Gd0.63Y2.37Sc2Ga3O12 is abbreviated as GYSGG. It is a garnet single crystal doped with scandium and yttrium, grown by the Czochralski method. It is a very good magneto-optical crystal. By using its magneto-optical properties, the interaction and conversion of light, electricity and magnetism can be realized, and magneto-optical devices with optical modulation, optical isolation, optical switch, optical deflection, optical information processing, optical display, optical recording, optical storage, optical replication, optical frequency polarization and other optical and electromagnetic conversion functions can be constructed.