Question

In a certain four-level laser (Sec. 4.9), the final state of the laser
transition is 0.03 eV above the ground state. What fraction of the
atoms are in this state at 300 K in the absence of external excitation? What is the minimum fraction of the atoms that must be
excited in order for laser amplification to occur at this temperature? Why? How is the situation changed at 100 K? Would you
expect cooling a three-level laser to have the same effect?

Answer 1

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