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A spectral-dip fingerprint of quantum path interference in high harmonic generation.

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Title: A spectral-dip fingerprint of quantum path interference in high harmonic generation.
Authors: Shu, Zheng1,2 (AUTHOR) zheng_shu@sxu.edu.cn, Wang, Yichen3 (AUTHOR), Zhao, Yiwen3 (AUTHOR), Ma, Jing3 (AUTHOR), Liu, Bodun3 (AUTHOR), Hao, Xiaolei1,2 (AUTHOR), Ma, Ri3 (AUTHOR) rma@jlu.edu.cn, Jing Chen4,5 (AUTHOR) chenjing@ustc.edu.cn
Source: Journal of Physics B: Atomic, Molecular & Optical Physics. 2026, Vol. 59 Issue 12, p1-12. 12p.
Subjects: Quantum interference, Quantum trajectories, Picosecond pulses, Attosecond pulses, Light intensity, Harmonic generation, Argon
Abstract: High harmonic spectroscopy, as a self-referenced attosecond technique, is widely used to probe electronic structure and dynamics in both atoms and polyatomic molecules. In this study, we theoretically and experimentally investigate the high-harmonic spectra of argon at various laser intensities, revealing a distinctive spectral minimum in the near cutoff region. This feature, attributed to the destructive interference between short and long electron trajectories, serves as a spectroscopic fingerprint of quantum path interference. By analyzing the relative contributions and phases of these quantum paths, we demonstrate that the spectral minimum represents a new modulation pattern of quantum path interference with a period of 0.2 × 10 14 W cm − 2 . This provides new insights into the dynamics of electron trajectories and offers a potential diagnostic tool for observing and controlling ultrafast electronic processes in laser-matter interactions. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:High harmonic spectroscopy, as a self-referenced attosecond technique, is widely used to probe electronic structure and dynamics in both atoms and polyatomic molecules. In this study, we theoretically and experimentally investigate the high-harmonic spectra of argon at various laser intensities, revealing a distinctive spectral minimum in the near cutoff region. This feature, attributed to the destructive interference between short and long electron trajectories, serves as a spectroscopic fingerprint of quantum path interference. By analyzing the relative contributions and phases of these quantum paths, we demonstrate that the spectral minimum represents a new modulation pattern of quantum path interference with a period of 0.2 × 10 14 W cm − 2 . This provides new insights into the dynamics of electron trajectories and offers a potential diagnostic tool for observing and controlling ultrafast electronic processes in laser-matter interactions. [ABSTRACT FROM AUTHOR]
ISSN:09534075
DOI:10.1088/1361-6455/ae73ca