Abstract

The optical properties of Nd3+-doped lead germanate glass of composition (in mol. %) 60GeO225PbO15Nb2O5 have been investigated for several Nd3+ 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  4F3/24I11/2 stimulated-emission cross section and the  4F3/2 radiative lifetime. The spectral features of the time-resolved fluorescence line narrowing  4F3/24I9/2 emission spectra obtained under resonant excitation reveal the existence of spectral migration of excitation among the Nd3+ ions. Analysis of the time evolution of the  4F3/24I9/2 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  4G7/2 level.

© 2000 Optical Society of America

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