Optimal control of redshift of high-order harmonic in two-color laser fields

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications Pub Date : 2025-06-05 DOI:10.1016/j.optcom.2025.132069

Guang-Rui Jia, Hui-Xia Kang, Ze-Hui Liu

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引用次数: 0

Abstract

High-order harmonic generation (HHG) from the polar diatomic molecule HeH²⁺ is investigated by time-dependent Schrödinger equation (TDSE) in the few-cycle two-color laser (TCL) fields. The impact of the phase difference and inhomogeneity of the TCL fields on HHG was elucidated in this paper. The phase difference affects the rising and falling part and the asymmetry of the TCL field to modulate the occurrence of non-adiabatic redshift. The redshift variations with a period of π as the phase difference changes and the redshift amplitude is the largest when the phase difference is 0.5π. The phase difference also affects the recombination of electrons with adjacent ions, the maximum kinetic energies change increases with the increase of phase difference that can make the high-order harmonic spectrum broaden. The inhomogeneity modifies the laser field distribution, inducing observable modulations in the redshift magnitude of high-order harmonics. Crucially, with a fixed phase difference, controlled enhancement of the inhomogeneity within an optimal range significantly amplifies the redshift. We can optimize of redshift tuning in HHG by these adjustments above.

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双色激光场中高次谐波红移的最优控制

利用时间相关Schrödinger方程（TDSE）研究了极性双原子分子HeH2+在少周期双色激光（TCL）场中产生的高次谐波（HHG）。本文阐述了TCL场的相位差和非均匀性对HHG的影响。相位差影响了TCL场的上升和下降部分和不对称性，从而调制了非绝热红移的发生。随着相位差的变化，红移随周期π的变化，当相位差为0.5π时，红移幅度最大。相位差也影响电子与相邻离子的复合，最大动能变化随相位差的增大而增大，使高次谐波谱变宽。这种不均匀性改变了激光场的分布，引起了高次谐波红移幅度的可观测调制。至关重要的是，在固定的相位差下，在最佳范围内控制非均匀性的增强可以显著放大红移。通过以上调整，我们可以优化HHG中的红移调谐。

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

Optics Communications 物理-光学

CiteScore

5.10

自引率

8.30%

发文量

681

审稿时长

38 days

期刊介绍： Optics Communications invites original and timely contributions containing new results in various fields of optics and photonics. The journal considers theoretical and experimental research in areas ranging from the fundamental properties of light to technological applications. Topics covered include classical and quantum optics, optical physics and light-matter interactions, lasers, imaging, guided-wave optics and optical information processing. Manuscripts should offer clear evidence of novelty and significance. Papers concentrating on mathematical and computational issues, with limited connection to optics, are not suitable for publication in the Journal. Similarly, small technical advances, or papers concerned only with engineering applications or issues of materials science fall outside the journal scope.