Frequency-agile dual-comb spectroscopy

By Guy Millot, S. Pitois, M. Yan, Tatevik Hovhannisyan, A. Bendahmane, T. Hänsch, N. Picqué. Nature Photonics, 2015

364 citations recorded by the source corpus.

Scientists propose and experimentally demonstrate a new architecture for dual-comb spectroscopy based on all-fibre tunable frequency comb sources using standard telecommunication fibre optics components, opening the way for practical dual-comb spectroscopy. Spectroscopic gas sensing and its applications to, for example, trace detection or chemical kinetics, require ever more demanding measurement times, acquisition rates, sensitivities, precisions and broad tuning ranges. Here, we propose a new approach to near-infrared molecular spectroscopy, utilizing advanced concepts of optical telecommunications and supercontinuum photonics. We generate, without mode-locked lasers, two frequency combs of slightly different repetition frequencies and moderate, but rapidly tunable, spectral span. The output of a frequency-agile continuous-wave laser is split and sent into two electro-optic intensity modulators. Flat-top low-noise frequency combs are produced by wave-breaking in a nonlinear optical fibre of normal dispersion. With a dual-comb spectrometer, we record Doppler-limited spectra spanning 60 GHz within 13 μs and an 80 kHz refresh rate, at a tuning speed of 10 nm s−1. The sensitivity for weak absorption is enhanced by a long gas-filled hollow-core fibre. New opportunities for real-time diagnostics may be opened up, even outside the laboratory.

Subfields: Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering, Spectroscopy

View Paper: https://www.semanticscholar.org/paper/91df60e150b794012b2f860981dbc94491eda56b

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In Atomic and Molecular Physics, and Optics

In Electrical and Electronic Engineering

Citations in the corpus

Broadband RF Channelizer Based on an Integrated Optical Frequency Kerr Comb Source (2018, background): “Recent advances in dual-comb spectroscopy provide new possibilities for that [23], [51]–[53].”