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Hot-pressed transparent ceramics and ceramic lasers

Patent image
NRL

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 further provides 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. In a process for making a transparent polycrystalline ceramic in accordance with the present invention, 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.

Inventors: 
Sanghera, Jasbinder S.; Villalobos, Guillermo R.; Kim, Woohong; Bayya, Shyam S.; Aggarwal, Ishwar D.; Sadowski, Bryan
Patent Number: 
Technical domain: 
Materials and Coatings
FIle Date: 
2009-11-18
Grant Date: 
2012-01-31
Grant time: 
804 days
Grant time percentile rank: 
14
Claim count percentile rank: 
2
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY