The term Laser is an acronym for light amplification by the stimulated emission of radiation, which serves to explain most but not all the critical physical interactions that occur within a laser generating cavity. It is pragmatic to have a general knowledge of stimulated emission so that one can evaluate newer laser technologies and understand how lasers affect biologic tissues. This library dissertation provides the reader with a modicum of fundamental information about lasers, their basic physics, and photobiologic effects; free-beam versus contact types; safety precautions; and terminology.
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