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The foremost limitation of an oxide based crystal or glass host to demonstrate mid- infrared emissions is its high phonon energy. It is very difficult to obtain radiative mid-infrared emissions from these hosts which normally relax non-radiatively between closely spaced energy levels of dopant rare earth ions. In this study, an intense mid-infrared emission around 2.9 μm has been perceived from Ho 3+  ions in Yb 3+ /Ho 3+  co-doped oxide based tellurite glass system. This emission intensity has increased many folds upon Yb 3+ : 985 nm excitation compared to direct Ho 3+  excitations due to efficient excited state resonant energy transfer through Yb 3+ :  2 F 5/2  → Ho 3+ :  5 I 5  levels. The effective bandwidth (FWHM) and cross-section (σ em ) of measured emission at 2.9 μm are assessed to be 180 nm and 9.1 × 10 −21  cm 2  respectively which are comparable to other crystal/glass hosts and even better than ZBLAN fluoride glass host. Hence, this Ho 3+ /Yb 3+  co-doped oxide glass system has immense potential for the development of solid state mid-infrared laser sources operating at 2.9 μm region.

Role of Yb3+ ions on enhanced ~2.9 μm emission from Ho3+ ions in low phonon oxide glass system