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The displacement- and frequency-noise-free interferometer (DFI) is a multiplelaser interferometer array for gravitational wave detection free from both thedisplacement noise of optics and laser frequency noise. So far, partialexperimental demonstrations of DFI have been done in 2-D table top experiments.In this paper, we report the complete demonstration of a 3-D DFI. The DFIconsists of four Mach-Zehnder interferometers with four mirrors and twobeamsplitters. The displacement noises both of mirrors and beamsplitters weresuppressed by up to 40 dB. The non-vanishing DFI response to a gravitationalwave was successfully confirmed using multiple electro-optic modulators andcomputing methods.

Development of displacement- and frequency-noise-free interferometer in 3-D configuration for gravitational wave detection