| http://www.w3.org/ns/prov#value | - Depending on this wavelength range, the substrate may be made of a wide variety of materials, including glass for the visible (VIS) range, quartz for the ultraviolet (UV) and VIS ranges, sapphire for the vacuum UV range of approximately 1700-2000??? certain plastics such as acrylics and polycarbonates for the VIS range, and certain inorganic crystals such as magnesium fluoride for use in the far U
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