Method and apparatus for writing photosensitive grating using Lloyd's mirror
US5629998A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 29, 1996 |
| Grant date | May 13, 1997 |
| Priority date | — |
| Expiry date | Jan 29, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/02133
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Apparatus for forming a refractive index grating in a waveguide in accordance with the invention includes a waveguide formed from a material that changes its index of refraction when exposed to a beam of optical radiation, a source of coherent optical radiation for forming a beam of radiation, a mirror arranged to intercept a first part of a beam and to reflect the first part of the beam through an angle, and a phase delay plate arranged to intercept a second part of the beam for delaying the second part of the beam propagating through the plate, in which the mirror and the phase delay plate are arranged so that the first part of the beam and the second delayed part of the beam form an interference pattern on the waveguide for changing the index of refraction of the waveguide, in a pattern corresponding to the interference pattern for forming an index grating in the waveguide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.