Abstract
Resonant excited state absorption (ESA) and relaxation processes in -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 was found to be close to unity and concentration independent while, for the level , it decreases with 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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