Concentration threshold in optically nonlinear LiNbO3:Tb crystals

Палатников, М. Н.; Сидоров, Н. В.; Kadetova, A. V.; Teplyakova, N. А.; Макарова, О. В.; Manukovskaya, D. V.

doi:10.1016/j.optlastec.2020.106821

Cited by 12 publications

(5 citation statements)

References 17 publications

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“…Data from Table 4 indicate that despite the doping type, LiNbO 3 :B crystals have such point defects as niobium cations located in lithium (Nb Li ) and vacant (Nb V ) oxygen octahedra O 6 of a perfect stoichiometric LN structure. The technique for analyzing the defect structure using full-profile XRD analysis (the Rietveld method) and the general logic of reasoning are described in the works [ 22 , 23 , 33 ].…”

Section: Resultsmentioning

confidence: 99%

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Growing, Structure and Optical Properties of LiNbO3:B Crystals, a Material for Laser Radiation Transformation

et al. 2023

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Physical and chemical properties have been studied in lithium niobate (LiNbO3, LN) crystals grown by Czochralski from a boron doped melt. Optical uniformity and optical damage resistance of LiNbO3:B crystals have been compared with control crystals of nominally pure congruent (CLN) and near-stoichiometric (NSLN K2O) composition. LiNbO3:В crystals structure has been studied. Studied LiNbO3:В crystals have been grown from differently synthesized charges. The charges have been synthesized from a mixture Nb2O5:B-Li2CO3 using homogeneously doped Nb2O5:B precursor (sample 1, (B) = 0.0034 wt% in the charge) and by a direct solid phase synthesis from Nb2O5-Li2CO3-H3BO3 mixture (sample 2, (B) = 0.0079 wt% in the charge). Only traces of boron (10−5–10−4 wt%) have been detected in the samples. We have established that concentration of anti-site defects NbLi is lower in both LiNbO3:B than in CLN crystals. XRD analysis has confirmed that В3+ cations localize in faces of tetrahedral voids О4 of LN structure. The voids act as buffers at the anion sublattice distortion. Sample 1 has been shown to have a structure closer to NSLN K2O crystal than sample 2. We have also shown that the chemical purity of LN crystal increases compared to the melt purity because boron creates strong compounds with impurities in the melt system Li2O-Nb2O5-B2O3. Metals impurities thus stay in the melt and do not transfer to the crystal.

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Section: Resultsmentioning

confidence: 99%

“…The laser radiation intensity was I = 6.29 W/cm 2 . The obtaining details of PILS patterns were similar to the method described in [ 22 ].…”

Section: Methodsmentioning

confidence: 99%

Growing, Structure and Optical Properties of LiNbO3:B Crystals, a Material for Laser Radiation Transformation

et al. 2023

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“…The design of the thermal unit was similar to the design used in [ 52 ]. Figure 1 b shows samples of LiNbO 3 :B:Mg crystals grown from a charge obtained via SP and HG doping.…”

Section: Methodsmentioning

confidence: 99%

“…The conoscopic patterns were recorded on a translucent screen with a digital camera. A more detailed description of the methods for studying PILS and laser conoscopy in widely diverging laser beams, as well as block diagrams of the experimental setups, are presented in [ 52 ].…”

Section: Methodsmentioning

confidence: 99%

“…The crystals were grown in a growth facility, a Kristall-2 (Voroshilovgradsky zavod electronnogo mashinostroeniya, Voroshilovgrad, USSR) equipped with an automatic crystal diameter control system, Figure 1a. The design of the thermal unit was similar to the design used in [52]. Figure 1b shows samples of LiNbO 3 :B:Mg crystals grown from a charge obtained via SP and HG doping.…”

Section: Methodsmentioning

confidence: 99%

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Structure, Optical Properties and Physicochemical Features of LiNbO3:Mg,B Crystals Grown in a Single Technological Cycle: An Optical Material for Converting Laser Radiation

et al. 2023

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Two series of LiNbO3:Mg:B crystals have been grown and studied. Two doping methods—have been used. The crystals—have been co-doped with Mg and a non-metallic dopant, B. The physicochemical features of the growth—have been considered for LiNbO3:Mg:B crystals obtained from a boron-doped melt. The charge—has been prepared using different technologies: homogeneous (HG) and solid-phase (SP) doping. The same two methods have been used to grow single-doped LiNbO3:Mg crystals. A control near-stoichiometric (NSLN) crystal—has been grown via the HTTSSG (high-temperature top-seeded solution growth) method from a congruent melt (Li/Nb ≈ 0.946) with 5.5 wt% K2O. The characteristics of the LiNbO3:Mg:B crystals—have been compared with those of the LiNbO3:Mg and NSLN crystals. Physicochemical and structural reasons have been established for the differences in the distribution coefficients of magnesium (KD) during the growth of the HG- and SP-doped LiNbO3:B:Mg and LiNbO3:Mg crystals. The optical characteristics of the LiNbO3:B:Mg crystals—have been studied via optical spectroscopy, laser conoscopy and photoinduced light scattering (PILS). The influence of boron on the microstructure, compositional and optical uniformities and optical damage resistance of the LiNbO3:Mg:B crystals—has been estimated. Optimal technological approaches to growing optically uniform LiNbO3:B:Mg crystals have been determined. LiNbO3:Mg:B crystals have been shown to have a significant advantage over the commercially used LiNbO3:Mg crystals since large LiNbO3:Mg:B crystals can be grown without stripes. Such stripes usually appear perpendicular to the growth axis. In addition, the photorefractive effect is suppressed in LiNbO3:Mg:B crystals at lower magnesium concentrations ([Mg] ≈ 2.5 mol%) than in LiNbO3:Mg ([Mg] ≈ 5.5 mol%).

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Growth of heavily doped LiNbO3:Ce crystals, their physicochemical and optical characteristics and defect structure

Palatnikov,

Tokko,

Kadetova

et al. 2024

Journal of Solid State Chemistry

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Concentration threshold in optically nonlinear LiNbO3:Tb crystals

Cited by 12 publications

References 17 publications

Growing, Structure and Optical Properties of LiNbO3:B Crystals, a Material for Laser Radiation Transformation

Growing, Structure and Optical Properties of LiNbO3:B Crystals, a Material for Laser Radiation Transformation

Structure, Optical Properties and Physicochemical Features of LiNbO3:Mg,B Crystals Grown in a Single Technological Cycle: An Optical Material for Converting Laser Radiation

Growth of heavily doped LiNbO3:Ce crystals, their physicochemical and optical characteristics and defect structure

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