Fiber lasers are a type of laser where the gain medium is an optical fiber doped with rare-earth elements such as erbium, ytterbium, or neodymium. The unique properties of fiber lasers, including high efficiency, excellent beam quality, and compact size, have made them increasingly popular in industrial, medical, defense, and telecommunications applications. Fiber lasers operate by pumping the doped fiber with a laser diode, which excites the rare-earth ions and causes them to emit light at a specific wavelength. This light is then amplified as it bounces back and forth inside the fiber, resulting in a highly concentrated and powerful laser beam. Research in the field of fiber lasers focuses on developing new materials, optimizing the design of fiber laser systems, improving their power output and efficiency, and exploring new applications for this technology. Ongoing research efforts also aim to overcome limitations such as beam quality degradation, thermal effects, and nonlinear phenomena in fiber lasers to further enhance their performance and versatility.