Find the inverse enumeration of a laser system with four energy levels, Eo, E1, E, E3 when the pumping is from the ground level to the upper level. Assuming that the laser occurs between the first and second levels and that there is a very rapid transition from the upper level to the lower level.

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Find the inverse enumeration of a laser system with four energy levels, Eo, E1, E, E3 when the pumping is from the ground level to the upper level. Assuming that the laser occurs between the first and second levels and that there is a very rapid transition from the upper level to the lower level.
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