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An Entity of Type : prov:Entity, within Data Space : webisadb.webdatacommons.org associated with source dataset(s)

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  • An optical device comprising a portion formed of a glass which contains at least one of SiO2 and GeO2 said portion including a region in which the refractive index has been spacially modulated to provide a pattern of refractive index variation, characterised in that said pattern is applied to a glass which contains B2 O3 and said pattern is not dependent on the boron content of the glass.
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