Abstract
This work reports the enhanced emission at 2.7 µm in Er3+/Ho3+-codoped fluorotellurite glass upon a conventional 980 nm laser diode. The significantly reduced green upconversion and 1.5 µm emission intensity in Er3+/Ho3+-codoped samples are observed. The results suggest that the Er3+: 4I13/2 state can be efficiently depopulated via energy transfer from Er3+ to Ho3+ and the detailed energy transfer mechanisms are discussed qualitatively. The energy transfer efficiency from Er3+: 4I13/2 to Ho3+: 5I7 is calculated to be as high as 67.33%. The calculated emission cross-section in Er3+/Ho3+-codoped fluorotellurite glass is 1.82 × 10−20 cm2. This suggests that Er3+/Ho3+-codoped fluorotellurite glass is a potential material for 2.7 µm fiber laser.
Highlights
Owing to the increased interest in mid-infrared laser fiber (2–5 μm) used in laser surgery and remote chemical sensing fields, considerable researches have been performed to searching for new Fibers 2013, 1 materials to use as hosts for mid-infrared laser hosts especially for Er3+ 2.7 μm [1,2]
The strong absorption around 980 nm of the Er3+/Ho3+-codoped sample indicates that this glass can be excited efficiently by a 980 nm laser diode (LD)
Enhanced 2.7 μm emission was obtained in Er3+/Ho3+-codoped fluorotellurite glass
Summary
Owing to the increased interest in mid-infrared laser fiber (2–5 μm) used in laser surgery and remote chemical sensing fields, considerable researches have been performed to searching for new Fibers 2013, 1 materials to use as hosts for mid-infrared laser hosts especially for Er3+ 2.7 μm [1,2]. Fluoride fibers have emerged as natural candidates for mid-infrared laser materials because of their low phonon energy which decreases the rate of phonon-assisted nonradiative transitions [3,4]. The mid-infrared emission of Er3+ can hardly be observed in oxide glasses owing to the large phonon energy. Among all the oxide glasses, tellurite glasses emerge as good candidates for midinfrared fiber laser materials because of their lowest phonon energy (760 cm−1) among all the oxide glasses with large refractive index and a broad transmission window (0.4–6 μm) [5,6,7]. As is reported before [12], the addition of fluoride in the tellurite glasses was proved to be an effective way to reduce OH−1 groups and increase the radiative transition probabilities of 2.7 μm emission. The detailed energy transfer processes based on the measured upconversion, near-infrared and mid-infrared fluorescence spectra are discussed
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