Ultra-broadband dual-comb spectroscopy across 1.0–1.9 µm

Okubo, Sho; Iwakuni, Kana; Inaba, Hajime; Hosaka, Kazumoto; Onae, Atsushi; Sasada, Hiroyuki; Hong, Feng−Lei

doi:10.7567/apex.8.082402

Cited by 151 publications

(91 citation statements)

References 23 publications

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“…4 The relative linewidth of dual-comb source is another important factor that may limit the spectral resolving capability in a dual-comb system. If the relative linewidth is to be much larger than f, the spectral resolution of the dual-comb spectroscopy system would be severely compromised [36]. Here the relative linewidth of the dual-comb lines after spectral broadening is measured using a narrow-linewidth CW laser at 1549.93 nm wavelength (NTK Photonics E15, linewidth < 0.1 kHz).…”

Section: Resultsmentioning

confidence: 99%

“…It shows the potential of free-running dual-comb fiber lasers for high-resolution, combtooth-resolved dual-comb measurements, in contrast to traditional free-running, dual-laser schemes [12]. The optical spectra obtained by averaging over 5 or 199 interferograms, respectively, in the Fourier domain after phase correction in software [36,38] are shown in Fig. 6(c).…”

Section: (B) It Shows Clearly Resolved Beatnotes As Well As a Zoom-imentioning

confidence: 99%

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Picometer-resolution dual-comb spectroscopy with a free-running fiber laser

Zhao

et al. 2016

Opt. Express

207

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Dual-comb spectroscopy utilizes two sets of comb lines with slightly different comb-tooth-spacings, and optical spectral information is acquired by measuring the radio-frequency beat notes between the sets of comb lines. It holds the promise as a real-time, high-resolution analytical spectroscopy tool for a range of applications. However, the stringent requirement on the coherence between comb lines from two separate lasers and the sophisticated control system to achieve that have confined the technology to the top metrology laboratories. By replacing control electronics with an all-optical dualcomb lasing scheme, a simplified dual-comb spectroscopy scheme is demonstrated using just one dual-wavelength, passively mode-locked fiber laser.Dual-comb pulses with a repetition-frequency difference determined by the intracavity dispersion are shown to be sufficiently stable against common-mode cavity drifts and noises. As sufficiently low relative linewidth is maintained between two sets of comb lines, capability to resolve RF beat notes between comb teeth and picometer-wide optical spectral features is demonstrated using a simple data acquisition and processing system in an all-fiber setup. Possibility to use energy-efficient, free-running fiber lasers with a small comb-toothspacing could enable the realization of low-cost dual-comb spectroscopy systems affordable to more applications.

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Section: Resultsmentioning

confidence: 99%

Section: (B) It Shows Clearly Resolved Beatnotes As Well As a Zoom-imentioning

confidence: 99%

Picometer-resolution dual-comb spectroscopy with a free-running fiber laser

Zhao

et al. 2016

Opt. Express

207

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“…Further improvements to the spectral database should reduce these discrepancies. Finally, this open-path DCS can exploit even broader spectrum combs up to 2.3 µm and down to 1.1 µm (Zolot et al, 2012;Okubo et al, 2015), which would enable measurements of similar quality for 13 CO 2 , NH 3 , N 2 O, and O 2 . These results make open-path DCS a promising new system for greenhouse gas flux measurements from distributed sources.…”

Section: Discussionmentioning

confidence: 99%

Intercomparison of open-path trace gas measurements with two dual-frequency-comb spectrometers

et al. 2017

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Abstract. We present the first quantitative intercomparison between two open-path dual-comb spectroscopy (DCS) instruments which were operated across adjacent 2 km openair paths over a 2-week period. We used DCS to measure the atmospheric absorption spectrum in the near infrared from 6023 to 6376 cm −1 (1568 to 1660 nm), corresponding to a 355 cm −1 bandwidth, at 0.0067 cm −1 sample spacing. The measured absorption spectra agree with each other to within 5 × 10 −4 in absorbance without any external calibration of either instrument. The absorption spectra are fit to retrieve path-integrated concentrations for carbon dioxide (CO 2 ), methane (CH 4 ), water (H 2 O), and deuterated water (HDO). The retrieved dry mole fractions agree to 0.14 % (0.57 ppm) for CO 2 , 0.35 % (7 ppb) for CH 4 , and 0.40 % (36 ppm) for H 2 O at ∼ 30 s integration time over the 2-week measurement campaign, which included 24 • C outdoor temperature variations and periods of strong atmospheric turbulence. This agreement is at least an order of magnitude better than conventional active-source open-path instrument intercomparisons and is particularly relevant to future regional flux measurements as it allows accurate comparisons of open-path DCS data across locations and time. We additionally compare the open-path DCS retrievals to a World Meteorological Organization (WMO)-calibrated cavity ring-down point sensor located along the path with good agreement. Shortterm and long-term differences between the open-path DCS and point sensor are attributed, respectively, to spatial sampling discrepancies and to inaccuracies in the current spectral database used to fit the DCS data. Finally, the 2-week measurement campaign yields diurnal cycles of CO 2 and CH 4 that are consistent with the presence of local sources of CO 2 and absence of local sources of CH 4 .

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“…Frequency combs in particular might be well suited to providing additional high-resolution data beyond those available from FTS because of the inherent combination of high resolution and absolute frequency accuracy. In particular, systems that resolve individual comb modes can have a spectral accuracy at the kHz level (3 × 10 −8 cm −1 ) with no instrument line shape contribution [103–105]. …”

Section: Applicationsmentioning

confidence: 99%

Gas-phase broadband spectroscopy using active sources: progress, status, and applications [Invited]

et al. 2016

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Broadband spectroscopy is an invaluable tool for measuring multiple gas-phase species simultaneously. In this work we review basic techniques, implementations, and current applications for broadband spectroscopy. We discuss components of broad-band spectroscopy including light sources, absorption cells, and detection methods and then discuss specific combinations of these components in commonly-used techniques. We finish this review by discussing potential future advances in techniques and applications of broad-band spectroscopy.

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Ultra-broadband dual-comb spectroscopy across 1.0–1.9 µm

Cited by 151 publications

References 23 publications

Picometer-resolution dual-comb spectroscopy with a free-running fiber laser

Picometer-resolution dual-comb spectroscopy with a free-running fiber laser

Intercomparison of open-path trace gas measurements with two dual-frequency-comb spectrometers

Gas-phase broadband spectroscopy using active sources: progress, status, and applications [Invited]

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