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
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
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.
Review
Optics
Chuang Lu, Jerome Morville, Lucile Rutkowski, Francisco Senna Vieira, Aleksandra Foltynowicz
Summary: Vernier spectroscopy is a technique that uses optical cavities to filter and enhance the interaction of frequency comb-based technology with the sample, allowing for applications in trace gas detection to precision spectroscopy. It has been implemented using various near- and mid-infrared comb sources.
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
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
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
Multidisciplinary Sciences
Daniel Lisak, Dominik Charczun, Akiko Nishiyama, Thibault Voumard, Thibault Wildi, Grzegorz Kowzan, Victor Brasch, Tobias Herr, Adam J. Fleisher, Joseph T. Hodges, Roman Ciurylo, Agata Cygan, Piotr Maslowski
Summary: The study introduces dual-comb cavity ring-down spectroscopy (DC-CRDS) which allows for the simultaneous acquisition of absorption and dispersion spectra by parallel heterodyne detection of ring-down signals. The combination of broadband frequency combs enhances the sensitivity, spectral resolution, and accuracy of the technique, showing potential for applications in structure and dynamics studies of large molecules, multispecies trace gas detection, and isotopic composition analysis.
SCIENTIFIC REPORTS
(2022)
Article
Optics
Jacob Nurnberg, Benjamin Willenberg, Christopher R. Phillips, Ursula Keller
Summary: This paper demonstrates laser ranging using free-running dual-comb semiconductor and solid-state laser oscillators. Through clever polarization duplexing, dual-comb operation within a single cavity is achieved, and ranging experiments were conducted with two implementations.
Article
Physics, Applied
G. Q. Hu, L. Q. Zhu, G. K. Sun, L. L. Lu, R. You, Y. Liu, W. He, M. L. Dong
Summary: This study investigates the emission of free-running dual-comb pulses with overlapping spectra and controlled repetition rate difference in a single birefringent fiber cavity. Various mechanisms for soliton formation are observed and validated, enabling switchable and tunable dual-comb pulse emissions. The study highlights the potential of simplifying the amplification system and single-cavity dual-comb source with overlapping spectra and passive mutual coherence between pulses.
APPLIED PHYSICS LETTERS
(2022)
Article
Optics
Yoshiaki Nakajima, Yugo Kusumi, Kaoru Minoshima
Summary: This study proposes a mechanical sharing, dual-comb fiber laser with an all-polarization-maintaining cavity configuration and a nonlinear amplifying loop mirror mode-locking mechanism, which achieves highly correlated dual optical frequency combs with high relative stability. The laser setup simplifies dual-comb spectroscopy by suppressing common-mode noise through mechanical sharing of the laser cavity.
Article
Quantum Science & Technology
Haowei Shi, Zaijun Chen, Scott E. Fraser, Mengjie Yu, Zheshen Zhang, Quntao Zhuang
Summary: Dual-comb interferometry utilizes two laser frequency combs to achieve unprecedented capability in spectroscopy applications. We propose an entanglement-enhanced dual-comb spectroscopy protocol that leverages quantum resources to significantly improve the signal-to-noise ratio performance, considering practical noises.
NPJ QUANTUM INFORMATION
(2023)
Article
Optics
Yujia Zhang, Minjian Lu, Jiaqi Hu, Yan Li, Perry Ping Shum, Jinna Chen, Haoyun Wei
Summary: Rapid coherent Raman hyperspectral imaging has potential applications in sensing, medical diagnostics, and dynamic metabolism monitoring. However, current multiplex coherent anti-Stokes Raman scattering (CARS) microscopy is limited by the spectrometer integration time, resulting in decreased signal-to-noise ratio (SNR) and poor imaging quality. This study presents a dual-comb coherent Raman hyperspectral microscopy system that combines a rapid delay-spectral focusing method and deep learning to achieve a spectral acquisition speed of 36 kHz, approximately 4 frames/s, with improved SNR and imaging quality.
Review
Optics
Chenghong Zhang, Fangrui Qu, Peiwen Ou, Haoqi Sun, Shi He, Bo Fu
Summary: Dual-comb spectroscopy has been extensively studied in various applications, and recently, single-cavity dual combs have emerged as a compelling option for simplifying measuring systems. This review summarizes the progress and distinctive advantages of single-cavity dual comb lasers, including their implementation techniques and typical applications. The principles of optical frequency comb and dual-comb spectroscopy are introduced, and an outlook on the development of single-cavity dual combs is presented.
