Isotope ratio dual-comb spectrometer

  title={Isotope ratio dual-comb spectrometer},
  author={Alexandre Parriaux and Kamal Hammani and Christophe Thomazo and Olivier Musset and Guy Millot},
  journal={Physical Review Research},
We demonstrate the use of dual-comb spectroscopy for isotope ratio measurements. We show that the analysis spectral range of a free-running near-infrared dual-comb spectrometer can be extended to the mid-infrared by difference frequency generation to target specific spectral regions suitable for such measurements, and especially the relative isotopic ratio δC. The measurements performed present a very good repeatability over several days with a standard deviation below 2h for a recording time… 

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