Thomas E Hartnett

US Patent:

20120225767, Sep 6, 2012

Filed:

Mar 4, 2011

Appl. No.:

13/040555

Inventors:

Jiyun C. Imholt - Methuen MA, US
Richard L. Gentilman - Acton MA, US
Thomas M. Hartnett - Nashua NH, US

International Classification:

G02B 1/00
C04B 35/00

US Classification:

501 1, 264 121

Abstract:

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.

US Patent:

20220259107, Aug 18, 2022

Filed:

Jan 25, 2022

Appl. No.:

17/648921

Inventors:

- Waltham MA, US
Stephanie Silberstein Bell - North Andover MA, US
Christopher S. Nordahl - Littleton MA, US
Thomas M. Hartnett - Nashua NH, US
Richard Gentilman - Acton MA, US
R. Wesley Jackson - Mystic CT, US

International Classification:

C04B 35/505
C04B 35/04
C04B 35/626

Abstract:

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.