Fiber lasers use rare-earth-doped fiber as the gain medium, and the pump light forms a high power density in the fiber core, causing the "population inversion" of the doped ion energy level. When a positive feedback loop (forming a resonant cavity) is properly added, It produces laser output. The application range of fiber laser is very wide, including fiber communication, laser space remote inquiry, shipbuilding, automobile manufacturing, laser engraving machine, laser marking machine, laser cutting machine, printing roller, metal and non-metal drilling/cutting/welding (Brass welding, quenching, cladding and deep welding), military and national defense security, medical equipment and equipment, large-scale infrastructure, etc. Fiber lasers, like other lasers, are composed of a working medium that can generate photons, an optical resonator that allows photons to be fed back and resonantly amplified in the working medium, and a pump source that excites light transitions, but the working medium of the fiber laser It is a doped fiber that also plays a role of guiding waves. Therefore, the fiber laser is a waveguide type resonant device. Fiber lasers generally use optical pumping methods. The pump light is coupled into the fiber, and the photons at the pump wavelength are absorbed by the medium to form a population inversion. Finally, stimulated radiation is generated in the fiber medium to output the laser. Therefore, the fiber laser It is essentially a wavelength converter. The resonant cavity of a fiber laser is generally composed of two sides and a pair of plane mirrors, and the signal is transmitted in the cavity in the form of a waveguide.
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