Barium strontium titanate photorefractive device and method for making the same
US5287213A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 1993 |
| Grant date | Feb 15, 1994 |
| Priority date | — |
| Expiry date | Feb 11, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2001/0268
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention relates to a photorefractive device made of single crystal of which the chemical composition substantially is Ba.sub.1-x Sr.sub.x TiO.sub.3 (0.01<x<0.1 BST) The method for manufacturing said device comprises: growing BST single crystal by Czochralski technique; annealing said crystal in oxidizing atmosphere; machining said crystal into cuboid with polished surfaces; poling said cuboid mechanically and electrically into single-domain state. Said device may ba a piece of said single-domain crystal, or an optoelectronic assembly including at least one of said crystal as the core part. Performances of said device are similar to the one made of BaTiO.sub.3. A reflectivity as high as 52% has been reached using said device as a self-pumped phase conjugator. Compared to BaTiO.sub.3, the method for manufacturing BST crystal according to the invention has advantages such as shorter typical growth period of 3-4 days, simpler requirement for equipment and technique, higher yield, and easier to obtain crystal cuboid with larger dimensions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.