Waveguide including volume Bragg gratings
US10725291B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 15, 2018 |
| Grant date | Jul 28, 2020 |
| Priority date | — |
| Expiry date | Nov 2, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0178
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A waveguide is provided for conveying image light. The waveguide includes an input port for receiving a first beam of image light carrying an image in a wavelength band. A first diffraction grating of the waveguide includes a plurality of volume Bragg gratings (VBGs) configured to expand the first beam along a first axis and to redirect the first beam towards a second diffraction grating of the waveguide. The second diffraction grating includes a plurality of VBGs configured to receive the first beam from the first diffraction grating and to out-couple different portions of the first wavelength band of the first beam along a second axis, thereby expanding the first beam along the second axis for observation of the image by a user.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.