Stimulated Emission

137 - Stimulate Emission

In this video Paul Andersen explains how stimulated emission can be used to create coherent light. When an atom absorbs a photon it moves to a higher energy level through stimulated absorption. It may then release a photon and moves to a lower energy level through spontaneous emission. However a stimulated atom at a high energy level may release to identical photons that travel coherently. An example of stimulated emission can be found in a laser.

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Music Attribution
Title: String Theory
Artist: Herman Jolly
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“Laser.” Wikipedia, the Free Encyclopedia, May 16, 2015. http://en.wikipedia.org/w/index.php?t....
“Lasers.” PhET. Accessed May 17, 2015. https://phet.colorado.edu/en/simulati....
V1adis1av. Stimulated Emission, May 3, 2008. Own work. http://commons.wikimedia.org/wiki/Fil....
V1adis1av, Stimulated_Emission svg: Alberoderivative work: English: Stimulated Emission, January 18, 2015. This file was derived from: Stimulated Emission.svg. http://commons.wikimedia.org/wiki/Fil....