Optical glass and core material for optical fiber
AssigneeKabushiki Kaisha Ohara
InventorsMichiko Ogino, Masahiro Onozawa
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Abstract
Provided is optical glass that does not contain lead, which is an environmental pollutant. The optical glass is ideal for the transmission of light even after being exposed to X-rays, and has a high refractive index. The optical glass comprises, by mass% in terms of oxide versus the glass total mass, 1.0% to 60.0% of an SiO2 component, and one or more selected from the group consisting of an La2O3 component, ZrO2 component, TiO2 component, Nb2O5 component, and Ta2O5 as essential components. The optical glass has a refractive index (nd) of 1.50 or greater, and has a light intensity recovery rate of 45% or greater when the glass having been irradiated with X-rays with a dose of 2.5 Gy is irradiated with light of a xenon lamp for 11 hours.
Claims20
An optical glass, comprising an SiO2 component of no less than 1.0% and no greater than 60.0% by mass percent based on total mass of the glass in terms of oxide composition, and at least one selected from the group consisting of a La2O3 component, a ZrO2 component, a TiO2 component, an Nb2O5 component and Ta2O5 as an essential component, and having a refractive index (nd) of no less than 1.50, wherein a light intensity recovery rate is no less than 45% when the glass having been irradiated with X-rays with a dose of 2.5 Gy is irradiated with light of a xenon lamp for 11 hours.
Dependencies are inferred from the claim text.