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Laser cutting machinery9/15/2023 ![]() You may think what if some electrons were already at a higher energy level well, those electrons already at a higher level, absorb the additional energy and they radiate two photons of light during their return back to the stable condition. The Spontaneous Emission is triggered by the stimulation provided by the additional light energy. This radiation of photons by the electrons in the excited state is termed Spontaneous Emission and this happens rapidly (the radiation of photons happens within a microsecond after the atom (electrons) absorb additional energy). ![]() You may be aware that the electrons of the atom in an ‘ excited’ state do not have a stable condition and they tend to move back to ground level and during this moving back they emit or radiate the additional absorbed energy in the form of photons of light. More electrons at the ground level can be pushed to ‘ metastable state’ if you provide or pump additional energy in the form of light when the number of electrons at the metastable state exceeds that at ground level ‘ population inversion’ happens. In the lasing materials (used in the laser system) a ‘ metastable state’ (between the ground level and the upper energy level) is possible where the electrons in the excited state can stay for few microseconds. If you provide additional energy to the atoms by an external source (like light), electrons in the atom absorb the energy and move to an upper energy level from their lower energy (ground) level and such electrons in the upper energy level are termed as the electrons in the ‘ excited’ or ‘ agitated’ state. You also know that electrons move in the orbits surrounding the protons and neutrons (called nucleus). You all know that the matter surrounding us, whether it is the oxygen in the air or the carbon dioxide or the gold, all are made up of tiny atoms and each atom consists of protons, neutrons, and electrons.
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