Abstract
Novel two phosphate glass systems with compositions 50P(2)O(5)-30ZnO-20NiO and 50P(2)O(5)-30ZnO-20[NiCl2-6H2O] were prepared using a conventional melt-quench technique. The absorbance and transmittance were measured using a spectrophotometer in the spectral range between 190 and 1100nm. The data demonstrates that the system acts as a narrow bandpass optical absorption filter, with a transmission band in the UV region of 311-376nm, which is centred at 350nm and has a full width half maximum (FWHM) of almost 34nm, whereas, the red region is the UV region of 617-684nm, and centred at 650nm and has a full width half maximum (FWHM) of nearly 32nm. However, the refractive index (n), optical band gap (E-opt), non-linear refractive index n(2), third order non-linear susceptibility ((3)) and non-linear absorption coefficient were also calculated. It was apparent that the non-linear refractive index, third order non-linear susceptibility and non-linear absorption coefficient increases by decreasing the optical energy gap. Finally, we investigated the structure of the prepared glasses by using Raman and FTIR spectra. We found that the local network structure based mainly on Q(1) and Q(2) tetrahedron units connected by P-O-P linkages.