Integrated research of structural and optical homogeneities of the lithium niobate crystal with low photorefractive effect

Sidorov, N. V.; Крук, А. А.; Pikoul, O. Yu.; Палатников, М. Н.; Teplyakova, N. А.; Yanichev, A. A.; Макарова, О. В.

doi:10.1016/j.ijleo.2015.03.018

Cited by 19 publications

(12 citation statements)

References 21 publications

(59 reference statements)

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“…Such a crystal The E(TO) 580 cm −1 band does not change with changes in photorefractive effect value, at least in crystals with a low photorefractive effect. Thus, photorefractive effect can be evaluated due to the formula I rel = (I 630 /I 580 ) × 100% [11,13,44,45]. Structure disorder contributes the most to LN Raman bands widening during dopant concentration increase at a constant temperature [2,43].…”

Section: Study Of Linbo 3 :B Crystals Defective Structure By Raman Sp...mentioning

confidence: 99%

Boron Influence on Defect Structure and Properties of Lithium Niobate Crystals

et al. 2021

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Defect structure of nominally pure lithium niobate crystals grown from a boron doped charge have been studied by Raman and optical spectroscopy, laser conoscopy, and photoinduced light scattering. An influence of boron dopant on optical uniformity, photoelectrical fields values, and band gap have been also studied by these methods in LiNbO3 crystals. Despite a high concentration of boron in the charge (up to 2 mol%), content in the crystal does not exceed 10−4 wt%. We have calculated that boron incorporates only into tetrahedral voids of crystal structure as a part of groups [BO3]3−, which changes O–O bonds lengths in O6 octahedra. At this oxygen–metal clusters MeO6 (Me: Li, Nb) change their polarizability. The clusters determine optically nonlinear and ferroelectric properties of a crystal. Chemical interactions in the system Li2O–Nb2O5–B2O3 have been considered. Boron, being an active element, structures lithium niobate melt, which significantly influences defect structure and physical properties of a crystal grown from such a melt. At the same time, amount of defects NbLi and concentration of OH groups in LiNbO3:B is close to that in stoichiometric crystals; photorefractive effect, optical, and compositional uniformity on the contrary is higher.

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Section: Study Of Linbo 3 :B Crystals Defective Structure By Raman Sp...mentioning

confidence: 99%

Boron Influence on Defect Structure and Properties of Lithium Niobate Crystals

et al. 2021

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“…Relative intensity I rel = I 630 / I 580 ·100% is used for the evaluation. The intensity of the band 580 cm −1 E(TO) stays unchanged for all lithium niobate crystals with low photorefractive effect at change of Li/Nb ratio and doping …”

Section: Resultsmentioning

confidence: 97%

Concentration threshold effect on properties of zinc‐doped lithium niobate crystals

Палатников¹,

Сидоров²,

Макарова³

et al. 2017

J Am Ceram Soc

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Results of LiNbO 3 :Zn researches often diverge because sharp changes in physicochemical characteristics of the system melt-crystal that occur at doping are usually not taken into consideration. When a series of doped crystals is grown Zn is usually added to the melt with step 1.5-2 mol%. This obstructs detection of exact threshold concentration. We have grown LiNbO 3 :Zn crystals doped by 4.0Ä9.0 mol% ZnO with step~1 mol%. Around the dopant, threshold concentration step was narrowed to~0.1 mol%. We have researched physicochemical properties of the system meltcrystal and structure evolution by Raman spectroscopy and full-profile analysis of XRD. We have detected exact threshold concentration for LiNbO 3 :Zn and concluded that crystals doped by prethreshold concentrations of ZnO are the best for most applications because of the higher optical homogeneity. K E Y W O R D S doping, lithium niobate, single crystals How to cite this article: Palatnikov MN, Sidorov NV, Makarova OV, Manukovskaya DV, Aljoshina LA, Kadetova AV. Concentration threshold effect on properties of zinc-doped lithium niobate crystals. J

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“…The strongest decrease in photorefraction and coercive field in a LiNbO3 crystal occurs abruptly, when the "threshold" values of the concentrations of "nonphotorefractive" dopants Zn, Mg, etc. are exceeded [5,6]. Moreover, in the region of concentration thresholds, pronounced anomalies of the structure and many physical parameters of the crystal are observed.…”

Section: Introductionmentioning

confidence: 99%

“…Laser conoscopy has acquired particular information for the investigation of subtle structural distortions, both intrinsic and induced by laser radiation in photorefractive nonlinear optical crystals. It has become possible to use laser conoscopy to study the fine features of the structure, the effect of photorefraction, nonlinear optical effects in combination with other research methods: Raman light scattering, photoinduced (photorefractive) light scattering (FIRS), electron spectroscopy, etc., substantially supplementing the data of these methods [3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Visualization of Optical Uniformity Alloyed Single Crystals of Lithium Niobate

Pikoul

Сидоров

Teplyakova

et al. 2020

SSP

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It was shown that laser conoscopy can visually detect even slight changes in the optical characteristics of a crystal when it is doped. It has been found that the defective structure of LiNbO3:Zn (4.5 mol. %), LiNbO3:Mg (3.0–5.5 mol.%) crystals associated with an uneven entry of an impurity leads to a local change in the elastic characteristics of the crystal and the appearance of mechanical stresses that distort the conoscopic patterns. This can be an abnormal optical biaxiality, which manifests itself in the form of a rupture and enlightenment of the "Maltese cross" in the center of the conoscopic crystal pattern, or local birefringent inclusions that are recorded as additional interference patterns against the background of the main conoscopic pattern, both in the center of the field of view and in its peripheral area.

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Integrated research of structural and optical homogeneities of the lithium niobate crystal with low photorefractive effect

Cited by 19 publications

References 21 publications

Boron Influence on Defect Structure and Properties of Lithium Niobate Crystals

Boron Influence on Defect Structure and Properties of Lithium Niobate Crystals

Concentration threshold effect on properties of zinc‐doped lithium niobate crystals

Visualization of Optical Uniformity Alloyed Single Crystals of Lithium Niobate

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