Time-resolved dual-comb spectroscopy with a single electro-optic modulator

Huh, Jeong Hyun; Chen, Zaijun; Vicentini, Edoardo; Hänsch, Theodor W.; Picqué, N.

doi:10.1364/ol.431451

Cited by 15 publications

(4 citation statements)

References 25 publications

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“…The DCS technique allowing fast measurements is especially well suited for monitoring of transient chemical phenomena. [7,8] Proof-of-principle demonstrations and high impact experiments have been carried out in the MIR region with DCS approach, confirming its efficiency in trace gas detection, [6] high resolution molecular spectroscopy, [9] and studies of chemical reaction kinetics. [7] The combination of a high resolution and broad spectral coverage proves very useful in atmospheric [10] and combustion monitoring.…”

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confidence: 68%

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Analysis of Gas Mixtures with Broadband Dual Frequency Comb Spectroscopy and Unsupervised Learning Neural Network

Tian,

Kolomenskii,

Schuessler

et al. 2023

Advanced Intelligent Systems

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Broadband mid‐infrared spectroscopy not only offers supreme sensitivity for the massively parallel detection of trace gases but also presents many challenges. Herein, a new platform combining the advantages of a mid‐infrared dual‐comb spectrometer based on two difference‐frequency generation combs pumped by femtosecond Er‐doped fiber comb oscillators and an unsupervised deep learning neural network consisting of information extraction and information mapping blocks is presented. The scarce data problem, the uncertainties of apparatus, and manual operations intrinsic to multicomponent gas mixture analysis are overcome by coupling an unsupervised leaning approach with a model‐agnostic, physics‐informed data augmentation strategy using simulated data from spectral databases. The system provides reliable simultaneous identification of gas species, concentration retrieval, as well as ambient pressure prediction and eliminates the negative impacts on the measurement, such as model error, baseline fluctuation, and unknown absorbers. Parallel optical detection of 31 different mixtures of 5 gas species over a 2900–3100 cm−1 spectral range with a sub part‐per‐billion sensitivity is demonstrated showing the potential in various applications such as atmospheric monitoring, diagnostics with breath biomarkers, and capturing rapid chemical reaction kinetics.

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mentioning

confidence: 68%

“…The DCS technique allowing fast measurements is especially well suited for monitoring of transient chemical phenomena. [ 7,8 ]…”

Section: Introductionmentioning

confidence: 99%

Analysis of Gas Mixtures with Broadband Dual Frequency Comb Spectroscopy and Unsupervised Learning Neural Network

Tian,

Kolomenskii,

Schuessler

et al. 2023

Advanced Intelligent Systems

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“…Specifically, when compared to on-chip microresonator comb sources based on the Kerr effect, the advantages of our EO approach include less stringent requirement on dispersion, flexibility with comb line spacing, ability to operate at low optical powers, and simultaneous operation at a number of different frequencies. Unlike with non-resonant EOcomb synthesizers 30 , our EO microrings do not allow dual-comb generation in a single generator straightforwardly. Driving the microring at two distinct RF frequencies generates a forest of sidebands, as each sideband within the microring resonances becomes modulated by each radio-frequency signal 31 .…”

Section: Discussionmentioning

confidence: 99%

Thin-film lithium-niobate electro-optic platform for spectrally tailored dual-comb spectroscopy

Shams-Ansari

Chen

et al. 2022

Commun Phys

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Laser frequency comb generators on photonic chips open up the exciting prospect of integrated dual-comb microspectrometers. Amongst all nanophotonic platforms, the technology of low-loss thin-film lithium-niobate-on-insulator shows distinguishing features, such as the possibility to combine various optoelectronic and nonlinear optical functionalities that harness second- and third-order nonlinearities, and thus promises the fabrication of a fully on-chip instrument. Here, a critical step towards such achievement is demonstrated with an electro-optic microring-based dual-comb interferometer. Spectra centered at 191.5 THz and spanning 1.6 THz (53 cm−1) at a resolution of 10 GHz (0.33 cm−1) are obtained in a single measurement without requiring frequency scanning or moving parts. The frequency agility of the system enables spectrally-tailored multiplexed sensing, which allows for interrogation of non-adjacent spectral regions, here separated by 6.6 THz (220 cm−1), without compromising the signal-to-noise ratio. Our studies show that electro-optic-based nanophotonic technology holds much promise for new strategies of molecular sensing over broad spectral bandwidths.

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“…They suggested that mode-locked lasers with a repetition rate of 1 GHz enable data acquisition much faster than that of conventional THz pump–probe spectroscopy. Over the past five years, we have developed ASOPS-based spectroscopic techniques with optical frequency combs and repetition-frequency-stabilized lasers, which have substantially enhanced the dynamic range of time delay scanning and improved the data acquisition speed. − Recently, we demonstrated that ASOPS-based two-dimensional electronic spectroscopy (2DES) with two synchronized repetition-frequency-stabilized lasers could break the technical limitations of conventional 2DES regarding the data acquisition rate and the time resolution. , However, there has been no experimental demonstration of asynchronous sampling two-color TA measurements in the mid-IR (MIR) spectral range, except for a few reports on the MIR dual-comb spectroscopy, which is a linear spectroscopic technique. − …”

Section: Introductionmentioning

confidence: 99%

Unveiling Ultrafast Carrier Dynamics of Tellurium Microcrystals by Two-Color Asynchronous Sampling Infrared Transient Absorption Spectroscopy

Jang,

Han,

Kim

et al. 2023

J. Phys. Chem. C

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Tellurium (Te) microcrystal with a bandgap of approximately 0.37 eV is a potentially useful semiconducting material exhibiting ultrafast electronic relaxation processes. To measure the intervalley and intravalley relaxation rates, we carried out two-color near-IR (NIR) pump and mid-IR (MIR) probe studies of rod-type Te microcrystals, employing a repetitionfrequency-stabilized NIR (800 nm) laser and an MIR (3300 nm) frequency comb. Using interferometrically detected two-color asynchronous sampling (AS) transient absorption (TA) spectroscopy, we measured time-and frequency-resolved TA signals of rodtype Te microcrystals. The frequency-resolved and excitationintensity-dependent AS-TA signals show that the charge carriers undergo relaxation processes with different time constants after photoexcitation. In this work, we found that there are three distinguishable relaxation components that correspond to an ultrafast (a few picoseconds) component associated with the MIR absorption of NIR-excited electrons in the conduction band, two stimulated emission processes associated with the recombination of electrons at the band edge with holes of the valence band with time constants of approximately 75 and 350 ps. We anticipate that the present NIR pump MIR probe spectroscopy with two repetition-frequency-stabilized lasers, which does not require any mechanical pump−probe time delay scanning devices, is useful for studying electron−hole dynamics in the MIR spectral range with femtosecond time resolutions and a few nanoseconds dynamic range measurements in semiconductor microcrystals with MIR band gaps.

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Time-resolved dual-comb spectroscopy with a single electro-optic modulator

Cited by 15 publications

References 25 publications

Analysis of Gas Mixtures with Broadband Dual Frequency Comb Spectroscopy and Unsupervised Learning Neural Network

Analysis of Gas Mixtures with Broadband Dual Frequency Comb Spectroscopy and Unsupervised Learning Neural Network

Thin-film lithium-niobate electro-optic platform for spectrally tailored dual-comb spectroscopy

Unveiling Ultrafast Carrier Dynamics of Tellurium Microcrystals by Two-Color Asynchronous Sampling Infrared Transient Absorption Spectroscopy

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