On December 27, Gelonghui reported that TDG Holding (600330.SH) stated on the investor interaction platform that lithium niobate crystals are crystals that integrate piezoelectric, electro-optical, photo-refractive, and laser-active effects, and with advantages such as high-temperature resistance and corrosion resistance, they are also known as the "optical silicon" material of the optoelectronic era, widely used in high-performance filters, electro-optical devices, holographic storage, and Quantum Communication, among other applications. The company has now mastered key core technologies for the preparation of 6-inch and 8-inch lithium niobate crystals. The company is currently developing 12-inch lithium niobate crystals.