Patent ID: 7700510

Claim:
An opto-ceramic comprising a mixture of two or more oxides of the type X 2 O 3 with X being selected from the group consisting of Y, Sc, Yb, In and Gd, said opto-ceramic comprising a crystal combination in which individual single crystallites have a cubic structure of the type Y 2 O 3 and said opto-ceramic being transparent to visible light and transparent to infrared radiation; wherein said opto-ceramic is free of each of Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er and Tm, said opto-ceramic has a transparency to said visible light of greater than 80 percent at a layer thickness of 2 mm and said opto-ceramic has a transparency to said infrared radiation of greater than 80 percent at a layer thickness of 2 mm.