Article
Optics
Maciej Kowalczyk, Lukasz Sterczewski, Xuzhao Zhang, Valentin Petrov, Zhengping Wang, Jaroslaw Sotor
Summary: This study demonstrates a versatile concept for low-noise dual-comb generation from a single-cavity femtosecond solid-state laser, achieving the lowest relative noise ever demonstrated for a bulk dual-comb source, enabling free-running mode-resolved spectroscopic measurements over a second. The developed dual-comb generation technique can be applied to any solid-state laser exploiting a birefringent active crystal, paving the way toward a new class of highly coherent, single-cavity, dual-comb laser sources operating in various spectral regions.
LASER & PHOTONICS REVIEWS
(2021)
Article
Engineering, Multidisciplinary
D. Charczun, A. Nishiyama, G. Kowzan, A. Cygan, T. Voumard, T. Wildi, T. Herr, V Brasch, D. Lisak, P. Maslowski
Summary: This study demonstrates the first dual-comb realization of cavity mode-width and mode-dispersion spectroscopies, achieving high speed and resolution. By interleaving multiple spectra, it is possible to measure simultaneously the loss and dispersion of both the cavity and the intracavity medium, with potential applications in various fields.
Article
Acoustics
Xinyi Ren, Ming Yan, Zhaoyang Wen, Hui Ma, Ran Li, Kun Huang, Heping Zeng
Summary: Photoacoustic spectroscopy (PAS) using two optical combs offers broad bandwidths, high resolutions, fast acquisition speeds, and wavelength-independent detection. However, sensitivity and specificity are limited. In this study, we demonstrate comb-enabled PAS with enhanced sensitivity and nonlinear spectral hole-burning defined resolution, enabling trace detection and Doppler-free gas sensing.
Article
Multidisciplinary Sciences
Kilian Fritsch, Tobias Hofer, Jonathan Brons, Maksim Iandulskii, Ka Fai Mak, Zaijun Chen, Nathalie Picque, Oleg Pronin
Summary: The authors demonstrate a fully passive scheme of generating high-power dual-combs from a thin-disc gain medium. Compared to traditional dual-comb sources, this system achieves higher peak power and average power, addressing practical applications and frequency conversion challenges.
NATURE COMMUNICATIONS
(2022)
Article
Optics
Sutapa Ghosh, Gadi Eisenstein
Summary: Dual comb spectroscopy (DCS) is a broadband technique that offers high resolution and fast data acquisition. Current designs are based on fiber or solid-state lasers, which require complicated stabilization setups. This work describes a hybrid dual-comb spectrometer that combines a broadband fiber laser and a mode-locked semiconductor laser. The mutual coherence time of 100 seconds has been achieved by injection locking the semiconductor laser to a continuous laser.
Article
Nanoscience & Nanotechnology
Risako Kameyama, Shigekazu Takizawa, Kotaro Hiramatsu, Keisuke Goda
Summary: Researchers have achieved high efficiency and sensitivity in dual-comb coherent Raman spectroscopy by using a quasi-dual-comb source and two-color interferometry, enabling a record high spectral acquisition rate of 100,000 spectra per second with even higher sensitivity than conventional slower dual-comb coherent Raman spectroscopy.
Article
Optics
Haochen Tian, Runmin Li, Lukasz A. Sterczewski, Takashi Kato, Akifumi Asahara, Kaoru Minoshima
Summary: This study presents quasi-real-time dual-comb spectroscopy using two Yb:fiber combs with approximately 750 MHz repetition rates. A computational coherent averaging technique is employed to correct timing and phase fluctuations of the measured dual-comb interferogram. Quasi-real-time phase correction is performed every 1.5 seconds, assisted by coarse radio frequency phase-locking. After resampling and global offset phase correction, the RF comb linewidth is reduced and the line-to-floor ratio increases. Simultaneous offset frequency correction is used to correct the aliased RF spectrum, achieving optical coverage of approximately 180 GHz.
