Dual grating filtering system
US6606197B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 13, 2002 |
| Grant date | Aug 12, 2003 |
| Priority date | — |
| Expiry date | May 13, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/2773
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A light filtering assembly for filtering an input beam of light having a plurality of desired wavelength components and a plurality of unwanted wavelength components so as to provide an output beam having only the desired wavelength components. The filtering assembly comprises an input section, a filtering section, and an output section. The input section divides the input beam into a plurality of polarized beamlets that travel along a corresponding plurality of spatially separated beam paths. The polarized beamlets comprise a plurality of desired beamlets corresponding to the desired wavelength components of the input beam and a plurality of unwanted beamlets corresponding to the unwanted wavelength components of the input beam. The filtering section is disposed in the paths of the beamlets so that the desired beamlets are passed and the unwanted beamlets are blocked. The output section is disposed in the paths of the desired beamlets exiting the filtering section and combines the desired beamlets so as to form the output beam. The output section is substantially identical to the input section to provide bi-directional capabilities. Because the beamlets are linearly polarized, the…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.