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In almost every book on photonics I've seen, the following expression for the steady state gain is derived

1 + flux/flux_{saturation}= g_{small signal}/g,

where I byfluxmean intracavity flux andgis the gain. When talking about lasers, then in the very same books (e.g. Saleh/Teich) the authors argue that when lasing begins, the intracavity photon flux increases, hence by the above expression the gain decreases until it settles on its steady state value (which is equal to losses). What I find to be confusing is that the above expressiononlyholds for steady state, but Saleh/Teich (and others) use it to argue that gain decreasesuntilit reaches steady state.

How can they use our steady state expression above to describe the dynamical behavior too?

Best,

Niles.

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# Laser Physics: Steady state gain

Can you offer guidance or do you also need help?

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