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Bismuth-germanate glasses with low hydroxide content co-doped with Ho 3+ /Yb 3+ ions have been investigated in terms of structural and spectroscopic properties. To reduce OH⁻ ions content and improve transmittance value at the wavelength of 3.1 µm, the glass synthesis has been carried out in low vacuum conditions (45-65 mBar). The composition of the host glass based on heavy metal oxides affects the maximum phonon energy (hω max = 724 cm -1 ), which low value has a positive impact on the mid-infrared emission parameters. Emission band at the wavelength of 2.87 µm was observed in glass co-doped with mol% 0.25 Ho₂O₃/0.75 Yb₂O₃ under 980 nm high power laser diode wavelength excitation. Lifetime measurements of the Yb 3+ :²F 5/2 quantum level indicate efficient Yb 3+ → Ho 3+ energy transfer (η = 61%). The developed active bismuth-germanate glass was used as the core of optical fibre operating in the mid-infrared region.

Study of Mid-Infrared Emission and Structural Properties of Heavy Metal Oxide Glass and Optical Fibre Co-Doped with Ho3+/Yb3+ Ions