A method of preparing a hologram having an increased replay wavelength and resulting hologram
US4769300A · kind A · utility
5Cited by
7References
21Claims
0Family size
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Inventor
Key dates
| Filing date | Dec 10, 1986 |
| Grant date | Sep 6, 1988 |
| Priority date | — |
| Expiry date | Dec 10, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C5/44
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Holograms which contain gelatin as the binder are prepared by holographically exposing the holographic material by use of coherent light, developing the holographic image by a chemical or physical process and before processing, simultaneously or subsequently, treating the material with a solution of an onium compound which comprises at least one alkyl group having from 10 to 18 carbon atoms or in which the total number of carbon atoms in the substituent group is at least 15 or a polymeric compound which comprises at least one onium group in the repeating unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.