Optical: systems and elements – Having significant infrared or ultraviolet property – Multilayer filter or multilayer reflector
Patent
1992-03-24
1993-01-12
Arnold, Bruce Y.
Optical: systems and elements
Having significant infrared or ultraviolet property
Multilayer filter or multilayer reflector
359584, 359585, 359589, 359884, G02B 522
Patent
active
051794691
ABSTRACT:
A thin film, light absorbing coating comprises an analog structure fabricated by the simultaneous codeposition of absorbing and non-absorbing material. The two materials may comprise a non-absorbing dielectric material, such as silicon monoxide, and a metal, such as chromium, that is absorbing over the desired wavelength range. Individual evaporation rates for the two materials are adjusted during the codeposition process to achieve a continuously graded quintic transition between the absorbing material and the non-absorbing material. The continuous grading of the composition allows good light absorption properties to be maintained over a wide range of wavelengths. The total design thickness of the absorbing coating is on the order of a full wavelength of light. All wavelengths of incident light shorter than the design wavelength are absorbed into the coating. The coating is useful as a broad band light absorbing layer between a substrate and a spectrally selective reflective surface layer.
REFERENCES:
patent: 3959548 (1976-05-01), Bernal
patent: 4583822 (1986-04-01), Southwell
patent: 4925259 (1990-05-01), Emmett
patent: 4934788 (1990-06-01), Southwell
patent: 5004308 (1991-04-01), Hall et al.
Gunning William J.
Hall Randolph L.
Arnold Bruce Y.
McFarren John C.
Rockwell International Corporation
Ryan J. P.
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