High NA catadioptric focusing device having flat diffractive surfaces
US5986995A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 21, 1999 |
| Grant date | Nov 16, 1999 |
| Priority date | — |
| Expiry date | Jan 21, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/13725
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magneto-optical head using a catadioptric focusing device comprised of an incident surface, a bottom reflective surface, a pedestal, and a body. The incident surface is generally flat and is comprised of a central diffractive, optically transmissive facet and a peripheral facet comprised of a diffractive-reflective surface or facet. In a data writing or reading mode, an incident optical beam, such as a laser beam impinges upon the central facet, and is diffracted thereby. The incident laser beam can be collimated, convergent or divergent. The laser beam passes through the transparent body, and impinges upon the bottom reflective surface. The laser beam is then reflected by the bottom reflective surface, through the body, unto the peripheral diffractive-reflective surface. The laser beam is reflected and also diffracted by the peripheral diffractive-reflective surface as a focused beam, through the body, and is focused as a focal point located at, or in close proximity to a pedestal edge, along a central axis, in very close proximity to the disk. This will allow the focused optical beam to propagate toward, or penetrate the disk through evanescent wave coupling, for enabling the t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.