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Wyświetlanie 1-15 z 27
Tytuł:
Crystal Field Analysis of Cr$\text{}^{3+}$ Energy Levels in LiGa$\text{}_{5}$O$\text{}_{8}$ Spinel
Autorzy:
Brik, M. G.
Avram, N. M.
Avram, C. N.
Powiązania:
https://bibliotekanauki.pl/articles/2047880.pdf
Data publikacji:
2007-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Hj
71.70.Ch
Opis:
Detailed and consistent crystal field analysis of the LiGa$\text{}_{5}$O$\text{}_{8}$:Cr$\text{}^{3+}$ absorption spectrum is performed in the present paper by using the exchange charge model of crystal field. We calculate the crystal field parameters from the crystal structure date and diagonalize the crystal field Hamiltonian to obtain the energy level structure of Cr$\text{}^{3+}$ ions in LiGa$\text{}_{5}$O$\text{}_{8}$. The obtained energy levels and estimated Racah parameters B and C were compared with the experimental spectroscopic data; good agreement was demonstrated.
Źródło:
Acta Physica Polonica A; 2007, 112, 5; 1055-1060
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of As Grown and Induced Structural Defects in SrLaXO$\text{}_{4}$ (x = Al, Ga) Crystals
Autorzy:
Ryba-Romanowski, W.
Gołąb, S.
Dereń, P.
Dominiak-Dzik, G.
Pisarski, W.
Gloubokov, A.
Powiązania:
https://bibliotekanauki.pl/articles/1964366.pdf
Data publikacji:
1997-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Hx
42.70.Hj
Opis:
SrLaGaO$\text{}_{4}$ and SrLaAlO$\text{}_{4}$ substrates grown by the Czochralski method have no twins or subgrains however they show strong tendency to form point defects. The nature of these defects is not well understood yet. They may be associated with deviations from stoichiometry andor oxygen atoms located in the interstitial positions. Virtually all title crystals grown by the Czochralski method display various colours from light green to deeply red owing to light absorption by point defects. Absorption centres appear to be very stable in time and resistant to usual thermal treatment. UV excitation increases the density of defects and gives rise to strong photoluminescence, otherwise too weak to be observed.
Źródło:
Acta Physica Polonica A; 1997, 92, 1; 191-196
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Study of SrLaGaO$\text{}_{4}$ and SrLaGa$\text{}_{3}$O$\text{}_{7}$ Doped with Nd$\text{}^{3+}$ and Yb$\text{}^{3+}$
Autorzy:
Ryba-Romanowski, W.
Gołąb, S.
Pisarski, W.
Dominiak-Dzik, G.
Gloubokov, A.
Powiązania:
https://bibliotekanauki.pl/articles/1945654.pdf
Data publikacji:
1996-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Hx
42.70.Hj
Opis:
Single crystals of SrLaGaO$\text{}_{4}$ and SrLaGa$\text{}_{3}$O$\text{}_{7}$ singly doped with Nd and codoped with Nd and Yb have been grown by the Czochralski method. Both the compounds form tetragonal crystals but belong to different space groups. A common feature of these matrices is a structural disorder resulting from statistical distribution of Sr$\text{}^{2+}$ and La$\text{}^{3+}$ ions over the lattice sites. A previous investigation of a laser diode pumped SrLaGa$\text{}_{3}$O$\text{}_{7}$:Nd laser revealed that inhomogeneous broadening of spectral lines of Nd$\text{}^{3+}$ was advantageous for optical pumping and did not influence adversely the extraction efficiency. The present paper deals mainly with optical properties of Yb$\text{}^{3+}$ ions which are of interest for the design of lasers pumped by a diode laser and operating near 1 μm.
Źródło:
Acta Physica Polonica A; 1996, 90, 2; 399-405
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Growth of Oxide Laser Crystals by Czochralski Method
Autorzy:
Zharikov, E.
Lis, D.
Subbotin, K.
Dudnikova, V.
Zaitseva, O.
Powiązania:
https://bibliotekanauki.pl/articles/1399457.pdf
Data publikacji:
2013-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.10.Fq
42.70.Hj
Opis:
The growth of series of actual laser crystals belonging to different structural types by the Czochralski method is presented. The primary attention is given to single crystalline compounds and their solid solutions with garnet structure (scandium-containing rare-earth garnets with general formula ${LnSc}_3[ScMe]_2Me_3O_{12}$, Me = Al, Ga) as well as with olivine (forsterite $Mg_2SiO_4$) and scheelite structure (double tungstates and molybdates with formula $NaLn(TO_4)_2$, where T = Mo or W). The broad bands of luminescence and absorption produced by activator ions in these laser hosts that appear either as a result of structural disorder (garnets, scheelites) or due to the doping by transition metal ions (chromium in forsterite) join together these representatives of different structural classes and determine their application in photonics. The paper considers the problems of growing of large crystals with uniform distribution of components and dopants, determination of congruently melting composition, especially in compounds with complex isomorphism. The mutual influence of components and dopants, redistribution of ions along crystallographically non-equivalent sites in the structure, alteration of valency of transition metal ions accompanied with the change of their segregation coefficients under variation of redox conditions is discussed.
