The process of laser hair removal involves exposure to controlled pulses of laser energy directed at the hair follicles. The principle of laser hair removal is selective photothermolysis (SPTL), wherein the hair follicle is selectively heated until it is damaged.
Melanin, the chromophore that decides the intensity of hair color, is present in the hair follicle. Light is readily absorbed by dark-colored substances like melanin. By matching the laser’s wavelength and pulse duration to the melanin, only the targeted follicles are affected without damaging the surrounding area.
With repeated exposure and follicle disruption, hair density in the treated region is significantly reduced. Hair goes through growth phases, and when hair is in the correct phase, it is able to be targeted for removal.