Ar Coating

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For five decades, A. Optical Components Ltd. has made a name for themselves as world-leading manufacturers of custom-made optics solutions. The products that they make are custom-made for industrial applications. The company has a whole range of products ג€“ lenses, optical domes, optical windows, prisms, beam splitters, optical wedges, mirrors, and filters. It also offers optical coating, particularly mirror coating and anti-reflective (AR) coating. This article shall focus on the different types of AR coatings that A. Optical Components offer to their clients. Anti-reflective (AR) coating is an extremely helpful option as it vastly improves the competence of any optic product. This efficient coating increases transmission, enhance contrast and eliminates ghost images. Most AR coatings are durable and are able to resist physical and environmental damage. For AR coatings, A. Optical usually adhere to clientsג€™ requests. However, the specialists usually remind the client that they should be fully aware of the full spectral range of their system. While AR coating can significantly improve the performance of an optics system, when the coating is applied at wavelengths beyond the design wavelength range will potentially decrease optics system performance.

Here are the types of AR Coating that A. Optical offers its clients:

  • Magnesium Fluoride (MgF2) AR Coating
Single layer MgF2 coating is applied to substrate materials having an index of refraction in the range of 1.45-1.85 within spectral range 200-1600nm. Here are the coating characteristics of Magnesium Fluoride (MgF2): The extent of the reflectance reduction depends on the substrate refractive index. For a typical crown glass with a refractive index of 1.52, the reflectance is reduced from 4.2% to the minimum value of 1.3%.ֲ  For flint glass with a refractive index of 1.85, the reflectance is reduced from 8.9% to the minimum value of 0.1%.
  • V-type narrow-band AR coating
V-coatings are multilayer, and it is V-coat designed in order to handle high powers in the UV spectrum. It is fabricated using hard electron beam deposited dielectric materials. This type of AR coatings is designed to minimize reflectance over a narrow wavelength range. This type of coating can be applied to a variety of transparent optical materials in the range 250-2000 nm. Here are its coating characteristics: Reflectance: less than 0.25% per surface at the specified single wavelength. Transmittance per surface: greater than 99.7% at the specified single wavelength.
  • Broadband AR coating for IR and visible range
This broadband, dielectric AR coating is designed to minimize reflectance over a broad wavelength range of 430-900 nm and substrates with refraction index in the range of 1.51 ג€“ 1.55. The coating can be extended to the higher refractive indexes of the substrates and it can also be applied to a variety of transparent optical materials in the range of 400 ג€“ 2000nm. Here are its coating characteristics (for substrates with n = 1.51 ג€“ 1.55) Average reflectance: less than 0.8% per surface in the range of 450 ג€“ 900 nm. Maximum reflectance: less than 1.0% per surface in the range of 450 ג€“ 880 nm. Average transmittance (per surface): greater than 99.0% in the range 450 ג€“ 900 nm.
  • Extreme Broadband AR coating for IR and visible range
This dielectric, AR coating is designed to minimize reflectance over an extremely broad wavelength range of 450 ג€“ 1100 nm. The coating can be applied to a variety of optical materials transparent in the range of 200 ג€“ 2000 nm and refraction index in the range of 1.51 to 1.55. A.Optical very carefully follows set specifications and standards when it comes to AR Coating.ֲ  For coating defects caused by the coating of an optical element such as coating scratches, voids or pinholes and dust or stain, they are considered with the scratch and dig specifications of that certain element. Coating defects are allowed if their size is within the stated scratch and dig tolerance.