Ian R. Coddington, Nathan R. Newbury, William C. Swann
Dual-comb spectroscopy is an emerging new spectroscopic tool that exploits the frequency resolution, frequency accuracy, broad bandwidth, and brightness of frequency combs for ultra-high resolution, sensitive broadband spectroscopy. By use of two coherent frequency combs, dual-comb spectroscopy allows a samples spectral response to be read out on a comb tooth-by-tooth basis rapidly and without the size constraints of a conventional spectrometer. This review describes dual-comb spectroscopy and summarizes the current state-of-the-art. As frequency comb technology progresses, dual-comb spectroscopy will continue to mature and could surpasses conventional broadband spectroscopy for a wide range of laboratory and non-laboratory applications.