Refractive Index Dispersion of Aluminate Glasses on the Addition of <TEX>$SiO_2$</TEX>

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J. Korean Ceram. Soc. > Volume 34(7); 1997 > Article

Journal of the Korean Ceramic Society 1997;34(7): 693.

$SiO_2$ 첨가에 따른 알루미네이트 유리의 굴절률 분산 특성

원종원, 정용선, 오근호¹

한양대학교 세라믹공정연구센터
¹한양대학교 세라믹공학과

Refractive Index Dispersion of Aluminate Glasses on the Addition of $SiO_2$

ABSTRACT

The refractive index and dispersion in the (100-x)(0.6CaO.0.4Al2O3).xSiO2(x=0~30) glasses were investigated. As the amount of SiO2 increased, the refractive index decreased. The change of refractive index was attributed to the change of the molar refraction rather than the molar volume. When the amount of SiO2 was smaller than 20 mol%, the average electronic transition energy gaps(E0) and the electronic oscillator strengths(Ed) were about 10.9($pm$0.1) nd 18($pm$0.5)eV, respectively. However E0 and Ed of the glass (CAS30) with 30 mol% SiO2 increased to 12.63 and 19.89eV, respectively. The similar results was observed in the variation of Abbe Number. Abbe number of the glass in the range of 0~20 mol% SiO2 was about 46 and that of CAS30 increased to 60. The zero-material dispersion wavelength({{{{ lambda }}0) of pure calcium aluminate glass was 1.8 ${mu}{textrm}{m}$. As the amount of SiO2 increased, the zero-material dispersion wavelength shifted to a shorter wavelength. {{{{ lambda }}0 of CAS30 was 1.5 ${mu}{textrm}{m}$, that is currently using for the optical telecommunication system.

Key words: Aluminate glass, Refractive index, Material dispersion, Optical fiber