Open AccessDual electro-optic frequency comb spectroscopy using pseudo-random modulation
Author(s) -
Khaoula Fdil,
Vincent Michaud-Belleau,
Nicolas Bourbeau Hébert,
Philippe Guay,
Adam J. Fleisher,
Jean-Daniel Deschênes,
Jérôme Genest
Publication year - 2019
Publication title -
optics letters/optics index
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.524
H-Index - 272
eISSN - 1071-2763
pISSN - 0146-9592
DOI - 10.1364/ol.44.004415
Subject(s) - optics , spectroscopy , coherence (philosophical gambling strategy) , frequency comb , modulation (music) , phase modulation , laser , materials science , coherence length , bandwidth (computing) , molecular spectroscopy , physics , computer science , telecommunications , phase noise , quantum mechanics , acoustics , superconductivity
An approach for dual-comb spectroscopy using electro-optic (EO) phase modulation is reported. Maximum-length pseudo-random binary sequences allow for energy-efficient and flexible comb generation. Self-correction of interferograms is shown to remove relative comb drifts and improve mutual coherence, even for EO combs derived from the same laser source. Methane spectroscopy is reported over a ∼10 GHz spectral range, limited by the modulators' bandwidth. The potential of a simple EO comb instrument is demonstrated to rapidly quantify atmospheric methane emissions with ppb precision over 1 km.