Article
Chemistry, Analytical
Wooram Kim, Jaewon Yang, Jaeyoung Jang, Jeong Seok Oh, Seongheum Han, Seungman Kim, Heesuk Jang, Young-Jin Kim, Seung-Woo Kim
Summary: In this study, a long-distance ranging apparatus was configured to test the principle of dual-comb time-of-flight measurement using ultrashort lasers. The focus was on evaluating the performance in open-air conditions, quantitatively measuring the resolution and stability. The results showed that the dual-comb asynchronous optical pulse sampling technique allowed micrometer-resolved ranging with a repeatability of 2.05 μm over a distance of 648 m in dry weather. The study also evaluated atmospheric effects in different weather conditions and verified the capability of simultaneous determination of multiple targets.
Article
Optics
Mikhail Roiz, Markku Vainio
Summary: This study proposes and demonstrates a versatile method for near- and mid-infrared optical frequency comb generation using multi-seeded femtosecond optical parametric generation, showing flexibility and adjustability.
Article
Optics
J. Pupeikis, B. Willenberg, S. L. Camenzind, A. Benayad, P. Camy, C. R. Phillips, U. Keller
Summary: Single-cavity dual-comb lasers are a new type of ultrafast lasers with wide application potential. The researchers propose a method for multiplexing a single laser cavity to support noise-correlated modes, achieving high-energy, short-pulse, and low-timing-noise laser output.
Article
Optics
Vittoria Schuster, Chang Liu, Robert Klas, Pablo Dominguez, Jan Rothhardt, Jens Limpert, Birgitta Bernhardt
Summary: Dual Comb Spectroscopy has shown its versatile capabilities in molecular fingerprinting in different spectral regions, but has not yet been implemented in the ultraviolet (UV) range. Unlocking this UV spectral window would expand fingerprinting to the electronic energy structure of matter, providing unprecedented spectral resolution.
Article
Optics
Takahiko Mizuno, Yoshiaki Nakajima, Yuya Hata, Takuya Tsuda, Akifumi Asahara, Takashi Kato, Takeo Minamikawa, Takeshi Yasui, Kaoru Minoshima
Summary: Dual-comb microscopy (DCM) is an imaging modality based on optical-frequency-comb (OFC) mode, providing scan-less full-field imaging and confocal amplitude and phase imaging. The practicality of DCM is limited by the complexity and costs of fully frequency-stabilized OFC sources. This study introduces a low-complexity OFC source for DCM using a bidirectional single-cavity dual-comb fiber laser (SCDCFL), and demonstrates the effectiveness of computational image correction in reducing image blur. The proposed method enhances DCM generality and practicality, suggesting a possibility to extend computational image correction to dynamic objects.
Article
Optics
Mathieu Walsh, Alex Tourigny-Plante, Philippe Guay, Khaoula Fdil, Jerome Genest
Summary: This article presents a method to measure and correct for spectral baseline fluctuations in dual-comb interferometry. Fluctuations can be measured by comparing the beat note amplitudes between combs or by separately measuring the repetition rates of the combs and filtering them in the spectral region of interest. Amplitude-dependent spectral variations are characterized using low-resolution Fourier transforms of several interferograms, and a nonstationary filter is applied to properly account for the combs' variations during the measurement, allowing for the removal of statistical and systematic errors.
Article
Optics
C. P. Bauer, S. L. Camenzind, J. Pupeikis, B. Willenberg, C. R. Phillips, U. Keller
Summary: We demonstrate a free-running single-cavity dual-comb optical parametric oscillator (OPO) pumped by a single-cavity dual-comb solid-state laser. The OPO generates high-power idler and signal beams with narrow linewidth and low noise, making it suitable for sensitive mid-infrared dual-comb spectroscopy applications.
