Wavelength selective filter
US6141361A · kind A · utility
123Cited by
4References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 24, 1997 |
| Grant date | Oct 31, 2000 |
| Priority date | — |
| Expiry date | Jul 24, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H1/2294
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A tunable optical wavelength selective filter is constituted by a dynamic holographic diffraction element (3) in combination with a fixed diffraction grating or hologram (2). The dynamic diffraction element (3) is preferably implemented as an electronically controlled image displayed on a pixelated spatial light modulator and in particular a spatial light modulating using photo-electronic integrated circuits fabricated using silicon VLSI technology and integrated with ferro-electric liquid crystals. Amongst other uses the filter can be implemented to form a digitally tunable laser.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.