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Resonant excited state absorption and relaxation mechanisms in Tb^3+-doped calcium aluminosilicate glasses: an investigation by thermal mirror spectroscopy

2013; Optica Publishing Group; Volume: 38; Issue: 22 Linguagem: Inglês

10.1364/ol.38.004667

1539-4794

G. Bianchi, Vitor Santaella Zanuto, F. B. G. Astrath, L. C. Malacarne, Idelma A. A. Terra, T. Catunda, L. A. O. Nunes, Carlos Jacinto, L.H.C. Andrade, S. M. Lima, Mauro Luciano Baesso, Nelson G. C. Astrath,

Photorefractive and Nonlinear Optics

Resonant excited state absorption (ESA) and relaxation processes in Tb(3+)-doped aluminosilicate glasses are quantitatively evaluated. A model describing the excitation steps and upconversion emission is developed and applied to interpret the results from laser-induced surface deformation using thermal mirror spectroscopy. The fluorescence quantum efficiency of level (5)D(4) was found to be close to unity and concentration independent while, for the level (5)D(3), it decreases with Tb(3+) concentration. Emission spectroscopy measurements supported these results. ESA cross sections are found to be more than three orders of magnitude higher than the ground state absorption cross section.