Acquisition and replay systems for direct-to-digital holography and holovision
US6525821B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 4, 2000 |
| Grant date | Feb 25, 2003 |
| Priority date | — |
| Expiry date | Jan 4, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2226/11
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Improvements to the acquisition and replay systems for direct-to-digital holography and holovision are described. A method of recording an off-axis hologram includes: splitting a laser beam into an object beam and a reference beam; reflecting the reference beam from a reference beam mirror; reflecting the object beam from an illumination beamsplitter; passing the object beam through an objective lens; reflecting the object beam from an object; focusing the reference beam and the object beam at a focal plane of a digital recorder to form an off-axis hologram; digitally recording the off-axis hologram; and transforming the off-axis hologram in accordance with a Fourier transform to obtain a set of results. A method of writing an off-axis hologram includes: passing a laser beam through a spatial light modulator; and focusing the laser beam at a focal plane of a photorefractive crystal to impose a holographic diffraction grating pattern on the photorefractive crystal. A method of replaying an off-axis hologram includes: illuminating a photorefractive crystal having a holographic diffraction grating with a replay beam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.