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  • Title: Unobtrusive interferometer tracking by path length oscillation for multidimensional spectroscopy.
    Author: Lee KF, Bonvalet A, Nuernberger P, Joffre M.
    Journal: Opt Express; 2009 Jul 20; 17(15):12379-84. PubMed ID: 19654639.
    Abstract:
    We track the path difference between interferometer arms with few-nanometer accuracy without adding optics to the beam path. We measure the interference of a helium-neon beam that copropagates through the interferometer with midinfrared pulses used for multidimensional spectroscopy. This can indicate motion, but not direction. By oscillating the path length of one arm with a mirror on a piezoelectric stack and monitoring the oscillations of the recombined helium-neon beam, the direction can be calculated, and the path delay can be continuously tracked.
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