Article
Optics
E. F. Martynovich, N. L. Lazareva, S. A. Zilov
Summary: The study investigates the creation of luminescence centers by laser radiation in transparent anisotropic crystals using MgF2 as an example. A luminescent method was developed to monitor the concentration of created centers, with a direct proportionality between luminescence intensity and center concentration. Coherent pairs of femtosecond laser pulses were used to longitudinally position light action on the medium during the creation of spatially modulated structures. The experiments also showed an intermediate mechanism of multiphoton-tunneling ionization during laser defects formation in crystals.
JOURNAL OF LUMINESCENCE
(2021)
Article
Optics
Zhedong Zhang, Tao Peng, Xiaoyu Nie, Girish S. Agarwal, Marlan O. Scully
Summary: This study investigates the new capabilities provided by entangled photons in coherent Raman spectroscopy and develops an ultrafast frequency-resolved Raman spectroscopy using entangled photons. By utilizing quantum correlation between photons, this technique exhibits both temporal and spectral resolutions. The study also reveals a microscopic theory for electronic coherence dynamics.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Thermodynamics
Yunfei Song, Honglin Wu, Gangbei Zhu, Yangyang Zeng, Guoyang Yu, Yanqiang Yang
Summary: A simplified thermometry based on femtosecond coherent anti-Stokes Raman spectroscopy (fs-CARS) is proposed to measure the temperature of steady-state high-temperature flame. Nitrogen molecules are used as a temperature gage, and the polarization beats appearing in the initial partial fs-CARS transients are used to access the temperature. Experimental results show the effectiveness of this method, and it is suggested to be more reliable than traditional platinum-rhodium thermocouples.
COMBUSTION AND FLAME
(2022)
Article
Engineering, Electrical & Electronic
Nicolae Lobontiu, Morgan Moses, Jozef Hunter, Daniel Min, Mircea Gh. Munteanu
Summary: The paper proposes a new three-dimensional flexible hinge that consists of serially linked straight- and circular-axis segments distributed in two layers. This novel hinge configuration enables large displacements and is suitable for precision-compliant mechanisms requiring large spatial workspaces. The article presents simplified geometry-based analytical compliance models to connect loads to hinge displacements, which are validated through finite element simulations and experimental prototype testing. Moreover, a compliance-based analytical model evaluates the maximum loads and resulting displacements, while two small-deformation analytical models investigate the relationship between geometric parameters and hinge performance qualifiers.
Article
Engineering, Electrical & Electronic
Myungguk Lee, Jaeik Cho, Junung Choi, Won Joon Choi, Jiyun Lee, Iksu Jang, Changjae Moon, Gain Kim, Byungsub Kim
Summary: This paper presents compact single-ended wireline transceivers with software-generated receiver front-ends. The developed software framework significantly shortens the physical design time of 1/N-rate wireline receiver front-ends. The software-generated receiver front-ends achieved nearly the same performances as the manually-designed ones but with a much shorter design time and smaller area.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
(2023)
Article
Chemistry, Multidisciplinary
Lucas Schaper, Sven Ackermann, Enrico Allaria, Philipp Amstutz, Karolin Baev, Martin Beye, Christopher Gerth, Ingmar Hartl, Wolfgang Hillert, Katja Honkavaara, Mehdi Mohammad Kazemi, Tino Lang, Pardis Niknejadi, Fabian Pannek, Juliane Roensch-Schulenburg, Dmitrii Samoilenko, Evgeny Schneidmiller, Siegfried Schreiber, Markus Tischer, Mathias Vogt, Mikhail Yurkov, Johann Zemella
Summary: The successful development of high gain free-electron lasers has provided X-ray scientists with new possibilities for studying matter in different states. New experimental techniques have been developed to take advantage of unprecedented photon properties, leading to a virtuous collaboration between machine experts and photon users. Advanced FEL schemes are now capable of tailoring photon properties to specific experimental demands, offering options such as tunable wavelength X-ray pulses with high brilliance and short pulse characteristics.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Electrical & Electronic
Farhad Akhoundi, N. Peyghambarian
Summary: This all-fiber femtosecond laser is able to generate three wavelengths at 1030 nm, 1550 nm, and 1900 nm from a single cavity, utilizing fiber optics nonlinearity. The synchronized outputs reduce size, power consumption, and cost compared to three individual cavities. The laser can be packaged in a compact form factor of 20 cm x 20 cm x 20 cm.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2021)
Article
Instruments & Instrumentation
Haoyuan Zhong, Changhua Bao, Tianyun Lin, Shaohua Zhou, Shuyun Zhou
Summary: Developing a widely tunable vacuum ultraviolet (VUV) source with a sub-100 fs pulse duration is critical for ultrafast pump-probe techniques. By designing a new KBBF device, an optimum pulse duration of 55 fs is obtained, and a high time resolution of 81-95 fs is achieved for probe photon energies ranging from 5.3-7.0 eV.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Article
Optics
Dong Hoon Song, Hong-Seok Seo
Summary: Achieving high-power mode-locking in Ti:sapphire lasers is a challenge, but through spectral combination, an output power of 1W and a pulse energy of 14.5nJ have been successfully demonstrated.
