Simply adding a half-wave of low-index material (normally silicon dioxide) as the final layer can result in measurably higher damage thresholds. Though in pure form it can be weak, chemical treating and alloying processes drastically increase its strength. The Kepler Mission sought to explore the structure and diversity of planetary systems. Isopropyl alcohol or acetone can be used to clean our protected metal coated mirrors. Reflectivity is inversely proportional to emissivity, which means that the more emissive a mirror is, the less reflective it is. Second surface mirrors (Figure 2) can be manufactured using similar coating technology, but the incident light first passes through a transparent substrate material before it is reflected by the coating. The dielectric layer(s) can also be designed to enhance the reflectance of the metal coating in specific spectral regions. 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. 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. Bare or Protected Gold offers high reflectance for near­Infrared (NIR) and Infrared wavelengths. 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. New material for mirror coating - posted in ATM, Optics and DIY Forum: Here is something new: https://blogs.scienc...its-a-weird-one As the title says, a new form of carbon was recently discovered. 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. Our standard metallic mirror coatings include Protected Aluminum, Enhanced Aluminum, UV Enhanced Aluminum, DUV Enhanced Aluminum, Bare Gold, Protected Gold, and Protected Silver. Since glass possesses the property of uniformity, especially when it is polished, it is an ideal material for mirrors. 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%. 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. But the customer also needs to be aware that the choice of coating materials for high-power applications is limited. As one of the only telescopes to use silver mirrors, the Gemini Observatory is achieving significant infrared optimization. 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. While glass is the major component of mirrors, it is actually a poor reflector. Reflection at the substrate leads to ghost images, indicated by the dashed orange line. Classified as a noble metal, silver possesses many inherent benefits that make it a versatile plating material. Edmund Optics® is a leading designer and manufacturer of laser coatings for mirrors, beamsplitters, windows, and other optical components. Two crucial aspects of a mirror’s performance are its reflectivity, how much light it reflects, and emissivity, the energy radiated from its surface. To meet the technical demands of your requirements, we use several different plating techniques including autocatalytic, electroplating and electroless methods. Researchers studying the Gemini telescopes have determined that a silver mirror coating is effective for observing infrared and visible spectrum wavelengths, however, the properties of silver may tend to over-absorb ultraviolet light. Our world class manufacturing facilities are able to produce substrates with surface accuracies of < λ/20, surface qualities of 10-5, parallelism of <0.5 arcseconds, and surface roughness of <5 Angstroms in any glass and most crystalline substrates. Protected Silver provides the highest reflectance between 500 – 800nm and also performs well in near-Infrared and Infrared 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. Our standard metallic mirror coatings include Protected Aluminum, Enhanced Aluminum, UV Enhanced Aluminum, DUV Enhanced Aluminum, Bare Gold, Protected Gold, and Protected Silver. These coatings can be optimized for use as first or second surface mirrors or adjusted for specified wavelength or angle of incidence ranges. These plasma-enhanced barriers can be applied to optical mirrors that require high reflectivity and absorbency. All of these types of reflective coatings can be applied to Glass, Molded and Diamond-turned Plastic, or Metal substrates. We offer a variety of single and multi-layer coatings including broadband, v-coat, polarizing, metallic, and narrow bandpass in the UV, visible, and IR spectra. To keep the surface of the aluminum from oxidizing, layers of magnesium fluoride coat the top aluminum layers. Protected Aluminum and Enhanced Aluminum are typically used for visible applications. All specified damage threshold values have been obtained by testing multiple coating runs to ensure an accurate result. For instance, though aluminum may offer a higher rate of reflection, silver may offer lower emissivity. Laser, flat, metal substrate, focusing, or specialty mirrors in a range of reflective coating options, including aluminum, silver, gold, or dielectric. From standard to custom coatings, Plaskolite sets the industry standard for quality. EMF’s metallic mirror coating allows you to choose the optimum spectral range of reflectivity and durability for both large and small components. This treatment provides an abrasion-resistant surface while maintaining the performance of aluminum mirror. A coated optical mirror can become more emissive if its coating tarnishes, oxidizes or is rough rather than smooth.