Magneto-optical light switching element and method of manufacturing same

US4770504A · kind A · utility

Assignee

• U.S. Philips Corporation · US

Inventors

• Peter Hansen · Appen, DE
• Claus-Peter Klages · Braunschweig, DE
• Klaus-Peter Schmidt · Bonn, DE
• Wolfgang F. M. Tolksdorf · Tornesch, DE
• Klaus Witter · Hamburg, DE

Key dates

• Filing date: Mar 3, 1987
• Grant date: Sep 13, 1988
• Expiry date: Mar 3, 2007

Classification

• Technology area (CPC G): Physics
• CPC primary: G02F1/09
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A magneto-optical light switching element comprising islands which are formed from an epitaxial layer on the basis of bismuth-substituted rare earth metal iron garnet, which layer is provided on a magnetically unordered, optically transparent, (111)-oriented garnet substrate, integrated heating resistors being provided on the islands which are surrounded by a coil, the epitaxial layer being grown from a melt which contains lead oxide and boron oxide as a flux, the boron content of the melt used for growing the epitaxial layer being in the range from 12.7 to 25 at % (cation content) and the coil being constructed as an integrated coil.