the co2 laser,with a specific wavelength of 10.6 um can be absorbed by human body tissue(no matter what color the skin is )almost by 100%,with the laser slightly passing through the skin.it is the heat and electromagnetic effect of the laser that people use to conduct non-blood or less-blood cutting,cauterizing,gasification and accurate micorsurgery,most optical knives use co2 laser source.The treatment is a fractional treatment that produces thousands of deep, tiny columns in your skin,

 called, microscopic treatment zones. The system is in that it intensively treats old epidermal pigment cells without affecting any of the surrounding tissue, which reduces healing time (about 24 hours) and

promotes the skin'snatural process for creating new, healthier tissue to replace the damaged cells. It is a safe, noninvasive procedure that allows you to rediscover the fresh, healthy skin of your youth.