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 in color. Light can be characterized both by its frequency, or number of wave crests passing a given point per second, and by its wavelength. Different wavelengths of light are seen as different colors. Like radio waves, light can also carry information. The information in the beam varies in the frequency or shape of the light wave. Because light waves are of much higher fre....

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