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
Jan Hrabina, Martin Hosek, Simon Rerucha, Martin Cizek, Zdenek Pilat, Massimo Zucco, Josef Lazar, Ondrej Cip
Summary: The wide span and high density of lines in the rovibrational spectrum of hydrogen cyanide make it a valuable medium for referencing lasers in optical communication and dimensional metrology. In this study, we determined the center frequencies of molecular transitions of the H13C14N isotope with high precision. We achieved a forty-fold improvement in line centers' resolution compared to previous results.
Article
Environmental Sciences
Qinghui Li, Xuejin Sun, Xiaolei Wang
Summary: This study proposed a cloud phase recognition algorithm based on the threshold of parameter alpha, aiming to improve the accuracy of obtaining cloud top height with OCO-2. The results showed that alpha can effectively distinguish between ice clouds and water clouds, providing a basis for further cloud phase recognition.
Article
Materials Science, Multidisciplinary
Jianhua Huang, Jie Wu, Yujin Chen, Xinghong Gong, Yanfu Lin, Zundu Luo, Yidong Huang
Summary: An Er:Yb:Ba3Gd(PO4)(3) crystal was grown using the Czochralski method. The spectral properties of the crystal, including absorption and fluorescence spectra, as well as fluorescence decay at room temperature, were investigated. The fluorescence quantum efficiency of Er3+ ions at the I-4(13/2) level and the energy transfer efficiency from Yb3+ to Er3+ ions were calculated. For the first time, a continuous wave diode-pumped Er:Yb:Ba3Gd(PO4)(3) laser operating at 1.5-1.6 μm with an output power of approximately 73.9 mW and a slope efficiency of 16.3% was achieved in the co-doped phosphate crystal.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Optics
Wissam Fakhardji, Ha Tran, Olivier Pirali, Jean-Michel Hartmann
Summary: Using a 101 m absorption path-length cell, Fourier transform spectra of H-2+CO2 mixtures were measured at room temperature in the region around 2.4 μm. These measurements validate the previous independent calculations.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2022)
Article
Chemistry, Physical
H. Fleurbaey, P. Cermak, A. Campargue, S. Kassi, D. Romanini, O. Votava, D. Mondelain
Summary: Saturation spectroscopy was used to determine the absolute frequencies of 107 ro-vibrational transitions in the 2 μm region. The measured Lamb dips were obtained with high accuracy using a cavity ring-down spectrometer linked to an optical frequency comb. The resulting transition frequency measurements provide valuable information for CO2 monitoring in the atmosphere.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Optics
J. Wang, C-L Hu, A-W Liu, Y. R. Sun, Y. Tan, S-M Hu
Summary: Molecular transitions serve as natural frequency standards for spectroscopy, telecommunication, and astrophysics, with frequency accuracy being crucial for fundamental physics tests. By measuring Lamb dips and deriving rotational spectroscopic parameters with high accuracy, refinements in ro-vibrational spectroscopic constants were achieved, allowing for the analysis of pure rotational line lists in specific frequency ranges.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2021)
Article
Materials Science, Multidisciplinary
Yuantao Zhao, Yang Li, Shengzhi Zhao, Tao Li, Ping Hu, Jiajia Mao, Kejian Yang, Tianli Feng
Summary: In this paper, a diode pumped passive Q-switching Tm, Ho:GAGG laser with a graphene saturable absorber mirror is reported. It achieved high power and stable pulse output.
Article
Chemistry, Physical
Yonghui Wang, Subhasis Adhikari, Harmen van der Meer, Junyan Liu, Michel Orrit
Summary: Photothermal (PT) microscopy has great potential in imaging single absorbing nano-objects in soft matter and biological systems. In this study, we showed that the photothermal signal can be significantly enhanced by near-critical CO2, a cheaper alternative to xenon. The use of thin capillaries and COMSOL simulations further supported our experimental findings.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Optics
Jasper R. Stroud, James B. Simon, Gerd A. Wagner, David F. Plusquellic
Summary: A chirped-pulse interleaving method using electro-optic phase modulators (EOM) to generate dual optical frequency combs in a free-running all-fiber system is reported. This method allows for easy modification of the linear scan rate and comb resolution by over three orders of magnitude, and significantly increases the spectral bandwidth coverage. These techniques are suitable for applications in remote sensing of greenhouse gas emissions, molecular reaction dynamics, and sub-Doppler studies across wide spectral regions accessible to EOMs.
Article
Energy & Fuels
Jun Wu, Yasong Sun, Biyuan Wu, Chunlei Sun, Xiaohu Wu
Summary: A polarization-insensitive broadband and wide-angle solar absorber has been proposed, which achieves high absorption in the visible to near-infrared regions with stable performance at different viewing angles and certain dimensional tolerance. It has potential applications in solar energy capturing and conversion, thermo-photovoltaic devices and thermal emitters.
