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...