We describe preliminary experimental results concerning the operation of a 3 m arm-length Michelson interferometer with two Fabry-Perot cavities whose mirrors and beam splitter are suspended independently by wires. The reflected light beams from the two Fabry-Perot cavities are recombined to obtain interference at a photo-detector; this scheme is necessary for future power-recycled laser interferometers used to detect gravitational waves. The fundamental properties of the interferometer are presented, including the power spectral density of the displacement noise.
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Kawabe, K., Nagataki, S., Ando, M. et al. Demonstration of a recombined Fabry-Perot-Michelson interferometer with suspended mirrors. Appl. Phys. B 62, 135–138 (1996). https://doi.org/10.1007/BF01081114