SELLMEIER COEFFICIENTS AND CHROMATIC DISPERSIONS FOR SOME TELLURITE GLASSES

Sellmeier coefficients are necessary to optimize the design parameters of optical devices, These coefficients are computed for binary tellurite glasses to find the chromatic dispersion behavior at any wavelength, particularly at the optical windows of optical fiber communication systems and femtosecond technology, A single-oscillator DiDomenico and Wemple's dispersion equation is not sufficient to represent accurately the measured refractive indexes throughout the transmission range. As a minimum, a tno-pole Sellmeier equation is necessary to represent the data more accurately. Both the average electronic absorption band gap and the lattice absorption frequency, lying in the UV and IR region, respectively, affect the refractive indexes and their dispersion, Various other optical properties are discussed, A single-oscillator dispersion equation is unable to verify the existence of zero-dispersion wavelength.