Autor: Ubizskii, S - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Modeling and optimization of the YAG:Yb microchip laser passively Q-switched by YAG:Cr absorber
Autorzy:: Buryy, O
Ubizskii, S
Powiązania:: https://bibliotekanauki.pl/articles/175041.pdf
Data publikacji:: 2014
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: Yb:YAG crystal
microlaser
Q-switching
numerical simulation
Opis:: Based on analytical and numerical solutions of the rate equations system and the heat conductivity equation, the model of the quasi-three-level passively Q-switched YAG:Yb/YAG:Cr microchip laser is developed. The obtained results are used for its optimization, i.e., for the determination of the output mirror reflectivity, the pumping beam radius, the thickness of the absorber and the phototropic centers concentration maximizing the energy in the laser pulse. The influence of the thermal load on the spatial parameters of the laser beam is also determined.
Źródło:: Optica Applicata; 2014, 44, 4; 621-636
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Induced Absorption in Gadolinium Gallium Garnet Irradiated by High Energy $\text{}^{235}U$ Ions
Autorzy:: Potera, P.
Ubizskii, S.
Sugak, D.
Schwartz, K.
Powiązania:: https://bibliotekanauki.pl/articles/1550538.pdf
Data publikacji:: 2010-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.72.jn
81.40.Wx
61.80.Ba
61.80.Jh
61.72.J-
Opis:: The present work is devoted to investigation of optical absorption in pure $Gd_{3}Ga_{5}O_{12}$ (GGG) single crystals in the spectral range 0.2-1.1 μm induced under influence of the $\text{}^{235}U$ ions irradiation with energy 2640 MeV and a fluence $10^{9}-10^{11} cm^{-2}$. The induced absorption for $10^{9} cm^{-2}$ is caused by recharging of point defects, both growth ones and impurities. After irradiation by $\text{}^{235}U$ ions with fluences starting from $3 \times 10^{9} cm^{-2}$ the absorption rise is probably caused by contribution of the lattice destroying as a result of heavy ion bombardment as well as radiation displacement defects.
Źródło:: Acta Physica Polonica A; 2010, 117, 1; 181-183
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Optical in situ Study of Reduction/Oxidation Processes in Cr,Mg:YAG Epitaxial Film
Autorzy:: Buryy, O.
Ubizskii, S.
Syvorotka, I.
Becker, K.
Powiązania:: https://bibliotekanauki.pl/articles/1550540.pdf
Data publikacji:: 2010-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.72.Cc
66.30.Dn
66.30.hd
78.30.Hv
78.40.Ha
Opis:: The changes of the optical absorption spectra of Cr,Mg:YAG epitaxial film caused by high-temperature redox treatment are investigated by means of in situ spectroscopy. The spectra were registered in the visible and near-IR spectral regions at temperatures up to 1100 K. The kinetics of optical absorption changing were obtained in the temperature range from 936 K to 1091 K and were described by mathematical model connecting the chromium recharging process with oxygen vacancies diffusion. The parameters of the model were determined from the approximations of the experimental kinetics.
Źródło:: Acta Physica Polonica A; 2010, 117, 1; 184-188
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Optical Properties of GGG Epitaxial Films Grown from PbO-B₂O₃-V₂O₅ Flux
Autorzy:: Syvorotka, I.
Sugak, D.
Luchechko, A.
Zhydachevskyy, Ya.
Ubizskii, S.
Powiązania:: https://bibliotekanauki.pl/articles/1030998.pdf
Data publikacji:: 2018-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 81.15.Lm
78.66.Nk
Opis:: The paper reports a growth of the high-quality Gd₃Ga₅O₁₂ (GGG) homoepitaxial films by the liquid phase epitaxy technique using the PbO-B₂O₃ and PbO-B₂O₃-V₂O₅ fluxes. The influence of the flux composition containing V₂O₅ as well as the growth temperature is discussed basing on the optical absorption and the electron probe micro analysis results.
Źródło:: Acta Physica Polonica A; 2018, 133, 4; 954-958
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Eight-Channel Optical Add Drop Multiplexer Based on Ring Resonator Using LNOI Channel Waveguides
Autorzy:: Kumar, H.
Janyani, V.
Buryy, O.
Ubizskii, S.
Sugak, D.
Singh, G.
Powiązania:: https://bibliotekanauki.pl/articles/1030850.pdf
Data publikacji:: 2018-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 42.79.Sz
Opis:: In this paper we report on an eight-channel optical add drop multiplexer based on ring resonator using lithium niobate on insulator channel waveguides. It is suitable for a DWDM-GPON network with channel spacing of 100 GHz in C-band and data rate is 10 Gbps. The insertion loss at the drop port is maximum 1.2 dB and the Q-factor is 1636. It can be used as multiplexer as well as demultiplexer in 8-channel DWDM systems.