Article
Optics
Erin M. Adkins, David A. Long, Adam J. Fleisher, Joseph T. Hodges
Summary: Using frequency-agile rapid scanning cavity ring-down spectroscopy, the line intensities and line shape parameters of N-14(2) O-16 in air near 1.6 μm were measured and modeled with multi-spectrum fits of Voigt and speed-dependent Voigt profiles. Deviations of several percent relative to values in HITRAN 2016 were found, with measured intensities having relative combined standard uncertainties of approximately 1%, which is five times smaller than literature values. Comparison with experimental literature values for other rotation-vibration bands of N2O showed significant differences in magnitude and J-dependence, suggesting that the assumption of band-independent line shape parameters is not appropriate for applications requiring high spectral fidelity.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2021)
Article
Physics, Multidisciplinary
Agata Cygan, Adam J. Fleisher, Roman Ciurylo, Keith A. Gillis, Joseph T. Hodges, Daniel Lisak
Summary: Cavity build up dispersion spectroscopy is a new technique that improves measurement speed and reduces sensitivity to detector nonlinearity in cavity-enhanced spectroscopy. It enables accurate measurements of dispersive frequency shifts, contributing to the validation of quantum theory and engineering of ultracold chemistry.
COMMUNICATIONS PHYSICS
(2021)
Article
Physics, Multidisciplinary
Adam J. Fleisher, Hongming Yi, Abneesh Srivastava, Oleg L. Polyansky, Nikolai F. Zobov, Joseph T. Hodges
Summary: Isotope ratio measurements face challenges due to the instability of composition in reference samples. A calibration-free method using infrared spectroscopy is now providing accurate measurements traceable to International System of Units standards. Efforts are underway to elucidate the stable carbon isotope ratio of Vienna PeeDee Belemnite, with independent measurement techniques required to support it.
Article
Optics
G. Winkler, L. W. Perner, G-W Truong, G. Zhao, D. Bachmann, A. S. Mayer, J. Fellinger, D. Follman, P. Heu, C. Deutsch, D. M. Bailey, H. Peelaers, S. Puchegger, A. J. Fleisher, G. D. Cole, O. H. Heckl
Summary: The study presents a novel high-reflectance coating technology with record-low excess optical loss, verified through a suite of optical measurements. The unique microfabrication process reduces scatter loss and the low background doping during epitaxial growth significantly reduces absorption.
Article
Optics
Z. D. Reed, B. J. Drouin, D. A. Long, J. T. Hodges
Summary: The study presents measurements of molecular transition frequencies using comb-locked cavity ring-down spectroscopy technique, reporting vacuum transition frequencies of Doppler-broadened (CO2)-C-12-O-16 with high accuracy. A global four-state model was fitted to the data with a precision of 4 kHz. Moreover, an interaction between (30012) and (33301) states was identified and quantified, which was accounted for in the global fit.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2021)
Article
Optics
Helene Fleurbaey, Zachary D. Reed, Erin M. Adkins, David A. Long, Joseph T. Hodges
Summary: This study presents broadband spectroscopic parameters of O-16(2) in the a(1) Delta(g) - X-3 Sigma(-)(g) (0,0) band near 1.27 µm. The parameters were determined through multi-spectrum fitting of line profiles, showing strong numerical correlation between Dicke narrowing and speed dependent widths. The relative standard uncertainties for line intensities and broadening coefficients were 0.16% and 0.05% respectively.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2021)
Correction
Physics, Multidisciplinary
Adam J. Fleisher, Hongming Yi, Abneesh Srivastava, Oleg L. Polyansky, Nikolai F. Zobov, Joseph T. Hodges
Article
Optics
Jianfei Tian, Gang Zhao, Adam J. Fleisher, Weiguang Ma, Suotang Jia
Summary: The study presents a simple and universal technique for optical feedback cavity enhanced absorption spectroscopy using a linear Fabry-Perot cavity. By appropriately controlling the feedback phase, a diode laser can be stabilized to cavity modes without interference from direct reflection. With robust handling of the feedback phase and balanced detection, an impressive detection limit of 1.3 x 10(-9) cm(-1) was achieved within a short 30-second integration time, enabling precise monitoring of atmospheric methane concentrations over a 72-hour period.
Article
Optics
Gang Zhao, Jianfei Tian, Joseph T. Hodges, Adam J. Fleisher
Summary: Frequency-stabilized mid-infrared lasers are important for precision molecular spectroscopy, but complex stabilization schemes have limited their implementation. This study demonstrates optical self-locking of a quantum cascade laser to a two-mirror cavity, resulting in stable frequencies with significant linewidth reduction. Additionally, two-photon cavity-enhanced absorption spectroscopy of an N2O overtone transition near a wavelength of 4.53 um was successfully carried out.