Article
Engineering, Electrical & Electronic
Ekaterina Deriushkina, Israel Rebolledo-Salgado, Mikael Mazur, Victor Torres-Company, Peter Andrekson, Jochen Schroeder, Magnus Karlsson
Summary: This paper presents an experimental scheme that combines swept-wavelength interferometry and dual-comb spectroscopy to overcome their limitations. By using a tunable laser source to sweep over the frequency comb spacing and capture all intermediate frequencies, full-field broadband measurements over 1.25 THz comb bandwidth with increased frequency resolution are demonstrated.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Optics
Khalil Eslami Jahromi, Mohammadreza Nematollahi, Roderik Krebbers, Muhammad Ali Abbas, Amir Khodabakhsh, Frans J. M. Harren
Summary: A multi-species trace gas sensor utilizing a fast Fourier transform spectrometer and a broadband supercontinuum source is presented, with high sensitivity and spectral resolution. The performance of the spectrometer is assessed and applied in measuring fruit-produced volatiles.
Article
Optics
M. A. Abbas, K. E. Jahromi, M. Nematollahi, R. Krebbers, N. Liu, G. Woyessa, O. Bang, L. Huot, F. J. M. Harren, A. Khodabakhsh
Summary: A fast-scanning Fourier transform spectrometer with high-repetition-rate mid-infrared supercontinuum sources is presented, covering a wavelength range of 2-10.5 μm. The spectrometer demonstrates its performance for trace gas detection and achieves a noise equivalent absorption sensitivity of similar to 10(-6) cm(-1) Hz(-1/2) per spectral element. Utilizing off-the-shelf optical components, it provides a minimum spectral resolution of 750 MHz.
Article
Biochemistry & Molecular Biology
Ben Henderson, Guilherme Lopes Batista, Carlo G. Bertinetto, Joris Meurs, Dusan Materic, Coen C. W. G. Bongers, Neeltje A. E. Allard, Thijs M. H. Eijsvogels, Rupert Holzinger, Frans J. M. Harren, Jeroen J. Jansen, Maria T. E. Hopman, Simona M. Cristescu
Summary: The study demonstrates that analysis of volatile organic compounds (VOCs) in exhaled breath can provide insights into metabolic processes and monitor physiological responses to exercise and medication. The research showcases the potential of breathomics for non-invasive monitoring of human metabolism changes, particularly focusing on gut microbiome activity in relation to exercise and medication use.
Article
Biochemical Research Methods
Ben Henderson, Gitte Slingers, Michele Pedrotti, Giovanni Pugliese, Michaela Malaskova, Luke Bryant, Tommaso Lomonaco, Silvia Ghimenti, Sergi Moreno, Rebecca Cordell, Frans J. M. Harren, Jochen Schubert, Chris A. Mayhew, Michael Wilde, Fabio Di Francesco, Gudrun Koppen, Jonathan D. Beauchamp, Simona M. Cristescu
Summary: A major challenge in breath research is the lack of standardization in sampling and analysis. The Peppermint Experiment proposed a test utilizing a standardized intervention to explore disparities in breath research across different analytical platforms. The study found large variations in both inter- and intra-dataset, indicating that biological variability plays a key role in the absorption, metabolism, and excretion of compounds in breath.
JOURNAL OF BREATH RESEARCH
(2021)
Article
Optics
Bruce Napier, Ole Bang, Christos Markos, Peter Moselund, Laurent Huot, Frans J. M. Harren, Amir Khodabakhsh, Hans Martin, Floria Ottonello Briano, Laurent Balet, Steve Lecomte, Christian R. Petersen, Niels Israelsen, David Bastviken, Magnus Galfalk, Lukasz Kubiszyn, Piotr Warzybok
Summary: The TRIAGE project aims to develop a smart, compact, and cost-effective air quality sensor network for hyperspectral detection of gases relevant for atmospheric pollution monitoring or dangerous for human health. The sensor is based on a mid-infrared supercontinuum source and includes a novel multi-pass cell and detector for real-time detection, with built-in chemometric analysis and connection to cloud for advanced deep-learning algorithms. Tests on municipal building rooftops and local transport platforms will validate the community-based distributed pollution sensing.
