218 / 2026-04-13 21:36:27

Experimental Demonstration of Collimated Electron Acceleration drievn by the Laguerre–Gaussian Lasers

direct laser acceleration,,Laguerre–Gaussian Lasers

极端条件下的基础物理 > 辐射与高能粒子产生

We report the first experimental demonstration of directional and collimated electron acceleration in the direct laser acceleration (DLA) regime using a relativistic hollow Laguerre–Gaussian (LG) laser. Electrons are confined within the hollow field distribution along the reflected laser direction, producing a well-defined beam and overcoming the strong divergence characteristic of Gaussian-laser–driven electrons. In particular, the left-circularly polarized LG laser generates a unique longitudinal resonant electric field on the axis, which, combined with transverse confinement, forms a stable acceleration structure. This leads to higher electron energies with improved stability and collimation compared with right-circularly polarized LG cases. The demonstrated LG-laser–driven collimating mechanism extends conventional DLA into a stable and efficient regime, opening opportunities for particle collimation, high-flux particle sources, and coherent radiation generation in relativistic regimes.