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A high-power electromagnetic source for disabling improvised explosive devices

High Voltage 2024年第2期9卷 403-409页

作者： Laurent Ariztia Njomza Ibrahimi Alexey Zhabin Antoine Silvestre de Ferron Marc Rivaletto Edson Martinod Valérie Bertrand Bucur Novac Laurent Pécastaing Universite de Pau et des Pays de l’Adour E2S UPPASIAMEPauFrance xlim UMR CNRS BriveLimogesFrance CISTEME LimogesFrance Wolfson School of Mechanical Electrical and Manufacturing EngineeringLoughborough UniversityLoughboroughLeicestershireUK

Ultra-wideband(UWB)microwave sources driven by specialised pulsed power generators have experienced a considerable development in the last decade due to their wide domain of new applications such as defence or counter-terrorism *** authors present the main findings of a research dedicated to the development of a pulsed power-driven electromagnetic field source for disabling improvised explosive devices(IED).The pulsed power generator driving the source is a 13-stage compact Marx producing voltage pulses reaching an amplitude of 0.5 MV,with a pulse repetition frequency(PRF)of up to 100 *** generator is coupled to a bipolar pulse forming line,providing bipolar pulses with a dV/dt of around 1.6 MV/*** pulsed power system feeds an array composed of 16 Koshelev-type UWB antennas through an impedance matching *** resulting electromagnetic source is capable to produce pulsed electric fields(PEFs)having a figure-of-merit(FOM)of 1 ***,practical experiments were carried out to study the effects of the PEFs on *** targets used in the present study are M2B type flashbulbs,known to have the same susceptibility as the US army M6 *** configurations of wires(shielded,twisted,etc)with different lengths were used in connecting items inside these *** tests were performed by placing the flashbulbs at different distances to determine the essential parameters(i.e.,amplitude,duration,and frequency range)of the PEFs required to trigger *** overview of the experimental campaign and the main findings are also presented followed by conclusions.

关键词： power bipolar source

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Label-free biosensing with singular-phaseenhanced lateral position shift based on atomically thin plasmonic nanomaterials

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Light(Science & Applications) 2024年第5期13卷 810-822页

作者： Shaodi Zhu Rodolphe Jaffiol Aurelian Crunteanu Cyrille Vézy Sik-To Chan Wu Yuan Ho-Pui Ho Shuwen Zeng Light Nanomaterials&Nanotechnologies(L2n)CNRS-EMR 7004University of Technology of Troyes10000 TroyesFrance. Department of Biomedical Engineering The Chinese University of Hong KongShatinNew TerritoriesHong KongChina xlim Research Institute UMR 7252 CNRS/University of Limoges123Avenue Albert ThomasLimogesFrance

Rapid plasmonic biosensing has attracted wide attention in early disease diagnosis and molecular biology ***,it was still challenging for conventional angle-interrogating plasmonic sensors to obtain higher sensitivity without secondary amplifying labels such as plasmonic *** address this issue,we developed a plasmonic biosensor based on the enhanced lateral position shift by phase *** singularity presents as a sudden phase retardation at the dark point of reflection from resonating plasmonic substrate,leading to a giant position shift on reflected ***,for the first time,the atomically thin layer of Ge2Sb2Te5(GST)on silver nanofilm was demonstrated as a novel phase-response-enhancing plasmonic *** GST layer was not only precisely engineered to singularize phase change but also served as a protective layer for active silver *** new configuration has achieved a record-breaking largest position shift of 439.3μm measured in calibration experiments with an ultra-high sensitivity of 1.72×10^(8)nm RIU−1(refractive index unit).The detection limit was determined to be 6.97×10^(−7)RIU with a 0.12μm position ***,a large figure of merit(FOM)of 4.54×10^(11)μm(RIU∙°)^(−1)was evaluated for such position shift interrogation,enabling the labelfree detection of trace amounts of *** targeted biosensing experiments,the optimized sensor has successfully detected small cytokine biomarkers(TNF-αand IL-6)with the lowest concentration of 1×10^(−16)*** two molecules are the key proinflammatory cancer markers in clinical diagnosis,which cannot be directly screened by current clinical *** further validate the selectivity of our sensing systems,we also measured the affinity of integrin binding to arginylglycylaspartic acid(RGD)peptide(a key protein interaction in cell adhesion)with different Mn2+ion concentrations,ranging from 1 nM to 1 mM.

