In recent years, fiber laser has become a hot topic in laser physics research. It is considered that it is possible to completely replace the new generation of solid laser. Fiber laser is a laser which uses the rare earth element glass fiber as the gain medium. The fiber laser can be developed on the basis of the fiber amplifier. The high power density is easily formed in the optical fiber under the action of the pump light, which causes the laser energy level of the laser working material to be reversed by the number of particles, when the positive feedback loop is properly added. The resonator can form a laser oscillating output. Fiber laser marking machine uses laser beams to mark permanent marks on different material surfaces. The effect of marking is to reveal the deep material through the evaporation of the surface material, or to “engrave” from the chemical physical changes of the surface material through the light energy, or to burn out some of the material through the light energy, and show the patterns, characters, bar code and the like of the required etching.
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