Optical waveguide element, optical element, method for producing optical waveguide element and method for producing periodic domain-inverted structure
US5943465A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 9, 1997 |
| Grant date | Aug 24, 1999 |
| Priority date | — |
| Expiry date | Apr 9, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2006/12183
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An excellent periodic domain-inverted structure formed on a ferroelectric optical single crystal substrate is provided having an improved crystalline property of the substrate and an improved resistance to optical damage and output of the domain-inverted structure and the like optical waveguide structure by forming protruded and recessed portions on a single-domained ferroelectric optical single crystal substrate 1, growing a film of a ferroelectric optical single crystal film 4 on the respective recessed portion of the single crystal substrate 1 by a liquid phase epitaxial growing process. At that time, the Curie temperature of the film 4 is lower than the liquid phase epitaxial growing temperature of the film 4, and the Curie temperature of the substrate 1 is higher than the liquid phase epitaxial growing temperature of the film 4, and the film 4 is polarized in an opposite direction to the polarization direction of the substrate 1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.