Complex photodichroic spatial filter
US4110004A · kind A · utility
10Cited by
4References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 12, 1977 |
| Grant date | Aug 29, 1978 |
| Priority date | — |
| Expiry date | Jan 12, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/46
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A complex spatial filter is provided by the combination of two dichroic ctal plates, one quarter waveplate, and two linear polarizers. The complex spatial filter consists of real and imaginary parts, both of which can have either a positive or negative sign and the structure is capable of eraseably recording varying degrees of absorbency which exhibit polarization discrimination in a desired format that can then be used to process the Fourier transform of a light beam containing desired information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.