Ferroelectric light frequency doubler device with a surface coating and having an inverted domain structure
US5715092A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1994 |
| Grant date | Feb 3, 1998 |
| Priority date | — |
| Expiry date | Jun 29, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/3775
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A ferroelectric light frequency doubler device has a surface coating on one surface of an initially uniformly poled ferroelectric crystal, the surface coating on the one surface being exposed to a scanning electron beam so as to form a spatially periodically alternating polarity domain structure in the crystal. The surface coating can be of an inorganic material or it can be of a polymeric organic material. The surface coating can be adapted to be patterned to form an optical grating in registrative alignment with the spatially periodically alternating polarity domain structure when such optical grating is desired. Alternatively, the surface coating may remain on the device as a protective coating, or it may be removed upon formation of the alternating polarity domain structure in the crystal. When the surface coating is adapted to be responsive to the scanning electron beam, the spatially periodically alternating domains in the ferroelectric crystal and a latent optical grating pattern in the surface coating are established at the same time by the electron beam. The latent optical grating pattern can be formed into an optical grating during a subsequent pattern development step.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.