Laser marking technology is one of the largest application areas of laser processing. Laser marking is a method that uses a high-energy-density laser to locally irradiate a workpiece to vaporize the surface material or change the color of the chemical reaction, leaving a permanent mark. Laser marking can produce a variety of words, symbols and patterns, and the character size can be on the order of millimeters to micrometers, which has special significance for product anti-counterfeiting.