The generation of highly polarized high-energy brilliant γ-rays via laser–plasma interaction is investigated in the quantum radiation-reaction regime. We employ a quantum electrodynamics particle-in-cell code to describe spin-resolved electron dynamics semiclassically and photon emission and polarization quantum mechanically in the local constant field approximation. As an ultrastrong linearly polarized (LP) laser pulse irradiates a near-critical-density (NCD) plasma followed by an ultrathin planar aluminum target, the electrons in the NCD plasma are first accelerated by the driving laser to ultrarelativistic energies and then collide head-on with the laser pulse reflected by the aluminum target, emitting brilliant LP γ-rays via nonlinear Compton scattering with an average polarization of about 70% and energy up to hundreds of MeV. Such γ-rays can be produced with currently achievable laser facilities and will find various applications in high-energy physics and laboratory astrophysics.

中文翻译：

---

通过激光-等离子体相互作用产生高极化高能明亮 γ 射线

在量子辐射反应体系中研究了通过激光-等离子体相互作用产生高极化高能明亮 γ 射线。我们采用量子电动力学粒子细胞代码来半经典地描述自旋分辨电子动力学，并在局部恒定场近似中机械地描述光子发射和极化量子。当超强线性偏振 (LP) 激光脉冲照射近临界密度 (NCD) 等离子体，然后照射超薄平面铝靶时，NCD 等离子体中的电子首先被驱动激光加速至超相对论能量，然后碰撞头部 -通过铝靶反射的激光脉冲，通过非线性康普顿散射发射出明亮的 LP γ 射线，平均偏振度约为 70%，能量高达数百 MeV。