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The Diffraction Grating Replication Process

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The Diffraction Grating Replication Process

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The process for making replica gratings results in a grating whose grooves are formed in a very thin layer of resin that adheres strongly to the surface of the substrate material. The optical surface of a reflection replica is usually coated with aluminum (Al), but gold (Au) or silver (Ag) is recommended for greater diffracted energy in certain spectral regions. Transmission gratings have no reflective coating.Most commercially-available surface-relief gratings are made using a casting process, which faithfully reproduces the three-dimension nature of the grating surface. It is for this reason that photographic replication techniques are not generally sufficient.

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