(Up) As-grown LiTbF4 (a) and TbCaF (b) single crystals. (Down) Cut and polished  oriented LiTbF4 and TbCaF disks used for the optical measurements.
Coordination polyhedra of Tb3+ in (a) LiTbF4 and (b) TbCaF single crystals.
UV-VIS (a) and near IR (b) polarized absorption spectra of LiTbF4.
UV-VIS-IR averaged absorption cross section of LiTbF4 and TbCaF.
RT and LT emission spectra of Tb3+ in (a) LiTbF4 and (b) TbCaF.
Measured and calculated emission cross-sections of the 5D4 →7F6 transition in LiTbF4 and TbCaF for ((a) and (c)) and ((b) and (d)) polarization.
RT and LT time-resolved luminescence of the Tb3+ 5D4 → 7F5 transition after pulsed excitation at 355 nm for LiTbF4 and TbCaF. Lifetimes were estimated by fitting single exponential decay curves.
Energy level diagram indicating excitation and emission transitions of Tb3+ in LiTbF4. Comparison between RT and LT spectra: (a) excitation in the5D4 multiplet ( = 544.5 nm), and(b)–(h) visible emissions 5D4 → 7FJ ( = 368 nm).
Raman spectra of LiTbF4 and TbCaF at RT.
Sellmeier coefficients for the ordinary (no ) and extraordinary (ne ) refractive indices of LiTbF4 and TbCaF.
Measured and calculated average absorption line strengths at RT for Tb3+ in LiTbF4 and TbCaF. Derived JO parameters Ω t and root mean square deviations δ.
Calculated line strengths, transition probabilities, and branching ratios of Tb3+ in LiTbF4 and TbCaF.
Stark energy levels of Tb3+ in LiTbF4.
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