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US 4,379,622 AGranted
Broad band phase shift system
AssigneeCoherent, Inc.
InventorsDennis G. Fischer, Arnold L. Bloom
Life of this patent
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Abstract
A broad band phase shifting system, having a fixed angle of phase retardation, has at least one broad band reflecting means in the system. The broad band reflecting means also has an angle of phase retardation, with the angle of phase retardation of the reflecting means less than the fixed angle of phase retardation of the system.
Claims2
A broad band phase shift system having phase retardation of substantially ninety degrees comprising:
- two substantially identical reflecting means, each having an angle of phase retardation of substantially forty-five degrees;
- each reflecting means comprising:
- a substrate of a material having high reflectivity;
- a plurality of first dielectric material having low refractive index;
- a plurality of second dielectric material having high refractive index;
- and
- said first and second dielectric materials on said substrate in alternate layers.
4 more elements
Dependencies are inferred from the claim text.