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High pulse energy CEP-stable few-cycle pulses at high average power: status of the ELI-ALPS HR2 system

High pulse energy CEP-stable few-cycle pulses at high averag...

2020 High Intensity Lasers and High Field Phenomena, HILAS - Part of OSA High-Brightness Sources and Light-Driven Interactions Congress 2020

作者： Hädrich, Steffen Walther, Nico Shestaev, Evgeny Nagy, Tamas Simon, Peter Blumenstein, Andreas Klas, Robert Buldt, Joachim Stark, Henning Breitkopf, Sven Jójárt, Péter Seres, Imre Várallyay, Zoltán Börzsönyi, Ádám Eidam, Tino Limpert, Jens Active Fiber Systems GmbH Ernst-Ruska-Ring 17 Jena07745 Germany Institute of Applied Physics Abbe Center of Photonics Friedrich-Schiller-Universität Jena Albert-Einstein-Str. 15 Jena07745 Germany Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy Max-Born-Straße 2A Berlin12489 Germany Laser-Laboratorium Göttingen e.V. Hans-Adolf-Krebs-Weg 1 Göttingen37077 Germany Helmholtz-Institute Jena Fröbelstieg 3 Jena07743 Germany ELI-ALPS ELI-HU Non-Profit Ltd. Szeged Dugonics tér 13H-6720 Hungary Fraunhofer Institute for Applied Optics and Precision Engineering Albert-Einstein-Str. 7 Jena07745 Germany

Multi-mJ, 10fs pulses at average powers beyond 300W are generated by 30-times compression of the output of an Yb-fiber-CPA in a 6m long stretched capillary. Recent progress on CEP stabilization of this system is prese...

ISBN: (纸本)9781943580736

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Vias in DBC substrates for embedded power modules 10

Vias in DBC substrates for embedded power modules

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10th International Conference on Integrated Power Electronics systems, CIPS 2018

作者： Bach, Hoang Linh Yu, Zechun Letz, Sebastian Bayer, Christoph Friedrich Waltrich, Uwe Schletz, Andreas März, Martin Fraunhofer Institute of Integrated Systems and Device Technology IISB Erlangen Germany University of Erlangen-Nuremberg Chair of Electric Power Engineering Nuremberg Germany

ISBN: (纸本)9783800745401

This paper encompasses an evaluation of five different approaches to produce electrical vias in DBC (Direct Bonded Copper) substrates. The investigated methods of producing vias are based on laser drilling of different via layouts in the DBC substrates. In the next step, a stencil printing, dispensing and mechanical pressing process were tested for filling the via holes. As filling material, copper, silver pastes and copper rivets were used to enable the electrical connection. Before the experiments, electrical simulations have been performed in order to analyse the optimal via layout in the DBC substrates. It could be validated that at high frequency range (1 GHz), the current density distribution improves through the increase of via pitch, via diameter and via numbers. Combined with silver paste as filling material, the electrical characteristics of produced blind-hole vias could be improved compared to the use of copper paste and copper rivets. In conclusion, potential application possibilities for vias in DBC substrate, like three-dimensional power modules, multilayer DBC stacks and chip embedding concepts are discussed. © 2018 VDE VERLAG GMBH ∙ Berlin ∙ Offenbach.

关键词： Copper

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Control of the Hydroquinone/Benzoquinone Redox State in High-Mobility Semiconducting Conjugated Coordination Polymers

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Angewandte Chemie 2024年第20期136卷

作者： Dr. Xing Huang Dr. Yang Li Dr. Shuai Fu Chao Ma Dr. Yang Lu Dr. Mingchao Wang Peng Zhang Ze Li Feng He Dr. Chuanhui Huang Dr. Zhongquan Liao Ye Zou Dr. Shengqiang Zhou Dr. Manfred Helm Dr. Petko St. Petkov Prof. Hai I. Wang Prof. Mischa Bonn Prof. Jian Li Prof. Wei Xu Prof. Renhao Dong Prof. Xinliang Feng Center for Advancing Electronics Dresden (cfaed) Faculty of Chemistry and Food Chemistry Technische Universität Dresden Dresden 01062 Germany Max Planck Institute of Microstructure Physics Halle (Saale) 06120 Germany These authors contributed equally to this work Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Science Beijing 100190 China Max Planck Institute for Polymer Research Mainz 55128 Germany State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical Engineering Nanjing University Nanjing Jiangsu 210023 China Fraunhofer Institute for Ceramic Technologies and Systems (IKTS) Dresden 01109 Germany Institute of Ion Beam Physics and Materials Research Helmholtz-Zentrum Dresden-Rossendorf Dresden 01328 Germany Faculty of Chemistry and Pharmacy University of Sofia Sofia 1164 Bulgaria Nanophotonics Debye Institute for Nanomaterials Science Utrecht University 3584 CC Utrecht The Netherlands Key Laboratory of Colloid and Interface Chemistry of the Ministry of Education School of Chemistry and Chemical Engineering Shandong University Jinan 250100 China

