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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.
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. Use such a relativistic LaguerreGaussian (LG) laser interaction with a solid foil, we can get intense high order vortex harmonics .esides that, proton acceleration using LG laser and hollow screw-like drill in plasma using LG laser are studied. All connected 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.