Abstract—
We have found conditions for high-speed measurements of Raman spectra of lithium niobate and lithium tantalate single crystals and ceramics. To measure Raman spectra, we used 180° scattering geometry and a minispectrometer equipped with an array detector. The Raman spectra obtained at two distinct orientations of the single crystals relative to the excitation beam direction have been shown to have different frequencies of transverse and longitudinal optical modes. The Raman spectra of the ceramics are mainly contributed by transverse optical modes.
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ACKNOWLEDGMENTS
This work was supported in part by the Russian Foundation for Basic Research, grant nos. 18-02-00181 and 18-32-00259.
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Translated by O. Tsarev
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Gorelik, V.S., Abdurakhmonov, S.D., Sidorov, N.V. et al. Raman Scattering in Lithium Niobate and Lithium Tantalate Single Crystals and Ceramics. Inorg Mater 55, 524–532 (2019). https://doi.org/10.1134/S0020168519050066
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DOI: https://doi.org/10.1134/S0020168519050066