We have demonstrated a compact, optical-fiber-fed, optical displacement sensor utilizing a Littrow-mounted diffraction grating to form a low-finesse Fabry–Perot cavity. Length changes of the cavity are read out via the Pound–Drever–Hall rf modulation technique at . The sensor has a nominal working distance of and a total dynamic range of . The displacement noise floor was less than above , limited by the frequency drift of the reference laser. A frequency-stabilized laser would reduce the noise floor to below . The use of a modulation frequency demonstrates high-precision readout of a low-finesse compact resonant cavity.
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