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Laser is an acronym for light amplification by stimulated emission of radiation In the last century many types of lasers have been used for many different applications from welding to surgery to military and even many uses in every day life by harnessing the principles of light and stimulated emissionTo understand how lasers work we must first understand the physics behind light waves Light is emitted from a source and travels in straight lines and when it strikes an object is either absorbed reflected or refracted Light behaves primarily like a wave and its this wave nature of light that allows lasers to work Constructive interference is what amplifies light Since light is a wave it has a frequency calculated by the equation where f is the frequency c is the speed of light which is equal to 300 x 108 ms and is the wave length of light Also waves have crests the high points of waves and troughs the low points Constructive interference occurs when two waves of the same frequency meet at a crest or trough therefore combining to form a wave that has an amplitude equal to the sum of the individual amplitudes of the original waves Stimulated emission is the process that the laser works on which was first proposed by Albert Einstein in 1917 When a sufficient number of atoms either gas solid or liquid absorb energy so that they are in an excited state of higher energy stimulated emission can occur Light of a specific wavelength can produce more light with the same phase and direction these light waves will be coherent Stimulated emission amplifies the coherency of this radiation and gives the radiation a very narrow beam spreadThe combination of light amplification and stimulated emission creates a laser Laser light is coherent because the atoms are stimulated to emit waves of light that are in phase creating constructive interference producing a powerful and intense laser light
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