q swithced nd yag laser working principle:the energy of q-switched nd:yag laser can be absorbed by the blue and black melanin. the melanin will be fragmented so small that they can be metabolized by the lymphatic system or egested out of the body. thus the tattoo or other pigmentations will be removed without damage to normal tissue.the treatment is safe and convenient without downtime and side effects. laser emitted by the system has a strong penetration ability which allows it to reach the deep layer of dermis. the pigment particles absorb the light energy and explode sharply, burst into the tiny pieces, thus diminish the color density and get rid of it..syi