Generation of elliptically polarized attosecond pulse trains from asymmetric planar molecules driven by linearly polarized laser fields

IF 2.8 3区化学 Q3 CHEMISTRY, PHYSICAL

Chemical Physics Letters Pub Date : 2025-07-10 DOI:10.1016/j.cplett.2025.142270

Siyang Wang, Weiwei Yu

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Abstract

Elliptically polarized attosecond pulse generation in the asymmetric planar molecule NH

_{2}

COSH is investigated under linearly polarized laser irradiation, employing time-dependent density functional theory (TDDFT). The results indicate that modulating the carrier-envelope phase (CEP) of the incident laser field can advance the emission time and enhance the intensities of the generated attosecond pulses. Furthermore, sharp transitions in emission time are observed at specific CEP values. Notably, the generated high-order harmonics in parallel and perpendicular polarization directions demonstrate comparable intensities and similar emission time within a certain CEP range. The corresponding high-order harmonic generation (HHG) spectra exhibit high ellipticity (

ɛ

= 0.6), enabling the generation of an elliptically polarized attosecond pulse with a duration of 125 as. This work presents a novel approach to controlling the emission characteristics of attosecond pulses.

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线偏振激光场驱动非对称平面分子产生椭圆偏振阿秒脉冲串

利用时间依赖密度泛函理论（TDDFT）研究了线偏振激光照射下不对称平面分子NH2COSH的椭圆偏振阿秒脉冲产生。结果表明，调制入射激光场的载波包络相位（CEP）可以提前发射时间，增强产生的阿秒脉冲的强度。此外，在特定CEP值下，观测到发射时间的急剧变化。值得注意的是，在一定的CEP范围内，平行极化方向和垂直极化方向产生的高次谐波具有相当的强度和相似的发射时间。相应的高次谐波产生（HHG）光谱具有高椭圆度（η = 0.6），能够产生持续时间为125 as的椭圆极化阿秒脉冲。本文提出了一种控制阿秒脉冲发射特性的新方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Chemical Physics Letters 化学-物理：原子、分子和化学物理

CiteScore

5.70

自引率

3.60%

发文量

798

审稿时长

33 days

期刊介绍： Chemical Physics Letters has an open access mirror journal, Chemical Physics Letters: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Chemical Physics Letters publishes brief reports on molecules, interfaces, condensed phases, nanomaterials and nanostructures, polymers, biomolecular systems, and energy conversion and storage. Criteria for publication are quality, urgency and impact. Further, experimental results reported in the journal have direct relevance for theory, and theoretical developments or non-routine computations relate directly to experiment. Manuscripts must satisfy these criteria and should not be minor extensions of previous work.