Lithium niobate single crystal thin film and production method thereof
US5209917A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 17, 1991 |
| Grant date | May 11, 1993 |
| Priority date | — |
| Expiry date | May 17, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S117/918
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A lithium niobate single crystal thin film formed on a lithium tantalate substrate, in which the a-axis lattice constant of the lithium tantalate substrate and the a-axis lattice constant of the lithium niobate single crystal thin film are lattice matched. To achieve the lattice matching, the lithium tantalate substrate is contacted with a molten composition to epitaxially grow a lithium niobate single crystal thin film, the molten composition mainly comprising Li.sub.2 O, V.sub.2 O.sub.5, Nb.sub.2 O.sub.5, Na.sub.2 O and MgO, whereby the a-axis lattice constant of the lithium niobate single crystal thin film and the a-axis lattice constant of the lithium tantalate substrate are matched to each other. With this arrangement, a lithium niobate single crystal thin film with large thickness and low propagation loss can be obtained without poling, which could not be obtained with prior art methods, thus greatly contributing to the optical device industry.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.