A fiber laser is a type of laser in which the active gain medium is an optical fiber doped with rare-earth elements. Rare-earth elements such as Erbium, Ytterbium, Neodymium, Dysprosium, Praseodymium, Thulium and Holmium are used in the industry to make fiber lasers. Fiber lasers are related to doped fiber amplifiers with an additional feature of lasing. Fiber amplifiers provide light amplification without lasing. Fiber non-linearities, such as stimulated Raman scattering or four-wave mixing can also provide gain and thus serve as gain media for a fiber laser.
Fiber lasers find their application in material processing (marking, engraving, cutting), telecommunications, spectroscopy, medicine, and directed energy weapons. The video uploaded by Nufern Corporation provides basic and short introduction into the science of light, optical fibers and the development of optical fiber lasers.