Compositional dependence of optical constants in lead borate glasses containing varying amounts of chromium and germanium oxides
Fouad El-Diasty1, Manal Abdel-Baki2 and Fathy Abdel-Wahab1
1Physics Department, Faculty of Science, Ain Shams University, Cairo 11566 Egypt
2Glass Research Department, National Research Center, Dokki, Cairo Egypt
In pursuit of manufacturing glasses having high refractive index, low dispersion and low absorption, a series of lead and borate glasses containing chromium and germanium
oxides is prepared in the form of plane parallel slabs using the normal melt-quenching technique. By varying GeO2
ratio, the refractive index, n
, and extinction coefficient, k
were calculated as a function of glass composition in a wide spectral range from 200 to 2500 nm. The Refractive index and extinction coefficient were calculated accurately utilizing
the measured glass transmittance, T
, and reflectance, R
. The optical constants of the studied glasses were strongly affected by the behavior of varying GeO2
ratio on the glass
ionicity, density, molar volume, average boron-boron separation, oxide molar refraction, metallization criterion, electronic oxide polarizability and non-bridging oxygen concentration.
The optical properties of the prepared glasses nominate it to be used in different optoelectronics devices.