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[Active Glasses] Active glass for integrated optic applications [1] 
IOG-1 and IOG-10 were developed specifically for compatibility with known sodium ion-exchange technologies for the fabrication of active guided wave structures. These glasses have particularly found applications with rare earth ions such as erbium, ytterbium, praseodymium, and their combinations.
Active & Passive Laser Glasses: SCHOTT Advanced Optics | SCHOTT North America
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