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Bismuth tellurite Bi2TeO5 (BTO) is a photorefractive crystal with special capability of self-fixing hologram recording. Single crystals of BTO:Tb were grown by the Czochralski technique. Five infrared transitions were identified and analyzed in the high resolution absorption spectra from the 7F6 ground state to the 7F4, 7F3, 7F2, 7F1, and 7F0 manifolds together with their Stark components. The features of the Tb3+ transitions are in accordance with the single site Tb substitution to one of the slightly different Bi-site.

Tb3+ doped single crystals of huntite-type YAl3(BO3)4 (YAB) have been characterized by means of Fourier transform absorption spectroscopy in the wave number range 500-25000 cm[?]1 and in the temperature range 9-300 K, and by means of 9 K linear dichroism measurements. Crystal-field splitting of the fundamental 7F6 and of the excited 7F5, 7F4, 7F3, 7F2, 7F1, 7F0, and 5D4 manifolds of Tb3+ have been analyzed and fitted within a single ion Hamiltonian model, to obtain free-ion and crystal-field parameters. The electron-phonon interaction has been put into evidence by thermally induced line shift and discussed in the framework of a single phonon coupling model.