Bandpass filter structure

The bandpass filter is prepared by depositing multilayer optical materials on the substrate surface. In general, multiple media membrane stacks are separated by a compartment. The dielectric film stack is composed of a large number of dielectric material layers with high refractive index and low refractive index alternately. The thickness of each film in the dielectric film stack is λ/ 4, of which, λ Is the central wavelength of the bandpass filter (that is, the wavelength corresponding to the maximum transmittance of the filter). The spacer layer is located between the dielectric film stacks with a thickness of (n λ)/ 2, where n is an integer. The spacer layer can be colored glass, epoxy resin, dye, metal or dielectric layer. The Fabry-Perot cavity is composed of two dielectric film stacks and a spacer layer in the middle. The filter is installed in a marked metal ring, which can protect the filter and is easy to operate.
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Hanzhong Brisun Optics Co., Ltd. Is the high precision optical element manufacturer provides customized production of Various optical lenses, including spherical lens, cylindrical lens, optical window, mirror, prism, filter, metal base mirror and other high-precision optical elements. The base materials include various optical glass, fused quartz, calcium fluoride (CaF2), zinc selenide (ZnSe), germanium (GE), silicon (SI), sapphire, metal and other materials. And provide antireflective film, high reflection film, spectroscopic film, metal film and other optical coatings.

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