Precision Glass & Optics (also known as PG&O and Buk Optics) is a company that provides precision glass, optics, and thin film optical coatings. Its products include windows, mirrors, beam splitters, prisms, and assembled optics from square, rectangular, and circular parts to complex shapes and precision optical prisms. The company serves aerospace, imaging, biophotonics, medical, automotive, solar, and other markets.