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Fiber laser has become a hot research in laser physics in recent years. It is considered as a new generation product which can replace the solid laser. Fiber laser is refers to with rare-earth element doped glass fiber as the gain medium of laser, fiber laser can be in the fiber amplifier based on developed under the action of the pump, fiber easily formed high power density, laser laser energy "particle number inversion" caused by, when appropriate to add a positive feedback loop (a resonant cavity can form a laser oscillation output. Optical fiber laser marking machine is the use of laser beam in a variety of different material surface to play a permanent marker. Marking effect is through the evaporation of surface material exposed deep material, or by light energy to lead to physical changes in the surface of the material and the "engraved" out of the trace, or by burning some of the material, showing the required etching patterns, text, bar code and other graphics.