title: Self-corrected chip-based dual-comb spectrometer.
abstract: We present a dual-comb spectrometer based on two passively mode-locked waveguide lasers integrated in a single Er-doped ZBLAN chip. This original design yields two free-running frequency combs having a high level of mutual stability. We developed in parallel a self-correction algorithm that compensates residual relative fluctuations and yields mode-resolved spectra without the help of any reference laser or control system. Fluctuations are extracted directly from the interferograms using the concept of ambiguity function, which leads to a significant simplification of the instrument that will greatly ease its widespread adoption and commercial deployment. Comparison with a correction algorithm relying on a single-frequency laser indicates discrepancies of only 50 attoseconds on optical timings. The capacities of this instrument are finally demonstrated with the acquisition of a high-resolution molecular spectrum covering 20 nm. This new chip-based multi-laser platform is ideal for the development of high-repetition-rate, compact and fieldable comb spectrometers in the near- and mid-infrared.
authors.forename: Nicolas Bourbeau
authors.initials: NB
authors.lastname: Hébert
authors.forename: Jérôme
authors.initials: J
authors.lastname: Genest
authors.forename: Jean-Daniel
authors.initials: JD
authors.lastname: Deschênes
authors.forename: Hugo
authors.initials: H
authors.lastname: Bergeron
authors.forename: George Y
authors.initials: GY
authors.lastname: Chen
authors.forename: Champak
authors.initials: C
authors.lastname: Khurmi
authors.forename: David G
authors.initials: DG
authors.lastname: Lancaster