The melanin in the stem absorbs the IPL’s bright radiation producing heat. The adjacent cells, responsible of the hair’s genesis and growth, are permanently damaged through thermal management. The required heat must be correctly administered, in order to selectively damage the bulb and not harm the skin
Commonly abbreviated as IPL, is a technology used by cosmetic and medical practitioners to perform various skin treatments for aesthetic and therapeutic uses including hair removal, photorejuvenation, and treatment of dermatologic diseases. The technology utilizes a broad spectrum lightsource, with a general spectral range of 500 to 1200 nm. Various cutoff filters are commonly used to filter out lower frequencies and narrow this spectrum to target specific structures and chromophores. Because of the broad spectrum of the IPL light source they are unique, as opposed to lasers, in the ability to filter the light spectrum to target various chromophores in the skin.
How does light remove hair?
Meeting between the light and pigment, melanin, found in high concentration in hair created a high temperature rise casuing damage to the root and bulb. It stops hair growth.