Spatially tunable rugate narrow reflection band filter and appli

Details Spatially tunable rugate narrow reflection band filter and appli Spatially tunable rugate narrow reflection band filter and appli

1992-04-03

1995-07-11

Hellner, Mark

Optical: systems and elements

Light interference

Produced by coating or lamina

359586, 359589, G02B 500

Patent

active

054326389

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.

REFERENCES:
patent: 2708389 (1955-05-01), Kavanagh
patent: 3442572 (1969-05-01), Illsley et al.
patent: 4187475 (1980-02-01), Wieder
patent: 4346992 (1982-08-01), Schwartz
patent: 4583822 (1986-04-01), Southwell
patent: 4952025 (1990-08-01), Gunning, III
patent: 4957371 (1990-09-01), Pellicori et al.
patent: 5004308 (1991-04-01), Hall et al.
patent: 5181143 (1993-01-01), Southwell
"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.

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