JOURNAL OF PHYSICS-PHOTONICS
(2021)
Article
Microbiology
Veronika E. Mayer, Sybren De Hoog, Simona M. Cristescu, Luciano Vera, Francesc X. Prenafeta-Boldu
Summary: Tropical plant-mutualistic ants grow black fungi of the order Chaetothyriales in their nests as small patches, indicating the importance of these fungi for the colony. The fungi may play a role in reducing the accumulation of toxic volatile organic compounds (VOCs), protecting the ants from harm.
Article
Biochemistry & Molecular Biology
Ben Henderson, Joris Meurs, Carlijn R. Lamers, Guilherme Lopes Batista, Dusan Materic, Carlo G. Bertinetto, Coen C. W. G. Bongers, Rupert Holzinger, Frans J. M. Harren, Jeroen J. Jansen, Maria T. E. Hopman, Simona M. Cristescu
Summary: The aim of this study was to investigate the potential of volatile organic compounds (VOCs) in exhaled breath as non-invasive markers for monitoring the inflammatory response in inflammatory bowel disease (IBD) patients after prolonged moderate-intensity exercise. The results showed that prolonged exercise had similar effects on exhaled breath butanoic acid and plasma cytokines in participants with or without IBD. Butanoic acid showed a significant correlation with the cytokine IL-6, suggesting its potential as a non-invasive marker for exercise-induced inflammation.
Article
Multidisciplinary Sciences
R. Krebbers, N. Liu, K. E. Jahromi, M. Nematollahi, O. Bang, G. Woyessa, C. R. Petersen, G. van Rooij, F. J. M. Harren, A. Khodabakhsh, S. M. Cristescu
Summary: Broadband mid-infrared spectroscopy is an important diagnostic technique for reactive plasmas. The use of a novel MIR supercontinuum source in combination with a custom-built FTIR spectrometer allows for accurate identification and quantification of various reaction products, even those with overlapping absorbance features.
SCIENTIFIC REPORTS
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
M. Nematollahi, A. Khodabakhsh, K. E. Jahromi, R. Krebbers, M. A. Abbas, F. J. M. Harren
Summary: Trace gas detection has numerous applications in research and industry, with molecular absorption spectroscopy being a powerful and non-destructive technique. By utilizing MIR supercontinuum light sources, multi-pass absorption cells, and compact home-built FTS, detection sensitivity can be enhanced.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
M. A. Abbas, F. J. M. Harren, L. Dijk, R. Krebbers, K. E. Jahromi, M. Nematollahi, A. Khodabakhsh
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Christian R. Petersen, Niels M. Israelsen, Getinet Woyessa, Kyei Kwarkye, Rasmus E. Hansen, Christos Markos, Amir Khodabakhsh, Frans J. M. Harren, Peter Rodrigo, Peter Tidemand-Lichtenberg, Christian Pedersen, Ole Bang
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
A. Khodabakhsh, M. Nematollahi, K. E. Jahromi, R. Krebbers, M. A. Abbas, F. J. M. Harren
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)
(2021)
Proceedings Paper
Instruments & Instrumentation
L. Balet, S. Chin, T. Herr, F. Lutolf, P. Renevey, J. van Zaen, S. Dasen, S. Droz, V Schaffter, J. Gouman, G. Buchs, F. J. M. Harren, A. Khodabakhsh, G. Vergara, J. Wigg, H. Martin, L. Huot, P. M. Moselund, C. Hueglin, P. Arsenovic, L. Emmenegger, S. Lecomte
Summary: The compact broadband atmospheric gas spectrometer developed in the EU-H2020 FLAIR project utilizes a mid-IR broadband supercontinuum source and a temperature controlled multipass-cell for efficient detection of gases like methane, achieving a detection limit at sub-ppm level. Successful field measurement campaigns aboard airborne platforms have demonstrated significant results, with particular emphasis on methane detection.
PHOTONIC INSTRUMENTATION ENGINEERING VIII
(2021)
