Abstract
Bismuth-germanate glasses with low hydroxide content co-doped with Ho3+/Yb3+ 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 (hωmax = 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 Yb3+:2F5/2 quantum level indicate efficient Yb3+ → Ho3+ energy transfer (η = 61%). The developed active bismuth-germanate glass was used as the core of optical fibre operating in the mid-infrared region.
Highlights
Research on new optical materials for the mid-infrared region has been conducted for many years due to their potential use in applications such as atmosphere pollution monitoring, eye-safe laser radar, remote sensing, and microsurgery [1,2,3,4]
Non-oxide glasses with low phonon energy and high transparency in mid-IR are characterized by poor thermal stability which complicates processing them into photonic structures [7,8,9,10,11]
Bismuth-oxide based glasses characterized by relatively low maximum phonon energy, wide transparency windows, high thermal stability, and good mechanical and chemical properties are considered for use in optical fibre technology [15,16,17,18]
Summary
Research on new optical materials for the mid-infrared region has been conducted for many years due to their potential use in applications such as atmosphere pollution monitoring, eye-safe laser radar, remote sensing, and microsurgery [1,2,3,4]. Non-oxide glasses with low phonon energy and high transparency in mid-IR are characterized by poor thermal stability which complicates processing them into photonic structures [7,8,9,10,11]. Bismuth-oxide based glasses characterized by relatively low maximum phonon energy, wide transparency windows, high thermal stability, and good mechanical and chemical properties are considered for use in optical fibre technology [15,16,17,18]. Emission properties in the mid-infrared region of Ho3+ /Yb3+ co-doped heavy metal oxide glasses based on bismuth-germanate oxides and optical fibre have been investigated and compared. The results determine that HMO glass in optical fibre is a promising material for construction of new lasers and fibre amplifiers operating in the mid-infrared range
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