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High efficiency second harmonic generation of nanojoule-level femtosecond pulses in the visible based on BiBO

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High Power Laser Science and engineering 2019年第1期7卷 82-89页

作者： Mario Galletti Hugo Pires Victor Hariton Celso Paiva Joao Swen Künzel Marco Galimberti Goncalo Figueira golp/instituto de plasmas e fusao nuclear Instituto Superior Técnico Universidade de Lisboa Central Laser Facility Science and Technology Facilities Council Rutherford Appleton Laboratory Harwell Science and Innovation Campus

We demonstrate high efficiency second harmonic generation(SHG) of near infrared femtosecond pulses using a BiB3 O6 crystal in a single-pass tight focusing geometry setup. A frequency doubling efficiency of 63% is achieved, which is,to the best of our knowledge, the highest value ever reported in the femtosecond regime for such low energy(nJ-level)pumping pulses. Theoretical analyses of the pumping scheme focusing waist and the SHG efficiency are performed, by numerically solving the three wave mixing coupled equations in the plane-wave scenario and by running simulations with a commercial full 3 D code. Simulations show a good agreement with the experimental data regarding both the efficiency and the pulse spectral profile. The simulated SHG pulse temporal profile presents the characteristic features of the group velocity mismatch broadening in a ‘thick' crystal.

关键词： nonlinear process second harmonic generation pumping scheme parametric amplification/oscillators high power laser

Ultra-broadband near-infrared NOPAs based on the nonlinear crystals Bi BO and YCOB

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High Power Laser Science and engineering 2020年第3期8卷 6-15页

作者： Mario Galletti Hugo Pires Victor Hariton Joana Alves Pedro Oliveira Marco Galimberti Goncalo Figueira golp/instituto de plasmas e fusao nuclear Instituto Superior TecnicoUniversidade de Lisboa1049-001 LisboaPortugal Central Laser Facility Science and Technology Facilities CouncilRutherford Appleton LaboratoryHarwell Science and Innovation CampusDidcotUK INFN-LNF Via Enrico Fermi 5400044 FrascatiItaly

We evaluate and demonstrate ultra-broadband near-infrared noncollinear optical parametric amplification in two nonlinear crystals,bismuth borate(Bi BO)and yttrium calcium oxyborate(YCOB),which are not commonly used for this *** spectral bandwidth is of the microjoule level;the amplified signal is≥200 nm,capable of supporting sub-10 fs *** results,supported by numerical simulations,show that these crystals have a great potential as nonlinear media in both low-energy,few-cycle systems and high peak power amplifiers for terawatt to petawatt systems based on noncollinear optical parametric chirped pulse amplification(NOPCPA)or a hybrid.

关键词： ultrafast laser high power laser nonlinear optics ultra-broadband noncollinear OPA YCOB and Bi BO nonlinear crystal

Thermal lens analysis in a diode-pumped 10 Hz 100 mJ Yb:YAG amplifier

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High Power Laser Science and engineering 2020年第2期8卷 24-31页

作者： Victor Hariton Celso Paiva Joao Hugo Pires Mario Galletti Goncalo Figueira golp/instituto de plasmas e fusao nuclear Instituto Superior TécnicoUniversidade de LisboaAv.Rovisco Pais1049-001 LisbonPortugal Central Laser Facility Science and Technology Facilities CouncilRutherford Appleton LaboratoryHarwell Science and Innovation CampusDidcot OX110QXUK

We address the power scaling issue in end-pumped laser rod amplifiers by studying,experimentally and numerically,the magnitude of thermal lensing in a high-energy diode-pumped Yb:YAG *** spatio-temporal temperature profile of the gain medium and the focal length of the induced thermal lens are determined *** influence of the repetition rate and pumping power on the temperature distribution is *** measurements covered repetition rates between 1 and 10 Hz and up to 4 kW pumping power.

关键词： diode-pumped lasers high-energy laser amplifiers thermal effects in lasers ytterbium-doped laser media

Ultra-broadband all-OPCPA petawatt facility fully based on LBO

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High Power Laser Science and engineering 2020年第4期8卷 1-16页

作者： Mario Galletti Pedro Oliveira Marco Galimberti Munadi Ahmad Giedre Archipovaite Nicola Booth emerald Dilworth Andy Frackiewicz Trevor Winstone Ian Musgrave Cristina Hernandez-Gomez golp/instituto de plasmas e fusao nuclear Instituto Superior TecnicoUniversidade de Lisboa1049-001 LisboaPortugal Central Laser Facility Science and Technology Facilities CouncilRutherford Appleton LaboratoryHarwell Science and Innovation CampusDidcotUK INFN-LNF Via Enrico Fermi 5400044 FrascatiItaly School of engineering and Physical Sciences Heriot-Watt UniversityEdinburghUK

A petawatt facility fully based on noncollinear optical parametric chirped pulse amplification(NOPCPA)technology,Vulcan OPPeL(Vulcan OPCPA Petawatt Laser),is *** system will be coupled with the existing hybridCPA/OPCPA VULCAN laser system(500 J,500 fs beamline;250 J,ns regime beamline)based on Nd:glass *** pulse duration(20 times shorter)combined with the system design will allow the auxiliary beamline and its secondary sources to be used as probe beams for longer pulses and their interactions with *** newly designed system will be mainly dedicated to electron beam generation,but could also be used to perform a variety of particle acceleration and optical radiation detection experimental *** this communication,we present the entire beamline design discussing the technology choices and the design supported by extensive simulations for each system ***,we present experimental results and details of our commissioned NOPCPA picosecond front end,delivering 1.5 mJ,~180 nm(1/e^(2))of bandwidth compressed to sub-15 fs.

