Abstract
The visible photoluminescence of Tb 3+-doped germanate glass of composition (in mol%) 40GeO 2–20Na 2O–40SiO 2 has been investigated for two Tb 3+ concentrations. By using steady-state and pulsed laser spectroscopy. Concentration effects on luminescence are observed for Tb 3+ concentration higher than 0.9 mol%. The thermo-optical characteristics were measured at room temperature under resonant conditions on the Tb 3 ions. The thermo-optical properties of the glasses showed a dependence on the concentration of terbium ions. The effects of TL were also analyzed in terms of a theoretical model for CW laser induced thermal lensing under a Gaussian-beam approximation. Tb 3+ concentration quenching effects on the dependence of thermo-optical properties are discussed.
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