Method and apparatus for correcting aberrations in photon collection devices
US6381044B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 28, 2000 |
| Grant date | Apr 30, 2002 |
| Priority date | — |
| Expiry date | Oct 13, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/4206
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A cover plate on a holographic optical element (HOE) device corrects for aberrations, such as spherical aberrations. The HOE device includes an emulsion material, having a recorded interference pattern that can perform diffraction, sandwiched between a first element and a second element, wherein the second element functions as the cover plate. One of the surfaces of the second element is aspheric to correct for aberrations. The aspheric shape of the surface adds approximately equal and approximately opposite aberrations associated with light rays diffracted by the recorded interference pattern, thereby substantially improving focus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.