Abstract

A brief description of the basic spectroscopic properties of Tm3+-doped 20Ge-5Ga-10Sb-65S (GeGaSbS) glass is presented. Spontaneous-emission probabilities, radiative lifetimes, branching ratios, and quantum efficiency of Tm3+ in GeGaSbS glass are evaluated by use of Judd–Ofelt theory. Lifetime measurements are carried out at room and low temperatures. A large difference of the lifetime values occurs between the theoretical and experimental results. McCumber and Ladenburg–Funchtbauer techniques are used for the emission cross-section determinations. Discrepancies appear between these two techniques. Hypotheses about the presence of the diffusion-limited relaxation process are applied for explanations.

© 2006 Optical Society of America

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