关键词： diagnosis protective silver

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Benford or Not Benford:A Systematic But Not Always Well-Founded Use of an Elegant Law in Experimental Fields

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Communications in Mathematics and Statistics 2020年第2期8卷 167-201页

作者： Stéphane Blondeau Da Silva xlim-mathis UMR no 7252 CNRS-Universitéde Limoges123Avenue Albert Thomas87060 LimogesFrance

In this paper,we will propose a way to accurately model certain naturally occurring collections of *** this proposed model,the proportion of d as leading digit,d∈[1,9],in data is more likely to follow a law whose probability distribution is determined by a specific upper bound,rather than Benford’s Law,as one might have *** probability distributions fluctuate nevertheless around Benford’s *** peculiar fluctuations have often been observed in the literature in such data sets(where the physical,biological or economical quantities considered are upper bounded).Knowing beforehand the value of this upper bound enables to find,through the developed model,a better adjusted law than Benford’s one.

关键词： Benford’s Law Leading digit Experimental data

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Spatiotemporal mode decomposition of ultrashort pulses in linear and nonlinear graded-index multimode fibers

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Photonics Research 2023年第5期11卷 750-756页

作者： MARIO ZITELLI VINCENT COUDERC MARIO FERRARO FABIO MANGINI PEDRO PARRA-RIVAS YIFAN SUN STEFAN WABNITZ Department of Information Engineering Electronics and TelecommunicationsUniversitàdegli Studi di Roma Sapienza00184 RomeItaly Universitéde Limoges XLIMUMR CNRS 725287060 LimogesFrance CNR-INO Istituto Nazionale di Ottica80078 PozzuoliItaly

We develop a spatiotemporal mode decomposition technique to study the spatial and temporal mode power distribution of ultrashort pulses in long spans of graded-index multimode fiber,for different input laser *** find that the beam mode power content in the dispersive pulse propagation regime can be described by the Bose-Einstein law,as a result of the process of power diffusion from linear and nonlinear mode coupling among nondegenerate mode *** the soliton regime,the output mode power distribution approaches the Rayleigh-Jeans law.

关键词： ultrashort multimode mode

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Multiphoton ionization of standard optical fibers

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Photonics Research 2022年第6期10卷 1394-1400页

作者： M.FERRARO F.MANGINI Y.SUN M.ZITELLI A.NIANG M.C.CROCCO V.FORMOSO R.G.AGOSTINO R.BARBERI A.D.E LUCA A.TONELLO V.COUDERC S.A.BABIN S.WABNITZ Department of Information Engineering Electronics and TelecommunicationsSapienza University of Rome00184 RomeItaly Physics Department and STAR infrastructure University of CalabriaI-87036 Arcavacata di RendeCSItaly Department of Information Engineering University of Brescia25123 BresciaItaly Universitéde Limoges XLIMUMR CNRS 725287060 LimogesFrance Institute of Automation and Electrometry SB RASNovosibirsk 630090Russia Novosibirsk State University Novosibirsk 630090Russia

Atoms ionization by the simultaneous absorption of multiple photons has found applications in fiber optics,where it leads to unique nonlinear *** date,studies of the ionization regime have been limited to gas-filled hollow-core ***,we investigate multiphoton ionization of standard optical fibers,where intense laser pulses ionize the atoms constituting the fiber structure itself,instead of that of the filling *** characterize material modifications produced by optical *** formation affects laser beam dynamics over hours long temporal *** damage features are studied by means of optical microscopy and X-ray *** the framework of glass photonics,our results pave the way for a novel glass waveguide micromachining technique.

