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The concept of laser can be sued as early as the beginning of this century. In 1905, Einstein first proposed the light quantum hypothesis based on the general relativity theory and started the concept of laser. In 1917, Einstein again proposed stimulated emission theory and accelerated Laser theory matures. In 1960, the American Hughes Laboratory and Maiman Maiman engineers produced the world's first ruby laser. After decades of using the laser, the application of laser has developed extremely rapidly, especially the most successful for medical use. Laser is a kind of high-energy light beam, which can release energy in a short period of time and generate heat effect on the tissue, resulting in selective destruction. The laser is not radiation or radiation and there is no doubt that the cells will cause mutation or carcinogenesis. Laser cutting, sealing and evaporation of skin tissue and blood vessels. The laser produces a single beam of strong light, its intensity and pulse time can be adjusted. The wavelength and power output of a particular laser determine its medical use. For example: Q-switched laser, through the millisecond, microsecond or even nanosecond ultra-pulse time, the laser can instantly penetrate the epidermis of the skin to reach the skin deep, so that the pigment particles within the skin instantly smash, crushed pigment particles will be the body After phagocytosis of macrophages, slowly away.