Phase type spatial light modulator having an output substantially uniform in amplitude
US5708488A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 22, 1996 |
| Grant date | Jan 13, 1998 |
| Priority date | — |
| Expiry date | Oct 22, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2225/32
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Phase-type spatial modulation of light is achieved by placing a twisted pneumatic liquid crystal cell between two polarizers, such that a direction of alignment of liquid crystal molecules at an input side of the liquid crystal cell is parallel to a transmission access of a first one of the polarizers, and such that a direction of alignment liquid crystal molecules at an output side of the liquid crystal cell is parallel to a transmission access of a second one of the polarizers. Also, phase modulation which is substantially free from amplitude variations can be realized by placing two twisted pneumatic liquid crystal cells between two polarizers. In such an arrangement, a direction of alignment of the liquid crystal molecules at an input side of a first liquid crystal cell is parallel to a transmission access of a first polarizer, and a direction of alignment of liquid crystal molecules at an output side of the first liquid crystal cell is perpendicular to a direction of alignment of the liquid crystal molecules at an input side of the second liquid crystal cell. The direction of alignment of the liquid crystal molecules of the second liquid crystal cell is perpendicular to a tran…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.