Źródło:: Acta Physica Polonica A; 2018, 133, 4; 997-999
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Effect of Lutetium Co-Doping on the Main Dosimetric Peak of YAP:Mn²⁺ Thermoluminescent Detectors
Autorzy:: Zhydachevskyy, Ya.
Głowacki, M.
Martynyuk, N.
Ubizskii, S.
Berkowski, M.
Suchocki, A.
Powiązania:: https://bibliotekanauki.pl/articles/1030950.pdf
Data publikacji:: 2018-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.55.Hx
Opis:: An effect of lutetium co-doping on photoluminescent and thermoluminescent properties of the Mn²⁺-doped (Lu-Y)AP crystals (with Lu content from 0 to 20% with respect to Y) grown by the Czochralski technique has been studied. It was found that the maximum of the thermoluminescent peak at 200°C is shifted towards higher temperatures at Lu content more than 5%. At the same time the position of the second thermoluminescent peak near 350°C remains unchanged. The observed changes in the thermoluminescent peak position are discussed in terms of the point defects of the material.
Źródło:: Acta Physica Polonica A; 2018, 133, 4; 973-976
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Thermal Behaviour of PrCo_{1-x}Fe_xO₃ Probed by X-ray Synchrotron Powder Diffraction and Impedance Spectroscopy Measurements
Autorzy:: Pekinchak, O.
Sugak, D.
Ubizskii, S.
Suhak, Yu.
Fritze, H.
Vasylechko, L.
Powiązania:: https://bibliotekanauki.pl/articles/1029711.pdf
Data publikacji:: 2018-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.66.Fn
61.05.cp
65.40.De
72.60.+g
Opis:: Crystal structure and transport properties of the mixed praseodymium cobaltites-ferrites PrCo_{1-x}Fe_xO₃ have been studied in the temperature range of 298-1173 K by a combination of in situ X-ray synchrotron powder diffraction and temperature dependent impedance spectroscopy measurements. In situ high temperature powder diffraction examination of PrCo_{1-x}Fe_xO₃ series revealed considerable anomalies in the lattice expansion which are especially pronounced for the cobalt-rich specimens. These anomalies, which are reflected in a sigmoidal dependence of the unit cell dimensions and in the considerable increase of the thermal expansion coefficients, are obviously associated with transitions of Co^{3+} ions from low spin to the higher spin states and the coupled metal-insulator transitions, occurring in in rare earth cobaltites at the elevated temperatures. Indeed, the temperature-dependent impedance measurements clearly prove the change of conductivity type from dielectric to the metallic behaviour in the mixed cobaltite-ferrites PrCo_{1-x}Fe_xO₃ at the elevated temperatures.
Źródło:: Acta Physica Polonica A; 2018, 133, 4; 798-801
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: The Passively Q-switched Microchip Nd:YAG Laser Optimization for Rangefinder Applications
Autorzy:: Buryy, O.
Iznin, A.
Syvorotka, I.
Sugak, D.
Ubizskii, S.
Vakiv, M.
Powiązania:: https://bibliotekanauki.pl/articles/1550634.pdf
Data publikacji:: 2010-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 42.60.Gd
Opis:: 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.
Źródło:: Acta Physica Polonica A; 2010, 117, 1; 238-243
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: In situ Investigation of $OH^{-}$ Absorption in $LiNbO_{3}$ and $LiNbO_{3}:MgO$ Crystals during Reducing/Oxidizing Annealing
Autorzy:: Sugak, Yu.
Sugak, D.
Zhydachevskii, Ya.
Solskii, I.
Buryy, O.
Ubizskii, S.
Becker, K.
Powiązania:: https://bibliotekanauki.pl/articles/1550507.pdf
Data publikacji:: 2010-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 42.70.Mp
78.30.-j
77.84.-s
Opis:: The work presents experimental results of an in situ investigation of the $OH^{-}$ absorption in pure and MgO-doped $LiNbO_{3}$ crystals during reducing (95% Ar + 5% $H_{2}$) and oxidizing $(O_{2})$ high-temperature treatments in the temperature range from room temperature to 820 K. The absorption spectra measured in situ at high temperatures in reducing/oxidizing atmospheres have been analyzed. The origin of the changes in optical absorption caused by heating of the crystal is discussed in terms of the OH-bonds orientation change.
Źródło:: Acta Physica Polonica A; 2010, 117, 1; 170-173
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Orientation States in Rhombic NdGaO$\text{}_{3}$
Autorzy:: Savytskii, D. I.
Ubizskii, S. B.
Vasylechko, L. O.
Syvorotka, I. M.
Matkovskii, A. O.
Powiązania:: https://bibliotekanauki.pl/articles/1964528.pdf
Data publikacji:: 1997-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.72.Mm
62.20.Dc
Opis:: The ferroelastic domain structure of NdGaO$\text{}_{3}$ is analyzed by three theories: group symmetry, tensor method and twinning by pseudosymmetry. The theories provide a coherent description of domain pairs and a determination of the position of W and S walls.
Źródło:: Acta Physica Polonica A; 1997, 92, 1; 231-236
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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