Method of making high performance optical edge and notch filters and resulting products
US7123416B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 11, 2005 |
| Grant date | Oct 17, 2006 |
| Priority date | — |
| Expiry date | Oct 11, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/8438
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
High performance optical edge and notch filters and methods of making the same are disclosed. The multi-layer, thin-film optical edge filters have an edge steepness greater than about 0.8% as measured by dividing (a) the edge width from the 50% transmission wavelength to the optical density 6 (“OD6”) wavelength by (b) the 50% transmission wavelength. The optical edge filters also have an average transmission above about 95%. The notch filters exhibit a blocking of OD>6, very high transmission (>90%) outside the notch(es), and a narrow notch bandwidth comparable to that of holographic notch filters. The methods for making such filters accurately determine when deposition of each layer of the filter should terminate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.