Method of recording holographic images in white light image plane holograms
US4512624A · kind A · utility
Inventor
Key dates
| Filing date | Nov 23, 1981 |
| Grant date | Apr 23, 1985 |
| Priority date | — |
| Expiry date | Nov 23, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S359/90
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method of producing a real image plane hologram illuminable by a white light point source is disclosed. A transmission hologram, which is produced by either a diverging reference beam or a collimated reference beam, is positioned relative to a reconstruction beam which is the conjugate time reversed beam of the reference beam used to create the real image on the transmission hologram. A mask defining a generally elliptically-shaped opening is placed over the transmission hologram to construct the real image. A photographic plate is positioned in a plane generally parallel to the plane containing the transmission hologram, approximately at the location of the reconstructed real image. A converging reference beam is then directed at the photographic plate to create a real image plane hologram. The real image can be reconstructed from the real image plane hologram by illuminating it with a diverging white light point source at the conjugate time reversed position of the converging reference beam. Steps are also disclosed for enlarging or reducing the image recorded in the image plane hologram relative to the size of the image recorded in the transmission plane hologram, while minimi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.