Optical coatings for high temperature applications

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

1985-08-07

1987-05-05

Chatmon, Saxfield

Electric lamp and discharge devices

With optical device or special ray transmissive envelope

Polarizer or special ray transmission

350 16, 362293, 313580, H01J 516, H01J 6140, H01K 126, H01K 130

Patent

active

046635572

ABSTRACT:
A coated article useful in high temperature environments substantially in excess of 500.degree. C. comprising a substantially transparent substrate formed of a material adapted to withstand said high temperature environment and an optical coating 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 primarily 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.

REFERENCES:
patent: 3660137 (1972-05-01), Furuuchi et al.
patent: 3848152 (1974-11-01), Schultz
patent: 4017758 (1977-04-01), Almer et al.
patent: 4229066 (1980-10-01), Rancourt et al.
patent: 4524410 (1985-06-01), Kawakatsu et al.
patent: 4535269 (1985-08-01), Tschetter et al.
patent: 4588923 (1986-05-01), Hoegler et al.

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