Article
Chemistry, Physical
Wenxing Yang, Yuchang Li, Fang Chen, Shubo Cheng, Wenxing Yang, Boyun Wang, Zao Yi
Summary: In this paper, a TM polarization multi-band absorber is achieved in a graphene-Ag asymmetrical grating structure. The proposed absorber can achieve perfect absorption at 1108 nm, 1254 nm, and 1712 nm (the absorption exceeds 98.4% at the three peaks). Results show that the perfect absorption effect originates from the excitation of magnetic polaritons (MPs) in the silver ridge grating; a LC equivalent circuit model is utilized to confirm the finite-difference-time-domain (FDTD) simulation. The influences of the incident angle, polarization angle, and geometrical size on the absorption spectrum are investigated. Moreover, a quadruple band absorber and a quintuple band absorber are also designed by introducing more silver grating ridges in one period. The proposed graphene-Ag asymmetrical structure has some advantages compared with other absorbers such as the ability to be independently tuned and a simple structure. Thus, the proposed structure can be applied in the areas of multiple absorption switches, near-infrared modulators, and sensors.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Wenxing Wang, Yuchang Li, Fang Chen, Shubo Cheng, Wenxing Yang, Boyun Wang, Zao Yi
Summary: In this paper, a TM polarization multi-band absorber is achieved in a graphene-Ag asymmetrical grating structure. The proposed absorber can achieve perfect absorption at three peaks, which are 1108 nm, 1254 nm, and 1712 nm, with absorption exceeding 98.4%. The perfect absorption effect is attributed to the excitation of magnetic polaritons (MPs) in the silver ridge grating, and a LC equivalent circuit model is used to validate the simulation results obtained from finite-difference-time-domain (FDTD) method.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Optics
R. Lisiecki, B. Macalik, J. Komar, R. Kowalski, A. Strzep, Zhen Zhang, Zhonghan Zhang, Yunfei Wang, Liangbi Su, W. Ryba-Romanowski
Summary: In this study, single crystals of CaF2 and SrF2 doped with Er3+ ions at different concentrations were grown using the temperature gradient technique. The absorption and luminescence spectra were measured at different temperatures to investigate the effect of temperature on the spectral bands and the efficiency of resonant optical pumping near 1.6 μm. The results provide valuable insights into the lasing ability of Er3+ ions embedded in CaF2 and SrF2 hosts.
APPLIED PHYSICS B-LASERS AND OPTICS
(2023)
Article
Acoustics
Golakoti Pavan, Sneha Singh
Summary: This paper presents a new Porous Labyrinthine Acoustic Metamaterial (PLAM) that achieves near-perfect sound absorption at low frequencies through a folded slit labyrinthine structure in a micro-porous matrix. The research provides a new approach for designing labyrinthine metamaterials with broader sound absorption range for aerodynamic noise control applications.
Article
Spectroscopy
Alejandro De la Cadena, Carlo M. Valensise, Marco Marangoni, Giulio Cerullo, Dario Polli
JOURNAL OF RAMAN SPECTROSCOPY
(2020)
Article
Multidisciplinary Sciences
Riccardo Gotti, Thomas Puppe, Yuriy Mayzlin, Julian Robinson-Tait, Szymon Wojtewicz, Davide Gatti, Bidoor Alsaif, Marco Lamperti, Paolo Laporta, Felix Rohde, Rafal Wilk, Patrick Leisching, Wilhelm G. Kaenders, Marco Marangoni
SCIENTIFIC REPORTS
(2020)
Article
Physics, Multidisciplinary
R. Gotti, M. Lamperti, D. Gatti, S. Wojtewicz, T. Puppe, Y. Mayzlin, B. Alsaif, J. Robinson-Tait, F. Rohde, R. Wilk, P. Leisching, W. G. Kaenders, P. Laporta, M. Marangoni
NEW JOURNAL OF PHYSICS
(2020)
Article
Thermodynamics
Mohammad Khaled Shakfa, Mhanna Mhanna, Hanfeng Jin, Dapeng Liu, Khalil Djebbi, Marco Marangoni, Aamir Farooq
Summary: Benzene is an important molecule in various industrial, environmental, and chemical systems, playing a crucial role in combustion processes. A new laser-based diagnostic using a DFG laser system was developed for quantitative and interference-free measurements of benzene in the MIR region. The diagnostic was demonstrated in high-temperature experiments for studying benzene formation and consumption kinetics.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
Article
Physics, Multidisciplinary
M. Lamperti, R. Gotti, D. Gatti, M. K. Shakfa, E. Cane, F. Tamassia, P. Schunemann, P. Laporta, A. Farooq, M. Marangoni
COMMUNICATIONS PHYSICS
(2020)
Review
Chemistry, Multidisciplinary
R. Gotti, M. Lamperti, D. Gatti, M. Marangoni
Summary: Laser-based primary thermometry using Doppler broadening to determine the absolute temperature of a gas has made significant advancements, reaching an accuracy of about 10 ppm in the best cases. This method is expected to contribute to the practical realization of the new kelvin and address the uncertainties of the 1990 international temperature scale.
