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I found that Professor Junghwuen An's Fabry Perot interferometers with a 3rd reflecting surface is not required to emulate a Michelson interferometer's ability to measure the change in position of the self-coherence function first minima. Zero and negative delay is only important when one want to scan the separation between the two primary mirrors and ...


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Well while it has similarities with the OPE, it is more than that. In fact, it satisfies the OPE limit when $z\to w_j$ for any $j$, since the OPE you are talking about tells you only the singular terms, while there are also infinitely many non-singular terms, i.e., schematically $$ T(z)\phi(w,\bar w)=\frac{h_\phi}{(z-w)^2}\phi(w,\bar w)+\frac{1}{z-w}\...



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