Unpolished optical element with periodic surface roughness
US7249853B2 · kind B2 · utility
37Cited by
11References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 13, 2005 |
| Grant date | Jul 31, 2007 |
| Priority date | — |
| Expiry date | Feb 14, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/208
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical sub-system has an optical element having a curved surface featured with a plurality of recurring surface tooling marks. The depth of any surface tooling mark is less than 0.2 wavelengths, whereby light is diffracted on the curved surface. A spatial filter blocks the diffracted light and passes the undiffracted light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.