mirror substrate materials

Mirror substrate materials are the base materials used to make the primary reflective surface of telescopes and optical devices. These materials must be stable, durable, and able to hold a precise shape to ensure clear imaging. Common substrates include materials like glass, glass-ceramics, and special ceramics such as Zerodur or fused silica. These materials resist temperature changes and mechanical stress, minimizing distortions that could blur images. The choice depends on the specific needs, such as weight, thermal stability, and manufacturing processes, to optimize the performance of high-precision optical systems.