A fiber laser consists of three parts: a gain medium that can generate photons, an optical resonant cavity that allows photons to receive feedback and undergo resonant amplification in the gain medium, and a pump source that excites optical transitions. The gain medium of high-power rare earth doped double clad fiber laser is selected as a double clad fiber doped with rare earth elements. A semiconductor laser diode array is used as the pump source, and the resonant cavity is usually selected as a fiber grating, which can narrow the linewidth and improve the beam quality. By using a fiber optic combiner, the pump light is coupled into the gain fiber. After the gain fiber absorbs the pump light, a particle number inversion is formed, and the pump light oscillates in the cavity. After reaching the threshold, a laser output is formed.
Pump diode: acts as a pump source to provide energy. You can choose single tube or Bar bar, and when selecting the system, you need to consider factors such as brightness, efficiency, cooling, and price comprehensively.
Fiber optic combiner: Fusing multiple optical fibers into a single fiber for pump coupling is a key device for achieving full fiber optics in high-power fiber lasers, with a single path capable of withstanding power intensity of over 100 watts.
Doped fiber: Many rare earth ions can be used to manufacture fiber lasers doped with rare earth ions, with operating wavelengths ranging from 0.4um to 4um, as shown in the following figure
Fiber Bragg Grating: Equivalent to a high reflection mirror, forming a laser resonant cavity and playing a role in selecting laser wavelength and output coupler.
Fiber collimator: The output end of the fiber is connected to the collimator to achieve spatial collimation output of the laser in the fiber.
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