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Issue 33, 2019
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Fast molecular fingerprinting with a coherent, rapidly tunable dual-comb spectrometer near 3 μm

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Abstract

Molecular spectroscopy in the mid-infrared spectral range is expected to present fingerprints of chemical species that provide a unique identification with adequate sensitivity. Dual-comb spectroscopy, a promising successor to conventional Fourier-transform spectroscopy, enables rapid molecular fingerprinting with high-resolution and high-precision. Here, we report gas-phase transmittance and dispersion spectra by employing a rapidly tunable dual-comb spectrometer based on electro-optic frequency combs near 3 μm. The tunable spectral range >550 cm−1 and adjustable optical resolutions from a few hundred MHz to a few GHz were demonstrated. With the capabilities of wavelength agility and easily adjustable comb-mode spacing, the spectra of nitrous oxide and its isotopes were measured with Doppler-limited resolution. Furthermore, the N2-broadened spectra of acetylene were recorded to derive the collisional broadening coefficient. Fast acquisitions with adequate spectral resolution were also achieved within sub-microseconds. Both precision spectral metrology and fast molecular sampling could be implemented by employing the high-flexible dual-comb spectrometer.

Graphical abstract: Fast molecular fingerprinting with a coherent, rapidly tunable dual-comb spectrometer near 3 μm

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Publication details

The article was received on 31 May 2019, accepted on 06 Aug 2019 and first published on 06 Aug 2019


Article type: Paper
DOI: 10.1039/C9CP03090E
Phys. Chem. Chem. Phys., 2019,21, 18400-18405

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    Fast molecular fingerprinting with a coherent, rapidly tunable dual-comb spectrometer near 3 μm

    P. Luo, E. Horng and Y. Guan, Phys. Chem. Chem. Phys., 2019, 21, 18400
    DOI: 10.1039/C9CP03090E

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