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Issue 11, 2024
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Accepted articles
Reviews of topical problems


Manifestation of defects and imperfections of lithium niobate crystals in Raman spectra

, ,
Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials of the Russian Academy of Sciences Kola Science Center, Akademgorodok str. 26a, Apatity, Murmansk Region, 184209, Russian Federation

The main reasons for the appearance of low-intensity "extra" bands (not corresponding to fundamental lattice vibrations) in the Raman spectrum of nonstoichiometric nonlinear optical LiNbO3 crystals are discussed in the review. These bands arise due to the formation in the crystal of two-particle states of acoustic vibrations with a total wave vector equal to zero, strong anharmonicity of fundamental vibrations and the presence of microstructures (clusters). The structure of the latter differs from the structure of the crystalline matrix. The presence of microinclusions of impurity phases of other lithium niobates and the effect of photorefraction play a role in the appearance of "extra" bands. It has been shown that "extra" bands of the Raman spectrum can serve as a new highly sensitive tool for studying the structural perfection of LiNbO3 crystals.

Keywords: lithium niobate, single crystal, Raman spectroscopy, defects, "extra" bands, laser conoscopy, photoinduced light scattering
PACS: 33.20.Fb, 42.70.−a, 42.70.Mp, 61.72.−y (all)
DOI: 10.3367/UFNe.2024.11.039806
Citation: Sidorov N V, Teplyakova N A, Palatnikov M N "Manifestation of defects and imperfections of lithium niobate crystals in Raman spectra" Phys. Usp., accepted

Received: 19th, March 2024, revised: 20th, June 2024, 13th, November 2024

Оригинал: Сидоров Н В, Теплякова Н А, Палатников М Н «Проявление дефектов и несовершенств кристаллов ниобата лития в спектрах комбинационного рассеяния света» УФН, принята к публикации; DOI: 10.3367/UFNr.2024.11.039806

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