Experiment and simulation of hot electrons accelerated by resonance absorption

The angular distribution and energy spectrum of the supra-thermal electrons are studied by means of numeric simulation and interactive experiment between ultrashort- and ultra-intense laser and solid target. Results show that most of the supra-thermal electrons emission radiates towards the direction of target normal or around; when the angle of incidence of the laser pulse is 20°, the maximal resonance absorption of the plasma over laser is achieved; the effective temperature of supra-thermal electrons fitted by the energy spectrum is consistent with a scaling law of the resonance absorption mechanism. Suffice it to say that the resonance absorption mechanism is dominating in electrons acceleration when the plasma has a long scale density profile.