Optical coatings for high temperature applications

Details Optical coatings for high temperature applications Optical coatings for high temperature applications

H - Electricity

01

J

117/157, 313/84

H01J 61/40 (2006.01) G02B 5/28 (2006.01) H01K 1/32 (2006.01)

Patent

CA 1177704

ABSTRACT OF THE DISCLOSURE A coated article useful in high temperature environments substantially in excess of 500°C comprising a substantially transparent substrate formed of a material adapted to with- stand said high temperature environment and an optical coat- ing formed on one surface of said substrate and comprising a first set of layers consisting at least primarily of silicon dioxide and a second set of layers consisting at least pri- marily of tantalum pentoxide. The optical coating comprises an interference filter formed of alternating layers of fused silica and tantalum pentoxide. A halogen cycle lamp with visible light transmitting, IR reflecting filter formed on the outside surface of the lamp envelope improves energy efficiency by at least twenty-five percent.

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