Single beam write and/or replay of spatial heterodyne holograms
US7298532B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 11, 2002 |
| Grant date | Nov 20, 2007 |
| Priority date | — |
| Expiry date | Sep 10, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2226/11
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method of writing a spatially heterodyne hologram having spatially heterodyne fringes includes: passing a single write beam through a spatial light modulator that digitally modulates said single write beam; and focusing the single write beam at a focal plane of a lens to impose a holographic diffraction grating pattern on the photorefractive crystal, the holographic diffraction grating pattern including the spatially heterodyne hologram having spatially heterodyne fringes, wherein only said single write beam is incident on said photorefractive crystal without a reference beam. A method of replaying a spatially heterodyne hologram having spatially heterodyne fringes at a replay angle includes: illuminating a photorefractive crystal having a holographic diffraction grating with a beam from a laser at an illumination angle, the holographic diffraction grating pattern including the spatially heterodyne hologram having spatially heterodyne fringes, wherein a difference between said illumination angle and said replay angle defines a diffraction angle α that is a function of a plane wave mathematically added to original object wave phase and amplitude data of said spatially heterodyne h…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.