Optical element

US4498728A · kind A · utility

Assignee

• Balzers Aktiengesellschaft · LI

Inventors

• Werner Thoni · Maienfeld, CH
• Peter Huber · Neubiberg, DE
• Karl Hohenegger · Vaduz, LI

Key dates

• Filing date: Mar 1, 1983
• Grant date: Feb 12, 1985
• Expiry date: Mar 1, 2003

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B13/14
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

An optical element particularly elements of IR optics comprises a system of a plurality of infrared transmitting optically effective thin layers of substances. The substances are chosen from the group: germanium, zinc selenide, zinc sulfide, chalcogenide glasses, thorium fluoride, yttrium fluoride, and praseodymium fluoride. The layers are applied to an infrared transmitting substrate of a material of the group: germanium, zinc selenide, zinc sulfide and chalcogenide glasses. An intermediate layer is disposed between the thin layers and the infrared transmitting substrate and this has a maximum thickness of 100 nm and comprises a material of the group: hafnium oxide, yttrium oxide, and scandium oxide.