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AR Coating of GRIN Lenses

Dec 2012
Laser Components GmbHRequest Info
OLCHING, Germany, Sept. 10, 2012 — The complex coating of temperature-sensitive optics at process temperatures below 100 °C, previously challenging, is now promising – despite the long coating times required for such complex structures.

Most coatings are applied in high vacuum at temperatures well above 100 °C, which has a negative impact on some materials, leading to discoloration or malfunction.

Laser Components GmbH has succeeded in applying a broadband antireflection (AR) coating on such critical optics using ion beam sputtering.

After coating, gradient-index (GRIN) optics achieved an average reflection of <1.5% in the range from 400 to 1000 nm, enabling a large wavelength bandwidth and large differences in the angle of incidence to be compensated. 


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antireflection coating
A thin layer of material applied to a lens surface to reduce the amount of reflected energy. Ideally the index of refraction of that material should be equal to the square root of the product of the indices of the material on either side of the coating, while the ideal thickness for a single-layer coating is one-quarter of the wavelength at which reflectance is to be minimized. See also multilayer coating.
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