Beginning of Essay
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 ampli ....

Middle of Essay
.... the same instant but instead in random short bursts. Such beams are called incoherent. The process for laser action, was first proposed by Albert Einstein in 1917. The working principles of lasers were outlined by the American physicists Arthur Leonard Schawlow and Charles Hard Townes in their 1958 patent application. The patent was granted but was later challenged by the American physicist and engineer Gordon Gould. In 1960 the American physicist Theodore Maiman observed the first laser action in solid ruby. HOW A LASER WORKS A laser is made up of several basic components. One is called active medium, which consists of atoms of a gas, molecules ....