Abstract
Using polarized laser selective excitation, sets of energy levels have been established for the principal new Pr3+ centers in four mixed alkaline earth fluoride systems: CaF2:Pr3+ containing up to 1% of either SrF2 or BaF2 and SrF2:Pr3+ containing up to 1% of either CaF2 or BaF2. The three principal centers for SrF2 in CaF2:Pr3+ are modified centers derived from the tetragonal C4v symmetry center of the parent crystal: two with an off-axis Sr2+ ion and one with an on-axis Sr2+ ion. Fluorescence lifetimes determined for mixed crystal centers are reported and related to their respective Pr3+ energy level patterns. Some results of high resolution scans of the respective absorption transitions of these centers are also presented.
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