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treatment theory,980nm laser is the optimum absorptionspectrum of porphyrin vascular cells. vascularcells absorb the high-energy laser of 980nm wavelength,solidification occurs, and finally dissipated.to overcome the traditional laser treatment rednesslarge area of burning the skin professional design hand-piece,enabling the 980nm laser beam is focused onto a 0.2-0.5mmdiameter range, in order to enable more focused energyto reach the target tissue, while avoiding burn the surroundingskin tissue.syi