Principle The 808 nm semiconductor laser hair removal system uses its unique long pulse width laser to penetrate the epidermis to the hair follicle. According to the selective light absorption principle, the energy of the laser is preferentially absorbed by the melanin in the hair, and the hair loses its ability to regenerate. During the treatment, the unique sapphire dynamic cooling technology of the system makes the epidermis anesthetized in a short time, so as to ensure that the epidermis will not be burned, and achieve painless, fast and permanent hair removal. Picosecond uses the most cutting-edge technology to treat pigmented diseases. Through fast and powerful energy, the pigment in the skin is more finely crushed, and then the principle of removing tattoos and stains through the principle of lymphatic drainage. Therefore, the treatment process is shortened from the original 10 times to 2 to 3 times, and the dermis is not damaged, reducing the possibility of side effects and increasing the success rate of the operation.