Źródło:
Acta Physica Polonica A; 2013, 124, 2; 274-285
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Characterization of Erbium Lithium Niobium Gallium Garnet
Autorzy:
Toma, O.
Gheorghe, L.
Vlaicu, A.
Powiązania:
https://bibliotekanauki.pl/articles/1491286.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Hj
78.55.Hx
Opis:
The synthesis of a new garnet, $Er_3Li_{0.275}Nb_{0.275}Ga_{4.45}O_{12}$ (ErLNGG), by solid-state reaction, is reported. A comparison of the fluorescence spectra of $Er^{3+}$ in ErLNGG, Er-doped (0.1 at.%) calcium lithium niobium gallium garnet (CLNGG), and Er(50 at.%):CLNGG is presented. The narrowing of luminescence lines suggests an ordering of the partially disordered CLNGG with the increase of erbium concentration.
Źródło:
Acta Physica Polonica A; 2012, 121, 1; 193-195
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the γ-Radiation on the Generation Characteristics of the YAlO_{3}:Nd Crystals
Autorzy:
Sugak, D. Yu
Matkovskii, A. O.
Grabovskii, V. V.
Prokhorenko, V. I.
Suchocki, A.
Durygin, A. M.
Solskii, I. M.
Shakhov, A. P.
Powiązania:
https://bibliotekanauki.pl/articles/1968884.pdf
Data publikacji:
1998-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Hj
61.72.Ji
Opis:
The results of investigation of the influence of γ-radiation by $\text{}^{60}$Co-source on the YAlO$\text{}_{3}$:Nd laser generation characteristics are presented in this paper. The significant decrease in the output energy after γ-irradiation was obtained. The energetic characteristics are restored after illumination of the γ-irradiated laser rods by 1000-10000 pulses of the pumping lamp light. The additional absorption spectrum is induced by γ-irradiation in the crystals. The nature of the created in this way colour centres is discussed. The mechanism of influence of the colour centres on generation properties of the crystals is discussed.
Źródło:
Acta Physica Polonica A; 1998, 93, 4; 643-648
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Methods in Characterization of HTSC Thin Film Substrates
Autorzy:
Ryba-Romanowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/1964242.pdf
Data publikacji:
1997-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Hx
42.70.Hj
Opis:
Short overview of optical methods which proved to be useful in the characterization of HTSC thin film substrates is presented. Preliminary tests in polariscopic arrangements, interferometric measurements, optical absorption and emission spectroscopy reveal macroscopic deficiencies of the crystal. Intentionally introduced impurity ions serve as probes of a local strength and symmetry of the crystal field. Results of optical study of SrLaGaO$\text{}_{4}$ and SrLaAlO$\text{}_{4}$ crystals are presented and discussed.
Źródło:
Acta Physica Polonica A; 1997, 92, 1; 135-138
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Short Review on Fluoride Laser Crystals Grown by Czochralski Method at IPEN
Autorzy:
Baldochi, S.
Ranieri, I.
Powiązania:
https://bibliotekanauki.pl/articles/1399462.pdf
Data publikacji:
2013-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.10.Fq
42.70.-a
42.70.Hj
Opis:
In this article there are presented the developments on the crystal growth by the Czochralski method of fluoride laser materials at the Center for Lasers and Applications from Institute of Nuclear and Energy Research, IPEN, Brazil. A brief report of the Czochralski furnace preparation for fluorides growth regarding to its construction materials, influence of the heating assemblies in the thermal profiles and the benefits of using a suitable atmosphere is provided. Moreover, to demonstrate the importance of this technique to the advances on laser systems over the last years there are described the specific growth conditions established to obtain fluoride crystals with suitable properties for practical application as laser hosts. $LiREF_4$ (RE = rare earth) scheelite crystals have been studied to compare $LiYF_4$ (YLF) with its isomorphs, including solid solutions of the type-$LiY_{1-x}Ln_{x}F_4$ (Ln = Gd or Lu) and $LiGd_{1-x}Lu_{x}F_4$, relating to their optical quality, spectroscopic and laser properties. Some results regarding the development of new laser hosts of these materials doped with Nd, Er, Pr and co-doped Yb, Nd and Tm are also presented. The growth particularities of transition metals doped fluoride crystals such as $BaLiF_3$:TM (TM = Ni and Co) and $LiSrAlF_6$:Cr are also reported.
