Efficient gamma-ray generation by ultra-intense laser pulses obliquely incident on a planar plasma layer

We have carried out numerical simulations of oblique incidence of a laser pulse with an intensity of I = 1.33 × 10²³ W cm^-2 on a planar plasma layer and found the plasma density and the angle of incidence of p-polarised laser pulses that correspond to the highest gamma-ray generation efficiency and high gamma-ray directivity. The shape of the plasma surface has been determined by simulation and conditions have been considered that lead to an increase in generation efficiency.