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Fiber-coupled, Littrow-grating cavity displacement sensor

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Abstract

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 925MHz. The sensor has a nominal working distance of 2cm and a total dynamic range of 160nm. The displacement noise floor was less than 3×1010mHz above 102Hz, limited by the frequency drift of the reference laser. A frequency-stabilized laser would reduce the noise floor to below 1012mHz. The use of a 925MHz modulation frequency demonstrates high-precision readout of a low-finesse compact resonant cavity.

© 2010 Optical Society of America

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