Źródło:
Acta Physica Polonica A; 2013, 124, 2; 286-294
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation and Characterization of Basic and $Er^{3+}$-Doped Glasses in the System $Y_{2}O_{3}-Al_{2}O_{3}-ZrO_{2}$
Autorzy:
Klement, R.
Hruška, B.
Hronský, V.
Olčák, D.
Powiązania:
https://bibliotekanauki.pl/articles/1382720.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Hj
42.70.Ce
78.55.Qr
Opis:
The undoped, and Er-doped yttrium aluminozirconate (AYZ) glasses were prepared by flame synthesis in the form of transparent glass microbeads. The $ZrO_{2}$ content was in the range between 5 and 20 mol. %. The prepared glass microbeads were characterised by optical microscopy, SEM, XRD, DSC, $\text{}^{27}Al$ MAS NMR, UV-VIS-NIR and fluorescence spectroscopy. The thermal stability of AYZ glasses, expressed in terms of the difference between the glass transition temperature, $T_{g}$, and the onset of crystallization, $T_{x}$, was not affected by the increasing $ZrO_{2}$ content. The $\text{}^{27}Al$ MAS NMR spectra of studied glass samples reveal that Al atoms are predominantly 4-coordinated in glasses. The AYZ5 and AYZ10 basic glasses were doped with $Er^{3+}$ at the level of 1-5 mol. % of $Er_{2}O_{3}$. The UV-VIS-NIR/fluorescence spectra show characteristic absorptions/emissions, due to the optically active $Er^{3+}$ ions in the host glasses. The absorption/emission properties of guest ions are not significantly affected by the glass host.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 302-303
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative Study between Energy Levels of $Cr^{3+}$ and $Co^{2+}$ Ions Doped in $MgF_{2}$ Crystal
Autorzy:
Nistora, R.
Andreici, L.
Avram, N.
Powiązania:
https://bibliotekanauki.pl/articles/1791222.pdf
Data publikacji:
2009-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.70.Ch
42.70.Hj
61.72.S-
Opis:
The aim of this paper is to present a comparison of the energy level schemes of $Cr^{3+}$ ($3d^{3}$ electrons) and $Co^{2+}$ ($3d^{7}$ electrons), each of ions doped, separately, in $MgF_{2}$ crystal. We report on the detailed and consistent crystal field analysis of $Cr^{3+}$ spectra in $MgF_{2}$ crystal and compare with results, previously obtained, for $Co^{2+}$, doped in same host matrix. The results are based on application of the exchange charge model of crystal field to the calculation of crystal field parameters and energy levels of both ions doped in $MgF_{2}$.The calculations have been performed on previously optimized geometry of $MgF_{2}$ crystal. The obtained results are compared with experimental data and discussed.
Źródło:
Acta Physica Polonica A; 2009, 116, 4; 538-540
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Growth and Characterization of Titanium Doped Spinel Crystals
Autorzy:
Gritsyna, V.
Kazarinov, Yu.
Kobyakov, V.
Lytvynov, L.
Powiązania:
https://bibliotekanauki.pl/articles/1029653.pdf
Data publikacji:
2018-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.10.Fq
61.10.Nz
42.70.Hj
Opis:
MgAl₂O₄ (magnesium aluminates spinel, MAS) single crystals doped with titanium ions obtained by the Verneuil method were non-uniformly colored along of the growth crystallographic direction. The crystals were characterized measuring lattice parameter, optical absorption spectra and relative concentration of impurity atoms (Ti, Mn, Cr, and Fe) in different spots of grown Ti:MAS boule. There was observed the correlation of the intensity of absorption band at 800 nm to the relative concentration of iron supporting the identification of this band with charge transfer transition in complexes Ti⁴⁺+Fe²⁺ → Ti³⁺+Fe³⁺. The new resonant structure at the wavelength of 470 nm was found and tentatively identified with the Fano resonance in the complexes formed by lattice defects and impurity ions.
Źródło:
Acta Physica Polonica A; 2018, 133, 4; 774-777
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydrothermal Synthesis and Microstructural, Optical Properties Characterization of $YVO_4$ Phosphor Powder
Autorzy:
Zhang, S.
Liang, Y.
Gao, X.
Liu, H.
