Anti-Reflective Coatings

Anti-Reflective Coatings

Anti-Reflective Coatings

The reflectivity of an optical surface can be reduced by adding one or more non-absorbing dielectric thin film coatings. Anti-reflective coatings take advantage of the electromagnetic-wave properties of light to enhance transmittance. AR coatings improve the efficiency of optical instruments, enhance contrast in imaging devices, and reduces scattered light that can interfere with the optical performance of telescopes, cameras, and binoculars, and decreases glare on eyeglasses.

  • A single layer (quarter wave) AR coating of MgF2 will typically reduce reflectivity (glass with a 1.52 index) from 4% to 1.5%
  • A multi-layer AR coating can reduce reflection from 4% to .3% in the visible
  • A “V” design can reduce reflection to .1% across a narrow band of wavelength
  • Anti-Reflective coatings can be designed to function in specific bands such as UV, IR and NIR

  • Large format (up to 35″ diameter)
  • Tight tolerance (±5nm at 50% transmission)
  • Glass or plastic substrates
  • 26 vacuum coating chambers
  • Volume production (40m sq. in. of coating capacity)
  • Short lead times
  • Chamber reservation system

Typical BBAR Visible NIR Reflectivity Curves
Typical BBAR Visible NIR Reflectivity Curves

Anti-Reflective V-Coat Curves
Anti-Reflective V-Coat Curves

Also Read: Primer on AR Coatings

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