Optical: systems and elements – Light interference – Produced by coating or lamina
Patent
1992-04-03
1996-01-30
Hellner, Mark
Optical: systems and elements
Light interference
Produced by coating or lamina
359589, G02B 110, G02B 528
Patent
active
054885116
ABSTRACT:
An optical filter (10) has a radiation receiving surface, the filter including a rugate reflection filter having a reflection wavelength characteristic 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. Two or more rugate subfilms may overlap one another, or none of the rugate subfilms may overlap. 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 spectral ranges, a third optical density within a region wherein at least two subfilms overlap one another. The third optical density is a summation of the first optical density and the second optical density.
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"Spectral Response Calculations of Rugate Filters Using Coupled-Wave Theory", 1988 Optical Society of America, vol. 5(9), 1558-1564 (Sep. 1988) pp. 560-566; W. H. Southwell.
Denson-Low W. K.
Hellner Mark
Hughes Aircraft Company
Schubert W. C.
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