近日，俄罗斯圣彼得堡国立大学的L. N. Labzowsky及其研究团队取得一项新进展。经过不懈努力，他们提出快粒子穿过激光束渡越时间问题的模型描述。相关研究成果已于2024年6月21日在国际知名学术期刊《物理评论A》上发表。

该研究团队给出了原子穿过激光束时光谱线展宽的模型描述。研究人员考虑了渡越时间展宽、自然展宽和横向多普勒展宽的综合效应。为实现这一目的，研究人员引入了原子-激光相互作用的单参数绝热阻尼机制，该机制模拟了粒子在特定时间窗口内与激光的相互作用。

研究人员采用最简单的矩形光强分布。计算了不同失谐的吸收概率对输运时间的依赖关系，并与先前的结果进行了比较。此外，他们还建立了用洛伦兹谱线描述快粒子与激光束相互作用的极限。

附：英文原文

Title: Model description of the transit-time problem for fast particles crossing a laser beam

Author: S. D. Chekhovskoi, L. N. Labzowsky

Issue&Volume: 2024/06/21

Abstract: The model description of the spectral line broadening for atoms crossing the laser beams is presented. The combined effect of the transit-time broadening, natural broadening, and transverse Doppler broadening is considered. This is done by introducing one-parametric adiabatic damping of atom-laser interaction where the particles interact with the laser during a finite time interval. The simplest rectangle distribution of the light intensity inside the laser beam is employed. The dependence of absorption probability on the transit time for different detunings is calculated and compared with earlier results. The limits for using the Lorentz line profile for describing the interaction of fast particles with laser beams are established.

DOI: 10.1103/PhysRevA.109.062811

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.109.062811