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Overcoating of Reflection Gratings

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Overcoating of Reflection Gratings

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The metallic coating on a reflection grating is evaporated onto the substrate. This produces a surface whose reflectivity is higher than that of the same metal electroplated onto the grating surface. The thickness of the metallic layer is chosen to enhance the diffraction efficiency throughout the spectral region of interest.Most standard reflection gratings are furnished with an aluminum (Al) reflecting surface. While no other metal has more general application, there are several special situations where alternative surfaces or coatings are recommended. Gratings coated with gold (Au) and silver (Ag) have been used for some time for higher reflectivity in certain spectral regions, as have more exotic materials such as iridium (Ir), osmium (Os) and platinum (Pt).

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