Raytheon Company

Surmet Corporation

Thomas M Hartnett

Richard L Gentilman

Christopher S Nordahl

Edward A Maguire, Jr

Stephanie Silberstein Bell

Matthew A Morton

Kenneth David Smith

Gerhard Sollner

Joseph M Wahl

Jason D Adams

Derrick J Rockosi

Brian J Zelinski

Jiyun C Imholt

Eric K Riedel

R Wesley Jackson

Jeremy Wagner

Poornima Varadarajan

Evelina Aleksandro Polyzoeva

A nanocomposite optical ceramic (NCOC) material. The material having a first solid phase, a second solid phase, and a third solid phase. The first solid phase has first solid phase grains no larger than 5 μm, and each first solid phase grain has a first solid phase grain boundary. The second solid phase has second solid phase grains no larger than 5 μm, and each second solid phase grain has a second solid phase grain boundary. The third solid phase has a doping agent. The doping agent is less than 5 atomic % soluble in the first solid phase and the second solid phase. At least part of the third solid phase is situated at the second solid phase grain boundary.

Al additions for grain pinning in Y2O3—MgO

A method of bonding includes applying a glass composition to at least a first material surface. The glass composition includes a glass powder and a solvent. The first material surface is disposed onto a second material surface. An elevated temperature is applied to the first material surface and the second material surface to form a bond between the first material surface and the second material surface. The first material surface and the second material surface are compressed under an isostatic pressure.

Bonding scintillator material to produce large panels or other shapes

Methods and apparatus for a frequency selective limiter (FSL) having a magnetic material substrate that tapers in thickness and supports a transmission line that has segments and bends. The segments, which differ in width and are substantially parallel to each other, such that each segment traverses the substrate on a constant thickness of the substrate.

Transversely tapered frequency selective limiter

Various embodiments disclosed relate to an optical window including an infrared light transmissive optical material. The optical material includes a first ceramic phase including a first ceramic material and a first dopant distributed therein. The optical material further includes a second ceramic phase homogenously intermixed with the first ceramic phase and comprising a second ceramic material and a second dopant distributed therein. The first dopant increases the refractive index of the first ceramic material and the second dopant decreases the refractive index of the second ceramic material. The first dopant and the second dopant are present in an amount such that a difference in a refractive index of the first ceramic phase and of the second ceramic phase is in a range of from about 0.001 to about 0.2.

Multi-phase infrared transparent ceramic material

A solid solution-based optical material capable of transmitting infrared light, the solid solution-based optical material comprising at least two nano-sized phases intermixed in one another, wherein at least one of the at least two nano-sized phases is a solid solution containing a dissolved dopant, the dissolved dopant present in an amount sufficient to reduce a refractive index difference between the at least two nano-sized phases to about 0.2 or less when infrared light is being transmitted. Various embodiments are directed to related systems and methods. In one embodiment, the infrared light is visible infrared light, short-wave infrared light, eye safe infrared light, medium wave infrared light, long wave infrared red light, or combinations thereof.

Solid solution-based nanocomposite optical ceramic materials

In accordance with the present embodiment, a method for making an optical ceramic comprises depositing a plurality of thin layers of powder. The powder comprises a first optical material powder having a first dopant level, and a second optical material powder. The first and second optical material powders are deposited for each layer based on the first dopant level and according to data associated with a three-dimensional (3D) compositional profile design of an optical ceramic. The method further comprises binding the first and second optical material powders of each thin layer to each other and each thin layer with an adjacent layer such that a green state optical ceramic is produced based on the 3D compositional profile design. The method further comprises densifying the green state optical ceramic to obtain the optical ceramic.

Method of fabricating optical ceramics containing compositionally tailored regions in three dimension

A method of making aluminum oxynitride includes introducing a mixture having aluminum oxide and carbon into a chamber, agitating the mixture within the chamber, and heating the mixture to make aluminum oxynitride.

Method of making aluminum oxynitride

A method of preparing substantially homogeneous aluminum oxynitride powder is provided comprising the steps of reacting gamma aluminum oxide with carbon in the presence of nitrogen, and breaking down the resulting powder into particles in a predetermined size range. A method of preparing a durable optically transparent body from this powder is also provided comprising the steps of forming a green body of substantially homogeneous cubic aluminum oxynitride powder and sintering said green body in a nitrogen atmosphere and in the presence of predetermined additives which enhance the sintering process. Preferred additives are boron, in elemental or compound form, and at least one additional element selected from the group of yttrium and lanthanum or compounds thereof. The sintered polycrystalline cubic aluminum oxynitride has a density greater than 99% of theoretical density, an in-line transmission of at least 50% in the 0.3-5 micron range, and a resolving angle of 1 mrad or less.

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Nashua, NH, United States of America

Thomas M Hartnett