Abstract
The optical properties of -doped lead germanate glass of composition (in mol. %) have been investigated for several concentrations at various temperatures by steady-state and time-resolved laser spectroscopy. Judd–Ofelt parameters were derived from the absorption spectrum and used to calculate the stimulated-emission cross section and the radiative lifetime. The spectral features of the time-resolved fluorescence line narrowing emission spectra obtained under resonant excitation reveal the existence of spectral migration of excitation among the ions. Analysis of the time evolution of the narrowed emission showed that the electronic mechanism responsible for the ion–ion interaction can be identified as a dipole–dipole energy-transfer process. Green, orange, and red emissions were observed in this glass under continuous-wave infrared laser excitation and are attributed to transitions from the level.
© 2000 Optical Society of America
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