Optical phase noise filter using randomly placed spots
US6031666A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 10, 1998 |
| Grant date | Feb 29, 2000 |
| Priority date | — |
| Expiry date | Aug 10, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/20
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical phase noise filter for use with an optical imaging system such as a solid-state imager or the like, including a transparent substrate; and a plurality of transparent spots randomly placed on the transparent substrate for producing a phase difference between a wavefront transmitted through the transparent spots and that portion of the transparent substrate other than the transparent spots to define an optical phase noise filter having a spatial sampling cut-off frequency and wherein the variance of the transparent spot to transparent spot distance between adjacent spots is minimized while maintaining the randomness of transparent spot placement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.