Ultraviolet resistive antireflective coating of Ta.sub.2 O.sub.5 doped with Al.sub.2 O.sub.3 and method of fabrication
US5457570A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 25, 1993 |
| Grant date | Oct 10, 1995 |
| Priority date | — |
| Expiry date | May 25, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/283
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A coating for an optical component is formed to be antireflective for a selected wavelength and resistive to the transmission of ultraviolet radiation. The coating has first layer is formed of a dielectric material having a refractive index n.sub.1 coated onto the optical component. A second layer is formed of a dielectric layer having a refractive index n.sub.2 that is smaller than the refractive index n.sub.1 of the first layer. The second layer is formed of a material that transmits the selected wavelength while blocking ultraviolet light, thereby protecting the first layer and the optical component from damage due to exposure to ultraviolet radiation. The thicknesses of the layers is selected so that the coating is antireflective for the selected wavelength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.