Optical: systems and elements – Having significant infrared or ultraviolet property – Multilayer filter or multilayer reflector
Reexamination Certificate
2005-11-22
2005-11-22
Sikder, Mohammad (Department: 2872)
Optical: systems and elements
Having significant infrared or ultraviolet property
Multilayer filter or multilayer reflector
C359S350000, C359S361000
Reexamination Certificate
active
06967771
ABSTRACT:
Antireflection multilayer coatings with only three or four layers are proposed for the production of laser resistant optical components with minimal residual reflection and high transparency for UV light in a wavelength range approx. 150 nm to approx. 250 nm at large angles of incidence in the range of approx. 70° to approx. 80°, particularly in the range between approx. 72° and approx. 76°. For incident p-polarized UV light three-layer systems can be used, in which a layer of low refractive material, in particular magnesium fluoride is arranged between two layers of high refractive material and, in the case of the specified wavelength, of minimally absorbent material, in particular of hafnium oxide or aluminum oxide. For example, this allows a residual reflection of perceptibly less than 1% to be achieved in the case of a wavelength of 248 nm at angles of incidence in the range between approx. 72° and approx. 76°.
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H. Ganesha Shanbhogue, et al, “Multilayer antireflection coatings for the visible and near-infrared regions,” Applied Optics, Sep. 1, 1997, pp. 6339-6351, vol. 36, No. 25.
Kuschnereit Ralf
Paul Hans-Jochen
Carl Zeiss SMT AG
Sikder Mohammad
Sughrue & Mion, PLLC
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