Conjugated coordination polymers (c-CPs) are unique organic–inorganic hybrid semiconductors with intrinsically high electrical conductivity and excellent charge carrier mobility. However, it remains a challenge in tailoring electronic structures, due to the lack of clear guidelines. Here, we develop a strategy wherein controlling the redox state of hydroquinone/benzoquinone (HQ/BQ) ligands allows for the modulation of the electronic structure of c-CPs while maintaining the structural topology. The redox-state control is achieved by reacting the ligand TTHQ (TTHQ=1,2,4,5-tetrathiolhydroquinone) with silver acetate and silver nitrate, yielding Ag 4 TTHQ and Ag 4 TTBQ (TTBQ=1,2,4,5-tetrathiolbenzoquinone), respectively. In spite of sharing the same topology consisting of a two-dimensional Ag−S network and HQ/BQ layer, they exhibit different band gaps (1.5 eV for Ag 4 TTHQ and 0.5 eV for Ag 4 TTBQ) and conductivities (0.4 S/cm for Ag 4 TTHQ and 10 S/cm for Ag 4 TTBQ). DFT calculations reveal that these differences arise from the ligand oxidation state inhibiting energy band formation near the Fermi level in Ag 4 TTHQ. Consequently, Ag 4 TTHQ displays a high Seebeck coefficient of 330 μV/K and a power factor of 10 μW/m ⋅ K 2 , surpassing Ag 4 TTBQ and the other reported silver-based c-CPs. Furthermore, terahertz spectroscopy demonstrates high charge mobilities exceeding 130 cm 2 /V ⋅ s in both Ag 4 TTHQ and Ag 4 TTBQ.

关键词： Conjugated coordination polymers Metal–organic frameworks Opto-electronics Semiconductors Benzoquinone

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High-average-power and high-pulse-energy CEP-stable few-cycle pulses: Status of the ELI-ALPS HR2 laser system

High-average-power and high-pulse-energy CEP-stable few-cycl...

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Advanced Solid State Lasers, ASSL 2020 - Part of Laser Congress, LAC 2020

作者： Hädrich, Steffen Shestaev, Evgeny Walther, Nico Nagy, Tamas Simon, Peter Blumenstein, Andreas Klenke, Arno Klas, Robert Buldt, Joachim Stark, Henning Gebhardt, Martin Breitkopf, Sven Jójárt, Péter Seres, Imre Várallyay, Zoltán Börzsönyi, Ádám Eidam, Tino Limpert, Jens Active Fiber Systems GmbH Ernst-Ruska-Ring 17 Jena07745 Germany Institute of Applied Physics Abbe Center of Photonics Friedrich-Schiller-Universität Jena Albert-Einstein-Str. 15 Jena07745 Germany Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy Max-Born-Straße 2A Berlin12489 Germany Laser-Laboratorium Göttingen e.V. Hans-Adolf-Krebs-Weg 1 Göttingen37077 Germany Helmholtz-Institute Jena Fröbelstieg 3 Jena07743 Germany ELI-ALPS ELI-HU Non-Profit Ltd. Dugonics tér 13 SzegedH-6720 Hungary Fraunhofer Institute for Applied Optics and Precision Engineering Albert-Einstein-Str. 7 Jena07745 Germany

Multi-mJ, 10fs pulses at average powers beyond 300W are generated by compression of of an Yb-fiber-CPA in a 6m long stretched capillary. CEP stabilization of the CPA system yields ~220mrad at 1.1kW of average power. &... 详细信息

ISBN: (纸本)9781557528209

关键词： Laser pulses

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Erratum to: Cold Atmosphere Plasma Modification on Beta-Carotene-Loaded Nanofibers to Enhance Osteogenic Differentiation

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Fibers and Polymers 2022年第10期23卷 2981-2981页

