Digital correction method for realizing a phase-stable dual-comb interferometer

Zhu, Zebin; Ni, Kai; Zhou, Qian; Wu, Guanhao

doi:10.1364/oe.26.016813

Cited by 36 publications

(11 citation statements)

References 38 publications

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“…In particular the negative impact of the usual oscillator noise in the ≤ 100 kHz frequency band can be elegantly reduced when a high ∆f r ≥ 200 kHz is used. Moreover, a large ∆f r /2 will also improve the efficacy of phase noise correction techniques [43][44][45][46] , which can lower noise with frequencies up to ∆f r /2.…”

Section: Resultsmentioning

confidence: 99%

1 GHz dual-comb spectrometer for fast and broadband measurements

Voumard¹,

Darvill²,

Wildi³

et al. 2021

Preprint

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Section: Resultsmentioning

confidence: 99%

1 GHz dual-comb spectrometer for fast and broadband measurements

Voumard¹,

Darvill²,

Wildi³

et al. 2021

Preprint

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“…However, our spectrometer is not capable of time-domain coherent averaging of the interferograms due to the fee running f ceo of the combs, therefore the results are limited to single-shot and low SNR FIDs. It would be interesting to use computational coherent averaging [72,73] and/or digital correction [74] methods, to extend the coherence time of the spectrometer and realize a phase-stable dual-comb spectrometer. This will enable the time-domain averaging of the FID signal of the sample and new ways of dual-comb spectroscopy for plasma diagnostics.…”

Section: Discussionmentioning

confidence: 99%

Broadband Time-Resolved Absorption and Dispersion Spectroscopy of Methane and Ethane in a Plasma Using a Mid-Infrared Dual-Comb Spectrometer

Abbas

Dijk

Jahromi

et al. 2020

Sensors

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Conventional mechanical Fourier Transform Spectrometers (FTS) can simultaneously measure absorption and dispersion spectra of gas-phase samples. However, they usually need very long measurement times to achieve time-resolved spectra with a good spectral and temporal resolution. Here, we present a mid-infrared dual-comb-based FTS in an asymmetric configuration, providing broadband absorption and dispersion spectra with a spectral resolution of 5 GHz (0.18 nm at a wavelength of 3333 nm), a temporal resolution of 20 μs, a total wavelength coverage over 300 cm−1 and a total measurement time of ~70 s. We used the dual-comb spectrometer to monitor the reaction dynamics of methane and ethane in an electrical plasma discharge. We observed ethane/methane formation as a recombination reaction of hydrocarbon radicals in the discharge in various static and dynamic conditions. The results demonstrate a new analytical approach for measuring fast molecular absorption and dispersion changes and monitoring the fast dynamics of chemical reactions over a broad wavelength range, which can be interesting for chemical kinetic research, particularly for the combustion and plasma analysis community.

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“…Already, single-interferogram acquisition provides a useful SNR of approximately 10. The high-mutual coherence of the combs would in principle permit longer acquisition durations 34 , and phase-correction 19,[40][41][42][43][44][45] can extend this well beyond 1000 s.…”

Section: Setupmentioning

confidence: 99%

Dual-Comb Real-Time Molecular Fingerprint Imaging

Voumard¹,

Wildi²,

Brasch³

et al. 2020

Preprint

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Hyperspectral imaging provides spatially resolved spectral information. Utilising dual frequency combs as active illumination sources, hyperspectral imaging with ultra-high spectral resolution can be implemented in a scan-free manner when a detector array is used for heterodyne detection. However, relying on low-noise detector arrays, this approach is currently limited to the near-infrared regime. Here, we show that dualcomb hyperspectral imaging can be performed with an uncooled near-to-mid-infrared detector by exploiting the detector array's high frame-rate and the combs' high-mutual coherence. The system simultaneously acquires hyperspectral data in 30 spectral channels across 16'384 pixel, from which molecule-specific gas concentration images can be derived. Artificial intelligence enables rapid data reduction and real-time image reconstruction. Owing to the detector array's sensitivity from 1 µm to 5 µm wavelength, this demonstration lays the foundation for versatile imaging of molecular fingerprint signatures across the infrared wavelength-regime in real-time.

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Digital correction method for realizing a phase-stable dual-comb interferometer

Cited by 36 publications

References 38 publications

1 GHz dual-comb spectrometer for fast and broadband measurements

1 GHz dual-comb spectrometer for fast and broadband measurements

Broadband Time-Resolved Absorption and Dispersion Spectroscopy of Methane and Ethane in a Plasma Using a Mid-Infrared Dual-Comb Spectrometer

Dual-Comb Real-Time Molecular Fingerprint Imaging

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