关键词： waveguide breakdown fibers

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Sub-50 fs pulses at 2050 nm from a picosecond Ho:YLF laser using a two-stage Kagome-fiber-based compressor

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Photonics Research 2022年第3期10卷 637-645页

作者： Krishna Murari Giovanni Cirmi Hüseyin Cankaya Gregory J.Stein Benoit Debord Frederic Gerome Felix Ritzkosky Fetah Benabid Oliver Muecke Franz X.Kärtner Center for Free Electron Laser Science CFEL Deutsches Elektronen-Synchrotron DESY22607 HamburgGermany Max-Planck Institute for Structure and Dynamics of Matter(MPSD) 22761 HamburgGermany ELI-ALPS ELI-HU Non-Profit Ltd.Szeged H-6728Hungary The Hamburg Center for Ultrafast Imaging&Department of Physics University of Hamburg22761 HamburgGermany GPPMM Group XLIM Research InstituteUMR 7252 CNRSUniversity of LimogesLimogesFrance show less

The high-energy few-cycle mid-infrared laser pulse beyond 2μm is of immense importance for attosecond science and strong-field ***,the limited gain bandwidth of laser crystals such as Ho:YLF and Ho:YAG allows the generation of picosecond(ps)long pulses and,hence,makes it challenging to generate few-cycle pulse at 2μm without utilizing an optical parametric chirped-pulse amplifier(OPCPA).Moreover,the exclusive use of the near-infrared wavelength has limited the generation of wavelengths beyond 4μm(OPCPA).Furthermore,high harmonic generation(HHG)conversion efficiency reduces dramatically when driven by a long-wavelength *** schemes such as multi-color HHG have been proposed to enhance the harmonic ***,it is highly desirable to generate few-cycle to femtosecond pulses from a 2μm laser for driving these ***,we utilize two-stage nonlinear spectral broadening and pulse compression based on the Kagome-type hollow-core photonic crystal fiber(HC-PCF)to compress few-ps pulses to sub-50 fs from a Ho:YLF amplifier at 2μm at 1 kHz repetition *** demonstrate both experimentally and numerically the compression of 3.3 ps at 140μJ pulses to 48 fs at 11μJ with focal intensity reaching 10^(13)W/cm^(***,this system can be used for driving HHG in solids at 2μ*** the first stage,the pulses are spectrally broadened in Kagome fiber and compressed in a silicon-based prism compressor to 285 fs at a pulse energy of 90μ*** the second stage,the 285 fs pulse is self-compressed in air-filled *** fine-tuning of the group delay dispersion(GDD)externally in a 3 mm window,a compressed pulse of 48 fs is *** leads to a 70-fold compression of the ps pulses at 2050 *** further used the sub-50 fs laser pulses to generate white light by focusing the pulse into a thin medium of YAG.

关键词： fiber amplifier compressor

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Hollow-core photonic crystal fibre for high power laser beam delivery

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High Power Laser Science and Engineering 2013年第1期1卷 17-28页

作者： Yingying Wang Meshaal Alharbi Thomas D.Bradley Coralie Fourcade-Dutin Benot Debord Benot Beaudou Frdric Germe Fetah Benabid Gas-phase Photonic Material Group CPPM Physics Department University of Bath GPPMM Group Xlim Research Institute CNRS UMR 7252 University of Limoges Institute of Laser Engineering Beijing University of Technology

We review the use of hollow-core photonic crystal fibre(HC-PCF)for high power laser beam delivery.A comparison of bandgap HC-PCF with Kagome-lattice HC-PCF on the geometry,guidance mechanism,and optical properties shows that the Kagome-type HC-PCF is an ideal host for high power laser beam transportation because of its large core size,low attenuation,broadband transmission,single-mode guidance,low dispersion and the ultra-low optical overlap between the core-guided modes and the silica *** power handling capability of Kagome-type HC-PCF is further experimentally demonstrated by millijoule nanosecond laser spark ignition and^100μJ sub-picosecond laser pulse transportation and compression.

