GLASS FOR FIBER IN LIGHT GUIDE

摘要

A glass (GA1) for a fiber in a light guide is used in the core of a fiber (10) of a light guide, has a refractive index (nd) of 1.56-1.74, and has the following composition: (A) SiO2 = 20-55wt%; (B1) B2O3 = 0-4.0wt%; (B2) does not include P2O5 or GeO2; (C) (BaO+SrO+La2O3+Lu2O3+Ta2O3+Gd2O3+WO3) = 25-72wt%; (D) ZnO = 0-30wt%; (E) does not include Al2O3; (F) does not include ZrO2; (G) does not include PbO or As2O3; (H) (Na2O+K2O) = 0-15wt%; (I) Sb2O3 = 0-0.050wt%; (J) (Na2SO4+K2SO4) = 0.26-1.63wt%.