TY - JOUR
T1 - Frequency-agile dual-comb spectroscopy
AU - Millot, Guy
AU - Pitois, Stéphane
AU - Yan, Ming
AU - Hovhannisyan, Tatevik
AU - Bendahmane, Abdelkrim
AU - Hänsch, Theodor W.
AU - Picqué, Nathalie
N1 - Publisher Copyright:
© 2015 Macmillan Publishers Limited. All rights reserved.
PY - 2016/1/1
Y1 - 2016/1/1
N2 - 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 1/4s 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.
AB - 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 1/4s 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.
UR - https://www.scopus.com/pages/publications/84951909262
U2 - 10.1038/nphoton.2015.250
DO - 10.1038/nphoton.2015.250
M3 - 文章
AN - SCOPUS:84951909262
SN - 1749-4885
VL - 10
SP - 27
EP - 30
JO - Nature Photonics
JF - Nature Photonics
IS - 1
ER -