Lasers 2

The laser is a device that produces a beam of light. The beam is produced by a process known as stimulated emission, and the word “laser” is an acronym for the phrase “light amplification by stimulated emission of radiation.” Lasers amplify light and produce coherent light beams. A light beam is coherent when its waves or photons are in step with one another. Laser light can be made extremely intense, highly directional, and very pure …

…the red aiming beam of a laser in vaporizing the decayed area of a tooth. The endless uses of lasers in all kinds of medicine is unimaginable. Military Laser guidance systems for missiles, aircraft, and satellites are being studied and constructed. Lasers are also used by soldiers, laser guns are used to determine distance to a target accurately. In 1983 President Ronald Reagan urged the use of laser beams in the defense system against hostile missiles.