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Demonstration of laser pulse amplification by stimulated Brillouin scattering

High Power Laser Science and Engineering 2014年第4期 46-51页

作者： E.guillaume K.Humphrey H.Nakamura r.m.g.m.trines r.Heathcote m.galimberti Y.Amano D.Doria g.Hicks E.Higson S.Kar g.Sarri m.Skramic J.Swain K.Tang J.Weston P.Zak E.P.Alves r.A.Fonseca F.Fi ′uza H.Habara K.A.Tanaka r.Bingham m.Borghesi Z.Najmudin L.O.Silva P.A.Norreys Laboratoire d'Optique Appliqu′ee Ecole PolytechniquePalaiseau 91128 France STFC rutherford Appleton Laboratory Didcot Oxon OX11 0QX United Kingdom University of Strathclyde Glasgow G11XQ United Kingdom Blackett Laboratory Imperial College London Prince Consort RoadLondon SW7 2BZ United Kingdom graduate School of Engineering Osaka University Queens University Belfast Belfast BT7 1NN United Kingdom University of Oxford Parks RoadOxford OX1 3PU United Kingdom

The energy transfer by stimulated Brillouin backscatter from a long pump pulse(15 ps) to a short seed pulse(1 ps)has been investigated in a proof-of-principle demonstration experiment. The two pulses were both amplified in different beamlines of a Nd:glass laser system, had a central wavelength of 1054 nm and a spectral bandwidth of 2 nm, and crossed each other in an underdense plasma in a counter-propagating geometry, off-set by 10?. It is shown that the energy transfer and the wavelength of the generated Brillouin peak depend on the plasma density, the intensity of the laser pulses, and the competition between two-plasmon decay and stimulated raman scatter instabilities. The highest obtained energy transfer from pump to probe pulse is 2.5%, at a plasma density of 0.17 ncr, and this energy transfer increases significantly with plasma density. Therefore, our results suggest that much higher efficiencies can be obtained when higher densities(above0.25ncr) are used.

关键词： laser–plasma interactions optical pulse generation and compression stimulated Brillouin and raman scattering ultra-fast optical processes

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Ion source perturbation and control in intense laser plasma interaction

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matter and radiation at Extremes 2020年第4期5卷 47-52页

作者： B.ramakrishna S.Krishnamurthy m.Tayyab S.Bagchi K.makur raoul trines robbie Scott Alex robinson J.A.Chakera Department of Physics Indian Institute of Technology HyderabadKandiSangareddy 502285India Laser Plasma Division Raja Ramanna Centre for Advanced TechnologyIndore 452013India Homi Bhabha National Institute Training School ComplexAnushakti NagarMumbai 400094India Central Laser Facility STFC Rutherford-Appleton LaboratoryDidcot OX110QXUnited Kingdom

We present here experimental results on the optimization of the mega-electronvolt ion source from the target front surface by using relativistic(10^(18)W/cm^(2))interactions with ultra-short laser pulses(50 fs).The source perturbation in the accelerated proton/ion beam was primarily controlled by the addition of a pre-pulse to main pulse contrast *** 2D particle-in-cell simulations agreed well with the observed experimental results for the ion source perturbation and *** work provides insights into ion source perturbations(temporal and spatial)and the need to control them in intense laser–plasma *** results may assist in the efficient guiding of proton/ion beams to the core of fusion fuel or of ions in cancer therapy.

关键词： intense source primarily

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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

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Petawatt and exawatt class lasers worldwide

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High Power Laser Science and Engineering 2019年第3期7卷 168-221页

作者： Colin N.Danson Constantin Haefner Jake Bromage Thomas Butcher Jean-Christophe FChanteloup Enam A.Chowdhury Almantas galvanauskas Leonida A.gizzi Joachim Hein David I.Hillier Nicholas W.Hopps Yoshiaki Kato Efim A.Khazanov ryosuke Kodama georg Korn ruxin Li Yutong Li Jens Limpert Jingui ma Chang Hee Nam David Neely Dimitrios Papadopoulos rory r.Penman Liejia Qian Jorge J.rocca andrey A.Shaykin Craig W.Siders Christopher Spindloe Sándor Szatmári raoul m.g.m.trines Jianqiang Zhu Ping Zhu Jonathan D.Zuegel AWE AldermastonReadingUK OxCHEDS Clarendon LaboratoryDepartment of PhysicsUniversity of OxfordOxfordUK CIFS Blackett LaboratoryImperial CollegeLondonUK NIF&Photon Science Directorate Lawrence Livermore National LaboratoryLivermoreUSA Fraunhofer Institute for Laser Technology(ILT) AachenGermany Chair for Laser Technology LLT RWTH Aachen UniversityAachenGermany University of rochester Laboratory for Laser EnergeticsRochesterUSA Central Laser Facility STFC Rutherford Appleton LaboratoryChiltonDidcotUK LULI CNRSCEASorbonne UniversitesEcole PolytechniqueInstitut Polytechnique de ParisPalaiseauFrance Department of Physics The Ohio State UniversityColumbusUSA Centre for Ultrafast Optical Science University of MichiganAnn ArborUSA Intense Laser Irradiation Laboratory Istituto Nazionale di Ottica(INO)CNRPisaItaly Institute of Optics and Quantum Electronics Friedrich-Schiller-University Jena and Helmholtz InstituteJenaGermany The graduate School for the Creation of New Photonics Industries NishikuHamamatsuJapan Institute of Applied Physics Russian Academy of SciencesNizhny NovgorodRussia Institute of Laser Engineering Osaka UniversitySuitaOsakaJapan ELI-Beamlines Institute of PhysicsCzech Academy of SciencesPragueCzech Republic State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China National Laboratory for Condensed matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Institute for Applied Physics(IAP)at Friedrich-Schiller-University Jena JenaGermany Helmholtz Institute Jena JenaGermany Fraunhofer Institute for Applied Optics and Precision Engineering(IOF) JenaGermany Key Laboratory for Laser Plasma(ministry of Education) School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Centre for relativistic Laser Science(CoreLS) Institute for Basic ScienceDepartment of Physics and Photon ScienceGwangju Institute of Science and Techno

In the 2015 review paper‘Petawatt Class Lasers Worldwide’a comprehensive overview of the current status of highpower facilities of>200 TW was *** was largely based on facility specifications,with some description of their uses,for instance in fundamental ultra-high-intensity interactions,secondary source generation,and inertial confinement fusion(ICF).With the 2018 Nobel Prize in Physics being awarded to Professors Donna Strickland and gerard mourou for the development of the technique of chirped pulse amplification(CPA),which made these lasers possible,we celebrate by providing a comprehensive update of the current status of ultra-high-power lasers and demonstrate how the technology has *** are now in the era of multi-petawatt facilities coming online,with 100 PW lasers being proposed and even under *** addition to this there is a pull towards development of industrial and multi-disciplinary applications,which demands much higher repetition rates,delivering high-average powers with higher efficiencies and the use of alternative wavelengths:mid-Ir *** apart from a comprehensive update of the current global status,we want to look at what technologies are to be deployed to get to these new regimes,and some of the critical issues facing their development.

关键词： exawatt lasers high-power lasers petawatt lasers ultra-high intensity

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