The number of energy levels required to get a practical laser will bea.4b.2c.3
Question
The number of energy levels required to get a practical laser will bea.4b.2c.3
Solution
The number of energy levels required to get a practical laser is 4. This is because a practical laser requires a population inversion, which is achieved through a four-level laser system. The four levels are the pump level, upper laser level, lower laser level, and ground level. The pump level is where the atoms are excited by an external energy source. The upper laser level is where the atoms decay to after being excited. The lower laser level is where the atoms decay to from the upper laser level, emitting a photon in the process. The ground level is where the atoms return to after emitting a photon.
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