Working principle

According to the principle of selective photopyrolysis, when shorted the action time of the laser, the laser energy diffuses less to the surrounding tissue. If the energy is limited to the target that needs treatment, the surrounding normal tissue can be protected, so the selectivity of treatment become stronger.The picosecond laser pulse width is only 1% of the traditional Q-switched laser. Under this ultra-short pulse width, the light energy is too late to be converted into heat energy, and there is almost no photothermal effect.When the laser energy is absorbed by the target, its volume will expand rapidly, and then be blasted and torn into pieces. "The picosecond laser is more powerful and complete in crushing pigment particles and less damaging the surrounding tissue." From the perspective of treatment, the effective rate can reach more than 94% (Ota nevus almost 100%).