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The only way for stimulated emission to occur is if most of the atoms are in their exited state, which means the atoms have a higher amount of energy than normal. More atoms must exist in the excited state than in the ground state (opposite of exited state) for amplification to occur. When more atoms are in their excited state than in he ground state it is called “popular inversion...
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When more atoms are in their excited state than in he ground state it is called “popular inversion.†The energy source is the device that helps the laser get popular inversion by pumping energy into the active medium so that the energy excites the atoms. The two mirrors that are located in the optical cavity are reflecting the photons back and forth through the active medium...
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