Enhanced electron-positron (e−e+) pair production using two obliquely incident lasers interacting with a solid target is investigated through multi-dimensional particle-in-cell (PIC) simulations. Two obliquely incident lasers can strengthen the laser-hole boring effect, which enhances the reflected focusing laser field and the consequent quantum electrodynamics effects. PIC simulations show that by using two 10 PW-scale lasers, a high-yield (3 × 1010) overdense (∼1022 cm−3) positron beam can be generated and laser to pair energy conversion efficiency can be increased up to one percent. Such positron yield is fifty times higher than that produced from a single laser with the same peak power. The robustness of such a scheme is confirmed by numerically studying parametric influences of the oblique incident angle, temporal asynchrony and phase difference between the two lasers. It is found that the temporal asynchrony and the phase difference have minor effects on the pair production. The proposed scheme may provide great potential for high dense pair plasma generation in experiments with coming approachable high power laser facilities.
利用斜入射激光与固体靶相互作用增强电子-正电子（e⁻e⁺）对产生的研究，通过多维粒子模拟（PIC）方法进行了探讨。两束斜入射激光能够增强激光钻孔效应，从而提升反射聚焦激光场及相应的量子电动力学效应。模拟结果表明，采用两束10拍瓦（PW）级激光，可产生高产额（3×10¹⁰）的超稠密（约10²² cm⁻³）正电子束，且激光到正电子的能量转换效率可达百分之一。该正电子产额是同等峰值功率单束激光作用时的五十倍。通过系统研究两束激光的斜入射角、时间失谐及相位差等参数影响，证实了该方案的稳健性。研究发现，时间失谐和相位差对正电子产生的影响较小。该方案有望为未来高功率激光装置上实现高密度正电子等离子体产生提供重要途径。