近日，四川大学的陈自宇及其研究团队取得一项新进展。经过不懈努力，他们实现了贝塞尔-高斯光束弯曲相对论等离子体反射镜的自修复高次谐波产生。相关研究成果已于2024年4月19日在国际知名学术期刊《物理评论A》上发表。

该研究团队借助三维粒子云网格模拟技术，成功揭示了贝塞尔-高斯光束驱动的HHG，在相对论和极端非线性状态下的独特自修复特性。这一特性使得在弯曲等离子体反射镜聚焦后，反射场能够实现二次增强，进而在空间和时间上扩大高强度区域的覆盖范围，有利于在极端场中应用。

据悉，光学弯曲相对论等离子体反射镜高次谐波产生(HHG)的相干聚焦，为实现前所未有的高强度提供了一条有希望的途径，为研究超强场中发生的现象开辟了前景，但其区域仅限于极小的时空尺度。

附：英文原文

Title: Self-healing high-order harmonic generation from curved relativistic plasma mirrors with Bessel-Gaussian beams

Author: Zeyue Pang, Peng Chen, Zi-Yu Chen

Issue&Volume: 2024/04/19

Abstract: Coherent focusing of high-order harmonic generation (HHG) from optically curved relativistic plasma mirrors provides a promising route to achieve unprecedented high intensities, opening up prospects to study phenomena occurring in extremely strong fields, the region of which is however limited within extremely small spatial and temporal scales. Here through three-dimensional particle-in-cell simulations we demonstrate HHG driven by Bessel-Gaussian beams exhibiting the intriguing feature of self-healing up to the relativistic and extreme nonlinear regime. This allows a secondary intensification of reflected fields after the focus of curved plasma mirrors and thus extends the high-intensity region in both space and time, beneficial for extreme field applications.

DOI: 10.1103/PhysRevA.109.043521

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.109.043521