JOURNAL OF PHYSICAL AND CHEMICAL REFERENCE DATA
(2021)
Review
Physics, Multidisciplinary
Renzo Vanna, Alejandro De la Cadena, Benedetta Talone, Cristian Manzoni, Marco Marangoni, Dario Polli, Giulio Cerullo
Summary: Vibrational microscopies play a key role in cancer diagnosis, providing direct chemical and biomolecular information for more accurate tumor identification. Novel technologies such as coherent Raman scattering and photothermal infrared microscopy show promise in overcoming limitations of traditional techniques.
RIVISTA DEL NUOVO CIMENTO
(2022)
Article
Optics
Andrea Villa, Aaron M. Ross, Riccardo Gotti, Marco Lamperti, Francesco Scotognella, Giulio Cerullo, Marco Marangoni
Summary: This study introduces an optical parametric amplifier pumped by an amplified femtosecond Yb:KGY laser to generate broadly tunable mid-infrared pulses covering the entire vibrational spectrum. The setup simplifies traditional methods and allows for high conversion efficiencies, with potential applications in ultrafast vibrational spectroscopy and infrared microscopy.
Article
Chemistry, Physical
Marco Lamperti, Lucile Rutkowski, Davide Gatti, Riccardo Gotti, Luca Moretti, Dario Polli, Giulio Cerullo, Marco Marangoni
Summary: We discuss the layout and performance of a newly developed high-resolution Stimulated Raman Loss spectrometer for accurate studies of hydrogen isotopologues and Raman active transitions. The spectrometer achieves a frequency accuracy of 50 kHz thanks to frequency comb calibration and active alignment. It allows for shot-noise limited detection, signal enhancement, active flattening of the spectral baseline, and efficient averaging of Raman spectra over long measurement times.
Proceedings Paper
Engineering, Electrical & Electronic
R. Gotti, M. Lamperti, D. Gatti, S. Wojtewicz, T. Puppe, Y. Mayzlin, B. Alsaif, J. Robinson-Tait, F. Rohde, R. Wilk, P. Leisching, W. G. Kaenders, P. Laporta, M. Marangoni
Summary: A new optical approach to gas thermometry is tested using a widely tunable comb-locked frequency-swept synthesizer, by globally fitting multiple molecular absorption lines of the same band at different pressures.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Marco Lamperti, Lucile Rutkowski, Daniele Ronchetti, Davide Gatti, Riccardo Gotti, Giulio Cerullo, Franck Thibault, Hubert Jozwiak, Szymon Wojtewicz, Piotr Maslowski, Piotr Wcislo, Dario Polli, Marco Marangoni
Summary: The study introduces a coherent Raman spectrometer calibrated with a comb for advanced research on collisional physics of molecules, addressing the lack of dipole moment in the H-2 system.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
R. Gotti, M. Lamperti, D. Gatti, M. K. Shakfa, E. Cane, F. Tamassia, P. Schunemann, P. Laporta, A. Farooq, M. Marangoni
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Marco Lamperti, Lucile Rutkowski, Daniele Ronchetti, Davide Gatti, Riccardo Gotti, Giulio Cerullo, Franck Thibault, Hubert Jozwiak, Szymon Wojtewicz, Piotr Maslowski, Piotr Wcislo, Dario Polli, Marco Marangoni
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Mohammad Khaled Shakfa, Marco Lamperti, Riccardo Gotti, Davide Gatti, Ali Elkhazraji, Khaiyom Hakimov, Marco Marangoni, Aamir Farooq
Summary: The article introduces a mid-infrared laser source based on the difference frequency generation process, using a quantum cascade laser and a CO2 gas laser as the pump and signal sources. The laser source, realized through a nonlinear crystal, offers fine tunability for high-resolution absorption measurements of ethylene and acetylene.
NONLINEAR FREQUENCY GENERATION AND CONVERSION: MATERIALS AND DEVICES XX
(2021)
Article
Optics
S. Wojtewicz, R. Gotti, D. Gatti, M. Lamperti, P. Laporta, H. Jozwiak, F. Thibault, P. Wcislo, M. Marangoni
