Structure Of Fiber Laser

The generation of laser signals requires three basic conditions: population inversion, optical feedback, and reaching the laser threshold. Therefore, the laser is composed of three parts: the working substance, the pump source, and the resonant cavity. The basic structure of a fiber laser is as follows. The gain fiber is the gain medium that generates photons; the pumping light is used as external energy to make the gain medium achieve population inversion, that is, the pump source; the optical resonator is composed of two mirrors, The function is to make the photon get feedback and be amplified in the working medium. The pumping light enters the gain fiber and is absorbed, which inverts the number of energy level particles in the gain medium. When the gain in the resonator is higher than the loss, laser oscillation will be formed between the two mirrors to generate a laser signal output.