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Sent. 1 The creation of light all starts off with the input of energy into the atoms.
Sent. 2 Normally, an electron is stable, or in their ground state, when an certain amount of energy is absorbed, one or more electrons are brought out farther from the nucleus, into higher energy levels (or they get “excited”) making it unstable.
Sent. 3 An unstable atom would quickly try to stabilize itself, “when the electron falls back to its original orbit, the energy released is a packet of light known as a photon”. (Arcand, Kimberly K., and Megan Watzke K. "Introducing Light." Introduction. Light: The Visible Spectrum and beyond. Black Dog & Leventhal, 2015. New York, New York.)
Sent. 4 This process is called spontaneous emission of radiation, afterwards a process called stimulated emission will cause other electrons to release their photons form a coherent and collimated stream of light. …show more content…
1 Stimulated emission is a chain reaction that is caused when the electrons were in the “excited stage”.
Sent. 2 Normally, more electrons will be in their ground state than the ones in their “excited states”, to form a population inversion, which means “the usual state of affairs in the atoms is swapped around (inverted)” (http://www.explainthatstuff.com/lasers.html), the atoms would be pumped with energy to create a condition called the metastable state.
Sent. 3 After the electrons are in the metastable state (this is where the electrons remains excited for a short period of time), a photon released would cause other electrons to jump back down into its normal stable stage, causing it to release photons.
Sent. 4 This is repeated quickly in a chain reaction, forming a coherent beam of laser light.
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