A brief review of recent studies of crystals doped with rare-earth ions performed at the Institute of Spectroscopy of the Russian Academy of Sciences (ISAN) using high-resolution wide-range optical Fourier spectroscopy is presented. The results of a study of inhomogeneous broadening and the fine structure of lines in the absorption and luminescence spectra of crystals with rare-earth ions caused by random deformations, the isotopic structure in luminescence spectra associated with matrix isotopes, and anticrossings of the crystal hyperfine levels in a magnetic field are discussed. It is shown that the hyperfine structure in luminescence spectra can be used to implement a luminescence thermometer for the region of ultra-low temperatures.

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Keywords: spectra of crystals with rare-earth ions, deformation splittings, hyperfine structure, level anticrossings, photoluminescence, high-resolution Fourier spectroscopy, luminescence cryothermometer PACS: 71.70.−d, 78.20.Bh, 78.40.Ha, 78.55.Hx, 78.90.+t (all) DOI: 10.3367/UFNe.2024.07.039714 URL: https://ufn.ru/en/articles/2024/11/f/ Citation: Popova M N, Diab M, Boldyrev K N "High-resolution spectroscopy of functional dielectrics with rare-earth ions" Phys. Usp. 67 (11) (2024) Received: 11th, March 2024, revised: 3rd, July 2024, accepted: 11th, July 2024 Оригинал: Попова М Н, Диаб М, Болдырев К Н «Спектроскопия высокого разрешения функциональных диэлектриков с редкоземельными ионами» УФН 194 1177–1184 (2024); DOI: 10.3367/UFNr.2024.07.039714