High Coherence Mid-Infrared Dual Comb Spectroscopy Spanning 2.6 to 5.2 microns
Abstract
Mid-infrared dual-comb spectroscopy has the potential to supplant conventional high-resolution Fourier transform spectroscopy in applications that require high resolution, accuracy, signal-to-noise ratio, and speed. Until now, dual-comb spectroscopy in the mid-infrared has been limited to narrow optical bandwidths or to low signal-to-noise ratios. Using a combination of digital signal processing and broadband frequency conversion in waveguides, we demonstrate a mid-infrared dual-comb spectrometer that can measure comb-tooth resolved spectra across an octave of bandwidth in the mid-infrared from 2.6-5.2 m with sub-MHz frequency precision and accuracy and with a spectral signal-to-noise ratio as high as 6500. As a demonstration, we measure the highly structured, broadband cross-section of propane (C3H8) in the 2860-3020 cm-1 region, the complex phase/amplitude spectrum of carbonyl sulfide (COS) in the 2000 to 2100 cm-1 region, and the complex spectra of methane, acetylene, and ethane in the 2860-3400 cm-1 region.
Keywords
Cite
@article{arxiv.1709.07105,
title = {High Coherence Mid-Infrared Dual Comb Spectroscopy Spanning 2.6 to 5.2 microns},
author = {Gabriel Ycas and Fabrizio R. Giorgetta and Esther Baumann and Ian Coddington and Daniel Herman and Scott A. Diddams and Nathan R. Newbury},
journal= {arXiv preprint arXiv:1709.07105},
year = {2018}
}