关键词： High power beam delivery hollow-core photonic crystal fibre Kagome-type hollow-core photonic crystal fibre

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Low-loss single-mode hybrid-lattice hollow-core photonic-crystal fibre

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Light(Science & Applications) 2021年第1期10卷 86-97页

作者： Foued Amrani Jonas HOsorio Frederic Delahaye Fabio Giovanardi Luca Vincetti Benoit Debord Frederic Gerome Fetah Benabid GPPMM Group XLIM InstituteCNRS UMR 7252University of LimogesLimoges 87060France GLOphotonics 123 Avenue Albert ThomasLimoges 87060France Department of Engineering MEnzo Ferrari University of Modena and Reggio EmiliaModena 41125Italy

Remarkable recent demonstrations of ultra-low-loss inhibited-coupling(1C)hollow-core photonic-crystal fibres(HCPCFs)established them as serious candidates for next-generation long-haul fibre optics systems.A hindrance to this prospect and also to short-haul applications such as micromachining,where stable and high-quality beam delivery is needed,is the difficulty in designing and fabricating an IC-guiding fibre that combines ultra-low loss,truly robust single-modeness,and polarisation-maintaining *** design solutions proposed to date require a trade-off between low loss and truly ***,we propose a novel IC-HCPCF for achieving low-loss and effective single-mode *** fibre is endowed with a hybrid cladding composed of a Kagome-tubular lattice(HKT).This new concept of a microstructured cladding allows us to significantly reduce the confinement loss and,at the same time,preserve truly robust single-mode *** results show an HKT-IC-HCPCF with a minimum loss of 1.6dB/km at 1050 nm and a higher-order mode extinction ratio as high as 47.0 dB for a 10 m long *** robustness of the fibre single-modeness is tested by moving the fibre and varying the coupling *** design proposed herein opens a new route for the development of HCPCFs that combine robust ultra-low-loss transmission and single-mode beam delivery and provides new insight into IC guidance.

关键词： fibre mode lattice

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Shaping the light amplified in a multimode fiber

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Light(Science & Applications) 2016年第1期5卷 250-258页

作者： Raphael Florentin Vincent Kermene Joel Benoist Agnès Desfarges-Berthelemot Dominique Pagnoux Alain Barthélémy Jean-Pierre Huignard xlim Research Institute Universitéde Limoges-Centre National de la Recherche ScientifiqueUMR 625287060 LimogesFrance Institut Langevin ESPCI-ParisTech75238 ParisFrance

Propagation of light in multimode optical fibers usually gives a spatial and temporal randomization of the transmitted field similar to the propagation through scattering *** still applies when scattering or multimode propagation occurs in gain *** demonstrate that appropriate structuration of the input beam wavefront can shape the light amplified by a rareearth-doped multimode *** of the wavefront was achieved by a deformable mirror in combination with an iterative optimization *** present experimental results and simulations showing the shaping of a single sharp spot at different places in the output cross-section of an ytterbium-doped fiber *** and narrowing of the amplifier far-field pattern was realized as *** the wavefront to shape the amplified light can also serve to improve the effective *** shaping approach still works under gain saturation,showing the robustness of the *** and experiments attest that the shaping is effective even with a highly multimode fiber amplifier carrying up to 127 modes.

关键词： adaptive optics amplification beam shaping complex media multimode optical fiber

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Existence Results for a Class of Periodic Evolution Variational Inequalities

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Chinese Annals of Mathematics,Series B 2007年第6期28卷 629-650页

作者： Samir ADLY Daniel GOELEVEN Michel THRA DMI-xlim UMR-CNRS 6172Université de Limoges123 Avenue A.Thomas87060 Limoges CedexFrance. IREMIA Université de La Réunion97400 Saint-DenisFrance.

在这篇论文，用 Brouwer 拓扑的度，作者为有限变化不平等证明存在结果。这条途径也被用来获得进化的一个类的周期的解决方案的存在变化不平等。

关键词：变分不等式微分包含拓扑学导向功能

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