Experimental study of optical-thermal effect of skin irradiated by multi-pulse laser

Temperature distributions of the porcine skin in the radial direction and axial direction were measured by using multi-pulse Nd:YAG laser irradiation under different wavelengths. The results show that the temperature distribution in the skin tissue is significantly affected by the measuring position, pulse repetitive frequency and wavelength, and irradiation energy density. When the wavelength and repetitive frequency are definite, the temperature of the tissue increases with the energy density, and the photo disruption threshold is 1118.19 mJ/cm² at the wavelength of 1064 nm and the repetitive frequency of 10 Hz; when the wavelength and the energy density are definite, the temperature of the tissue increases with the repetitive frequency; and when the energy density and repetitive frequency are define, the optical-thermal effect at the wavelength of 1064 nm is more remarkable than that of 532 nm.