Because of their structures, fiber lasers have several advantageous properties. Due to the large absorption length, surpassingly good efficiency of pumping is possible: generally the wall plug efficiency is around 30-40% (this value is usually less than 1% in gas and solid lasers).

Introduction Optical fiber lasers or fiber lasers for short belong to a group of solid-state lasers where the light is amplified in an optical fiber. The active material that provides the laser action is usually present in the fiber, the additive