Method for fixing optical information in crystals and for quasi-phase matching in frequency mixing
US5691829A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 17, 1995 |
| Grant date | Nov 25, 1997 |
| Priority date | — |
| Expiry date | Oct 17, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/3558
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method and apparatus for fixing images, holograms and domain gratings in crystals by application of an electric field on a crystal and simultaneous illumination of it with a light pattern. The fixing procedure is based on a screening effect. The modulation of the domains may be perpendicular to the c-axis. Another application of the method is in frequency mixing such as second harmonic generation and parametric processes, by overcoming the problem of phase matching using the domain gratings. Thus, it is possible to obtain controllable broadband mixing and tailored quasi-phase matching for several wavelengths or for prespecified wavelength tuning ranges and frequency widths.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.