Laser: (1) (noun) A device that generates an intense, narrow beam of light created by bombarding an active medium (e.g., CO2, Nd:YAG, argon), with energy in the form of high-voltage electricity, high-intensity light, or radio frequency waves. By passing through a mirrored tube, the photons are released as a nondivergent ("collimated"), monochromatic (all one wavelength), coherent (all in phase) beam. Lasers are used in microsurgery, for cauterization, excision, and for a variety of diagnostic purposes. The wavelength delivered depends on the active medium excited; targetted tissues ("chromophores") are determined by the laser wavelength that they absorb. Laser dosage, or fluence, delivered is derived by dividing the energy delivered by the cross-sectional area of the beam (Joules/CM2). Lasers can be based on numerous chemical sources, gas, liquid, and solid, some of which are listed in the chart on p. 1051. Lasers are widely used in printers of text or x-ray images. (2) (verb) To treat a structure with a laser beam.chromophore. [acronym coined from light amplification by stimulated emission of radiation]
Source: Stedman's Medical Spellchecker, © 2006 Lippincott Williams & Wilkins. All rights reserved.
Laser: A device that concentrates light into an intense, narrow beam used to cut or destroy tissue. It is used in microsurgery, photodynamic therapy, and for a variety of diagnostic purposes.
Source: National Institute of Health
Laser: acronym stands for Light Amplification by Stimulated Emission of Radiation; this phenomenon is brought about using devices that transform light of varying frequencies into a single intense, nearly nondivergent beam of monochromatic radiation; lasers operate in the visible, infrared, or ultraviolet regions of the spectrum and are capable of producing immense heat and power when focused at close range; used in surgical procedures, in diagnosis, and in physiologic studies; lasers used at low power, transmitting light not heat, have been used in wound healing and pain control.
Source: CRISP
Laser: An optical source that emits photons in a coherent beam. Light Amplification by Stimulated Emission of Radiation (LASER) is brought about using devices that transform light of varying frequencies into a single intense, nearly nondivergent beam of monochromatic radiation. Lasers operate in the visible, infrared, or ultraviolet regions of the spectrum. They are capable of producing immense heat and power when focused at close range and are used in surgical procedures, in diagnosis, and in physiologic studies. Lasers used at low power, transmitting light not heat, have been used in wound healing and pain control (LASER THERAPY, LOW-LEVEL).
Source: MeSH 2007
Source - MeSH 2007
Source - MeSH 2007
Source - MeSH 2007
Source - CRISP
The following list attempts to classify Laser into categories where each line is subset of the next.
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