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  • $\begingroup$ In laymans terms, a Fabry Perot cavity's mirrors are slightly "leaky". They have to be, otherwise you can't get plane wave light in and out. I'm pretty sure a hand-waving $\Delta E \Delta t \ \rightarrow \ \Delta \omega \Delta t$ relationship can be found where $\Delta t$ is the round-trip time multiplied by the effective number of bounces. But don't quote me on that :-) $\endgroup$
    – uhoh
    Commented Nov 30, 2023 at 14:33
  • $\begingroup$ I've linked back here in How close to reality is my handwaving argument about Fabry Perot interferometers? $\endgroup$
    – uhoh
    Commented Nov 30, 2023 at 22:27