Hot-pressed transparent ceramics and ceramic lasers
US8277878B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 13, 2012 |
| Grant date | Oct 2, 2012 |
| Priority date | — |
| Expiry date | Jan 13, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2998
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A transparent polycrystalline ceramic having scattering and absorption loss less than 0.2/cm over a region comprising more than 95% of the originally densified shape and a process for fabricating the same by hot pressing. The ceramic can be any suitable ceramic such as yttria (Y2O3) or scandia (Sc2O3) and can have a doping level of from 0 to 20% and a grain size of greater than 30 μm, although the grains can also be smaller than 30 μm. Ceramic nanoparticles can be coated with a sintering aid to minimize direct contact of adjacent ceramic powder particles and then baked at high temperatures to remove impurities from the coated particles. The thus-coated particles can then be densified by hot pressing into the final ceramic product. The invention further provides a transparent polycrystalline ceramic solid-state laser material and a laser using the hot pressed polycrystalline ceramic.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.