Stock material or miscellaneous articles – Composite – Of quartz or glass
Patent
1987-01-06
1988-09-06
Kittle, John E.
Stock material or miscellaneous articles
Composite
Of quartz or glass
428212, 428215, 428333, 428412, 428701, 350 16, 350164, 350601, B32B 1706, B32B 702, G02B 522, G02B 110
Patent
active
047692901
ABSTRACT:
An article of manufacture includes a substrate carrying at least two coating layers, one layer being of approximately quarter wave optical thickness, the other layer of approximately two quarter wave optical thickness, with the layers alternating between a material such as a dielectric having a first index of refraction and a second material such as a dielectric having a second index of refraction lower than the first index of refraction. These layers form a filtering system which removes narrow bands of light such as laser wavelengths by efficient reflection while permitting the remainder of the light spectrum to pass through the article. The coating layers have optical thicknesses and indices of refraction appropriate to reflect more than 99% of incident light at one or more predetermined wavelengths of light in the range of about 300 to about 1,200 nanometers and to transmit a substantial amount of all other incident light in the range. These articles are made by an electron beam evaporation technique under vacuum and under controlled conditions of temperature, partial pressure of oxygen, and deposition rates.
REFERENCES:
patent: 2412496 (1946-12-01), Dimmick
patent: 2552185 (1951-05-01), Koch
patent: 3410626 (1968-11-01), Magrath
patent: 3504959 (1970-04-01), Hennessey
patent: 4196246 (1980-04-01), Takayama et al.
patent: 4659178 (1987-04-01), Kyogoku
P. Baumeister et al, "Use of Hafnium Dioxide in Multilayer Dielectric Reflectors for the Near UV", Appl. Optics, vol. 16, No. 2, Feb. 1977, pp. 439-444.
Hettich Herbert L.
Pellicori Samuel F.
Karambelas A. W.
Kittle John E.
Laslo V. G.
Rucker Susan S.
Santa Barbara Research Center
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