Fiber laser marking machine can also be called metal laser marking machine. Because it uses a fiber laser, which uses rare-earth element-doped glass fiber as the gain medium, it is easy to form a high power density in the fiber under the action of the pump light, resulting in the laser energy level of the laser working material. ”, when a positive feedback loop (constituting a resonator) is properly added, the laser oscillation output can be formed. The laser wavelength is 1064nm, which belongs to infrared invisible light, and the absorption rate of metal materials for this wavelength is relatively high, so the fiber laser marking machine is mainly used for metal marking.