Nature is full of electromagnetic wave, to distinguish the electromagnetic unit is the wavelength. Extract a particular wavelength of the electromagnetic wave, can form a laser. Laser for medical hairdressing mainly depends on its energy and penetrating. Specific surface damage can absorb certain wavelengths of laser, through its energy loss damage disease. Different damage depth need different wavelength of laser to reach. The longer the wavelength of laser, the stronger the penetration of the skin, the more deep penetrate skin; And damage to the color of the deeper, can absorb the longer wavelength of laser.
