Isotope ratio dual-comb spectrometer

We demonstrate the use of dual-comb spectroscopy for isotope ratio measurements. show that analysis spectral range a free-running near-infrared spectrometer can be extended to midinfrared by difference frequency generation target specific regions suitable such measurements and especially relative isotopic δC13. The performed present very good repeatability over several days with standard deviation below 2‰ recording time few tens seconds, results are compatible obtained using an mass spectrometer. Our setup also shows possibility chemical species without any major modification, which used measure other ratios. Further improvements could decrease uncertainties measurements, thus compete spectrometers currently available on market.Received 4 March 2022Revised 30 2022Accepted April 2022DOI:https://doi.org/10.1103/PhysRevResearch.4.023098Published American Physical Society under terms Creative Commons Attribution 4.0 International license. distribution this work must maintain attribution author(s) published article's title, journal citation, DOI.Published SocietyPhysics Subject Headings (PhySH)Research AreasFrequency combs & self-phase lockingLaser spectroscopyLasersOptics lasersTechniquesOptical absorption spectroscopySpectroscopyAtomic, Molecular Optical