Laser crystals are solid materials that can amplify light through a process called stimulated emission. They are typically made from specific chemical compounds, such as yttrium aluminum garnet (YAG) or neodymium-doped crystals, which allow them to emit laser light when energized. These crystals are essential components in various laser systems, including those used in medical, industrial, and scientific applications. The efficiency and quality of a laser depend significantly on the properties of the laser crystal used. Factors such as the crystal's composition, size, and purity influence the wavelength and power of the emitted light. By carefully selecting and engineering these crystals, scientists and engineers can create lasers tailored for specific tasks, enhancing their performance in fields like telecommunications and material processing.