Question: for a 4-level laser system, assuming the same pumping rate Rp and relaxation rates ij as in the text, but taking into account the existence

for a 4-level laser system, assuming the same pumping rate Rp and relaxation rates ij as in the text, but taking into account the existence of degeneracies g1 and g2 of the lower and upper energy levels and their effect on the definitions of W12, W21, and N21.

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