Abstract

A two-mirror Fabry–Perot interferometer is described haivng a dependence of transmission T˜(ω) on frequency that is very different from the dependence T˜(l) on the distance l between the mirrors. This feature is due to resonant dielectric mirrors in which the reflection phase and amplitude depend sharply on ω. The function T˜(ω) can have several extrema ∂ T˜/∂ω = 0. At these points the interferometer becomes insensitive to a frequency change, whereas the dependence on l remains. Interferometer parameters are defined and some examples are considered. The dispersion-free interferometer can be used for measuring very small mechanical displacements with a light source with poor frequency stability. The applications to gravitational wave detectors and sensitive seismometers can be suggested if the small distance between the mirrors is acceptable.

© 1995 Optical Society of America

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