Generating a single high-intensity attosecond pulse radiation via the interaction of a Gaussian vortex beam and electrons

Abstract

Ultra-strong and ultra-short laser pulses can accelerate free electrons and generate attosecond radiation pulses. In this paper, circularly polarized Laguerre-Gaussian (LG) vortex light beam (VLB) is used to accelerate the electrons. A single electron with an incident energy of 2.1 MeV has been simulated to interact with LG-VLB with a half-waist beam width of 5λ. Numerical simulations show that the vortex light has a special converging effect on the electrons. The electrons distributed near the center of the spot generate a velocity component with the motion vector toward the center of the spot. Different from conventional activation, the electron radiation field has a non-uniform distribution, and the radiation field close to the concentrated lateral intensity has an even more strong acceleration effect on the electrons. The pulse width of the electron radiation is 2 attoseconds(as) which is much smaller than the pulse generated by using an ordinary intense laser and Gaussian beam. It has an advantage of reducing the intensity of the laser that generates a single attosecond pulse, and its structure is simple and easy to implement, it has more power in probing the electron dynamics process and the phenomenon of atomic transition.