Description
Polarized positrons and gamma rays are pivotal for probing fundamental physics, yet their generation has long been constrained by a fundamental trade-off between yield, polarization, and efficiency. Conventional methods suffer from low yields or significant depolarization, while existing laser-driven approaches typically produce only transversely polarized particles.
This talk presents a unified theoretical framework for modeling spin and polarization dynamics in strong-field QED interactions [1-3]. Building on this foundation, they propose novel all-optical schemes to generate polarized high-brightness gamma-ray sources [3] and spin-polarized positron beams using ultra-intense lasers [1,5]. They works also reveal new polarization physics arising from QED radiative corrections in laser-electron interactions. They demonstrate a method to generate highly polarized GeV gamma-rays and a compact, single-stage scheme producing longitudinally polarized positrons with high yield and polarization. These advanced beams open the way for laboratory-scale investigations of astrophysical radiation mechanisms—such as gamma-ray bursts and black hole jet emissions—by enabling controlled studies of polarization-dependent, high-energy interactions. This work also establishes a practical route toward compact polarized positron sources for next-generation high-energy physics.
[1] Li et al., Phys. Rev. Lett. 125, 044802 (2022);
[2] Li et al., Phys. Rev. Lett. 124, 014801 (2020);
[3] Li et al., Phys. Rev. Lett. 122, 154801 (2019);
[4] Wu et al., Commun Phys 8, 156 (2025);
[5] Qin et al., to be submitted (2025).