Glossary of Laser Terms-E

Glossary of Laser Terms-E

Embedded Laser        

A laser with an assigned class number higher than the inherent capability of the laser system in which it is incorporated, where the system's lower classification is appropriate to the engineering features limiting accessible emission.

Emission  

Act of giving off radiant energy by an atom or molecule.

 Enclosed Laser Device  

Any laser or laser system located within an enclosure which does not permit hazardous optical radiation emission from the enclosure. The laser inside is termed an "embedded laser."

  Energy (Q)  

The capacity for doing work. Energy is commonly used to express the output from pulsed lasers and it is generally measured in Joules (J). The product of power (watts) and duration (seconds). One watt second = one Joule.

   Erythema  

The medical term for redness of the skin due to congestion of the capillaries.

   Excimer  

An abbreviation for excited dimer. A gas mixture used as the active medium in a family of lasers emitting ultraviolet light.

 Exposure Duration  

The total amount of time the ocular structures or skin are exposed to the laser beam.