Spectroscopic study and Judd-Ofelt analysis of Pr3+-doped Zr-Ba-La-Al glasses in visible spectral range.
Résumé
Visible transitions in the blue, green, and red of Pr3+ ions are of interest for laser applications. A description of spectroscopic properties of this rare earth ion in Zr-Ba-La-Al (ZBLA) fluorozirconate glass matrix is presented, using an original approach. Magnetic-dipole and elec.-dipole contributions are calcd., in the context of the Judd-Ofelt theory, to det. the Ωt (t = 2, 4, 6) parameters, lifetime, and branching ratios of 3P0 emitting level. Influence of overlapping transitions and sensitized transitions are discussed, as well as the use of the std. or normalized method. Branching ratios are measured using an exptl. method and compared to theor. ones. The influence of higher energy and thermally populated 3P1 and 1I6 levels on the 3P0 lifetime is also studied. Considering this influence, a good agreement is found between theor. and exptl. 3P0 lifetimes. Finally, emission cross sections are calcd. for the visible transitions, using either the reciprocity method or the Fuchtbauer-Ladenburg formula, for different calcd. Judd-Ofelt parameters, highlighting the ability of Pr3+-doped ZBLA to be used as a laser material. [on SciFinder(R)]