Abstract
Heavy metal oxide glasses, containing bismuth and/or lead in their glass structure are new alternatives for rare eart (RE) doped hosts. Hence, the study of the structure of these vitreous systems is of great interest for science and technology. In this research work, GeO2-PbO-Bi2O3 glass host doped with Er3+/Yb3+ ions was synthesized by a conventional melt quenching method. The Fourier transform infrared (FTIR) results showed that PbO and Bi2O3 participate with PbO4 tetragonal pyramids and strongly distort BiO6 octahedral units in the glass network, which subsequently act as modifiers in glass structure. These results also confirmed the existence of both four and six coordination of germanium oxide in glass matrix.
Highlights
The optical fibers using heavy metal oxide glasses have good environmental stability and medium optical loss in comparison with fluorides, which makes them suitable for photonic applications in short distances [1]
Bismuth-germanate glasses are increasingly used for applications in non-linear optics, optical switching and second harmonic generation (SHG) [3] especially because of their high linear and nonlinear refractive index [4], high thermal expansion, low transition temperature, and excellent infrared transmission [2]
Recent infrared (IR) and Raman studies on manganese doped (100 − x)GeO2-xBi2O3 system showed that Bi3+ ions incorporate in glass structure with deformed BiO6 octahedral units [5]
Summary
The optical fibers using heavy metal oxide glasses have good environmental stability and medium optical loss in comparison with fluorides, which makes them suitable for photonic applications in short distances [1]. Bismuth-germanate glasses are increasingly used for applications in non-linear optics, optical switching and second harmonic generation (SHG) [3] especially because of their high linear and nonlinear refractive index [4], high thermal expansion, low transition temperature, and excellent infrared transmission [2]. Recent infrared (IR) and Raman studies on manganese doped (100 − x)GeO2-xBi2O3 system showed that Bi3+ ions incorporate in glass structure with deformed BiO6 octahedral units [5]. X-ray absorption fine structure (EXAFS) and vibrational study on xPbO-(1 − x)GeO2 system [6], at low lead content, lead ions act as modifiers in the germanate network, in PbO compositions higher than 40%, lead ions increasingly play a network former role in glass structure. Fourier transform infrared (FTIR) spectroscopy was used to probe into the structure of the prepared glass samples
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