fiber laserIt refers to a laser that uses rare earth element doped glass fiber as a gain medium.

　　fiber laserBy utilizing stimulated radiation, a highly focused and highly coherent laser beam is generated inside the optical fiber. The pump light first passes through the coupling system and enters the gain fiber doped with rare earth ions; Then, the rare earth ions in the doped fiber core absorb the energy of the pumped photons and undergo energy level transitions. When the "particle number inversion" is achieved, high-energy particles will undergo relaxation and transition back to the ground state in the form of radiation from the excited state, while releasing energy in the form of photons; Finally, when certain conditions for cavity mirror feedback and mode selection are met, stable energy oscillations will be formed and output in the form of laser through the reflecting mirror.

Features:

Good beam quality: The waveguide structure of the fiber makes it easy to obtain single transverse mode output, less affected by external factors, and can achieve high brightness laser output.

High efficiency: By selecting a semiconductor laser that matches the absorption characteristics of doped rare earth elements as the pump source, high light to light conversion efficiency can be achieved, and the overall electro-optical efficiency of commercial fiber lasers can reach up to 25%.

Good heat dissipation characteristics: Using slender doped rare earth element optical fibers as gain media, the surface area and volume ratio are large, about 1000 times that of solid block lasers. Low and medium power do not require special cooling, while high power uses water-cooled heat dissipation to avoid beam quality and efficiency degradation caused by thermal effects.

Compact structure and high reliability: using small and flexible optical fibers as gain media, the pump source is a small and modular semiconductor laser, combined with fiber optic devices, it can achieve full fiberization, high immunity to environmental disturbances, strong stability, low maintenance time and cost.