Quasi-phase-matched optical waveguides and method of making same
US5170460A · kind A · utility
Inventors
Key dates
| Filing date | Jun 24, 1991 |
| Grant date | Dec 8, 1992 |
| Priority date | — |
| Expiry date | Jun 24, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2202/20
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A waveguide in optically nonlinear materials for quasi-phase-matched frequency conversion of electromagnetic waves, arranged in a crystal substrate. The waveguide includes a periodically alternating crystal orientation necessary for quasi-phase-matching. The crystal orientation is provided in the form of a periodically domain inverted structure of ferroelectric domains, with reversed crystal orientation in relation to intermediate regions located between the domains. The domain structure is achieved by use of a periodic mask structure applied to the surface of the substrate in combination with a subsequent heat treatment of the substrate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.