Optical fluorophosphate glass and process of making same

US4040846A · kind A · utility

Assignee

• Ernst Leitz GmbH

Inventors

• Heinz Broemer · Wetzlar, DE
• Norbert Meinert · Witzenhausen, DE

Key dates

• Filing date: Mar 17, 1976
• Grant date: Aug 9, 1977
• Expiry date: Mar 17, 1996

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S501/903
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A fluorophosphate glass of a high positive anomalous partial dispersion .DELTA..nu..sub.e within the range of from about +10.0 to about +21.0, a relatively high index of refraction n.sub.e within the range of from about 1.47 to about 1.54, and an Abbe number .nu..sub.e within the range of from about 84.1 to about 51.0 is provided. A simple process of melting such a glass is disclosed.