Laser welding is a highly precise, non-contact technique that is widely used for welding materials like gold, aluminum, and complicated mold designs due to its accuracy, minimal heat input, and ability to weld complex geometries. The technique can be used for both micro-welding (for small, intricate components) and macro-welding (for larger assemblies). Fiber lasers, Nd lasers, and sometimes CO2 lasers are commonly used for laser welding.