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Imagine that there is a laser system with
three levels of energy and low pumping. Assuming
that the laser action takes place between the first
and the second level. The inverse number of this system is
Rp
Rp
A + A3.
31
P.
N,-N, =
32
A-Bp(v)
Option 2
Rp
A – A
+ Rp
32
N, – N, =-
A- Bp(v)
21
21

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