Patent ID: 6890874

Claim:
An electro-optic ceramic material consisting essentially of the oxides of lead, magnesium, niobium, titanium, and lanthanum wherein the electro-optic material has a propagation loss of less than about 3 dB/cm and a quadratic electro-optic coefficient of greater than about 2×10 −16 m 2 /V 2 at 20° C. at a wavelength of 1550 nm, and wherein the ceramic material has a lead cation fraction of between about 0.40 and about 0.51; a lanthanum cation fraction of between 0.02 and about 0.06; a magnesium cation fraction of between about 0.06 and about 0.19; a niobium cation fraction of between about 0.16 and about 0.36; and a titanium cation fraction of between about 0.02 and about 0.27.