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For the...Photonics.com 7/2/2018Photonics Buyers' Guide CategoriesOptical MaterialsOptical materials are materials that, by virtue of their optical characteristics, are used in optical elements.Infrared MaterialsLaser Diode Packaging MaterialsMicroscopy Immersion LiquidsCompaniesOhara CorporationOHARA manufactures more than 130 environmentally safe optical glass types, free of both lead and arsenic. 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