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Photonics Spectra
Jan 2007
Edmund Optics Inc.Request Info
Edmund_coatings.gifEdmund Optics has added a visible 0° antireflection coating option to its Tech Spec planoconvex and -concave, double-convex and -concave and achromatic lines. The coating features an average reflectance of less than 0.4% over the spectral band from 425 to 675 nm. The planoconvex line offers effective focal lengths of 4 to 750 mm for diameters of 4 to 25 mm; the planoconcave, focal lengths of –12 to –100 mm for diameters of 12 to 25 mm; the double-convex, focal lengths of 4.5 to 400 mm for diameters of 4.5 to 25 mm; and the double-concave, focal lengths of –6 to –100 mm, for diameters of 6 to 25 mm. All focal lengths have 1% tolerance. The achromats offer focal lengths of 10 to –150 mm (2% tolerance) for diameters of 6.25 to 30 mm.


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antireflection coating
A thin layer of material applied to a lens surface to reduce the amount of reflected energy. Ideally the index of refraction of that material should be equal to the square root of the product of the indices of the material on either side of the coating, while the ideal thickness for a single-layer coating is one-quarter of the wavelength at which reflectance is to be minimized. See also multilayer coating.
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