Method for producing buried regions of raised refractive index in a glass member by ion exchange

US4842629A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Peter Clemens · Munich, DE
• Herbert Michel · Munich, DE
• Christoph Thoma · Unterschleißheim, DE

Key dates

• Filing date: Nov 12, 1987
• Grant date: Jun 27, 1989
• Expiry date: Nov 12, 2007

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B6/1345
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

An improvement for a method of producing buried regions of raised refractive index in a glass member by ion exchange characterized by removing a titanium mask from the glass member after a first ion exchange to raise the refractive index of exposed portions of the glass member with an EDTA disodium etching solution followed by a slight material erosion of the glass after removal of the titanium mask prior to an implementation of a second field-assisted ion exchange.