The polarized absorption spectra of Tm 3+ ions in LiNbO 3 and LiNbO 3 (MgO) crystals, at 20 K, are presented. The Stark levels of the different multiplets up to 28000 cm -1 are identified. The results are consistent with C 3 symmetry for the rare-earth ions and a singlet (A) character for the lower Stark level of the ground state. Several transitions show additional structure, which indicates multi-site occupancy for the Tm 3+ ions. The effect of MgO codoping which includes the appearance of new absorption bands, is also discussed.
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Núñez et al. (1993) studied this question.
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