Abstract

Resonant excited state absorption (ESA) and relaxation processes in ${\mathrm{Tb}}^{3+}$-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 ${\mathrm{Tb}}^{3+}$ 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.

© 2013 Optical Society of America

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