The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 02, 2012
Filed:
Jan. 13, 2012
Jasbinder S. Sanghera, Ashburn, VA (US);
Guillermo R. Villalobos, Springfield, VA (US);
Woohong Kim, Lorton, VA (US);
Shyam S. Bayya, Ashburn, VA (US);
Bryan Sadowski, Falls Church, VA (US);
Ishwar D. Aggarwal, Charlotte, NC (US);
Jasbinder S. Sanghera, Ashburn, VA (US);
Guillermo R. Villalobos, Springfield, VA (US);
Woohong Kim, Lorton, VA (US);
Shyam S. Bayya, Ashburn, VA (US);
Bryan Sadowski, Falls Church, VA (US);
Ishwar D. Aggarwal, Charlotte, NC (US);
The United States of America, as represented by the Secretary of the Navy, Washington, DC (US);
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 (YO) or scandia (ScO) 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.