Article
Optics
A. M. Vyunishev, V. G. Arkhipkin, A. S. Chirkin
Summary: Quasi-phase matched nonlinear frequency conversion in three dimensional nonlinear photonic crystals enables efficient multi-order nonlinear diffraction, which can be achieved by a proper choice of the modulation period of the NPC structure. The spatial distribution of the second harmonic intensity is influenced by Cherenkov- and Raman-Nath-type nonlinear diffraction. These findings open up new possibilities for ultrafast nonlinear photonics and parametric interactions in optics.
LASER PHYSICS LETTERS
(2023)
Article
Astronomy & Astrophysics
C. Zhang, Feng-Yao Zhu, Tie Liu, Z-Y Ren, H-L Liu, Ke Wang, J-W Wu, Y. Zhang, J-W Zhou, K. Tatematsu, Guido Garay, Anandmayee Tej, Shanghuo Li, W. F. Xu, Chang Won Lee, Leonardo Bronfman, Archana Soam, D. Li
Summary: Hydrogen radio recombination lines are used to study the properties of resolved UC H II regions. A large sample of these regions were investigated and it was found that their electron density, temperature, and abundance ratios are similar to the central star regions, while the helium abundance ratio is higher in the boundary region.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Optics
Yuechen Jia, Feng Chen
Summary: Femtosecond (Fs) laser micro-/nano-fabrication technology enables the direct definition of nanostructures with three-dimensional geometric features and tailored photonic functionalities in a facile manner. This technology is widely applicable to various material families and has the potential to go beyond the optical diffraction limit.
Article
Computer Science, Information Systems
Yahui Zhu, Jing Cai, Wei Qin, Wenwen Yang, Jianxin Chen
Summary: This paper presents a compact input-reflectionless balanced bandpass filter (BPF) with flexible bandwidth (BW) using a three-line coupled structure (TLCS). The TLCS is applied to achieve the bandpass response for the differential mode (DM), and the input coupled-feed line of the TLCS is reused in the input absorption network. Detailed analyses of the ratio of the two-part BWs have been given for the first time, which is vital for the passband flatness and reflectionless feature. A prototype with a compact layout is designed and measured, showing good performance such as low insertion loss, wide upper stopband for the DM bandpass response, and wideband reflectionless and noise absorption.
FRONTIERS OF INFORMATION TECHNOLOGY & ELECTRONIC ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Li Liu, Yangguang Liu, Xiao-Zhi Gao, Xiaomin Zhang
Summary: This study introduces a cost-effective tunable millimeter-wave frequency synthesizer based on an ultra-wideband electro-optic frequency comb. The synthesizer boasts ultra-low phase noise, quasi-tunable frequency, and a simple structure, making it suitable for 5G+ transmission.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Electrical & Electronic
Ramin Kheyri, Hossein Gholizadeh Narm, Ebrahim Babaei
Summary: This paper proposes a step-up three-phase multilevel inverter based on switched capacitor cells, which reduces the number of components and can boost the voltage. The inverter also features self-voltage balancing of the capacitors and low total harmonic distortion due to the use of level-shifted pulse width modulation for switching. Experimental results with a three-phase induction motor as a load are presented.
INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS
(2023)
Article
Multidisciplinary Sciences
Siqi Li, Taran Driver, Philipp Rosenberger, Elio G. Champenois, Joseph Duris, Andre Al-Haddad, Vitali Averbukh, Jonathan C. T. Barnard, Nora Berrah, Christoph Bostedt, Philip H. Bucksbaum, Ryan N. Coffee, Louis F. DiMauro, Li Fang, Douglas Garratt, Averell Gatton, Zhaoheng Guo, Gregor Hartmann, Daniel Haxton, Wolfram Helml, Zhirong Huang, Aaron C. LaForge, Andrei Kamalov, Jonas Knurr, Ming-Fu Lin, Alberto A. Lutman, James P. MacArthur, Jon P. Marangos, Megan Nantel, Adi Natan, Razib Obaid, Jordan T. O'Neal, Niranjan H. Shivaram, Aviad Schori, Peter Walter, Anna Li Wang, Thomas J. A. Wolf, Zhen Zhang, Matthias F. Kling, Agostino Marinelli, James P. Cryan
Summary: In this study, time-resolved measurements were performed using attosecond soft x-ray pulses to track the evolution of a coherent core-hole excitation in nitric oxide. The coherent electron motion was controlled by tuning the photon energy of the x-ray pulse.
