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Vacuum-ultraviolet dispersive wave emission driven by phase-locked pulse pairs in a gas-filled hollow-core fiber: a numerical study

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Abstract

Phase-locked laser pulse pairs are important tools in many advanced spectroscopy researches. This work investigated the propagation dynamics of a few-cycle pulse pair in a gas-filled hollow-core fiber (HCF), aiming at generation of ultrashort pulse pair, tunable in the vacuum ultraviolet (VUV) range through resonant dispersive wave emission. Although separated temporally, the 2nd pulse in the pulse pair sees a thin plasma (pre-plasma) in the wake of the leading pulse. While the pre-plasma generally reduces the 2nd pulse’s VUV conversion efficiency with the increase of electron density, it is found that for wavelengths shorter than 140 nm, the efficiency is largely suppressed, but for longer VUV wavelengths the pre-plasma has small effects. Analysis reveals that the different response to pre-plasma is determined by the magnitude of Kerr effect, instead of the electron density. It is further shown that the suppression of the VUV output can be compensated by increasing the 2nd pulse’s energy depending on the experimental implementations. Other factors that affect the VUV spectral fringes are also analyzed. This work paves the way to achieving unique VUV sources for many cutting-edge researches.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Funding

National Natural Science Foundation of China (NSFC) (61521093, 61925507, 61635012, 11604351), National Key Research and Development Program of China (2017YFE0123700), Program of Shanghai Academic/Technology Research Leader (18XD1404200), Strategic Priority Research Program of the Chinese Academy of Sciences (XDB1603), Major Project Science and Technology Commission of Shanghai Municipality (STCSM) (2017SHZDZX02).

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Authors and Affiliations

  1. State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-intense Laser Science, Shanghai Institute of Optics and Fine Mechanics (SIOM), Chinese Academy of Sciences (CAS), Shanghai, 201800, China

    Ding Wang & Yuxin Leng

Authors
  1. Ding Wang
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  2. Yuxin Leng
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D.W. carried out the simulations, analyzed the data and wrote the main manuscript. Y.L. supervised the project. All authors reviewed the manuscript.

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Correspondence to Ding Wang.

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Wang, D., Leng, Y. Vacuum-ultraviolet dispersive wave emission driven by phase-locked pulse pairs in a gas-filled hollow-core fiber: a numerical study. Appl. Phys. B 130, 30 (2024). https://doi.org/10.1007/s00340-023-08167-9

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