US 11,945,757 B2
Multilayer coatings for optical ceramics
Michael W. Cason, North Chelmsford, MA (US)
Assigned to RAYTHEON COMPANY, Waltham, MA (US)
Filed by RAYTHEON COMPANY, Waltham, MA (US)
Filed on Jun. 20, 2019, as Appl. No. 16/447,229.
Prior Publication US 2020/0399187 A1, Dec. 24, 2020
Int. Cl. C04B 41/52 (2006.01); C04B 41/00 (2006.01); C04B 41/45 (2006.01); C04B 41/46 (2006.01); C04B 41/50 (2006.01); C04B 41/82 (2006.01); C04B 41/85 (2006.01); C04B 41/89 (2006.01); G02B 1/10 (2015.01); G02B 3/00 (2006.01); G02B 5/00 (2006.01); B29L 11/00 (2006.01)
CPC C04B 41/522 (2013.01) [C04B 41/009 (2013.01); C04B 41/4556 (2013.01); C04B 41/46 (2013.01); C04B 41/5003 (2013.01); C04B 41/82 (2013.01); C04B 41/85 (2013.01); C04B 41/89 (2013.01); G02B 1/10 (2013.01); G02B 3/00 (2013.01); G02B 5/00 (2013.01); B29L 2011/00 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An optical element, comprising:
an optical surface comprising a ceramic material;
a coating comprising a bifunctional molecule arranged on the optical surface, the bifunctional molecule comprising a first functional group and a second functional group, the first functional group forming a covalent bond to the ceramic material of the optical surface, and the second functional group comprising an aromatic functional group; and
a hydrophobic hybridized carbon material non-covalently bonded to the second functional group of the bifunctional molecule of the coating;
wherein the hydrophobic hybridized carbon material is non-covalently bonded to the second functional group of the bifunctional molecule of the coating by Pi stacking interactions; and
wherein the hydrophobic hybridized carbon material is non-covalently bonded to the second functional group and is indirectly bonded to the ceramic material of the optical surface.