Description Inrad Optics (formerly Photonic Products Group) manufactures products for use in photonics, including custom optics, crystals, and components, and provides thin-film coating services on a contract basis. Its products find applications in laser systems, military gear, semiconductor production equipment, and telecommunications networks. The company's INRAD unit grows and finishes crystals used in commercial laser systems. Its custom optics segment includes waveplates, beam displacers, rotators, and phase-shift plates. Inrad Optics gets about 10% of its sales from overseas customers.