How is laser light used in tattoo and hair removal?

Laser tattoo removal and laser hair removal is a low-level laser therapy (LLLT). Cosmetic and medical laser treatments use semiconductor light source called a light-emitting diode (LED). These LEDs emit high brightness visible (390-750nm), ultraviolet (below 375mm), and infrared (above 760 to 2500nm) electromagnetic  radiation. LEDs function by combining eletrons with the device holes to release photons in the form of energy or wavelengths for different purposes.

Ultraviolet light sources are used for dermabrasion, such as the YAG laser, to prepare the skin before removing tattoos. Lasers also used in tattoo removal include the Q-switched Ruby, the Q-switched Yag, and the Q-switched Alexandrite and are designed to respond to different tattoo ink colours. When used to remove tattoos, the laser  light is aimed at the tattoo colour and disintegrates the ink that is absorbed into the body.  Ruby lasers, Alexandrite lasers, Nd:YAG lasers, and Diode lasers are used in laser hair removal where concentrated light is aimed at the hair follicle to deaden it for removal. Certain laser suit specific skin and hair types.

Under normal conditions of use according to laser safety regulations, lasers are safe for use in infertility treatment, in laser tattoo removal and also laser hair removal. LEDs do not contain mercury like fluorescent light sources, can focus light, last longer, produce more light and can use light of an intended color or focus, such as for cosmetic or medical use.

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