Femtometer displacement resolution with phase-insensitive Doppler sensing.

@article{Little2019FemtometerDR,
  title={Femtometer displacement resolution with phase-insensitive Doppler sensing.},
  author={Bethany J Little and Juli{\'a}n Mart{\'i}nez-Rinc{\'o}n and Umberto Bortolozzo and S. Residori and John C. Howell},
  journal={Optics letters},
  year={2019},
  volume={44 2},
  pages={
          355-358
        }
}
The measurement of extremely small displacements is of utmost importance for fundamental studies and practical applications. One way to estimate a small displacement is to measure the Doppler shift generated in light reflected off a moving object, converting a displacement measurement into a frequency measurement. Here we show a sensitive device capable of measuring μHz/Hz Doppler frequency shifts corresponding to tens of femtometer displacements for a mirror oscillating at 2 Hz. While the… CONTINUE READING

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