关键词： high-power laser LBO nonlinear crystal nonlinear optics ultra-broadband OPA ultrafast laser

Study of Gas Heating by a Microwave Plasma Torch

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Journal of Modern Physics 2012年第10期3卷 1603-1615页

作者： Katell Gadonna Oliviez Leroy Philippe Leprince Luis Lemos Alves Cazoline Boisse-Laporte instituto de plasmas e fusao nuclear Instituto Superior Técnico Universidade Técnica de Lisboa Lisboa Portugal Laboratoire de Physique des Gaz et des plasmas UMR 8578 CNRS Université Paris-Sud OzsayFrance

Among the different types of microwave plasma torches, the axial injection torch (TIA) has been used for several years to create chemically active species, in applications such as gas analysis, surface processing and gaseous waste treatments. The TIA allows the coupling of microwave energy (2.45 GHz) to a gas injected axially at the nozzle’s exit. The TIA produces non-local thermodynamic equilibrium plasmas with a high luminosity and a maximum density of charged particles at the nozzle’s exit. The present work is dedicated to study the plasma created by a TIA, running at atmospheric pressure. The study involves both experiment and modeling of this torch, in order to maximize the coupling between the microwave power and the plasma and to define the optimum plasma and flow operating conditions for plasma-to-gas heat transfer.

关键词： Microwave Plasma Torch Non-equilibrium Plasma Atmospheric Pressure Thermal Transfer Flow Modeling

Review on TNSA diagnostics and recent developments at SPARC LAB

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High Power Laser Science and engineering 2019年第3期7卷 228-239页

作者： Fabrizio Bisesto Mario Galletti Maria Pia Anania Massimo Ferraro Riccardo Pompili Mordechai Botton elad Schleifer Arie Zigler INFN-LNF Via Enrico Fermi 4000044 FrascatiItaly Central Laser Facility Science and Technology Facilities CouncilRutherford Appleton LaboratoryHarwell Science and Innovation CampusDidcot 0X11 OQXUK golp instituto de plasmas e fusao nuclear Instituto Superior TecnicoUniversidade de LisboaAv.Rovisco Pais 1049-001 LisbonPortugal Racah Institute of Physics Hebrew University91904 JerusalemIsrael

Interaction between high-intensity lasers with solid targets is the key process in a wide range of novel laser-based particle accelerator schemes,as well as electromagnetic radiation *** to all the processes is the generation of femtosecond pulses of relativistic electrons emitted from the targets as forerunners of the later-time principal products of the interaction *** this paper,some diagnostics employed in laser–solid matter interaction experiments related to electrons,protons,ions,electromagnetic pulses(eMPs)and X-rays are ***,we present our experimental study regarding fast electrons and eMPs utilizing a femtosecond-resolution detector previously adopted only in accelerator facilities.

关键词： high power laser laser-plasma interaction pulsed electric field diagnostic ultra-short high-intensity laser pulses

Single-shot electrons and protons time-resolved detection from high-intensity laser–solid matter interactions at SPARC LAB

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High Power Laser Science and engineering 2019年第3期7卷 163-167页

作者： F.Bisesto M.Galletti M.P.Anania M.Ferrario R.Pompili M.Botton A.Zigler F.Consoli M.Salvadori P.Andreoli C.Verona INFN-LNF Via Enrico Fermi 4000044 FrascatiItaly Central Laser Facility Science and Technology Facilities CouncilRutherford Appleton LaboratoryHarwell Science and Innovation CampusDidcot 0X11 OQXUK golp instituto de plasmas e fusao nuclear Instituto Superior TecnicoUniversidade de LisboaAv.Rovisco Pais 1049-001 LisbonPortugal Racah Institute of Physics Hebrew University91904 JerusalemIsrael eNeA department of Fusion and Technologies for nuclear Safety and Security department C.R.FrascatiVia E.Fermi 4500044 FrascatiItaly University of Rome"Tor Vergata" Industrial Engineering DepartmentVia Cracovia 5000133 RomaItaly

Laser–plasma interactions have been studied in detail over the past twenty years,as they show great potential for the next generation of particle *** interaction between an ultra-intense laser and a solid-state target produces a huge amount of particles:electrons and photons(X-rays andγ-rays)at early stages of the process,with protons and ions following *** SPARC LAB Test Facility we have set up two diagnostic lines to perform simultaneous temporally resolved measurements on both electrons and protons.

