Development of ultrafast time-resolved dual-comb spectroscopy

Asahara, Akifumi; Minoshima, Kaoru

doi:10.1063/1.4976730

Cited by 66 publications

(24 citation statements)

References 15 publications

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“…Time-resolved direct comb spectroscopy with a single frequency comb has been performed using highly dispersive spectrometers to resolve individual comb teeth (e.g. detection of transient free radicals in chemical reactions 29 ), but more recent work has begun to exploit the rapid scanning capability of dual-comb systems for time-resolved measurements 30 , 31 . Time-resolved DCS applied to transient events such as laser plasmas combines the broadband capability of LIBS with the high spectral resolution of tunable LAS.…”

Section: Resultsmentioning

confidence: 99%

Dual-comb spectroscopy of laser-induced plasmas

Bergevin

Yeak

et al. 2018

Nat Commun

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Dual-comb spectroscopy has become a powerful spectroscopic technique in applications that rely on its broad spectral coverage combined with high frequency resolution capabilities. Experiments to date have primarily focused on detection and analysis of multiple gas species under semi-static conditions, with applications ranging from environmental monitoring of greenhouse gases to high-resolution molecular spectroscopy. Here, we utilize dual-comb spectroscopy to demonstrate broadband, high-resolution, and time-resolved measurements in a laser-induced plasma. As a demonstration, we simultaneously detect trace amounts of Rb and K in solid samples with a single laser ablation shot, with transitions separated by over 6 THz (13 nm) and spectral resolution sufficient to resolve isotopic and ground state hyperfine splittings of the Rb D2 line. This new spectroscopic approach offers the broad spectral coverage found in the powerful techniques of laser-induced breakdown spectroscopy (LIBS) while providing the high-resolution and accuracy of cw laser-based spectroscopies.

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Section: Resultsmentioning

confidence: 99%

Dual-comb spectroscopy of laser-induced plasmas

Bergevin

Yeak

et al. 2018

Nat Commun

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“…DCS introduces a second local oscillator (LO) comb with slightly different repetition frequency difference to replace the dispersion device in VIPA or mechanical scanning components in FTS. Due to the unique capability of obtaining high resolution, high sensitivity, broad spectral range, and fast measurement speed simultaneously, DCS has drawn considerable attention since its first implementation [ 12 ] and brought significant improvement for applications such as molecular absorption spectroscopy [ 13 ], coherent anti-Stokes Raman spectroscopy [ 14 ], multidimensional spectroscopy [ 15 ], time-resolved spectroscopy [ 16 ], ellipsometry [ 17 ], strain sensors [ 18 ], hyperspectral imaging [ 19 ], and ranging [ 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Improving Resolution of Dual-Comb Gas Detection Using Periodic Spectrum Alignment Method

Zhou

et al. 2021

Sensors

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Dual-comb spectroscopy has been an infusive spectroscopic tool for gas detection due to its high resolution, high sensitivity, and fast acquisition speed over a broad spectral range without any mechanical scanning components. However, the complexity and cost of high-performance dual-comb spectroscopy are still high for field-deployed applications. To solve this problem, we propose a simple frequency domain post-processing method by extracting the accurate position of a specific absorption line frame by frame. After aligning real-time spectra and averaging for one second, the absorbance spectrum of H13C14N gas in the near-infrared is obtained over 1.1 THz spectral range. By using this method, the standard deviation of residual error is only ~0.002, showing great agreement with the conventional correction method. In addition, the spectral resolution is improved from 13.4 GHz to 4.3 GHz compared to direct spectrum averaging. Our method does not require a specially designed common-mode suppression comb, rigorous frequency control system, or complicated computational algorithm, providing a cost-effective scheme for field-deployed Doppler-limited spectroscopy applications.

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“…Because of its remarkable capabilities, DCS has been adopted in several applications, e.g., broadband, high-precision, high-resolution gas spectroscopy [26,27], high-speed solid-state spectroscopy [28,29], time-resolved spectroscopy [30], nonlinear spectroscopy [31,32], terahertz spectroscopy [33], optical sensing [34,35], distance measurement [36], microscopy [37], and imaging [38]. These applications require high sensitivity.…”

Section: Introductionmentioning

confidence: 99%

High-coherence ultra-broadband bidirectional dual-comb fiber laser

2019

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Dual-comb spectroscopy has emerged as an attractive spectroscopic tool for high-speed, high-resolution, and high-sensitivity broadband spectroscopy. It exhibits certain advantages when compared to the conventional Fourier-transform spectroscopy. However, the high cost of the conventional system, which is based on two mode-locked lasers and a complex servo system with a common single-frequency laser, limits the applicability of the dual-comb spectroscopy system. In this study, we overcame this problem with a bidirectional dual-comb fiber laser that generates two high-coherence ultra-broadband frequency combs with slightly different repetition rates (f rep). The two direct outputs from the single-laser cavity displayed broad spectra of > 50 nm; moreover, an excessively small difference in the repetition rate (< 1.5 Hz) was achieved with high relative stability, owing to passive common-mode noise cancellation. With this slight difference in the repetition rate, the applicable optical spectral bandwidth in dual-comb spectroscopy could attain ~479 THz (~3,888 nm). In addition, we successfully generated high-coherence ultra-broadband frequency combs via nonlinear spectral broadening and detected high signal-to-noise-ratio carrier-envelope offset frequency (f CEO) beat signals using the self-referencing technique. We also demonstrated the high relative stability between the two f CEO beat signals and tunability. To our knowledge, this is the first demonstration of f CEO detection and frequency measurement using a self-referencing technique for a dual-comb fiber laser. The developed high-coherence ultra-broadband dual-comb fiber laser with capability of f CEO detection is likely to be a highly effective tool in practical, high-sensitivity, ultra-broadband applications.

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Development of ultrafast time-resolved dual-comb spectroscopy

Cited by 66 publications

References 15 publications

Dual-comb spectroscopy of laser-induced plasmas

Dual-comb spectroscopy of laser-induced plasmas

Improving Resolution of Dual-Comb Gas Detection Using Periodic Spectrum Alignment Method

High-coherence ultra-broadband bidirectional dual-comb fiber laser

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