作者： Moradi, Yasamin Atyabi, Seyed Alireza Ghiassadin, Ali Bakhshi, Hadi Irani, Shiva Atyabi, Seyed Mohammad Dadgar, Neda Department of Biology School of Basic Sciences Science and Research Branch Islamic Azad University Tehran Iran Department of Mechanical Engineering University of Tehran Tehran Iran Department of Chemistry Michigan State University East Lansing USA Department of Functional Polymer Systems Fraunhofer Institute for Applied Polymer Research IAP Potsdam Germany Department of Pilot Nanobiotechnology Pasteur Institute of Iran Tehran Iran

The article Cold Atmosphere Plasma Modification on Beta-Carotene-Loaded Nanofibers to Enhance Osteogenic Differentiation, written by Yasamin Moradi, Seyed Alireza Atyabi, Ali Ghiassadin, Hadi Bakhshi, Shiva Irani, Seyed Mohammad Atyabi, and Neda Dadgar, was mistakenly originally published without open access. After publication in Vol.23, No.1, page 18–27 this was corrected and the article was made an open access publication. Therefore, the copyright of the article has been changed to and the article is forthwith distributed under the terms of the Creative Commons Attribution 4.0 International License ( https://***/10.1007/s12221-021-0033-y ), which permits use, duplication, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The original article has been corrected.

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Determining fundamental properties from diffraction: Electric field induced strain and piezoelectric coefficient

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Physical Review B 2019年第17期99卷 174107-174107页

作者： M. Hinterstein K.-Y. Lee S. Esslinger J. Glaum A. J. Studer M. Hoffman M. J. Hoffmann Institute for Applied Materials Karlsruhe Institute of Technology 76131 Karlsruhe Germany School of Materials Science and Engineering UNSW Sydney NSW 2052 Australia Fraunhofer Institute of Ceramic Technologies and Systems 01277 Dresden Germany Material Science and Engineering Norwegian University of Science and Technology 7491 Trondheim Norway Australian Centre for Neutron Science ANSTO Locked Bag 2001 Kirrawee NSW 2232 Australia

Neutron powder diffraction was used in operando to determine the macroscopic strain and piezoelectric coefficient as a function of applied electric field in a technically relevant actuator material. We were able to individually investigate the two coexisting phases in the material and reveal the origin of maximized strain at phase boundaries. Insight into the strain mechanisms gives evidence that, on average, the classic inverse piezoelectric effect does not apply for polycrystalline materials.

关键词： Dielectric properties Electric polarization Ferroelectricity Permittivity Piezoelectricity Solid-solid transformations Structural phase transition Neutron diffraction

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Quantum illumination with multiple entangled photons

arXiv

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arXiv 2020年

作者： Torromé, Ricardo Gallego Bekhti-Winkel, Nadya Ben Knott, Peter Department of Mathematics Faculty of Mathematics Natural Sciences and Information Technologies University of Primorska Koper Slovenia FHR Fraunhofer-Institut für Hochfrequenzphysik und Radartechnik Fraunhoferstr. 20 Wachtberg53343 Germany Radar Systems Engineering Institute of High Frequency Technology RWTH Aachen University Melatener Straße 25 Aachen52074 Germany

In this work, a theoretical generalization of Lloyd's quantum illumination to signal beams described by two entangled photon states is developed. It is shown that the new protocol offers a method to find the range of the target, reduces the size of the required time-bandwidth product to have the same signal to noise ratio than in Lloyd's quantum illumination, has a lower probability of false positive and is resilient against noise and also potentially against losses. However, the generation of the required three photon states for the protocol posses a technical problem for its practical implementation not fully addressed. Recent advances in triple photon generation that can overcome this problem are discussed. Other issues related with the protocol are also considered. Copyright © 2020, The Authors. All rights reserved.

关键词： Quantum entanglement

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Ultra-short-pulse high-average-power megahertz-repetition-rate coherent extreme-ultraviolet light source

arXiv

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arXiv 2020年

作者： Klas, Robert Kirsche, A. Gebhardt, M. Buldt, J. Stark, H. Hädrich, S. Rothhardt, J. Limpert, J. Institute of Applied Physics Abbe Center of Photonics Friedrich‐Schiller‐University Jena Albert‐Einstein‐Str. 15 Jena07745 Germany Helmholtz‐Institute Jena Fröbelstieg 3 Jena07743 Germany Active Fiber Systems GmbH Ernst‐Ruska‐Ring 17 Jena07745 Germany Fraunhofer Institute for Applied Optics and Precision Engineering Albert‐Einstein‐Str. 7 Jena07745 Germany

