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.
part 2: Experi- mental investigation and tests results.Precision Engineering40, 287–297 (2015)
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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.