A centimeter-scale dynamic optical cavity with heterodyne readout achieves sub-femtometer per square root Hertz displacement sensitivity above 8 Hz and tracks motions over ten orders of magnitude in range.
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DFMI resolves absolute ranging ambiguity by estimating modulation depth m and phase φ; Fisher analysis and simulations identify valleys of robustness that suppress systematic errors from hardware imperfections.
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Demonstration of a compact optical resonator-based displacement sensing technique with sub-femtometer precision
A centimeter-scale dynamic optical cavity with heterodyne readout achieves sub-femtometer per square root Hertz displacement sensitivity above 8 Hz and tracks motions over ten orders of magnitude in range.
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Fundamental Limitations of Absolute Ranging via Deep Frequency Modulation Interferometry
DFMI resolves absolute ranging ambiguity by estimating modulation depth m and phase φ; Fisher analysis and simulations identify valleys of robustness that suppress systematic errors from hardware imperfections.