Abstract
Refractive indexes of barium borate-based glasses were measured in the wavelength range from 0.265 to 1.710μm by using the minimum deviation method. Factors affecting the refractive index dispersion are discussed by using the single-oscillator Drude-Voigt equation. Borate glasses are characterized by the larger number N of molecules in a unit volume than that for silicate glasses. The feature of borate glasses, that is, relative high refractive index and low dispersion, is dominated by the number N which is related to the fraction of four-coordinated borons estimated by Green-blatt and Bray. Borate glasses containing high valency cations, e.g., Y3+, La3+, Ti4+, Nb5+, Ta5+, posess higher refractive indexes and higher dispersion than barium borate binary glasses.
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