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 ...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.展开更多
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)
文摘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.