Article
Multidisciplinary Sciences
Johannes Schoetz, Ancyline Maliakkal, Johannes Bloechl, Dmitry Zimin, Zilong Wang, Philipp Rosenberger, Meshaal Alharbi, Abdallah M. Azzeer, Matthew Weidman, Vladislav S. Yakovlev, Boris Bergues, Matthias F. Kling
Summary: This study presents systematic experimental studies on the signal formation in gas-phase photoconductive sampling and proposes a theoretical model based on the Ramo-Shockley theorem. Numerical simulations provide a quantitative comparison with experimental results and help to identify the roles of electron-neutral scattering and mean-field charge interactions. The results show that existing heuristic models are valid only in a limited range and are affected by macroscopic effects.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Hirofumi Yanagisawa, Markus Bohn, Florian Goschin, Ari P. Seitsonen, Matthias F. Kling
Summary: By applying strong direct current electric fields on a sharp metallic tip, electrons can be emitted radially from the apex to vacuum, magnifying nanoscopic information on the apex and creating a field emission microscope (FEM). This study used fullerene molecules to characterize the molecule-covered tip through experiments and simulations. The results suggest that the peculiar electron emission patterns originate from a molecule layer formed on the tip under strong DC electric fields.
SCIENTIFIC REPORTS
(2022)
Article
Optics
Jennifer D. T. Kruschwitz, Michael Trubetskov, Jason Keck
Summary: The paragraph introduces the design problems for the Optical Interference Coating (OIC) 2022 Topical Meeting, which include black box coatings for reverse engineering and white-balanced, multi-bandpass filters for three-dimensional cinema projection in outdoor environments. Fourteen designers from China, France, Germany, Japan, Russia, and the United States submitted a total of 32 designs for the problems. The design problems and the submitted solutions are described and evaluated.
Article
Optics
Tatiana Amotchkina, Michael Trubetskov, Vesna Janicki, Jordi Sancho-Parramon
Summary: This study proposes a post-production characterization approach based on spectral photometric and ellipsometric data, which is related to a specially prepared set of samples. In-situ measurements of single-layer and multilayer samples were conducted to determine the reliable thicknesses and refractive indices of the final multilayer sample. Different characterization strategies based on in-situ measurements were compared, and the best approach for practical use, when preparation of the sample set is not feasible, was proposed.
Article
Optics
Tatiana Amochkina, Michael Trubetskov
Summary: This study reports the important and interesting results of designing dispersive mirrors (DMs) for the mid-infrared spectral range. The study constructs the permissible domains of the most important design specifications, such as mirror bandwidth and group delay variation. Estimations of the required total coating thickness, thickness of the thickest layer, and expected number of layers are obtained. The results are validated through an analysis of several hundreds of DM design solutions.
Article
Optics
D. Cesar, A. Acharya, J. P. Cryan, A. Kartsev, M. F. Kling, A. M. Lindenberg, C. D. Pemmaraju, A. D. Poletayev, V. S. Yakovlev, A. Marinelli
Summary: In this paper, we demonstrate the usage of the Coulomb field of a highly relativistic electron beam as a broadband pulse for driving ultrafast and strong-field physics. Unlike a solid-state laser, this pulse can be synchronized with an x-ray free electron laser (XFEL) and has a tunable cutoff frequency from THz to extreme ultraviolet (EUV). The excitations generated by this pulse act on target systems as half-cycle impulses, providing unique features for novel science at XFEL facilities such as the Linac Coherent Light Source (LCLS).
Article
Engineering, Multidisciplinary
Franz E. Haniel, Lina Hedewig, Hartmut Schroeder, Matthias F. Kling, Boris Bergues
Summary: Ion microscopy is a well-established technique for laser focus diagnostics and precise measurement of laser ionization processes. This feasibility study presents a new ion microscope design that enhances resolution across a wide range of magnifications and simplifies operation. The proposed design utilizes an array of equally spaced ring electrodes with individually adjustable voltages controlled by an evolutionary algorithm, enabling aberration minimized magnifications between 25 and 100, as well as voltage adjustment for changing experimental conditions and user-defined autofocus.
