Claims
- 1. A multilayer coating system for the absorption of infrared energy and particularly adapted for application to a sapphire substrate which consists essentially of:
- (A) A vacuum deposited, opaque, first layer of titanium about 2000 to 3000 A in thickness;
- (B) A vacuum deposited, semitransparent, third layer of titanium about 140 A in thickness;
- (c) A vacuum deposited, dielectric, second layer of aluminum oxide about one quarter wave optical thickness at 2.8 micrometers positioned between and in contact with said first and third layers; and
- (d) a vacuum deposited, dielectric, fourth layer superposed on said third layer.
STATEMENT OF GOVERNMENT INTEREST
The invention described herein may be manufactured and used by or for the Government for governmental purposes without the payment of any royalty thereon.
US Referenced Citations (4)