scholarly journals Влияние способа сильного легирования на композиционную однородность и оптические свойства монокристаллов LiNbO-=SUB=-3-=/SUB=- : Mg

2022 ◽  
Vol 130 (1) ◽  
pp. 184
Author(s):  
Н.В. Сидоров ◽  
Н.А. Теплякова ◽  
М.Н. Палатников
Keyword(s):  
Raman Spectroscopy ◽  
Light Scattering ◽  
Threshold Value ◽  
Magnesium Concentration ◽  
Direct Addition ◽  
Photoinduced Light Scattering ◽  
Heavily Doped ◽  
A Charge ◽  
Laser Conoscopy ◽  
Spectroscopy Laser

Raman spectroscopy, laser conoscopy and photoinduced light scattering methods have been applied to comparatively study composition uniformity of strongly doped LiNbO3 crystals with a magnesium concentration close to a threshold value ≈5 mol% MgО, grown from a charge synthesized using precursor Nb2O5:Mg (homogeneous doping method) and at direct addition of magnesium to the melt (direct doping method). It has been shown that application of homogeneous doping method allows one to obtain compositionally more homogeneous heavily doped LiNbO3:Mg crystal than direct melt doping method.

scholarly journals INFLUENCE OF THE METHOD OF DOPING ON UNIFORMITY AND OPTICAL PROPERTIES OF LiNbO:Mg CRYSTALS

2021 ◽  
pp. 383-391
Author(s):  
Николай Васильевич Сидоров ◽  
Наталья Александровна Теплякова ◽  
Михаил Николаевич Палатников
Keyword(s):  
Raman Spectroscopy ◽  
Optical Properties ◽  
Magnesium Concentration ◽  
Octahedral Structure ◽  
Precursor Synthesis ◽  
Domain State ◽  
Compositional Homogeneity ◽  
Heavily Doped ◽  
A Charge ◽  
Laser Conoscopy

Представлены результаты сравнительных комплексных исследований методами спектроскопии комбинационного рассеяния света и лазерной коноскопии композиционной однородности и некоторых оптических свойства близких по составу сильно легированных монодоменизированных кристаллов LiNbO: Mg (5,03 мол. % MgO и LiNbO: Mg (4,75 мол. % MgO), с концентрацией магния, близкой к пороговому значению ≈ 5 мол. % MgO, выращенных из шихты, синтезированной с использованием прекурсора NbO : Mg (метод гомогенного легирования), а также выращенных при непосредственном добавлении магния в расплав (метод прямого легирования). Показано, что методом гомогенного легирования с использованием прекурсора NbO : Mg можно получать отличающиеся низким коэрцитивным полем более композиционно однородные сильно легированные монокристаллы LiNbO : Mg, чем методом прямого легирования расплава магнием. При этом более однородное распределение легирующей добавки в кристаллах гомогенного легирования начинает формироваться уже на стадии синтеза прекурсора NbO : Mg и шихты ниобата лития при формировании химически активных комплексов, определяющих преимущественно кислородно-октаэдрическую структуру прекурсора NbO : Mg. The paper considers results for strongly doped turned to a single domain state crystals LiNbO: Mg (5,03 mol % MgO and LiNbO: Mg (4,75 mol % MgO). Magnesium concentration in these crystals is close to each other and to threshold ≈ 5 mol % MgO . Crystals were grown from a charge synthesized using precursor LiNbO: Mg (homogeneous doping method) and from a charge obtained at a direct addition of magnesium to the charge (direct doping method). Complex studies were carried out by Raman spectroscopy and laser conoscopy. Compositional homogeneity and some optical properties of studied crystals are considered. Homogeneous doping with precursor NbO: Mg method allows us to obtain heavily doped LiNbO: Mg single crystals with low coercive field and more compositionally homogeneous than method of direct melt doping with magnesium. In this case, a more uniform distribution of the dopant in homogeneously doped crystals begins to form at the stage of NbO: Mg precursor synthesis during the formation of chemically active complexes that predominantly determine the oxygen-octahedral structure of the NbO: Mg precursor.

scholarly journals Structural particularities and optical properties of lithium niobate single crystals grown from the charge doped by boron.

2020 ◽  
Vol 11 (3-2020) ◽  
pp. 189-195
Author(s):  
R. A. Titov ◽  
◽  
N. V. Sidorov ◽  
N. A. Teplyakova ◽  
M. N. Palatnikov ◽  
...  
Keyword(s):  
Optical Properties ◽  
Light Scattering ◽  
Lithium Niobate ◽  
Distribution Coefficient ◽  
Single Crystals ◽  
Infrared Absorption ◽  
Cation Sublattice ◽  
Structural Units ◽  
Photoinduced Light Scattering ◽  
Laser Conoscopy

The analysis of structural particularities and optical properties of LiNbO3 : B (0,55, 0,69 and 0,83 mol. % B2O3) was performed by methods of Raman and photoinduced light scattering, infrared absorption and laser conoscopy. It has been established that the boron impurity brings to 1 the distribution coefficient of lithium and niobium in the growing process. Thus, LiNbO3: B crystals grown from a congruent melt approach the stoichiometric crystals in ordering the structural units of the cation sublattice and the Li / Nb ratio.

Anisotropy of photoinduced light-scattering in glassy As2S3

1993 ◽  
Vol 164-166 ◽  
pp. 1165-1168 ◽  
Author(s):  
V. Lyubin ◽  
M. Klebanov ◽  
S. Rosenwaks ◽  
V. Volterra
Keyword(s):  
Light Scattering ◽  
Photoinduced Light Scattering

Photoinduced light scattering in cerium-doped barium strontium niobate crystals

1980 ◽  
Vol 10 (11) ◽  
pp. 1346-1349 ◽  
Author(s):  
Valerii V Voronov ◽  
I R Dorosh ◽  
Yu S Kuz'minov ◽  
N V Tkachenko
Keyword(s):  
Light Scattering ◽  
Barium Strontium ◽  
Photoinduced Light Scattering

Photoinduced light scattering in LiNbO3:Rh crystals

2004 ◽  
Vol 71 (9) ◽  
pp. 570 ◽  
Author(s):  
Yu. M. Karpets ◽  
V. A. Maksimenko
Keyword(s):  
Light Scattering ◽  
Photoinduced Light Scattering

Graphene Layers on Silicon Carbide Studied by Raman Spectroscopy

2008 ◽  
Vol 600-603 ◽  
pp. 567-570 ◽  
Author(s):  
Jonas Röhrl ◽  
Martin Hundhausen ◽  
Konstantin V. Emtsev ◽  
Thomas Seyller ◽  
Lothar Ley
Keyword(s):  
Silicon Carbide ◽  
Raman Spectroscopy ◽  
Light Scattering ◽  
Graphene Layer ◽  
Monolayer Graphene ◽  
Spectroscopy Study ◽  
Graphene Layers ◽  
Layer Graphene ◽  
Micro Raman Spectroscopy ◽  
Few Layer Graphene

We present a micro-Raman spectroscopy study on single- and few layer graphene (FLG) grown on the silicon terminated surface of 6H-silicon carbide (SiC). On the basis of the 2D-line (light scattering from two phonons close to the K-point in the Brillouin zone) we distinguish graphene mono- from bilayers or few layer graphene. Monolayers have a 2D-line consisting of only one component, whereas more than one component is observed for thicker graphene layers. Compared to the graphite the monolayer graphene lines are shifted to higher frequencies. We tentatively ascribe the corresponding phonon hardening to strain in the first graphene layer.

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