Application of picoseconds
Before the advent of picosecond lasers, the “hands-on” for depigmentation in the field of laser beauty was the Q-switched laser. The duration of each laser shot was nanoseconds (1 nanosecond = 1000 picoseconds). Nanoseconds, which may sound small, are still a bit too long for the goals of precise freckle removal and tissue protection. Excessive laser action time will cause some heat energy to be dissipated to other surrounding tissues during the heating process of the pigment particles. While burning the pigment, it is also easy to burn the normal tissues next to it.












