What makes the stimulated emission's spectrum narrower than spontaneous emission's?
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That diagram makes it pretty clear, IMHO. So are you really asking why the laser action threshold > 0? – PM 2Ring Jan 04 '21 at 08:33
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I cannot interpret these two diagrams and why the stimulated one is narrower. I cannot see the relation between two . – pnatk Jan 04 '21 at 17:03
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The diagrams says that laser action only happens when the intensity $I$ is above the threshold, and above that threshold, the wavelengths are within the range $\lambda_0 - \delta\lambda$ to $\lambda_0 + \delta\lambda$. – PM 2Ring Jan 04 '21 at 17:26