High harmonic generation (HHG) enables coherent extreme‐ultraviolet (XUV) radiation with ultra‐short pulse duration in a table‐top setup. This has already enabled a plethora of applications. Nearly all of these applications would benefit from a high photon flux to increase the signal‐to‐noise ratio and decrease measurement times. In addition, shortest pulses are desired to investigate fastest dynamics in fields as diverse as physics, biology, chemistry and material sciences. In this work, the up‐to‐date most powerful table‐top XUV source with 12.9 mW in a single harmonic line at 26.5 eV is demonstrated via HHG of a frequency‐doubled and post‐compressed fibre laser. At the same time sub‐6 fs XUV pulse duration allows accessing ultrafast dynamics with an order of magnitude higher photon flux than previously demonstrated. This concept will greatly advance and facilitate applications of XUV radiation in science and technology and enable photon‐hungry ultrafast studies. © 2020, CC BY-NC-ND.

关键词： Ultrashort pulses

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Energetic sub-2-cycle laser with 220 W average power

arXiv

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arXiv 2021年

作者： Hädrich, Steffen Kienel, Marco Müller, Michael Klenke, Arno Rothhardt, Jan Klas, Robert Gottschall, Thomas Eidam, Tino Drozdy, András Jójárt, Péter Várallyay, Zoltán Cormier, Eric Osvay, Károly Tünnermann, Andreas Limpert, Jens Institute of Applied Physics Abbe Center of Photonics Friedrich-Schiller-Universität Jena Albert-Einstein-Straße 15 Jena07745 Germany Helmholtz Institute Jena Fröbelstieg 3 Jena07743 Germany Active Fiber Systems GmbH Wildenbruchstr. 15 Jena07745 Germany ELI-ALPS ELI-HU Non-Profit Ltd. Szeged Dugonics tér 13H-6720 Hungary Université Bordeaux-CNRS-CEA-UMR 5107 CELIA 351 Cours de la Libération TalenceF-33405 France Fraunhofer Institute for Applied Optics and Precision Engineering Albert-Einstein-Straße 7 Jena07745 Germany

Few-cycle lasers are essential for many research areas such as attosecond physics that promises to address fundamental questions in science and technology. Therefore, further advancements are connected to significant progress in the underlying laser technology. Here, two-stage nonlinear compression of a 660 W femtosecond fiber laser system is utilized to achieve unprecedented average power levels of energetic ultrashort or even few-cycle laser pulses. In a first compression step 408 W, 320 µJ, 30fs pulses are achieved, which can be further compressed to 216 W, 170 µJ, 6.3 fs pulses in a second compression stage. This is the highest average power few-cycle laser system presented so far. It is expected to significantly advance the fields of high harmonic generation and attosecond science. © 2016 Optical Society of America under Open Access Publishing Agreement. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved. Copyright © 2021, The Authors. All rights reserved.

关键词： Ultrafast lasers

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A facile spray-pressing synthesis approach for reusable photothermal masks

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iScience 2023年第8期26卷 107286页

作者： Yi Lu Yi-Xuan Liu Yong Wang Robert Oestreich Zi-Yan Xu Wen Zhang Philipp Hügenell Christoph Janiak Xiao-Yu Yang Hoffmann Institute of Advanced Materials Shenzhen Polytechnic 7098 Liuxian Boulevard Nanshan District Shenzhen 518055 China. Institut für Anorganische Chemie und Strukturchemie Heinrich-Heine-Universität Düsseldorf Universitätsstraße 1 40225 Düsseldorf Germany. School of Chemical Engineering and Technology Sun Yat-sen University Zhuhai 519082 China. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing & Shenzhen Research Institute Wuhan University of Technology Wuhan 430070 China. Division Thermal Systems and Buildings Fraunhofer Institute for Solar Energy Systems ISE Heidenhofstraße 2 Freiburg 79110 Germany.

Certain types of face masks are highly efficient in protecting humans from bacterial and viral pathogens, and growing concerns with high safety, low cost, and wide market suitability have accelerated the replacement of reusable face masks with disposable ones during the last decades. However, wearing these masks creates countless problems associated with personnel comfort as well as more significant issues related to the cost of fabrication, the generation of medical waste, and environmental contaminants. In this work, we present a facile spray-pressing technique for the production of P-masks with a potential scale-up prospect by adding a graphene layer on one side of meltblown fabric and a functional layer on the other side. In principle, this technique could be easily integrated into the present automatic mask production process and the masks have self-cleaning and/or self-sterilizing properties when it is exposed to solar or simulated solar irradiation.

关键词： Applied sciences Materials synthesis Nanotechnology fabrication

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