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Compact Multifringe Interferometry with Subpicometer Precision
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DOI：10.1103/PhysRevApplied.12.034025.png)
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Abstract
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Deep-frequency-modulation interferometry combines optical minimalism with multifringe readout. However, precision is key for applications such as optical gradiometers for satellite geodesy or as dimensional sensors for ground-based gravity experiments. We present a single-component interferometer smaller than a cubic inch. Two of these are compared to each other to demonstrate tilt and displacement measurements with a precision of less than 20 nrad/root Hz and 1 pm/root Hz at frequencies below 1 Hz.
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