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Wyszukujesz frazę "42.70.Hj" wg kryterium: Temat


Wyświetlanie 1-5 z 5
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:
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:
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:
Development of Growth Technologies for the Photonic Single Crystals by the Czochralski Method at Institute for Single Crystals, NAS of Ukraine
Autorzy:
Kosmyna, M.
Nazarenko, B.
Puzikov, V.
Shekhovtsov, A.
Powiązania:
https://bibliotekanauki.pl/articles/1399466.pdf
Data publikacji:
2013-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.10.Fq
42.70.Hj
42.70.Mp
29.40.Mc
Opis:
The present paper briefly overviews the application of the Czochralski method for growth of a set of oxide crystals for photonics, as well as the design of equipment at the Institute for Single Crystals, NAS of Ukraine. The examples of crystal growth and their characterization are described. The simultaneous Q-switched lasing and self-Raman frequency conversion were demonstrated in Nd-doped $PbWO_4$ and $PbMoO_4$ crystals grown by the Czochralski method. The slope lasing efficiency obtained for a $PbMoO_4:Nd^{3+}$ laser is the best result for all the crystals with the scheelite-type structure. A detection unit with high scintillation characteristics based on a large volume (V ≈ 350 cm^3) $CdWO_4$ crystal was produced. Crystal growth procedures and properties of new double tungstate and vanadate crystals are presented, too.
Źródło:
Acta Physica Polonica A; 2013, 124, 2; 305-313
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distribution of $Pb^{2+}$ Ions in $PbF_{2}$-Doped $CaF_{2}$ Crystals
Autorzy:
Paraschiva, M.
Nicoara, I.
Stef, M.
Bunoiu, O.
Powiązania:
https://bibliotekanauki.pl/articles/1538667.pdf
Data publikacji:
2010-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Hj
68.35.Dv
78.20.Ci
78.40.Ha
81.10.Fq
Opis:
Calcium fluoride crystals doped with various concentrations of $PbF_{2}$ have been grown using the Bridgman technique. The optical absorption spectra reveal the characteristic UV absorption bands of the $Pb^{2+}$ ions. The distribution of the $Pb^{2+}$-ions along four crystals has been investigated using the optical absorption method. Taking into account the relationship between the optical absorption coefficient and the concentration of the impurities in the samples, the effective segregation coefficient of the $Pb^{2+}$ ions has been calculated. Our study shows that the effective segregation coefficient of the $Pb^{2+}$ ions in $CaF_{2}$ host depends on the dopant concentration, and varies between 0.85 and 1.15, for 0.5 mol%$PbF_{2}$ and 3 mol%$PbF_{2}$-doped $CaF_{2}$, respectively.
Źródło:
Acta Physica Polonica A; 2010, 117, 3; 466-470
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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