Infrared neutral-density filter having copper alloy film

Details Infrared neutral-density filter having copper alloy film Infrared neutral-density filter having copper alloy film

1995-07-25

1998-03-10

Shafer, Ricky D.

Optical: systems and elements

Having significant infrared or ultraviolet property

359888, 428457, 428697, 252587, G02B 300

Patent

active

057267979

ABSTRACT:
A neutral-density optical filter has a dielectric substrate and a film costing essentially of copper and nickel. The film is preferably formed of Constantan, which is 55% copper and 45% nickel. The filter achieves a high optical density with a low spectral variation.

REFERENCES:
patent: 2774421 (1956-12-01), Lion
patent: 3731759 (1973-05-01), Carlson
patent: 4328068 (1982-05-01), Groth
patent: 5018833 (1991-05-01), Bennett et al.

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