Explain the concept of "fused silica" and its applications in high-temperature environments and precision optics.

Fused silica, also known as fused quartz, is a high-purity form of silica glass produced by melting pure silica sand at extremely high temperatures and then rapidly cooling it to form an amorphous solid. Fused silica exhibits exceptional thermal stability, low thermal expansion, and high optical transparency across a wide range of wavelengths, making it ideal for applications in high-temperature environments and precision optics. It is used in industries such as semiconductor manufacturing, aerospace engineering, and laser technology, where its unique combination of properties is critical for performance and reliability.