https://doi.org/10.1140/epjp/s13360-024-05754-3
Regular Article
Spectroscopic studies of Tm-doped CaF2 single-crystal
Department of Physics, Guru Jambheshwar University of Science & Technology, Hisar, Haryana, India
Received:
10
June
2024
Accepted:
17
October
2024
Published online:
1
November
2024
Thulium-doped CaF2 single crystal has been investigated in detail for its optical absorption, Raman spectra, and fluorescence spectra. The cubic structure of Tm: CaF2 has been confirmed using a single-crystal XRD investigation. Seven absorption transitions spanning 300–2000 nm corresponding to 4f–4f transitions of Tm3+ ions have been identified in the absorption spectra. Three Judd–Ofelt (JO) parameters are estimated by fitting the measured and predicted transition strengths using least-square fitting. The Calculated optimal values of JO parameters are Ω2 = 0.34, Ω4 = 0.54, Ω6 = 1.37 in 10−20 cm2 units. A lower value of Ω2, which is sensitive to the local environment, suggests a stronger ionic bond in fluorite structures doped with rare earth elements, as a result of charge compensation with interstitial F − anions. Using JO parameters, we have found the transition probabilities, which is then used to determine the radiative lifetimes of the primary emitting levels and the branching ratios of respective transitions. There are four distinct bands in the Tm3+-CaF2 emission profile namely: 1D2 → 3F4 (451 nm), 1G4 → 3H6 (477 nm) excited by a 356 nm wavelength, another 3F2,3 → 3H6 (690 nm) excited by a 461 nm wavelength, and 3H4 → 3H6 (822 nm) excited by a 675 nm wavelength.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
