Effect of UVUV exposure on photochromic glasses doped with transition metal oxides

• Study the effect of UVUV light on photochromic glasses doped with several transition metal oxides.
• Reflectance curve increases in the three glass samples after UVUV exposure.
• Refractive index of glass doped with CoOCoO increases with 13%.
• Nonlinear parameter increases in the three glass samples after UVUV exposure so it can be used in optoelectronic devices.
• Refractive index at infinite wavelength n∞n∞ increases after exposure in the three glass samples that means electronic transitions increases after exposure.

Silver halide photochromic glasses doped with one of the transition metal oxides,(TiO2),(CoO),(Cr2O3)(TiO2),(CoO),(Cr2O3) are prepared using the melt quench technique. Glass samples are exposed to a UVUV source for 20 min. Spectral reflectance and transmittance at normal incidence of the prepared glasses are recorded before and after UVUV exposure with a double beam spectrophotometer in the spectral range 200–2500 nm. Dispersion parameters such as: single oscillator energy, dispersion energy and Abbe's number are deduced and compared. Absorption dispersion parameters, like optical energy gap for direct and indirect transitions, Urbach energy and steepness parameter, are deduced for the different glass prepared. Reflection loss, molar refractivity and electronic polarizability are deduced and compared.The effect of UVUV light exposure of these glasses on transmittance, reflectance, the linear and the predicted nonlinear optical parameters are investigated and discussed for the three transition metals. Nonlinear parameters increase in the three glass samples after UVUV exposure.