Two-mode interference measurement for nanometer accuracy absolute ranging.

@article{Phung2013TwomodeIM,
  title={Two-mode interference measurement for nanometer accuracy absolute ranging.},
  author={D H Phung and Christophe Alexandre and Michel Lintz},
  journal={Optics letters},
  year={2013},
  volume={38 3},
  pages={
          281-3
        }
}
We demonstrate a laser ranging scheme that uses a high-frequency modulated beam to achieve subnanometer precision by the combined use of interferometric and time-of-flight measurements. We first describe how the absolute distance is extracted from a two-mode interference signal. In particular, we show that the signal, which presents both optical and synthetic wavelength scales, allows one to achieve nanometer-scale accuracy, despite the significant long-term phase drifts in the 20 GHz detection… 

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