SPATIALLY TUNABLE RUGATE NARROW REFLECTION BAND FILTER
Assignee
HUGHES AIRCRAFT COMPANY A CORP. OF DELAWARE
Filed
Apr 3, 1992
Granted
Jan 30, 1996
Location
BETHLEHEM CT US
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.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Apr 13, 1993
Rescinded
Aug 18, 1993
Duration
4 months
Inventor
- 1THOMAS D. RAHMLOW
Record Details
- Patent number
- US 5488511
- Application
- 07862858
- Aerospace match
- Yes
- Dataset source
- 35 USC §181 SO records
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