ENGINEERING RESEARCH EXPRESS
(2023)
Article
Optics
Maximilian F. Seeger, Dominik Kammerer, Johannes Bloechl, Marcel Neuhaus, Vladimir Pervak, Thomas Nubbemeyer, Matthias F. Kling
Summary: We present a mid-infrared optical parametric chirped pulse amplifier (OPCPA) system capable of generating 2.1 μm center wavelength pulses with 20 fs duration and 4.9 mJ energy at 10 kHz repetition rate. The system is based on a kW-class Yb:YAG thin-disk amplifier and incorporates a CEP stable SWIR generation and three consecutive OPCPA stages. With a SWIR source delivering an average power of 49 W and excellent phase and average power stability, the setup enables attosecond pump probe spectroscopy experiments with photon energies in the water window.
Article
Physics, Multidisciplinary
Hirofumi Yanagisawa, Markus Bohn, Hirotaka Kitoh-Nishioka, Florian Goschin, Matthias F. Kling
Summary: Single-molecule electron sources, driven by constant electric fields and about 1 nm in size, exhibit unique emission patterns like crosses or two-leaf patterns. By illuminating these sources with femtosecond light pulses, we discovered highly modulated emission patterns originating from single-molecule molecular orbitals, solving a longstanding question. Our simulations achieved subnanometric optical modulation of an electron source through variations in the molecular orbitals of single molecules.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Weiwei Li, Ahmad Saleh, Manas Sharma, Christian Huenecke, Marek Sierka, Marcel Neuhaus, Lina Hedewig, Boris Bergues, Meshaal Alharbi, Hadi ALQahtani, Abdallah M. Azzeer, Stefanie Graefe, Matthias F. Kling, Abdullah F. Alharbi, Zilong Wang
Summary: The below-threshold harmonic generation in solid-state organic semiconductors is explored, showing that the pi-pi* excitations of the porphyrin ring system generate the harmonic emission. The study also reveals the contribution of Brunel harmonic to the 5th harmonic emission and the role of resonant 5-photon transition in triggering non-perturbative behavior, suggesting similar resonance effects in other organic materials.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Najd Altwaijry, Muhammad Qasim, Mikhail Mamaikin, Johannes Schoetz, Keyhan Golyari, Michael Heynck, Enrico Ridente, Vladislav S. Yakovlev, Nicholas Karpowicz, Matthias F. Kling
Summary: Direct measurements of the electric field of light enable new observations of light-matter interactions. A method for detecting broadband near-infrared fields based on linear absorption in a semiconductor is demonstrated, avoiding complex vacuum setups and working under ambient conditions.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Erfan Saydanzad, Jeffrey Powell, Adam Summers, Seyyed Javad Robatjazi, Carlos Trallero-Herrero, Matthias F. Kling, Artem Rudenko, Uwe Thumm
Summary: In this study, the generation and dynamics of photoelectrons from plasmonic nanostructures under intense laser pulses in the infrared regime were investigated. It was found that the contribution from direct photoemission significantly increased, suggesting the potential for developing compact tunable electron sources.
Article
Nanoscience & Nanotechnology
Philipp Rosenberger, Ritika Dagar, Wenbin Zhang, Arijit Majumdar, Marcel Neuhaus, Matthias Ihme, Boris Bergues, Matthias F. Kling
Summary: Droplets provide a unique platform for investigating laser-induced surface chemistry. This study demonstrates the application of reaction nanoscopy technique to propanediol nanodroplets and reveals the sensitivity of the technique to droplet size, charge, and surface chemistry. The results show enhanced production of methyl cations from 1,2-PDO droplets compared to 1,3-PDO droplets, highlighting the role of surface alignment in chemical reactions on droplets. These findings open up opportunities for spatio-temporal observations of charge dynamics and surface reactions on droplets.
Article
Chemistry, Physical
A. C. LaForge, J. D. Asmussen, B. Bastian, M. Bonanomi, C. Callegari, S. De, M. Di Fraia, L. Gorman, S. Hartweg, S. R. Krishnan, M. F. Kling, D. Mishra, S. Mandal, A. Ngai, N. Pal, O. Plekan, K. C. Prince, P. Rosenberger, E. Aguirre Serrata, F. Stienkemeier, N. Berrah, M. Mudrich
Summary: By using high resolution, time-resolved photoelectron spectroscopy, we have conducted an in-depth study on the ultrafast relaxation processes observed during electronic excitation of helium nanodroplets, revealing relaxation phenomena that were previously unobserved.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
