Corning Incorporated

James R Cole

Michael Lucien Genier

Robert Stephen Pavlik, Jr

Michael William Price

William Rogers Rosch

Keith J Donohue

Jeffrey L Sunderland

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 CaFas the major component and Mg in an amount in the range of 13 ppm to 20 ppm while Ce and Mn are &#x3c;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 &#x3b3;-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.

Calcium fluoride optics with improved laser durability

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 consist of CaFas the major component and, in one embodiment, at least one dopant/amount selected &#x3e;0.3-1200 ppm Mg, &#x3e;0.3-200 ppm Sr, &#x3e;0.3-200 ppm Ba, while Ce and Mn are &#x3c;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 &#x3b3;-radiation.

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Norwood, NY, United States of America

James R Cole