Compact multi-fringe interferometry with sub-picometer precision
Abstract
Deep frequency modulation interferometry combines optical minimalism with multi-fringe readout. Precision however is key for applications such as optical gradiometers for satellite geodesy or as dimensional sensor 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/Hz and 1\,pm/Hz at frequencies below 1\,Hz.
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