The functioning of a laser goes back to Albert Einstein's theory of stimulated emission of radiation. It also includes other theories that help explain local tissue damage. As the light beam hits the skin, the skin may either reflect the light away, scatter the light, absorb the light, or let the light pass right through the different layers of the skin.
Certain parts of the skin called chromophores absorb the light. When these chromophores absorb the light, physical, mechanical, chemical, or temperature changes may occur in the tissue.
There are many different types of lasers. They include the carbon dioxide laser, the YAG (neodymium, or yttrium aluminum garnet) laser, and the argon laser. Each one works differently and may be used for different treatment options. Laser light can be delivered either continuously or intermittently. The wavelength of the laser determines the target within the skin and the effect it may have.