A new phenomenon of enhancing the relativistic transparency of overdenseplasmas by the influence of hot-electron refluxing has been found viaparticle-in-cell simulations. When a p-polarized laser pulse, with intensitybelow the self-induced-transparency (SIT) threshold, obliquely irradiates athin overdense plasma, the initially opaque plasma would become transparentafter a time interval which linearly relies on the thickness of the plasma.This phenomenon can be interpreted by the influence of hot-electron refluxing.As the laser intensity is higher than the SIT threshold, the penetrationvelocity of the laser in the plasma is enhanced when the refluxing ispresented. Simulation data with ion motion considered is also consistent withthe assumption that hot-electron refluxing enhances transparency. These resultshave potential applications in laser shaping.
展开▼
