SPATIALLY TUNABLE RUGATE NARROW REFLECTION BAND FILTER AND APPLICATIONS THEREFOR

Abstract

An optical system (20) includes an optical filter (10) having a radiation receiving surface. The filter including a rugate reflection filter having a reflection wavelength characteristic that varies along an axis of the radiation receiving surface. The optical filter includes a plurality of serially disposed rugate coatings (10b, 10c) and has a wavelength rejection gradient that exhibits a linear, logarithmic, or power function of wavelength rejection as a function of position on the radiation receiving surface. The filter has a first optical density associated with a first one of the subfilms, a second optical density associated with a second one of the subfilms, and, for overlapping subfilms, a third optical density within a region wherein at least two subfilms overlap one another. The third optical density is a function of the first optical density and the second optical density. The filter is translated along one or more axes thereof for providing a tunable rejection of incident laser threat radiation.

Source: Google Patents

35 USC §181 Secrecy Order

Inventor

• 1THOMAS D. RAHMLOW

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