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Abstract: Optical frequency-comb-based-high-resolution spectrometers offer enormouspotential for spectroscopic applications. Although various implementations havebeen demonstrated, the lack of suitable mid-infrared comb sources has impededexplorations of molecular fingerprinting. Here we present for the first time afrequency-comb Fourier transform spectrometer operating in the2100-to-3700-cm-1 spectral region that allows fast and simultaneousacquisitions of broadband absorption spectra with up to 0.0056 cm-1 resolution.We demonstrate part-per-billion detection limits in 30 seconds of integrationtime for various important molecules including methane, ethane, isoprene, andnitrous oxide. Our system enables precise concentration measurements even ingas mixtures that exhibit continuous absorption bands, and it allows detectionof molecules at levels below the noise floor via simultaneous analysis ofmultiple spectral features. This system represents a near real-time,high-resolution, high-bandwidth mid-infrared spectrometer which is ready toreplace traditional Fourier transform spectrometers for many applications intrace gas detection, atmospheric science, and medical diagnostics.



Autor: Florian Adler, Piotr Masłowski, Aleksandra Foltynowicz, Kevin C. Cossel, Travis C. Briles, Ingmar Hartl, Jun Ye

Fuente: https://arxiv.org/







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