Core glass in the alkali-zinc-silicate glass system for an fiber-optic light guide and fiber-optic light guide made with said core glass

US8039410B2 · kind B2 · utility

Assignee

• Schott AG · DE

Inventors

• Uwe Kolberg · Mainz, DE
• Axel Curdt · Georgenborn, DE
• Monika Gierke · Wiesbaden, DE
• Magdalena Winkler-Trudewig · Mainz, DE
• Guenther Kron · Mainz, DE
• Doris Ehrt · Jena, DE

Key dates

• Filing date: Dec 19, 2008
• Grant date: Oct 18, 2011
• Expiry date: Sep 24, 2029

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C13/046
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A core glass and a fiber-optic light guide made from it and a cladding glass are described. The core glass is in the alkali-zinc-silicate system and contains, in Mol % on an oxide basis: 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, Σ ZrO2+HfO2; 0.4-6, BaO; 0-6, SrO; 0-2, MgO; 0-2, CaO; 0.4-6, Σ alkaline earth metal oxides; 0.5-3, Li2O, but no more Li2O than 25% of the Σ alkali metal oxides; >58.5, Σ SiO2+ZrO2+HfO2. A molar ratio of Na2O/K2O is from 1/1.1 to 1/0.3. A molar ratio of ZnO to BaO is greater than 3.5.