Abstract
Optical properties of Tm 3+ ions in indium-based heavy metal fluoride glasses are studied. Absorption and emission spectra are presented as a function of temperature. Radiative transition rates for the excited states are determined by using the Judd-Ofelt theory. Lifetimes are investigated as a function of temperature and rare-earth concentration for the 1G 4 and 3H 4 levels. Cross-relaxation processes are found to be efficient for the 1G 4 level. For the 3H 4 level, energy transfer occurs via a two-phonon one-site resonant process.
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