Abstract
Experiments with an interferometer for cm‐waves show that the normal oscillation modes of open resonators are modified in a characteristic manner, if a small phase‐object or a corresponding mirror step is inserted. We found a close analogy between oscillation modes in such an interferometer and longitudinal‐section waves in waveguide tubes partially filled up with dielectric substances. This analogy permits quantitative statements which are well confirmed by experiment.For interferograms with displaced interference fringes — well known from conventional interferometry — it is shown that they must be considered to arise actually from superposition of the fields of several simultaneously excited low‐order modes. Thus it was possible to obtain information about the basic effects in the region of the resolution limit for multiple‐beam interferometry.
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