Polymethyl methacrylate (PMMA) is a transparent thermoplastic material with 92% light transmission and amorphous structure. It has exceptional optical properties in the visible, UV, and IR regions of the spectrum. PMMA is one of the hardest and most scratch-resistant thermoplastic polymers. This material can be used in various modifications in a wide range of applications in lighting, advertising, and construction. PMMA can be polymerized in the pores of silica sol-gel to build a solid-state dye laser. PMMA is also used to make polymer optical fibers utilized in data communication in local area networks; optical interconnects between electronic components, illuminated displays, optical amplifiers, and lasers in the visible region; as well as ﬁber-optic components, such as splitters, ﬁlters, optical switches, and sensors.