Fiber laser is a device that uses rare-earth-doped fiber as the gain medium to generate laser output. Fiber lasers can be developed on the basis of fiber amplifiers. Because the fiber cores of fiber lasers are very thin, under the action of pump light, the internal power density of the fiber is high, which makes the laser energy level appear "population inversion" phenomenon. On this basis, a resonant cavity is formed into a positive feedback loop to form a laser oscillation at the output. The structure of fiber lasers is similar to traditional solid-state laser and gas laser, mainly composed of three parts: pump source, gain fiber, and reson ant cavity. Among them, the pump source is generally a high-power semiconductor laser, which is used as external energy to make the gain medium achieve population inversion. The gain fiber is a glass fiber doped with rare earth elements, which is a gain medium used to generate photons. The resonant cavity is generally composed of two m...
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