http://www.asds.net/Patients/FactSheets/patients-Fact_Sheet-lasers.html
American Society For Dermatologic Surgery
Laser stands for Light Amplification by the Stimulated Emission of Radiation. Lasers work by producing an intense beam of bright light that travels in one direction. The laser beam can cut, seal or vaporize skin tissue and blood vessels. The laser has the unique ability to produce one specific color (wavelength) of light that can be varied in its intensity and pulse duration.