A Simulation Study of the Treatment Effects for the 1064 nm Nd:YAG Laser under Various Fluence and Pulse Durations

Abstract

The purpose of this study was to analyze treatment effect for skin aging accordin g to changes of fluence and pulse duration of 1064nm Nd:YAG laser. For this purpose, we designed skin model composed of epidermis, dermis, and fat, and each layer had similar thickness of facial skin. Environmental temperature was set to 26 degrees C, and the initial temperature of each skin layer was designated as human body temperature (36.5 degrees C). The fluence of the treatment laser was divided into 8, 9 and 10J/cm(2), and the pulse duration was classified to 0.35, 0.50, 0.70 and 1.00ms, respectively. Based on experimental results, we found that the skin temperature increased along with penetration depth as increase in fluence. In addition, the treatment condition with fluence of 8J/cm(2) and pulse duration of 0.7ms, as well as fiuence of 9J/cm(2) and pulse duration of 0.5ms, transmitted the heat into the dermis most effectively without any skin damage.