| http://www.w3.org/ns/prov#value | - The inner part 583 can comprise, consist of, or consist essentially of a host glass, such as, for example, a silica glass, and phosphorus (P), and the outer part 585 can comprise, consist of, or consist essentially of a host glass, such as, for example, a silica glass, and P and another material, such as for, example, germanium (Ge).
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