How Laser Hair Removal works?
The primary principle behind Laser Hair Removal is selective photothermolysis (SPTL), the matching of a
specific wavelength of light and pulse duration to obtain optimal effect on a targeted tissue with minimal
effect on surrounding tissue. Lasers can cause localized damage by selectively
heating dark target matter, melanin, in the
area that causes hair growth, the follicle, while
not heating the rest of the skin. Light is absorbed by dark objects, so laser energy can be absorbed by
dark material in the skin, but with much more speed and intensity. This dark target matter, or chromophore, can be
naturally-occurring or artificially introduced.
Melanin is
considered the primary chromophore for all hair
removal lasers currently on the market. Melanin occurs naturally in the
skin, and gives skin and hair their color. There are two types of melanin in
hair. Eumelanin gives
hair brown or black color, while pheomelanin
gives hair blonde or red color. Because of the selective absorption of photons of laser light, only black or brown
hair can be removed. Laser works best with dark coarse hair. Light skin and
dark hair are an ideal combination, being most effective and producing the best
results, but new lasers are now able to target dark black hair with some
success in patients with dark skin.

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