What is the principle of laser hair removal?

Science you might know.

Laser hair removal is based on selective optothermal dynamics principle, listing steps below.

S1, Reasonable adjustment laser wavelength, energy, pulse width

S2, Laser can through the skin surface to the root of the hair follicle

S3, Light energy is absorbed and translated into damage hair follicle tissue heat energy

S4, Hair loses regeneration ability

S5, No damage to the surrounding tissue, with slight pain. 

For further, Laser hair removal uses laser "selective optothermal effect", with adjustment to a particular wavelength of laser through the epidermis, directly illuminate the hair follicle. 

The hair follicle and hair shaft melanin selectively absorb the light.

The resulting thermal effect makes the hair follicle necrosis, and no longer makes hair grow. 

Due to the irreversible hair follicle endothermic necrosis process , therefore, laser hair removal can achieve permanent hair removal effect.

article source:
laserhairremovalnycglobe.blogspot.com