System for enhancement of optical features
US4674824A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 14, 1985 |
| Grant date | Jun 23, 1987 |
| Priority date | — |
| Expiry date | Jun 14, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2001/0268
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An optical system for selectively enhancing and/or suppressing the spectral intensity of components in an object beam, is disclosed. In one exemplary application, the optical system includes means for performing a forward transform operation on an input beam, a non-linear optical medium such as, for example, Bi.sub.12 SiO.sub.20 or Bi.sub.12 GeO.sub.20 and means for performing an inverse transform operation. In operation, the forward transform is performed on an input beam that contains a complex function characteristic of an object or subject, the resulting transform of the object beam is applied to the non-linear optical medium to form a hologram, then the hologram is read-out and the inverse transform operation is performed to provide an output optical beam that contains, for example, selectively enhanced intensity components and/or selectively suppressed intensity components. In one specific application, the object beam is obtained by transmitting a laser beam through a photomask such as, for example, the type used for fabricating semiconductor integrated circuits, the non-linear properties of the photorefractive crystal provide filtering or inversion of the intensity of the pe…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.