OAM effects in relativistic laser plasma interactions  

作　　者：SHI Yin SHEN BaiFei ZHANG XiaoMei WANG WenPeng XU ZhiZhan 

机构地区：[1]State Key Laboratory of High Field Laser Physics,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences

出　　处：《Science Foundation in China》2015年第4期48-68,共21页中国科学基金（英文版）

基　　金：supported by the Ministry of Science and Technology (Grant Nos.2011DFA11300and 2011CB808104);the National Natural Science Foundation of China(Grant Nos.61221064,11125526, 11335013and 11127901)

摘　　要：When a relativistic laser pulse of high photon density interacts with a specially tailored thin foil target,a strong torque is exerted on the resulting spiral-shaped foil plasma,or"light fan".Because of its structure,the latter can gain significant orbital angular momentum(OAM),and the opposite OAM is imparted to the reflected light,creating a twisted relativistic light pulse.Using such a relativistic LaguerreGaussian(LG)laser interaction with a solid foil,we can get intense high order vortex harmonics.Besides that,proton acceleration using LG laser and hollow screw-like drill in plasma using LG laser are studied.All interaction scenarios are demonstrated by particle-in-cell simulation as well as analytical modeling,and should be verifiable in the laboratory.As important characteristics,twisted relativistic light pulse has strong torque and ultra-high OAM density,which may lead to many more new effects.Whenarelativisticlaserpulseofhighphotondensityinteractswithaspeciallytailoredthinfoil target,astrongtorqueisexertedontheresultingspiralＧshapedfoilplasma,or“lightfan”．Becauseofits structure,thelattercangainsignificantorbitalangularmomentum (OAM),andtheoppositeOAMisimＧ partedtothereflectedlight,creatingatwistedrelativisticlightpulse．UsingsucharelativisticLaguerreＧ Gaussian(LG)laserinteractionwithasolidfoil,wecangetintensehighordervortexharmonics．Besides that,protonaccelerationusingLGlaserandhollowscrewＧlikedrillinplasmausingLGlaserarestudied． AllinteractionscenariosaredemonstratedbyparticleＧinＧcellsimulationaswellasanalyticalmodeling,and shouldbeverifiableinthelaboratory．Asimportantcharacteristics,twistedrelativisticlightpulsehas strongtorqueandultraＧhighOAMdensity,whichmayleadtomanymoreneweffects．

关 键 词：Light FAN ORBITAL angular MOMENTUM Laguerre-Gaussian laser Vortex harmonics Proton acceleration 

分 类 号：TN24[电子电信—物理电子学]