Utilizing the explosive effect of the ND: YAG LASER, the laser permeate the By epidermis into the dermis and takes effect on pigment mass and is absorbed pigment Since the laser pulses is extremely short in nanosecond and comes with super high energy, the pigment mass would swell quickly and break into small pieces,which will be eliminated through metabolism. Thus the tattoo or other pigmentation will be removed without injury to normal tissue. The treatment is safe and convenient without downtime or side effects.