Abstract
Nd3+ doped SrF2 and CaF2 transparent ceramics were fabricated by vacuum hot-press sintering and the absorption spectra, emission spectra as well as luminescence decays of the samples were measured. Judd-Ofelt (J–O) theory was used to analyze the optical performance of Nd3+ in these two isostructural hosts. The Nd: SrF2 transparent ceramic was found to have smaller line strength, larger radiative lifetime and smaller Ω2 value (corresponding to more ionic Nd3+-ligand bonding and more symmetry of Nd3+ environment). These features made it easier for Nd: SrF2 to realize population inversion and strong emission, thus doing good to laser performance. The strong emission of 4F3/2 → 4I9/2 transition in Nd: SrF2, which was predicted by J–O theory and demonstrated by luminescence spectrum, made it possible to achieve effective laser output around 900 nm. The intensity parameters and radiative lifetimes of ceramics were found comparable with their corresponding single crystals.
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