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AssigneeCorning Incorporated
InventorsJames R. Cole, Keith J. Donohue, Michael Lucien Genier, Robert Stephen Pavlik, JR., Michael William Price, William Rogers Rosch, Jeffrey L. Sunderland
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The invention is directed to calcium fluoride crystal optics with improved laser durability that can be used for the transmission of below 250 nanometer (nm) electromagnetic radiation. The optics consists of CaF2 as the major component and Mg in an amount in the range of 13 ppm to 20 ppm while Ce and Mn are <0.5 ppm. The doped crystal and optics made therefrom have a ratio of 515/380 nm transmission loss of less than 0.3 after exposure to greater than 2.8 MRads of γ-radiation. Further, the doped crystal and optics made therefrom exhibit a greatly improved lifetime as shown by ALDT testing to at least 1 billion pulses.
A laser optic having improved laser durability, said optic consisting essentially of a CaF2 crystal material doped with Mg in an amount in the range of 13 ppm to 250 ppm, said optic having a ratio of 515/380 nm transmission loss of less than 0.3 after exposure to greater than 2.8 MRads of γ-radiation.
A doped CaF2 crystal suitable for making laser optics having improved laser durability, said crystal consisting of CaF2 as the major component and 13-250 ppm Mg, wherein the doped single crystal has a ratio of 515/380 nm transmission loss of less than 0.3 after exposure to greater than 2.8 MRads of γ-radiation.
Dependencies are inferred from the claim text.