Abstract
In this work, we report the 2.05μm emission and ∼3μm broadband spectra of Ho2O3-doped 33GeO2–30TeO2–27PbO–10CaO (in mol%) glass under 640nm laser excitation. Clear emission spectra due to the 5I7–5I8 transition and the 5I6–5I7 transition in Ho3+ are observed. The 2.05μm emission intensity and the full width at half maximum (FWHM) of the ∼3μm broadband depend on the Ho concentration. The peak stimulated emission cross-section of Ho3+ is 6.57×10−21cm2 at 2.05μm, as calculated by the McCumber theory. The emission spectra are recorded and the maximum emission intensity at 2.05μm is obtained at a doping level of 0.5mol% Ho2O3 in the glass. A broad and flat emission band from 2700nm to 3050nm is observed in 2mol% Ho2O3-doped tellurium germanate glass. The lifetime of the 5I7 state decreases with the increase in Ho3+ concentration due to non-radiative relaxation processes. An energy transfer coefficient of 271.88mol−1s−1 is obtained.
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