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Multispectral electro-optical/infrared payloads are being developed for a variety of defence and commercial system applications. Many applications depend on their ability to detect and recognize low-contrast and distant targets in a complex environment. The development of such systems necessitates the use of specialized optical filters capable of separating different spectral bands. To separate the bands from visible to mid-wave infrared (MWIR), a dichroic beam splitter is used. We have designed and simulated these two beam splitters with a 45-deg angle of incidence that will be used to separate the bands from visible to MWIR. The beam splitter in such an optical system must separate visible, short-wave infrared (SWIR), and MWIR. We present the thin-film coating design and simulation of these two beam splitters. The first beam splitter separates MWIR from visible and SWIR. The second beam splitter separates the remaining two bands: visible and SWIR.
In this paper, the design and simulation of a Linear Variable Optical Filter (LVOF) for the visible and near-infrared (VNIR) 450-900nm region is reported. The design and simulation of LVOF are made based on all-dielectric [1][2][3][4] and metal-dielectric based induced transmission lter. In the given paper, we have compared the design approach based on all-dielectric and metal-dielectric lters. The LVOF lter based on the metal-dielectric method reduces the design and fabrication complexities and is also cost-effective as it doesn't require any band rejection lters. The minimum spectral transmission of the metal-dielectric lter reported in the paper is 70% with a FWHM of 2-3% of central maxima.
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