近日，波兰华沙大学的K. Krajewska及其研究小组与北京大学的彭良友合作并取得一项新进展。经过不懈努力，他们对超越偶极近似的激光辅助辐射复合进行研究。相关研究成果已于2024年10月22日在国际知名学术期刊《物理评论A》上发表。

本文提出一种全面的理论方法，用于描述在强短激光脉冲存在下的电子-离子辐射复合过程，该方法考虑了1/c修正。其关键步骤是基于将描述电子在库仑势和激光场共同作用下的相对论库仑-沃尔科夫解按1/c的幂进行展开。

这样，研究人员就可以追溯到发射辐射光谱中观察到的非偶极效应的起源。因此，正如研究人员在辅助该过程的高频脉冲中所展示的那样，发射辐射的角分布中截止频率的显著扩展和不对称性可归因于电子对激光脉冲的反冲。

此外，研究人员还研究了通过脉冲啁啾来提高产生高能辐射效率的可能性。

附：英文原文

Title: Laser-assisted radiative recombination beyond the dipole approximation

Author: Deeksha Kanti, M. M. Majczak, J. Z. Kamiński, Liang-You Peng, K. Krajewska

Issue&Volume: 2024/10/22

Abstract: A comprehensive theoretical approach to describe the electron-ion radiative recombination in the presence of intense, short laser pulses, which accounts for 1/c corrections, is presented. Its essential step is based on expanding the relativistic Coulomb-Volkov solution describing an electron in a combined Coulomb potential and a laser field in powers of 1/c. In this way, we can trace the origin of nondipole effects observed in the spectrum of emitted radiation. Hence, as we demonstrate for high-frequency pulses assisting the process, a significant extension of the cutoff and asymmetry in angular distributions of the emitted radiation can be attributed to the electron recoil off the laser pulse. In addition, we investigate the possibility of enhancing the efficiency of the generated high-energy radiation by chirping the pulse.

DOI: 10.1103/PhysRevA.110.043112

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.110.043112