Directing optical beam
US4006967A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 23, 1975 |
| Grant date | Feb 8, 1977 |
| Priority date | — |
| Expiry date | Apr 23, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/335
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Methods and apparatus for directing a beam of optical radiation toward a selected location and modulating the intensity thereof at the location by directing the beam over a path that includes a Bragg grating, and selectively modifying the angle between the direction at which the beam enters the Bragg grating and a direction of Bragg incidence of the grating by applying an electric or acoustic field to change the index of refraction in a portion of the path. An electric field may be applied either by interdigital electrodes at the grating, to change the Bragg angle thereof, or by electrodes at different angles across an earlier portion of the path, to change the direction at which the beam enters the grating. An acoustic field may be applied in an analogous manner. Useful for modulating and switching in planar wave guides and bulk material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.