Impurity Absorption Loss due to Rare Earth Elements in a Fluoride Glass

Abstract

Optical spectra for each of the rare earth element doped BaF2-GdF3-ZrF4 glasses were measured. It was found that, in the 2–5 µm wavelength region, Ce, Pr, Nd, Sm, Tb and Dy contribute to the absorption loss and the loss magnitude due to each rare earth element of lppmw is several tens of dB per kilometer at the absorption peaks. It was concluded that the rare earth impurity concentration in fluoride optical fibers should be decreased to less than 0.1 ppbw in order to make the absorption loss 10-3 dB/km in the 3–4 µm wavelength.

Optical properties of alkali and alkaline-earth lead borate glasses doped with Nd3+ Ions

“…Physical properties, such as the polaron radius r p , the internuclear distance r i , the dielectric constant ε , and the molar refractivity R M , were determined from the density, the average molecular weight, the refractive index, and the concentration of the rare-earth ions using standard formulas [18,19]. The reflection loss ( R , %)…”

Fluoride Glasses for Bulk Optical and Waveguide Applications

“…The attenuation values (dB/km ppmw) tend to be slightly larger than those reported for fluorozirconate glasses. 2 The construntion of a furnace, capable of reactive atmosphere processing (RAP melci~ng) up to 1 kg of glass, was completed in mid-985.…”

Influence of Various Glass Compositions on Physical and Spectroscopic Properties of Cao-Pb3O4-Zno-P2O5 Glass System

“…This absorption can be assigned to the The cubic symmetry of Cu 2+ ions is disturbed by electronic hole in the degenerate orbital which has caused the tetragonal distortion. However, Cu 2+ , being as d 9 ion, experiences a strong Jahn-Teller distortion, which leads to the splitting of energy levels [18,20] and causes predominantly an elongated octahedral coordination with four short inplane bond lengths and longer axial bond lengths. Table 3 shows the observed optical absorption band positions and the transitions of prepared glass samples.…”