Abstract
It is shown that application of B2O3 as a flux allows one to obtain nominally pure composition-homogeneous LiNbO3 crystals characterized by high, close-to-stoichiometry ordering of structural units of the cation sublattice and high resistance to laser radiation. It have been established by calculations that boron can be incorporated into faces of oxygen tetrahedra of the LiNbO3 crystal structure. Trace amounts of boron in the LiNbO3:B crystal structure suppress to a great extent the formation of NbLi point defects. At the same time, boron distorts significantly the oxygen framework of the LiNbO3 crystal structure and thus changes the polarizability of oxygen octahedra, which determines the nonlinear optical properties of the crystal.
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Notes
The coercive-field strength is ~3 kV/mm for a stoichiometric LiNbO3 crystal and ~223 kV/mm for a congruent crystal.
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Funding
This study was supported by the Ministry of Science and Higher Education of the Russian Federation within research subject no. 0226-2019-0038 (registration no. AAAA-A18-118022190125-2) and the Russian Foundation for Basic Research, project no. 19-33-90025-Postgraduates.
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Titov, R.A., Voskresenskiy, V.M., Sidorov, N.V. et al. Structural Features and Optical Properties of Nominally Pure LiNbO3 Crystals Grown from a Charge Containing B2O3 . Tech. Phys. 66, 59–66 (2021). https://doi.org/10.1134/S1063784221010217
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DOI: https://doi.org/10.1134/S1063784221010217