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  • Black Chromium Coating

Photonics Spectra
Aug 2010
Optics Balzers AGRequest Info
For applications in medical device lens systems, Optics Balzers has unveiled the RoHS-compliant CrBlack chromium coating, a solution for reducing light scattering. The company has used the black chromium properties, to date applied predominantly in solar collectors and sunglasses, and adapted them to additional uses in medical devices and industry. The optically black coating is distinguished by its high absorption capacity and its minimized reflection in the visible range. Its color hue can be tailored to customers’ specific requirements. For example, a black chromium part with a blue component can be produced. The high adhesion of the coating on glass and metal in conjunction with its high application temperature of up to 250 °C enables uses in a variety of fields. The company’s CoatingPlus capabilities enable the coating to be patterned for demanding applications.


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The intermolecular attraction between two surfaces, as between a substrate and a coating; it is an important factor in the durability of optical thin films.
A noncrystalline, inorganic mixture of various metallic oxides fused by heating with glassifiers such as silica, or boric or phosphoric oxides. Common window or bottle glass is a mixture of soda, lime and sand, melted and cast, rolled or blown to shape. Most glasses are transparent in the visible spectrum and up to about 2.5 µm in the infrared, but some are opaque such as natural obsidian; these are, nevertheless, useful as mirror blanks. Traces of some elements such as cobalt, copper and...
A transparent optical component consisting of one or more pieces of optical glass with surfaces so curved (usually spherical) that they serve to converge or diverge the transmitted rays from an object, thus forming a real or virtual image of that object.
Return of radiation by a surface, without change in wavelength. The reflection may be specular, from a smooth surface; diffuse, from a rough surface or from within the specimen; or mixed, a combination of the two.  
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