What is laser?

  • (noun): An acronym for light amplification by stimulated emission of radiation; an optical device that produces an intense monochromatic beam of coherent light.
    Synonyms: optical maser


A laser is a device that emits light (electromagnetic radiation) through a process of optical amplification based on the stimulated emission of photons. The term "laser" originated as an acronym for Light Amplification by Stimulated Emission of Radiation. The emitted laser light is notable for its high degree of spatial and temporal coherence.

Read more about Laser.

Some articles on laser:

Iridectomy - Comparison With Nd:YAG Laser Iridotomy
... iridectomy has been superseded by NdYAG laser iridotomy, because the laser procedure is much safer ... NdYAG laser iridotomy avoids such a catastrophe by laser created hole in the iris, which facilitates flow of aqueous humor from the posterior to the anterior chamber of the eye ...
Optical Levitation
... Typically photon radiation pressure of a vertical upwardly directed and focused laser beam of enough intensity counters the downward force of ... The laser radiation can be fixed in wavelength such as that of an argon ion laser or that of a tunable dye laser ... Laser power required is of the order of 1 Watt focused to a spot size of several tens of micrometers ...
Pave Penny
... The Lockheed Martin AN/AAS-35(V) Pave Penny is a laser spot tracker carried by US Air Force attack aircraft and fighter-bombers to enable them to track a laser ... Pave Penny was developed in the mid-1970s based on the earlier AN/AVQ-11 Pave Sword laser tracker used on a few USAF F-4 Phantom II during the Vietnam War ... weighs only 32 lb (14.5 kg) is a simple laser spot tracker that searches for reflected laser light from other laser designators (used by friendly air or ground forces) and displays that ...
Particle Image Velocimetry - History
... Laser Doppler Velocimetry predates PIV as a laser-digital analysis system to become widespread for research and industrial use ... PIV itself found its roots in Laser speckle velocimetry, a technique that several groups began experimenting with in the late 1970s ...
Laser - Fictional Predictions
... See also Raygun Several novelists described devices similar to lasers, prior to the discovery of stimulated emission A very early example is the Heat-Ray featured in H ... A laser-like device was described in Alexey Tolstoy's science fiction novel The Hyperboloid of Engineer Garin in 1927 ... exaggerated the biological effect (laser bio stimulation) of intense red light in his science fiction novel Fatal Eggs (1925), without any reasonable ...