Absorptive Optical Filter Glass
An optical filter removes unwanted spectral components or interfering light, reducing background interference, improving target-to-background contrast, and increasing signal-to-noise ratio. Two operating principles are intrinsic material absorption and optical interference, producing absorption and interference filters respectively. Filters are widely used in photography to emphasize subjects. For example, a yellow flower against blue sky and green leaves may lack prominence in an ordinary photograph. A yellow filter blocks some green and blue scattered light while passing more yellow light from the flower, making it stand out. A main feature is that dimensions can be quite large. Thin-film filters generally transmit longer wavelengths and are often infrared filters. Vacuum deposition alternates high- and low-index metal-dielectric-metal or all-dielectric films of controlled thickness on a substrate, forming low-order, multiple cascaded solid Fabry-Perot interferometers. Film materials, thicknesses, and arrangement are selected for the required center wavelength and transmission bandwidth λ.
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