The coupling of an external cavity to a laser induces effects that are generally modeled by a plane wave treatment, even though laser optics is rather based on beams having a finite lateral extent. We demonstrate that a Fabry-Perot interferometer acts like an apertured mirror in the sense that its reflectivity can be higher for the TEM_(00) mode than for the TEM_(01) mode. We consider the single-frequency and multi-frequency cases.
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