Spatial light modulator and spatial light modulating method
US6348990B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 2000 |
| Grant date | Feb 19, 2002 |
| Priority date | — |
| Expiry date | Dec 18, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/12
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A signal image is transmitted by write light from a transmission type liquid crystal element 4 to an optically-addressed type parallel-aligned nematic-liquid-crystal spatial light modulator 6. The numerical aperture NAL of a relay lens 5, the pitch P of the pixel structure of the transmission type liquid crystal element 4, and the wavelength &lgr; of light from the write light source 1 are set with the condition 1/2P<NAL/&lgr;<1/P. As a result, the signal component caused by the pixel structure can be erased. Furthermore, no degradation is generated in the entire range of the spatial frequencies of the signal image that can be produced by the transmission type liquid crystal element 4.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.