Household mirrors are used to allow individuals to examine their appearance and may also be used as room decorations. With the highest reflectance of any metal in the ultraviolet and infrared spectral ranges, aluminum only falls behind silver in the visible light and near-infrared ranges. The differences between household mirrors and optical mirrors are key to accomplishing their intended goals. Though each plating process has its differences, both aluminum and silver coating can offer unique benefits that improve the functionality of optical mirrors. Standard protected aluminum is our most popular mirror coating for applications in the visible and near infrared. This geometry helps protect the coating layer from scratches and oxidization but leads to several other important issues that make this type of mirror unsuitable for most precision optics applications: Metal coatings are typically very delicate without a protective coating and require extra care during handling and cleaning. Dark Chrome Coating - AC230 See what EO has to offer. A dielectric overcoat on a metallic mirror allows for improved handling of the component, increases the durability of the metal coating and provides protection from oxidation with little impact to the performance of the metal coating. Check out what we can do for you. Today most mirrors are coated with chrome or aluminum. Most expensive is gold, which gives excellent (98%-99%) reflectivity throughout the infrared, but limited reflectivity at wavelengths shorter than 550 nm, resulting in the typical gold colour. The film can be either opaque to create a high-quality reflective surface, or semi-transparent for two-way visibility, also known as a two-sided mirror. 400 W Nationwide Blvd, Suite 400 The design of the coating can significantly alter the damage threshold. Edmund Optics® is a leading designer and manufacturer of laser coatings for mirrors, beamsplitters, windows, and other optical components. As the least expensive precious metal, silver is used in the automotive, telecommunications, electronics and solar power industries as a substitute for other metals like gold and palladium. Edmund Optics® manufactures a wide range of precision parabolic, spherical, and flat mirrors with a number of different substrate materials. Notch Filter: R >90% at Center Wavelength (CWL), FWHM < 0.12 CWL, T, Custom Coatings Available for Wavelengths between 300-1800nm (BBHR) and 350-850nm (Notch), Maximum Reflectance at 1 or 2 Customer Selected Wavelengths from 190-3000nm (Single Line) or 350-1700nm (Dual Line), Single Line: R >99.5%, at Design Wavelength, Dual Line: R >98.5%, at Both Wavelengths of Interest, Partial Reflectance from 5%R to 95%R, per Customer Requirement, Reflectance Specification: R% = ±2%; Typical: R% = ±1%. A thin film of aluminum is applied to the substrate, and is protected by a clear protective coating. Choosing a material for high-index layers is not as straightforward: oxides of titanium, tantalum, zirconium, hafnium, scandium, and niobium are all popular high-index materials. Top Specs for Coatings on Plastic. Standard protected aluminum is our most popular mirror coating for applications in the visible and near infrared. Specialty mirrors are made from a slightly different type of glass and coated with other materials. Various coatings are used to increase the reflection properties of an optical system. It has the highest known electrical and thermal conductivity, as well as high malleability and ductility. Call Sharretts Plating Company and receive a free quote today! Bare aluminum can be used in optical mirrors for telescopes in space to achieve larger bandwidths of light. The dielectric layer(s) can also be designed to enhance the reflectance of the metal coating in specific spectral regions. Die Edmund Optics GmbH Deutschland fungiert als Handelsvermittler für die Edmund Optics Ltd. in Großbritannien. Optical mirrors, however, must be much more versatile due to their utility in industrial and manufacturing applications. The multi-layer film also provides the improved handling characteristics of the protected aluminum coating. While glass is the major component of mirrors, it is actually a poor reflector. Bare or Protected Gold offers high reflectance for near­Infrared (NIR) and Infrared wavelengths. As full-service plating business, we dedicate our skill and expertise to enhancing our customer’s competitive positions. The core structure of high-reflection coatings is typically a repeating stack of high- and low-index layers, each a quarter-wavelength thick. Though each plating process has its differences, both aluminum and silver coating can offer unique benefits that improve the functionality of optical mirrors. As a coating for optical mirrors, silver may outperform traditional aluminum coatings. Typical R> 99.9%, AccuCoat inc. is a world-class optical coating facility producing a wide range of thin-film optical coatings such as anti-reflective, beamsplitter, dichroic & metal mirror, filter coatings, and IR coatings. EMF Edge. These coatings can be optimized for use as first or second surface mirrors or adjusted for specified wavelength or angle of incidence ranges. The surface of an unprotected metal coating should never be touched or cleaned with anything but clean, dry air. Because of this unreliability, protective coatings are often placed over the bare aluminum. First surface mirrors are recommended for use in precision optics applications. This coating is ideal for applications requiring increased reflectance from 400 – 650nm while the UV and DUV Enhanced Aluminum coatings yield increased reflectance from 120 – 400nm range. Protection, reflection, scratch resistance, anti-fog; Plaskolite coatings enhance substrates. Though the presence of oxygen may cause aluminum to corrode, even if the aluminum does have an additional protective coating, there is hope that future optical mirrors used in an astronomic application could be positioned far enough from the Earth not to be impacted by these environmental factors. For example, the Gemini Observatory has switched from using an aluminum coating on their telescopes to a silver coating.

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