2, or CeO2) were fabricated from nanopowders produced by laser ablation method. Phase composition and distribution of dopants in the synthesized nanopowders and ceramics were studied by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), and scanning electron microscopy coupled with energy dispersive X-ray (SEM/EDX) spectroscopy. The tetravalent additives led to a decrease in grain size and an improvement in transmittance at the lasing wavelengths. However, an excess of tetravalent ions led to the formation of dispersed scattering volumes. We observed particles with modulated composition for nanopowder of Nd:Y2O3 doped by 10 mol% HfO2. The estimations based on Rayleigh light scattering showed that the maximum size of the dispersed scattering volume is below 20 nm. © 2015 Elsevier B.V. Source


Bagayev S.N.,RAS Institute of Laser Physics | Osipov V.V.,Institute of Electrophysics UB RAS | Vatnik S.M.,RAS Institute of Laser Physics | Shitov V.A.,Institute of Electrophysics UB RAS | And 4 more authors.
Optical Materials | Year: 2015

We fabricate Ho:YAG transparent ceramics based on nanopowders produced by laser ablation method via two approaches. Higher transmittance (82% in the infrared region) is achieved in ceramics prepared with an additional round of pre-calcining before sintering. We evaluate the average volume of the scattering centers in the ceramics and their distribution along the sample depth by the direct count method using an optical microscope and by the novel method of collinear two-photon interband photoexcitation, respectively. The laser characteristics of the 1% Ho:YAG ceramics are investigated using an intracavity pumping scheme. The slope efficiency is ∼40% relative to the absorbed pumping power at 1.85 μm. © 2015 Elsevier B.V. Source


Osipov V.V.,Institute of Electrophysics UB RAS | Orlov A.N.,Institute of Electrophysics UB RAS | Maksimov R.N.,Institute of Electrophysics UB RAS | Lisenkov V.V.,Ural Federal University | Platonov V.V.,Institute of Electrophysics UB RAS
Physica Status Solidi (C) Current Topics in Solid State Physics | Year: 2013

Transparent yttria ceramics were fabricated by sintering a mixture of 1 at.% Nd:Y2O3 and HfO2 nanopowders produced by laser synthesis method. The best transmittance was 80.96% at the wavelength of λ=1080 nm in 6 mol.% HfO2 doped sample (1.5 mm thick). The additives of hafnium broaden both pumping and luminescence bands of Nd3+ ion in yttria ceramics. The luminescence intensity of 4F3/2→4I11/2 transition was little affected by hafnium concentration. The effective lifetime of 4F3/2 level in Nd:Y2O3 ceramics enhanced by 30% at 10 mol.% HfO2 doping concentration and the decay kinetics of laser transition attains Förster's behavior. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Osipov V.V.,Institute of Electrophysics UB RAS | Shitov V.A.,Institute of Electrophysics UB RAS | Maksimov R.N.,Ural Federal University | Solomonov V.I.,Institute of Electrophysics UB RAS
Optical Materials | Year: 2015

Neodymium or ytterbium-doped transparent yttrium oxide ceramics with different tetravalent sintering additives (ZrO2, HfO2, or CeO2) were fabricated from nanopowders produced by laser ablation method. Phase composition and distribution of dopants in the synthesized nanopowders and ceramics were studied by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), and scanning electron microscopy coupled with energy dispersive X-ray (SEM/EDX) spectroscopy. The tetravalent additives led to a decrease in grain size and an improvement in transmittance at the lasing wavelengths. However, an excess of tetravalent ions led to the formation of dispersed scattering volumes. We observed particles with modulated composition for nanopowder of Nd:Y2O3 doped by 10mol% HfO2. The estimations based on Rayleigh light scattering showed that the maximum size of the dispersed scattering volume is below 20nm. © 2015 Elsevier B.V. Source

Discover hidden collaborations