| 摘要 |
A lead-free optical glass having a chemical composition, in mole %: Bi2O3: 4 5 to 75 %, B2O3: 12 to 45 %, Ga2O3: 1 to 20 %, In2O3: 1 to 20 %, ZnO: 0 to 20 %, BaO: 0 to 15 %, SiO2 + Al2O3 + GeO2: 0 to 15 %, MgO + CaO + SrO: 0 to 15 %, SnO2 + TeO2 + TiO2 + ZrO2 + Ta2O3 + Y2O3 + WO3: 0 to 10 %, CeO2: 0 to 5 %, with the proviso that Ga2O3 + In2O3 + ZnO >= 5 %; and an optical fiber ha ving a core comprising the lead-free optical glass.
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