A solid-state laser is a type of laser that uses a solid-state material as the active medium for amplification of light. The solid-state material is typically a crystalline or glass material that is doped with ions of rare-earth metals such as neodymium, ytterbium, or erbium. When the material is excited with an external energy source, such as a flash lamp or a laser diode, the rare-earth ions emit coherent light that is amplified as it travels through the material. Solid-state lasers are used in a wide range of applications, including materials processing, medical devices, laser spectroscopy, and scientific research. They are known for their high output power, high efficiency, and excellent beam quality, which make them suitable for precision applications.