Each hair root contains protein, which is essential for the growth of the hair. Due to the heat generated during the treatment, this protein denatures and the hair will automatically fall out after a certain time. New hair does not grow back due to the lack of nutrients. This basic principle is used by many laser methods.
The diode laser, with its wavelength of 808 nm, is perfectly tuned for optimal energy transfer to the melanin of the hair while at the same time gentle on the skin. Melanin is an endogenous dye that converts the light into heat. In a diode laser treatment, the handpiece is guided over the bodies to be treated. Meanwhile, the diode laser emits controlled light pulses. This is due to the collimated light unlike the IPL method. The light penetrates into the hair root and is then absorbed by the melanin.
The absorption of light increases the temperature in the hair follicle and leads to the denaturation of the proteins that are responsible for the growth. Without these particular proteins, the hair root will no longer get the needed nutrients and will therefore fail after a while. For this reason, no new hair grows after a successful treatment.
Thanks to the constant wavelength of 808 nm, the heat penetrates only into the skin layer, which is also occupied by hair papillae. There is no impairment of other skin layers. Surrounding tissue as well as blood remains just as unaffected, as the blood pigment (hemoglobin) reacts to a different wavelength.
This treatment only has an effect when the hair is in its growth phase, that is an active connection of the respective hair to the hair root, so that the light can reach the hair root. To achieve the desired result of a hair-free skin, several sessions are needed to treat every single hair.