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An acronym that stands for Light Amplification by Stimulated Emission of Radiation. Lasers emit monochromatic light (a single color or wavelength), coherent (in phase), and collimated.

A measure of instantaneous power output from the laser; typically measured in Watts.

Length between two identical points on subsequent electromagnetic waves. The wavelength of a laser determines it’s color and absorption properties.

Power per unit area; measured at a treatment surface.

Laser Classification
Lasers are divided into safety classifications in the US by the American National Standard Identification (ANSI), and globally by the International Electrotechnical Commission (IEC). The classifications below from the revised system (2002) apply to non-magnified laser devices.