Dual-comb spectroscopy in the spectral fingerprint region using OPGaP optical parametric oscillators

Dual-comb spectroscopy using OPGaP optical parametric oscillators is demonstrated with cross-correlation-based spectral averaging to obtain high-fidelity spectra of H 2 O and CH 4 at approximately 0.3 cm −1 resolutions from 1285-1370 cm −1 and 1500-1585 cm −1 .