Metrology for sub-Rayleigh-length target positioning in~10^(22)W/cm^(2)laser-plasma experiments  

作　　者：E.A.Vishnyakov A.Sagisaka K.Ogura T.Zh.Esirkepov B.Gonzalez-Izquierdo C.D.Armstrong T.A.Pikuz S.A.Pikuz W.Yan T.M.Jeong S.Singh P.Hadjisolomou O.Finke G.M.Grittani M.Nevrkla C.M.Lazzarini A.Velyhan T.Hayakawa Y.Fukuda J.K.Koga M.Ishino K.Kondo Y.Miyasaka A.Kon M.Nishikino Y.V.Nosach D.Khikhlukha I.P.Tsygvintsev D.Kumar J.Nejdl D.Margarone P.V.Sasorov S.Weber M.Kando H.Kiriyama Y.Kato G.Korn K.Kondo S.V.Bulanov T.Kawachi A.S.Pirozhkov 

机构地区：[1]ELI Beamlines Facility,The Extreme Light Infrastructure ERIC,DolníBrežany,Czech Republic [2]Kansai Institute for Photon Science(KPSI),QST,Kyoto,Japan [3]Central Laser Facility,Rutherford Appleton Laboratory,STFC,Harwell Oxford,Didcot,UK [4]Institute for Open and Transdisciplinary Research Initiatives,Osaka University,Osaka,Japan [5]HB11 Energy Holdings,Freshwater,Australia [6]Key Laboratory for Laser Plasmas(Ministry of Education),School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai,China [7]Collaborative Innovation Center of IFSA,Shanghai Jiao Tong University,Shanghai,China [8]Institute of Plasma Physics ASCR,Prague,Czech Republic [9]FZU-Institute of Physics ASCR,Prague,Czech Republic [10]Czech Technical University in Prague,FNSPE,Prague,Czech Republic [11]Institute of Laser Engineering,Osaka University,Osaka,Japan [12]Institute of Physics,National Academy of Sciences of Ukraine,Kyiv,Ukraine [13]ISTEQ AR,Yerevan,Armenia

出　　处：《High Power Laser Science and Engineering》2024年第3期90-105,共16页高功率激光科学与工程（英文版）

基　　金：financial support from ELI-Beamlines;project Advanced Research using High Intensity Laser Produced Photons and Particles(ADONIS)(Project No.CZ.02.1.01/0.0/0.0/16_019/0000789)from the European Regional Development Fund;QST-IRI;the QST President’s Strategic Grant(Creative Research);JSPS KAKENHI JP17F17811,JP19KK0355,JP19H00669 and JP22H01239;the Czech Ministry of Education;Youth and Sports(CMEYS)for the financial support of the project number LM2023068;partly supported by JSPS KAKENHI Grant No.JP23H01151。

摘　　要：Tight focusing with very small f-numbers is necessary to achieve the highest at-focus irradiances.However,tight focusing imposes strong demands on precise target positioning in-focus to achieve the highest on-target irradiance We describe several near-infrared,visible,ultraviolet and soft and hard X-ray diagnostics employed in a~10^(22)W/cm^(2)laser±plasma experiment.We used nearly 10 J total energy femtosecond laser pulses focused into an approximately1.3-μm focal spot on 5±20μm thick stainless-steel targets.We discuss the applicability of these diagnostics to determine the best in-focus target position with approximately 5μm accuracy(i.e.,around half of the short Rayleigh length)and show that several diagnostics(in particular,3ωreflection and on-axis hard X-rays)can ensure this accuracy.We demonstrated target positioning within several micrometers from the focus,ensuring over 80%of the ideal peak laser intensity on-target.Our approach is relatively fast(it requires 10±20 laser shots)and does not rely on the coincidence of low-power and high-power focal planes.

关 键 词：laser-plasma interaction precise target positioning spectroscopy ultra-high intensity X-rays 

分 类 号：TN249[电子电信—物理电子学] O53[理学—等离子体物理]