关键词： electron diagnostics high power laser proton diagnostics single-shot diagnostics time-of-flight detector TNSA

Simultaneous observation of ultrafast electron and proton beams in TNSA

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High Power Laser Science and engineering 2020年第2期8卷 147-152页

作者： Fabrizio Bisesto Mario Galletti Maria Pia Anania Gemma Costa Massimo Ferrario Riccardo Pompili Arie Zigler Fabrizio Consoli Mattia Cipriani Martina Salvadori Claudio Verona INFN-LNF Via Enrico Fermi 5400044 FrascatiItaly Central Laser Facility Science and Technology Facilities CouncilRutherford Appleton LaboratoryHarwell Science and Innovation CampusDidcot OX110QXEngland golp instituto de plasmas e fusao nuclear Instituto Superior TecnicoUniversidade de LisboaAv.Rovisco Pais1049-001 LisbonPortugal Racah Institute of Physics Hebrew University91904 JerusalemIsrael eNeA Fusion and Technologies for nuclear Safety and Security department C.R.FrascatiVia E.Fermi 4500044 FrascatiItaly Universita’di Roma La Sapienza Piazzale Aldo Moro 500185 RomaItaly INRS-eMT VarennesQuebecCanada University of Rome“Tor Vergata” Industrial Engineering DepartmentVia Cracovia 5000133 RomaItaly

The interaction of ultra-intense high-power lasers with solid-state targets has been largely studied for the past 20 years as a future compact proton and ion ***,the huge potential established on the target surface by the escaping electrons provides accelerating gradients of TV/*** process,called target normal sheath acceleration,involves a large number of phenomena and is very difficult to study because of the picosecond scale *** the SPARC LAB Test Facility,the high-power laser FLAMe is employed in experiments with solid targets,aiming to study possible correlations between ballistic fast electrons and accelerated *** detail,we have installed in the interaction chamber two different diagnostics,each one devoted to characterizing one *** first relies on electro-optic sampling,and it has been adopted to completely characterize the ultrafast electron *** the other hand,a time-of-flight detector,based on chemical-vapour-deposited diamond,has allowed us to retrieve the proton energy *** this work,we report preliminary studies about simultaneous temporal resolved measurements of both the first forerunner escaping electrons and the accelerated protons for different laser parameters.

关键词： electro-optic sampling diagnostics high-power laser laser-plasma interaction time-of-flight diagnostics target normal sheath acceleration ultrashort high-intensity laser pulses

Maser radiation from collisionless shocks: application to astrophysical jets

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High Power Laser Science and engineering 2019年第1期7卷 120-127页

作者： D.C.Speirs K.Ronald A.D.R.Phelps M.e.Koepke R.A.Cairns A.Rigby F.Cruz R.M.G.M.Trines R.Bamford B.J.Kellett B.Albertazzi J.e.Cross F.Fraschetti P.Graham P.M.Kozlowski Y.Kuramitsu F.Miniati T.Morita M.Oliver B.Reville Y.Sakawa S.Sarkar C.Spindloe M.Koenig L.O.Silva D.Q.Lamb P.Tzeferacos S.Lebedev G.Gregori R.Bingham department of Physics SUPA University of Strathclyde department of Physics West Virginia University School of Mathematics and Statistics University of St.Andrews department of Physics University of Oxford golp/instituto de plasmas e Fus?u nuclear Instituto Superior T'ecnico Universidade de Lisboa STFC Rutherford Appleton Laboratory Laboratoire pour l’Utilisation de Lasers Intenses UMR7605 CNRS CEA Universit'e Paris VI Ecole Polytechnique departments of Planetary Sciences and Astronomy University of Arizona AWe Aldermaston Reading West Berkshire department of Physics National Central University Institute of Laser engineering Osaka University School of Mathematics and Physics Queen’s University Belfast department of Astronomy and Astrophysics University of Chicago Imperial College London

This paper describes a model of electron energization and cyclotron-maser emission applicable to astrophysical magnetized collisionless shocks. It is motivated by the work of Begelman, ergun and Rees [Astrophys. J. 625, 51(2005)] who argued that the cyclotron-maser instability occurs in localized magnetized collisionless shocks such as those expected in blazar jets. We report on recent research carried out to investigate electron acceleration at collisionless shocks and maser radiation associated with the accelerated electrons. We describe how electrons accelerated by lower-hybrid waves at collisionless shocks generate cyclotron-maser radiation when the accelerated electrons move into regions of stronger magnetic fields. The electrons are accelerated along the magnetic field and magnetically compressed leading to the formation of an electron velocity distribution having a horseshoe shape due to conservation of the electron magnetic moment. Under certain conditions the horseshoe electron velocity distribution function is unstable to the cyclotron-maser instability [Bingham and Cairns, Phys. plasmas 7, 3089(2000); Melrose, Rev. Mod. Plasma Phys. 1, 5(2017)].

关键词： laboratory astrophysics plasma physics particle acceleration plasma-wave instabilities