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DataRay Inc. - ISO 11146-Compliant Laser Beam Profilers
Photonics Dictionary

dielectric coating

A high-reflectance coating consisting of alternating layers of quarter-wave film of a higher refractive index and lower refractive index than the substrate. Such coatings can be made very specific to a reflected wavelength or, by varying the layers' thicknesses or film indexes, spread over a wide wavelength interval.
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