The core glass in the alkali - - - zinc silicate glass system in the case of a fiber-optic light guide and the fiber optic light guide with this core glass

摘要

It is a new core glass in the alkali - - - zinc silicate glass system described in the case of a fiber-optic light guide which, in mol%, based on oxide contains 54,5 - 65 sio₂, 18,5 - 30 Zno, 8 - 20 σ alkali metal oxides, 0,5 - 3 la₂O₃, 2 - 5 Zro₂, 0,02 - 5 Hfo₂, 2,02 - 5 Zro₂ + Hfo₂, 0,4 - 6 Bao, 0,0 - 6 sro, 0 - 2 mgo, 0 - 2 cao, 0,4 - 6 σ alkaline earth metal oxides, 0,5 - 3 li₂O, but not more li₂O as 25% of the sum of the alkali metal oxides, 58,5 σ sio₂ + Zro₂ + Hfo₂ and in which the ratio of na.sub.2₂O: k₂O 1: 1,1 to 1: 0,3 as well as the ratio of zno: bao greater than 3,5: 1, as well as a fiber optic light guide with this core glass.