Method for making holographic optical elements with high diffraction efficiencies
US4416505A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 26, 1981 |
| Grant date | Nov 22, 1983 |
| Priority date | — |
| Expiry date | Oct 26, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B26/106
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Production quantities of a multi-element holographic scanner disc are made by optically replicating a silver halide master disc one element at a time in a dichromated gelatin film. The dichromated gelatin film swells during processing. The swell is monitored during production by determining the shift in the angle of the Bragg surfaces within the gel. The angle of the replicating beam for each element is changed from that of the original reference beam to establish a Bragg angle at exposure which will be tilted to the proper angle after swelling in order to maximize the diffraction efficiency of the element at the original reference beam angle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.