Powiązania:
https://bibliotekanauki.pl/articles/1207386.pdf
Data publikacji:
2014-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.-m
42.70.Hj
78.67.-n
Opis:
The phonon energy of $YVO_4$ crystal is lower than other usual compounds of salt. So it is suitable as host material for down-conversion materials. Hydrothermal method was adopted to synthesize $YVO_4$ phosphor powder with the use of yttrium oxide and sodium vanadate as raw material. The change in the relative integral intensity of the (200) and (112) diffraction peaks indicates that macroscopic stress in the lattice obviously changes with the elevated hydrothermal reaction temperature. The $YVO_4$ phosphor powder synthesized involves a certain agglomeration of small particles. The phonon vibration in the $YVO_4$ originates mainly from the internal vibrations in the vanadium-oxygen tetrahedron, in addition to the Y-O and O-H vibrations. Due to a low phonon energy of only $2.8188 × 10^{-21} J$, $YVO_4$ helps to improve the down-conversion efficiency of rare-earth ions. A bandgap value of approximately 3.8 eV for the synthesized $YVO_4$ powders leads to good absorption properties in the ultraviolet region. Upon excitation by the 320 nm ultraviolet photon, the intrinsic emission of $YVO_4$ powders is annihilated, and a broadband emission of $VO_4^{3-}$ near 450 nm is observed at room temperature. The $YVO_4$ phosphor powder synthesized at 180C exhibits the maximum photoluminescence intensity because of its excellent crystallization.
Źródło:
Acta Physica Polonica A; 2014, 125, 1; 105-110
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental and Theoretical Study of Zircon and Scheelite Phases of $DyVO_4$
Autorzy:
Ermakova, O.
Paszkowicz, W.
López-Solano, J.
Muñoz, A.
Dabkowska, H.
Powiązania:
https://bibliotekanauki.pl/articles/1431671.pdf
Data publikacji:
2012-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Hj
61.43.Bn
61.66.Fn
Opis:
Polycrystalline zircon-type dysprosium orthovanadate, $DyVO_4,$ prepared from a single crystal grown by slow cooling from $PbO//PbF_2$ flux, was studied by X-ray diffraction. Rietveld refinement provided the following unit cell size and oxygen atom coordinates: a=7.14811(4) Å; c=6.30825(4) Å, V=322.323(3) Å3, y($O^{2-}$)=0.4300(4); z($O^{2-}$)=0.2082(4) which are of a particularly high accuracy and show consistency with earlier reported values. Density functional theory calculations within the generalized gradient approximation for the exchange-correlation energy were also performed, providing values of structure parameters which differ by less than 2% from the experimental ones. The agreement between theory and experiment demonstrates the value of these calculations for understanding the structure of compounds of $RVO_4$ family. In addition, density functional theory calculations were performed for the scheelite-type $DyVO_4$; also for this polymorph the discrepancy with the only known set of lattice parameters is less than 2%. Values of oxygen atom coordinates have not been reported yet for this polymorph; here, the calculated ones are quoted.
Źródło:
Acta Physica Polonica A; 2012, 121, 4; 920-927
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electron Spin Resonance Study of Nd$\text{}^{3+}$ and Er$\text{}^{3+}$ Ions in YAlO$\text{}_{3}$
Autorzy:
Jabłoński, R.
Frukacz, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1945633.pdf
Data publikacji:
1996-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.-v
61.72.-y
42.70.Hj
Opis:
In this paper we present the results of ESR and photo-ESR measurements on YAlO$\text{}_{3}$(YAP) single crystals and powder samples doped purposely with about 1 at.% Nd$\text{}^{3+}$ and undoped crystals in which Er$\text{}^{3+}$ was observed as residual dopant. The ESR measurements were carried out at X-band spectrometer in 4-300 K temperature range. The photo-ESR was performed at 5 K using a mercury arc lamp. For the Nd$\text{}^{3+}$ doped crystals the intensity of ESR signal decreased about 2 times during illumination conditions. Moreover, the calculations of the g tensor and A hyperfine structure parameters for Nd$\text{}^{3+}$ and Er$\text{}^{3+}$ were carried out.
Źródło:
Acta Physica Polonica A; 1996, 90, 2; 339-343
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lifetime Measurements of the $\text{}^{4}$S $\text{}_{3}\text{}_{/}\text{}_{2}$ Level in Erbium Pentaphosphate Monocrystal
Autorzy:
Kaczmarek, F.
Malak, H.
Powiązania:
https://bibliotekanauki.pl/articles/1945416.pdf
Data publikacji:
1996-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.47.+p
78.55.Hx
42.70.Hj
Opis:
Lifetime of the main fluorescence level, $\text{}^{4}$S $\text{}_{3}\text{}_{/}\text{}_{2}$ , of erbium pentaphosphate monocrystal was measured to be 380±20 ns. Direct excitation to higher energy levels, and also indirect excitation with the use of an infrared beam were applied.
Źródło:
Acta Physica Polonica A; 1996, 89, 5-6; 669-674
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 27

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