Fused silica is a type of glass made from pure silicon dioxide (SiO2) that is produced by melting high-purity quartz sand. It is known for its excellent optical clarity, low thermal expansion, and high resistance to thermal shock, making it ideal for various applications, including lenses, prisms, and laboratory equipment. Due to its unique properties, fused silica is widely used in industries such as telecommunications, semiconductor manufacturing, and optics. Its ability to transmit ultraviolet (UV) light also makes it valuable in applications like UV lithography and fiber optics, where precision and durability are essential.