Abstract
Holmium-doped titanate-germanate glasses have been investigated for optical applications. Near-infrared luminescence at 2 μm due to 5I7 → 5I8 transition of holmium ions has been examined in function of TiO2 concentration. Several spectroscopic parameters for holmium ions such as emission linewidth and lifetime, stimulated emission cross-section and quantum efficiency were determined based on absorption and luminescence experiments and calculated using the Judd-Ofelt theory. Systematic studies demonstrate that holmium-doped titanate-germanate glasses with higher TiO2 concentration show excellent optical properties. Multicomponent glasses with molar ratios GeO2:TiO2 = 1:2 and 1:3 are recommended for near-infrared luminescence at 2 μm.
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