Mother glass composition for graded index lens, graded index lens, manufacturing method of graded index lens, optical product and optical instrument using the same

摘要

A mother glass composition for graded index lenses, comprising the following glass components in mol %: 40≦SiO₂≦65, 1≦TiO₂≦10, 0≦MgO≦22, 2≦Li₂O≦18, 2≦Na₂O≦20, 6≦Li₂O+Na₂O≦38, and from 0.1 to 15 mol % of any two or more of CaO, SrO and BaO, a graded index lens using the mother glass composition, a manufacturing method of the graded index lens, and an optical product and an optical instrument using the graded index lens, are provided.