Abstract
In pursuit of manufacturing glass having a high refractive index and low dispersion, a series of lead and borate glasses containing germanium and chromium oxide by composition 25B2O3-73.8PbO-xGeO2-(1.2 − x)Cr2O3, with 0 ≤ x ≤ 1.2 mol.%, are prepared. IR measurements are carried out to explore the structure of as-prepared samples. The deconvoluted IR peaks revealed presence of bridging oxygen up to x = 0.6 mol%. At x > 0.6 mol% none bridging oxygen is the dominant. The dependence of the measured hydrostatic density and corresponding molar volume for the studied compositions are analyzed and discussed. The dispersion curves of refractive index (n) and absorption index (k) are calculated in the spectral range 300–2500 nm. The effect of increasing the ratio GeO2/[GeO2 + Cr2O3] on the calculated dispersion energy, lattice energy, oscillator energy and material dispersion are deduced. For photonic applications, the wavelength at zero material dispersion for the investigated samples is calculated and compared with other systems based on Borates, silicates and Germinate fiber. The results recommend that the present glass could be used in different modern optoelectronics devices.
Highlights
The accelerated use of infrared spectrum of light has led to the development of new optical materials for several advanced optical devices and systems
The FTIR spectrum of the investigated compositions is shown in Fig. (1)
The obtained absorption peaks of the FTIR spectrum show many features, as x increases from 0 to1.2 mole%, which are related to the structural aspects from which it can be seen as follows: The spectrum consist mainly of four main regions which are positioned in the ranges 407-554 cm-1, 611-782 cm-1, 786-1131 cm-1 and 1131-1500 cm-1 (Abdel-Baki et al 2007)
Summary
The accelerated use of infrared spectrum of light has led to the development of new optical materials for several advanced optical devices and systems. Oxide glasses with mixed cation compositions are thermally stable and have controllable refractive index variation. In this regard, borate glass is considered as one of the most popular and excellent glass forming materials (Abdel-Baki et al 2007). Borate glasses doped by chromium ions showed large optical nonlinearity due to the large hyper-polarizability of Cr2O3 (Abdel Wahab et al 2009). Glasses containing cations such as Pb2+ with an outer electron shell of 18+2 electrons should have higher polarizabilities and lower melting temperatures (ElDiasty et al 2014). All optical measurements are carried out at room temperature and in the entire spectral range 200-2500 nm
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