Document Type : Original Article
Department of Inorganic Pigments and glazes, Institute for Color Science and Technology, P. O. Box: 16765-654, Tehran, Iran.
Dispersion, as the characteristic variation of refractive index with wavelength, is more pronounced, where the wavelength is approaching to the absorption band. In ultra-optical glasses, the nonlinear refractive index, concerning to the light intensity dependent phenomenon, becomes considerable. Here, two ultra-optical property glass systems; TiO2-Bi2O3-PbO (TBP) and Ga2O3-Bi2O3-PbO (GBP), which exhibited the most refractive indices, were selected. Their refractive index and dispersion measurements were done by `Minimum angle of deviation in a prism` method employing a spectrometer under different light spectra transmission. The corresponding nonlinear refractive indices of glasses were calculated by the Weber, et al., and Boling, et al., formulae and were analysed. The minimum refractive index in very long waves (infra-red), `n∞` and λs were estimated by `Kordes semi-empirical formula` and the dispersion curve fit method. Results suggested that the both glass systems could be good candidates for use in nonlinear optical applications, e.g. switches in all-optical telecommunications.