Longitudinal PLZT spatial light modulator
US5221989A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 13, 1991 |
| Grant date | Jun 22, 1993 |
| Priority date | — |
| Expiry date | Nov 13, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2225/32
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A spatial light modulator comprises a plate of non-ferroelectric PLZT ceramic. An array of pixels is formed by depositing a reflecting coating in the desired array on one side of the plate. A longitudinal electric field is applied so that the light entering the plate from the side opposite the reflecting coating experiences a polarization-independent refractive index change when the electric field is applied as it propagates parallel to the electric field. The required voltages may be decreased when a partially reflecting coating is deposited on the side opposite the reflecting coating. Grooves in the plate effectively isolate the pixels from electrical and mechanical crosstalk.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.