YSGG, also known as Yttrium Scandium Gallium Garnet, is a single crystal substrate used in various applications such as optoelectronics, photonics, and microwave devices. It has a high refractive index and thermal conductivity, which makes it a suitable substrate for high-power laser applications. YSGG also has good dielectric and mechanical properties, making it suitable for use in high-frequency filters, resonators, and phase shifters. The high thermal stability of YSGG makes it an attractive option for high-temperature applications. The YSGG crystal is grown using the Czochralski method and is available in various sizes and shapes for various applications.