Article
Optics
Zachary D. Reed, Brian J. Drouin, Joseph T. Hodges
Summary: This paper reports a significant correction to the transition frequencies and spectroscopic constants of (CO2)-C-12-O-16 recently reported, where 44 previously reported frequencies are modified by including photon-absorption-induced recoil shifts, leading to a decrease of approximately 1.7 kHz in all transition frequencies. Published by Elsevier Ltd.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2021)
Article
Optics
I. E. Gordon, L. S. Rothman, R. J. Hargreaves, R. Hashemi, E. Karlovets, F. M. Skinner, E. K. Conway, C. Hill, R. Kochanov, Y. Tan, P. Wcislo, A. A. Finenko, K. Nelson, P. F. Bernath, M. Birk, V Boudon, A. Campargue, K. Chance, A. Coustenis, B. J. Drouin, J-M Flaud, R. R. Gamache, J. T. Hodges, D. Jacquemart, E. J. Mlawer, A. Nikitin, V. Perevalov, M. Rotger, J. Tennyson, G. C. Toon, H. Tran, V. G. Tyuterev, E. M. Adkins, A. Baker, A. Barbe, E. Cane, A. G. Csaszar, A. Dudaryonok, O. Egorov, A. J. Fleisher, H. Fleurbaey, A. Foltynowicz, T. Furtenbacher, J. J. Harrison, J-M Hartmann, V-M Horneman, X. Huang, T. Karman, J. Karns, S. Kassi, I Kleiner, V Kofman, F. Kwabia-Tchana, N. N. Lavrentieva, T. J. Lee, D. A. Long, A. A. Lukashevskaya, O. M. Lyulin, V. Yu Makhnev, W. Matt, S. T. Massie, M. Melosso, S. N. Mikhailenko, D. Mondelain, H. S. P. Mueller, O. Naumenko, A. Perrin, O. L. Polyansky, E. Raddaoui, P. L. Raston, Z. D. Reed, M. Rey, C. Richard, R. Tobias, I Sadiek, D. W. Schwenke, E. Starikova, K. Sung, F. Tamassia, S. A. Tashkun, J. Vander Auwera, I. A. Vasilenko, A. A. Vigasin, G. L. Villanueva, B. Vispoel, G. Wagner, A. Yachmenev, S. N. Yurchenko
Summary: The HITRAN database is a valuable compilation of molecular spectroscopic parameters used to predict and simulate light transmission and emission in gaseous media. The 2020 quadrennial edition of HITRAN incorporates recent experimental and theoretical data, with major updates to all five components for increased accuracy and coverage in atmospheric observations.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2022)
Article
Multidisciplinary Sciences
Daniel Lisak, Dominik Charczun, Akiko Nishiyama, Thibault Voumard, Thibault Wildi, Grzegorz Kowzan, Victor Brasch, Tobias Herr, Adam J. Fleisher, Joseph T. Hodges, Roman Ciurylo, Agata Cygan, Piotr Maslowski
Summary: The study introduces dual-comb cavity ring-down spectroscopy (DC-CRDS) which allows for the simultaneous acquisition of absorption and dispersion spectra by parallel heterodyne detection of ring-down signals. The combination of broadband frequency combs enhances the sensitivity, spectral resolution, and accuracy of the technique, showing potential for applications in structure and dynamics studies of large molecules, multispecies trace gas detection, and isotopic composition analysis.
SCIENTIFIC REPORTS
(2022)
Article
Physics, Multidisciplinary
Katarzyna Bielska, Aleksandra A. Kyuberis, Zachary D. Reed, Gang Li, Agata Cygan, Roman Ciurylo, Erin M. Adkins, Lorenzo Lodi, Nikolay F. Zobov, Volker Ebert, Daniel Lisak, Joseph T. Hodges, Jonathan Tennyson, Oleg L. Polyansky
Summary: This research measures and calculates the intensities of lines in the near-infrared second overtone band (3-0) of (CO)-C-12-O-16 with an unprecedented level of precision and accuracy. Results from two laboratories using two independent techniques show agreement between theory and experiment better than 1 parts per thousand. Similarly, Fourier transform spectroscopy measurements of stronger lines in this band also demonstrate consistency with theory at the 1 parts per thousand level. This highly accurate set of intensities can serve as a reference for future spectroscopic peak area measurements to reduce biases.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Zachary D. Reed, Ha Tran, Hoa N. Ngo, Jean-Michel Hartmann, Joseph T. Hodges
Summary: Using cavity ring-down spectroscopy, we accurately modeled the spectral core of CO R-branch transitions in N-2 by introducing a pressure-dependent line area for the first few rotational quantum numbers, J. This correction becomes negligible as J increases and is insignificant in CO-He mixtures. Molecular dynamics simulations support the results and attribute the effect to non-Markovian behavior of collisions at short times. This work is important for accurate determinations of line intensities, spectroscopic databases, climate predictions, and remote sensing.
PHYSICAL REVIEW LETTERS
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Gang Zhao, D. Michelle Bailey, Adam J. Fleisher, Joseph T. Hodges, Kevin K. Lehmann
Summary: This study demonstrates Doppler-free two-photon cavity ring-down spectroscopy using a narrow linewidth quantum cascade laser locked to a high-finesse cavity, and reports the two-photon absorption of N2O-N-14-O-16 at around 2207.507 cm(-1).
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)