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

Oguzhan Kara, Luke Maidment, Tom Gardiner, Peter G. Schunemann, Derryck T. Reid

Research output: Contribution to journalArticlepeer-review

63 Citations (Scopus)
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The new material orientation patterned gallium phosphide (OPGaP) enables coherent and broadband infrared spectroscopy in the spectral fingerprint region from 6 to 12um, accessing the largest molecular absorption cross-sections and permitting sensitive, quantitative and species-specific measurements. Here, we show how dual-comb spectroscopy-a form of high-speed Fourier-transform spectroscopy involving no moving parts and capable of very high resolutions-can be extended to the 6-8um wavelength band using femtosecond optical parametric oscillators (OPOs). By acquiring dual-comb interferograms in a time comparable with the mutual decoherence time of the OPO combs we implement cross-correlation-based spectral averaging to obtain high-fidelity spectra of H2O and CH4 at approximately 0.3 cm-1 resolutions from 1285 to 1370 cm-01 and 1500-1585 cm-1.
Original languageEnglish
Pages (from-to)32713-32721
Number of pages9
JournalOptics Express
Issue number26
Early online date15 Dec 2017
Publication statusPublished - 25 Dec 2017


  • Spectrometers and spectroscopic instrumentation
  • Parametric oscillators and amplifiers
  • Spectroscopy, Fourier transforms
  • Spectroscopy, molecular


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